Alternatives to Procurement Service Bus (PSB)
Compare Procurement Service Bus (PSB) alternatives for your business or organization using the curated list below. SourceForge ranks the best alternatives to Procurement Service Bus (PSB) in 2026. Compare features, ratings, user reviews, pricing, and more from Procurement Service Bus (PSB) competitors and alternatives in order to make an informed decision for your business.
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1
Blackbird API Development
Ambassador
Accelerate Development of Prod-Ready APIs. AI-Powered Code Gen, Mocking in Minutes, and On-Demand Ephemeral Test Environments. * Design Efficiently: Generate standardized OpenAPI specs with AI assistance, allowing you to begin coding faster. * Mock Effortlessly: Create shareable API mocks without manual coding, enabling rapid validation. * Automate Repetitive Tasks: Utilize AI to automatically generate boilerplate code for both client and server-side APIs. * Test Effectively: Access publicly available URLs for testing in a production-like test environment through Blackbird's ephemeral testing environments. * Debug Seamlessly: Set breakpoints and debug directly from your preferred IDE with Blackbird's integrated debugging tools. * Deploy Smoothly: Utilize a 24/7 hosted environment for progressive and repeated testing without reconfiguration, facilitated by Blackbird's containerized deployment.Starting Price: $69/month -
2
Storecove
Storecove
Send & receive e-invoices with PEPPOL. Safely send to international governments. For ERP: Connect your software to Peppol with an easy RESTful API. Why E-invoicing? - The costs of sending e-invoices is 59% cheaper and receiving costs are reduced by 64%. - Paper invoicing requires paper filing, retention and storage space, which costs time and money. E-invoices are send from bookkeeping system to bookkeeping system, fully in the cloud without physical interference. - You can no longer send PDF or paper invoices to governments, ministries or public entities. With Peppol you can send your e-invoices to governments worldwide, all according to the newly established European Directive. Are you an ERP system / accounting software? You can enable e-invoicing for your own customers using an easy RESTful API. Customers can then send & receive e-invoices from within your own software, easily connect to the Peppol network and send e-invoices to governmentStarting Price: €495 / mo -
3
Qdrant
Qdrant
Qdrant is a vector similarity engine & vector database. It deploys as an API service providing search for the nearest high-dimensional vectors. With Qdrant, embeddings or neural network encoders can be turned into full-fledged applications for matching, searching, recommending, and much more! Provides the OpenAPI v3 specification to generate a client library in almost any programming language. Alternatively utilise ready-made client for Python or other programming languages with additional functionality. Implement a unique custom modification of the HNSW algorithm for Approximate Nearest Neighbor Search. Search with a State-of-the-Art speed and apply search filters without compromising on results. Support additional payload associated with vectors. Not only stores payload but also allows filter results based on payload values. -
4
Swagger
SmartBear
Simplify API development for users, teams, and enterprises with the Swagger open source and professional toolset. Find out how Swagger can help you design and document your APIs at scale. The power of Swagger tools starts with the OpenAPI Specification — the industry standard for RESTful API design. Individual tools to create, update and share OpenAPI definitions with consumers. SwaggerHub is the platform solution to support OpenAPI workflows at scale. Swagger open source and pro tools have helped millions of API developers, teams, and organizations deliver great APIs. Swagger offers the most powerful and easiest to use tools to take full advantage of the OpenAPI Specification. -
5
MetaMate
MetaMate
MetaMate is an open source semantic service bus that provides a unified API for accessing diverse data sources, including APIs, blockchains, websites, and peer-to-peer networks. By mapping vendor-specific data representations onto an abstract schema graph, MetaMate enables seamless interaction with various services. Its community-driven approach allows contributors to add new types and fields, ensuring the system evolves with real-world data. The platform's type system is derived from widely adopted data transmission technologies such as GraphQL, gRPC, Thrift, and OpenAPI, facilitating compatibility across different protocols. MetaMate enforces backward compatibility programmatically, ensuring that services and applications built on it remain functional over time. Additionally, its command-line interface can generate slim, typed SDKs tailored to specific project needs, covering only the desired subset of the overall schema graph.Starting Price: Free -
6
NSwag
Rico Suter
NSwag is a comprehensive Swagger/OpenAPI 2.0 and 3.0 toolchain for .NET, .NET Core, ASP.NET Core, and TypeScript, written in C#. It enables developers to generate OpenAPI specifications from existing API controllers and create client code from these specifications. NSwag combines functionalities similar to Swashbuckle (for OpenAPI/Swagger generation) and AutoRest (for client generation) into a single toolchain, eliminating the need for both. Key features include the ability to generate Swagger 2.0 and OpenAPI 3.0 specifications from C# ASP.NET (Core) controllers, serve these specifications via ASP.NET (Core) middleware with integrated Swagger UI or ReDoc, and generate C# or TypeScript clients/proxies from the specifications. NSwag offers multiple usage methods, including a user-friendly Windows GUI (NSwagStudio), command-line interfaces compatible with Windows, Mac, and Linux, and integration into C# code via NuGet packages.Starting Price: Free -
7
OpenAPI Generator
OpenAPI Generator
OpenAPI Generator is an open-source tool that automatically generates client libraries, server stubs, API documentation, and configuration files from an OpenAPI Specification (OAS) document. It supports a wide range of programming languages and frameworks, making it easier for developers to integrate APIs into their applications. By automating the creation of boilerplate code, OpenAPI Generator reduces development time and ensures consistency in API interactions. It allows teams to focus on implementing business logic rather than dealing with repetitive tasks like data serialization, deserialization, and HTTP request handling. The tool is widely used in API-driven development, enabling seamless integration of third-party services and simplifying the process of keeping API consumers and providers in sync.Starting Price: Free -
8
Swagger Codegen
SmartBear
Swagger Codegen can simplify your build process by generating server stubs and client SDKs for any API, defined with the OpenAPI (formerly known as Swagger) specification, so your team can focus better on your API’s implementation and adoption. Moving from design to development has never been easier with Swagger Codegen in SwaggerHub. API Definition files can be used to create stubs in popular languages, like Java, Scala, and Ruby, with just a few clicks.Starting Price: Free -
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Continia Document Capture
Continia
Continia Document Capture automates the entire accounts payable workflow within Microsoft Dynamics 365 Business Central by using intelligent OCR to extract invoice and credit memo data directly into the correct fields, reducing manual entry and errors. It features automatic three-way order matching with configurable variance tolerances to approve invoices without intervention, purchase-contract oversight to ensure accurate billing against subscriptions and agreements, and a secure, audit-proof archive that indexes original PDF and XML documents for instant retrieval. Automated setup and batch processing streamline onboarding, while fraud checks validate critical fields (such as bank details) to prevent unauthorized changes. It handles all common e-document formats (PEPPOL, UBL, XRechnung, and more), integrates with the Peppol eDelivery Network for compliant document exchange, and provides dedicated email addresses for direct vendor submissions. -
10
Gentoro
Gentoro
Gentoro is a platform built to empower enterprises to adopt agentic automation by bridging AI agents with real-world systems securely and at scale. It uses the Model Context Protocol (MCP) as its foundation, allowing developers to automatically convert OpenAPI specs or backend endpoints into production-ready MCP Tools, without writing custom integration code. Gentoro takes care of runtime concerns like logging, retries, monitoring, and cost optimization, while enforcing secure access, auditability, and governance policies (e.g., OAuth support, policy enforcement) whether deployed in a private cloud or on-premises. It is model- and framework-agnostic, meaning it supports integration with various LLMs and agent architectures. Gentoro helps avoid vendor lock-in and simplifies tool orchestration in enterprise environments by managing tool generation, runtime, security, and maintenance in one stack. -
11
SOAPSonar
Crosscheck Networks
Validate the functional behavior of APIs with client input simulations. Success criteria rules provide validation and regression testing of API behavior. Tests can be run on-demand or automated. Supports latest OpenAPI standards for automatically parsing OpenAPI documents and building test cases for all of the defined operations. Test authentication schemes including OAuth, SAML, PKI, Basic Auth, Amazon Auth, and Kerberos. Verify SSO tokens and cookies. Create behavior baselines and run regression tests to determine if any breakage or change of behavior occurs. Includes JSON and XML Diff capability. Test encryption and decryption of JSON, XML, REST, and SOAP message patterns. Simulate load from multiple virtual clients to measure and validate the performance criteria of the target APIs. Dynamic security and identity provide real world simulated inputs. Built-in support for AWSv4 signatures to authenticate to and test Amazon AWS APIs.Starting Price: $80/month -
12
RepreZen API Studio
RepreZen
Build APIs that click with client apps. RepreZen API Studio is an integrated workbench that brings API-first design into focus for your whole team, harmonizes your API designs, and generates APIs that click into client apps. Effortlessly. Full-featured OpenAPI editor with content assist, customizable templates, outline navigation & more for fast, focused API design. Live documentation view gives you immediate clarity & insight from the API user's perspective. Interactive diagram lets you visualize the API as you design. Generate & view in any browser to give API users a fast, intuitive overview. Split a large Swagger API spec into multiple files, even share & reuse API components across projects & teams! Edit, navigate, document & generate, all fully compliant with OpenAPI standards. Consolidate & simplify complex multi-file projects to a single file, for easy downstream code generation & docs presentation.Starting Price: $22 per month -
13
AutoRest
Microsoft
The AutoRest tool generates client libraries for accessing RESTful web services. Input to AutoRest is a spec that describes the REST API using the OpenAPI specification format and streamlines the creation of client code across multiple programming languages, including C#, Java, Python, TypeScript, and Go. This automation enhances consistency and efficiency in API consumption, reducing the manual effort required to develop and maintain client libraries. AutoRest operates through a flexible pipeline that processes OpenAPI input files, transforming them into a code model which is then utilized by language-specific generators to produce client code adhering to each language's design guidelines. The tool supports both OpenAPI 2.0 and 3.0 specifications, ensuring compatibility with a wide range of APIs. Developers can install AutoRest on Windows, macOS, or Linux systems, with installation facilitated via Node.js.Starting Price: Free -
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Zuplo
Zuplo
We’re reinventing API & MCP management for everybody, from startups to enterprises. Add authentication, analytics, rate-limiting, and developer documentation to your APIs and MCP servers in minutes. Protect your API by adding rate-limiting with Zuplo in minutes, and add over 50 available plugins like authentication to your API with a single click. Zuplo was built on the edge and deployed to +300 data centers in the world, which makes multi-cloud deployments first-class. With Zuplo you can run different workloads in different clouds while enforcing a unified set of security policies. Zuplo is the only API gateway that runs your OpenAPI spec directly. Leverage the OpenAPI ecosystem to build your API, and then deploy it to Zuplo without additional configuration. Zuplo automatically generates beautiful docs for your API. You can customize the docs with markdown and devs can self-serve API Keys directly from your docs. You can also directly generate hosted MCP servers from your OpenAPI.Starting Price: $0 per month -
15
e-invoice
e-invoice.be
The e‑Invoice Peppol API helps software platforms, finance tools, and SaaS companies instantly support Peppol e‑invoicing without the complexity of XML, UBL parsing, or running your own Access Point. Convert PDFs, Word or Excel invoices into valid e‑invoices. Deliver e‑invoices via the Peppol network—fast. Features include: - developer friendly REST API - PDF/Word/Excel → UBL conversion - IBAN validation & automatic KYC onboarding - Real-time webhook notifications - Secure UBL document delivery over Peppol Usage-based pricing with full control and zero infrastructure headaches. Built for developers who want compliance without complexity. -
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create-api.dev
Kong
Create-API.dev is an AI-powered OpenAPI specification builder by Kong that lets you generate high-quality API specs in seconds through a simple chat interface. By messaging the service, you provide your desired endpoints or rough outline, and an underlying Google LLM crafts complete, standards-compliant OpenAPI definitions that are ready to share, test, and ship. As a lightweight, web-based tool, it requires no installation. The generated specs can be exported in standard YAML or JSON formats for seamless integration with your existing API gateways and documentation pipelines. Create-API.dev operates under Google’s Generative AI Prohibited Use Policy and advises discretion before relying on or publishing any AI-generated content.Starting Price: Free -
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42Crunch
42Crunch
Your most valuable intelligence isn’t AI, it’s your developers. Empower them with tools to be the driving force behind API security – ensuring continuous, unparalleled protection across the entire API lifecycle. Push your OpenAPI definition to your CI/CD pipeline and automatically audit, scan and protect your API. Audit your OpenAPI / Swagger file against 300+ security vulnerabilities, we’ll rank them by severity level and tell you exactly how to fix them – making security a seamless part of your development lifecycle Enforce a zero-trust architecture by ensuring all your APIs meet a set security standard before production, scan the live API endpoints for potential vulnerabilities, and automate redeployment. Ensure security of all your APIs from design to deployment, get detailed insight about attacks on APIs in production – and protect against threats – without impacting performance. -
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OpusCapita
OpusCapita
Invoice and order exchange, invoice automation, and procurement solutions for an efficient B2B flow. Service provider and network operator in one, OpusCapita is a leading European provider of cloud-based solutions that help businesses manage their procurement, supply chain, accounts payable and accounts receivable processes - for lower costs and better compliance and control. Our expanding Business Network connects you to all your B2B trading partners via single connection both on the supply and purchasing sides. Our network interoperability covers, in addition to the OpusCapita network, EDI direct connections, other service providers, invoice-key in and PO flip for small suppliers, as well as PEPPOL orders, invoices, and more. Our sell-side solutions cover order-to-cash messaging and invoice sending via all channels and formats. Our buy-side solutions cover procurement, purchase-to-pay messaging, invoice receiving, and AP automation for invoice handling, PO matching and more. -
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SuperCore
SuperCore
The next-gen core banking platform for ambitious banks. SuperCore® is our cloud-native core banking platform. It helps banks understand their customers better, release products faster, unlock their data, and deliver connected experiences. As a SaaS-managed service for core banking, SuperCore is available globally via AWS and simplifies your deployment, integration, and infrastructure operations. As a result, banks can massively reduce their cost to serve. Build products in minutes with our no-code product builder. Use our real-time events stream to get fresh customer insights that speed up decision-making. Seamlessly integrate your channels and applications with our API-first architecture. A flexible microservices architecture, modular and configurable, powered by a unified data model. Futureproof your technology with a layer of SmartAdapters in JavaScript with OpenAPI Swagger documentation. With pre-built integrations and modules that get you live faster. -
20
Konfig
Konfig
Konfig is a developer tool that automates the generation of SDKs, documentation, demos, and tutorials for REST APIs, facilitating seamless onboarding for external developers. By importing an OpenAPI Specification or Postman Collection, Konfig automatically produces SDKs in popular programming languages, including TypeScript, Python, Java, C#, PHP, Ruby, Go, Swift, and Dart. The platform ensures high-quality SDKs by identifying and rectifying errors in the OpenAPI Specification through its linter and writing test cases to prevent API updates from breaking existing SDKs. Konfig also generates branded, user-friendly documentation that auto-updates with any changes to the API specification, maintaining consistency between documentation and SDKs. Additionally, it allows for the creation of engaging demos and tutorials using familiar Markdown, enabling users to run code in-browser for hands-on learning. -
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Security product companies have huge need to build connectors with third party applications. This need is driven by multiple factors such as Customer requirement, enhance product capabilities etc. Target systems can be present on cloud, on-premise, hybrid environment. Complexities are added in terms of the varied options offered by Target systems such as interfaces available to integrate (REST API, SOAP, SFTP, Message Queue, SNMP, SDKs etc.). Data types (JSON, Syslog, File system, XML, etc.). Authentication and authorization options (OAuth, API Token, Username/Password, OTP, MFA, SAML, etc.). Rate limit, pagination, latency, concurrency, and data volume. Security Product Companies end up writing customized, non-standardized Connectors for these Target systems. This leads not only to increased development and support cost but also less efficient Connectors in terms of performance, scalability and extensibility.
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22
Insomnia
Kong
Design, debug, and test APIs like a human, not a robot. Finally, a workflow you'll love. The Collaborative API Design Tool for designing, testing and managing OpenAPI specifications. The Desktop API client for REST and GraphQL. Make requests, inspect responses. Quickly create and group requests, specify environment variables, authentication, generate code snippets, and more. Get all the details on responses. View the whole request timeline, status codes, body, headers, cookies, and more. Create workspaces, folders, environments, drag-and-drop requests, and easily import and export your data. Create, edit, lint, debug, preview, and manage all of your OpenAPI specs in one collaborative API design editor. Generate configuration for common API gateways such as the Kong API Gateway, and Kong for Kubernetes. Sync your API designs with source control such as Github / Gitlab, and deploy directly to API Gateways such as Kong with one click.Starting Price: $5 per month -
23
Yandex API Gateway
Yandex
Requests to service APIs are processed with minimum delay. Under peak loads, the service is automatically scaled to minimize response latency. You can use Certificate Manager domains when accessing the API. In this case, a certificate linked to the domain is used to provide a TLS connection. Extend specifications with a click in the management console and integrate your applications with Yandex Cloud services. Canary releases in API Gateway allow you to apply changes to the OpenAPI specifications of the API gateway gradually, to a portion of incoming queries. Limit the number of queries to the API gateway per unit of time to defend against DDoS attacks and control consumption of cloud resources. -
24
SwaggerHub
SmartBear
SwaggerHub is an integrated API design and documentation platform, built for teams to drive consistency and discipline across the API development workflow. Accelerate your team’s design process without any loss in quality or organizational style consistency with a powerful Editor that’s fully compliant with the latest Swagger (OpenAPI) standards. A Powerful Editor equipped with smart error feedback and syntax auto-completion. Style Validators for ensuring design consistency across multiple APIs. API Mocking to virtualize operations without any code. Domains for storing, reusing and referencing common OAS syntax across multiple APIs. Have your API design and development centralized on a single location, allowing your teams to seamlessly collaborate on new APIs, or discover existing APIs on a centralized platform. Coordinate your entire API lifecycle from a central internal repository, hosted on the cloud.Starting Price: $90 per month -
25
Amadeus Digital Commerce
Amadeus
Increase your digital sales by offering your customers a smooth booking experience, across different touchpoints and devices. Our user-friendly API offers you the flexibility and functionalities to build best in class front-ends with a fast time-to-market. Adapt quickly to customer demand using the tools, data models, and open technology offered by Amadeus Digital Commerce and the digital developer toolkit, part of the Amadeus Digital Experience suite. Tap into wider UI development resources thanks to open technology. Amadeus’ Digital Commerce API follows the industry-standard OpenAPI specifications (Swagger) model and is based on RESTful technology and the JSON data format. Achieve quick adoption from your developers and reduce UI development costs, with a data model that is easy-to-use and requires no specialist PSS knowledge. Achieve higher conversion rates and increase brand loyalty thanks to the smooth booking process and differentiation capabilities. -
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Alibaba Cloud EventBridge
Alibaba Cloud
EventBridge is a serverless event bus service that connects to Alibaba Cloud services, custom applications, and SaaS applications as a centralized hub. EventBridge can also use the CloudEvents 1.0 specification to route events among these services and applications. EventBridge helps you build loosely coupled and distributed event-driven architectures. Provides comprehensive event rule management, including creating, updating, and querying event rules, and enabling or disabling these rules. Supports an ever-growing range of events from Alibaba Cloud services. Region-specific, cross-zone distributed cluster deployment provides powerful disaster recovery capabilities and delivers up to 99.95% service availability. Provides event governance capabilities and supports event flow control, event replay, and event retry policies. -
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NServiceBus
Particular Software
The most developer-friendly service bus for .NET. More than 50,000 developers rely on NServiceBus every day. Backed by a rock-solid distributed development methodology, a worldwide community of experts, consultants and contributors, NServiceBus offers enterprise-grade scalability and reliability for your workflows and integrations without any messy XML configuration - just pure-code bliss. NServiceBus highlights High performance and scalability, Extensively used in many mission-critical systems, business domains and usage scenarios. NServiceBus scalability and performance capabilities are battle-tested and ready for the toughest assignments. Reliable integration with automatic retries. Reliable by default, with built-in configurable mechanisms to retry on failure using messaging best practices and lessons learned from thousands of production usage scenarios. Workflow and background task scheduling. -
28
DapperDox
DapperDox
DapperDox is open source, and provides rich, out-of-the-box, rendering of your OpenAPI specifications, seamlessly combined with your GitHub flavoured Markdown documentation, guides, and diagrams. Publish your API Swagger specifications like never before. Document multiple API specifications as a suite of products, and cross-reference as required. The built-in API explorer enables API experimentation from within the documentation pages, and can seamlessly integrate into your authentication and API key model. DapperDox can proxy your developer platform, allowing full integration of API key generation and management alongside your specifications and guides. Change themes and present your documentation in the style you like. DapperDox was created by API documentation authors for one purpose, to improve the quality and usability of the API documentation they were providing for other developers.Starting Price: Free -
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ATA
ATA
ATA is an AI-powered API management platform that centralizes design, testing, governance, documentation, and lifecycle workflows into a single intelligent workspace to help teams design, build, test, maintain, and govern APIs with higher quality and collaboration. It keeps API code, design documentation, specifications, test cases, and release notes in sync, reducing manual effort and drift while supporting OpenAPI specs, mock servers for frontend progress without backend readiness, and scheduled API monitoring to detect slow responses, timeouts, or failures early. It includes a Developer Studio for design-first OpenAPI creation and version control, E2E Test Automation with AI-generated robustness and security tests, mock servers, chained API workflows, and UI automation testing, and a Documentation Portal that centralizes API docs with multi-editor support, version management, secure access control, and auto-linked live endpoints. -
30
tap
Digital Society
Turn spreadsheets and data files into production-ready APIs without writing backend code. Upload CSV, JSONL, Parquet and other formats, clean and join them with familiar SQL, and expose secure, documented endpoints instantly. Built-in features include auto-generated OpenAPI docs, API key security, geospatial filters with H3 indexing, usage monitoring, and high-performance queries. You can also download transformed datasets anytime to avoid vendor lock-in. Works for single files, combined datasets, or public data portals with minimal setup. Key features - Create secure, documented APIs directly from CSV, JSONL, and Parquet. - Run familiar SQL queries to clean, join, and enrich data. - No backend setup or servers to configure or maintain. - Auto-generated OpenAPI documentation for every endpoint you create. - Secure endpoints with API keys and isolated storage for safety. - Geospatial filters, H3 indexing, and fast, optimised queries at scale.Starting Price: $10/month -
31
Apache Synapse
Apache Software Foundation
Apache Synapse is a lightweight and high-performance Enterprise Service Bus (ESB). Powered by a fast and asynchronous mediation engine, Apache Synapse provides exceptional support for XML, Web Services and REST. In addition to XML and SOAP, Apache Synapse supports several other content interchange formats, such as plain text, binary, Hessian and JSON. The wide range of transport adapters available for Synapse, enables it to communicate over many application and transport layer protocols. As of now, Apache Synapse supports HTTP/S, Mail (POP3, IMAP, SMTP), JMS, TCP, UDP, VFS, SMS, XMPP and FIX. High-performing PassThrough HTTP transport support for all mediation scenarios. Ultra-fast, low latency mediation of HTTP requests. Supporting a very large number of inbound (client -> ESB) and outbound (ESB -> server) connections concurrently. Intelligently handle message content and content awareness built into the engine with shared buffer for handling data. -
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Astra Platform
Astra Platform
A single line of code to supercharge your LLM with integrations and without complex JSON schemas. Spend minutes, not days adding integrations to your LLM. With only a few lines of code, the LLM can perform any action in any target app on behalf of the user. 2,200 out-of-the-box integrations. Connect with Google Calendar, Gmail, Hubspot, Salesforce or more. Manage authentication profiles so your LLM can perform actions on behalf of your users. Build REST integrations or easily import from a OpenAPI spec. Function calling requires the foundation model to be fine-tuned which can be expensive and diminish the quality of your output. Enable function calling with any LLM, even if it's not natively supported. With Astra, you can build a seamless layer of integrations and function execution on top of your LLM, extending its capabilities without altering its core structure. Automatically generate LLM-optimized field descriptions. -
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Bijira
WSO2
WSO2 Bijira is an AI-native, cloud-native SaaS API management platform built to manage the full lifecycle of APIs, including design, security, governance, deployment, and monitoring, across internal, external, egress, and AI-driven APIs in hybrid and multi-cloud environments. It provides a unified control plane for consistent API policy, security, and analytics while supporting visual API proxy mapping, drag-and-drop policy management, and a customizable developer portal to accelerate API adoption and reuse. Bijira leverages AI tools to help generate OpenAPI specs, test APIs using natural language prompts, validate compliance with governance rules, and feed insights back into the API development process. It integrates robust security mechanisms, including OAuth2, OIDC, fine-grained access control, and firewall protections, and enforces governance-as-code with AI-assisted policy validation. -
34
Gram
Speakeasy
Gram is an open source platform that enables developers to create, curate, and host Model Context Protocol (MCP) servers effortlessly, by transforming REST APIs (via OpenAPI specs) into AI-agent-ready tools without code changes. It guides users through a workflow: generating default tooling from API endpoints, scoping down to relevant tools, composing higher-order custom tools by chaining multiple calls, enriching tools with contextual prompts and metadata, and instantly testing within an interactive playground. With built-in support for OAuth 2.1 (including Dynamic Client Registration or user-authored flows), it ensures secure agent access. Once ready, these tools can be hosted as production-grade MCP servers, complete with centralized management, role-based access, audit logs, and compliance-ready infrastructure, including Cloudflare edge deployment and DXT-packaged installers for easy distribution.Starting Price: $250 per month -
35
Langdock
Langdock
Native support for ChatGPT and LangChain. Bing, HuggingFace and more coming soon. Add your API documentation manually or import an existing OpenAPI specification. Access the request prompt, parameters, headers, body and more. Inspect detailed live metrics about how your plugin is performing, including latencies, errors, and more. Configure your own dashboards, track funnels and aggregated metrics.Starting Price: Free -
36
BMC middleware management software provides real-time monitoring and administration for messaging-oriented middleware environments including IBM® MQ, Integration Bus (IIB), App Connect Enterprise (ACE), Apache ActiveMQ, and DataPower and TIBCO Enterprise Message Service (EMS). Automate alerts and gain insight into a wide array of middleware technologies with a single, intuitive solution. MainView Middleware Monitor securely provides real-time monitoring and automatic notification of potential problems to ensure an optimally performing middleware layer. Analyze historical data to identify patterns, predict trends, and solve reoccurring problems. Maximize application availability and mitigate risk with proactive problem detection and automated resolutions. Improve productivity and efficiency for managing, administering, and troubleshooting with flexible dashboards for infrastructure and application views.
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37
Ceptor API Management
Ceptor
Features range from a Service Repository with built-in support for authoring APIs to full support for Ceptor's many proven authentication and authorization methods over full API Gateway functionality to a customizable API Developer Portal supporting self-registration which allows you to expose your APIs to both internal and external consumers. Where other products focus mostly on monetizing APIs, Ceptor API Management is more focused on providing flexibility to enterprising solving complex use cases that go far beyond simply publishing and subscribing to APIs. Ceptor API Management allows you to create as many API Groups as you need, you can use Ceptor's default templates or create your own. Ceptor supports various different types of APIs including OpenAPI, SOAP / WSDL and plain HTTP. You can document your APIs using the OpenAPI Specification or Ceptor’s built-in HTML editor. -
38
Imperva API Security
Imperva
Imperva API Security protects your APIs with an automated positive security model, detecting vulnerabilities in your applications, and shielding them from exploitation. Organizations manage a minimum of 300 APIs on average. Imperva’s API Security amplifies your security posture by automatically generating a positive security model for every uploaded API swagger file. APIs are being churned out faster than security teams can review, influence, and sign off on before they’re pushed into production. Imperva’s API Security enables your teams to stay ahead of DevOps via automation. Imperva API Security empowers your approach with out-of-the-box security rules adjusted to your APIs. This ensures complete OWASP API coverage and promotes visibility for all security events per API endpoint. With API Security, simply upload the OpenAPI specification file that your DevOps team has created and Imperva will automatically build a positive security model. -
39
Fern
Fern
Stripe-level SDKs and Docs for your API. Offer type-safe SDKs in the most popular languages. Let Fern do the heavy lifting of generating and publishing client libraries so your team can focus on building the API. Import your API definition, whether it's in OpenAPI or Fern's simpler format. Select which code generators you'd like to use: TypeScript, Python, Java, Go, Ruby, C#, Swift. Fern semantically versions and publishes packages to each registry (e.g. npm, pypi, maven). Beautiful API documentation that reflects your brand.Starting Price: $250 per month -
40
API Agent
IBM
API Agent in IBM API Connect is a watsonx.ai–powered assistant that automates core tasks across the entire API lifecycle via a natural‑language, conversational interface. Built on an agentic framework, it lets teams rapidly generate OpenAPI specifications, mocked responses, and rich documentation for design‑first projects, or connect to backend data sources, build application code, and auto‑deploy to Code Engine for code‑first workflows, all without manual setup. To combat API sprawl, API Agent intelligently searches your existing API catalog by simple description prompts, recommending reusable endpoints and reducing duplication. It enforces governance by validating specs against organizational rulesets, suggesting or applying fixes automatically, and boosts quality with a built‑in testing suite that generates and runs semantic test cases to catch issues early. -
41
Qarbon LATTICE
Qarbon Technologies
Qarbon LATTICE, a SaaS-based orchestration platform can provide a single, OpenAPI interface between data centers and customers. Qarbon will transform the status quo for digital infrastructure customers. LATTICE is a SaaS-based platform that onboards the entire tech stack of each data center, providing users with a single, open, and secure interface between the operator and their business systems. LATTICE provides customers with an OpenAPI-compliant interface between data centers and their customers. OpenAPI is the leading industry specification for a machine-readable interface definition language for both humans and machines. LATTICE enables seamless, standardized reporting of ESG data, including scope I and II CO2 emissions. Customers will be able to access real-time, standardized power, water, and CO2 data, for data center-related ESG reporting through a button-click. Qarbon is a platform that securely transfers data between workflow management and data center systems. -
42
AlertSite
SmartBear
AlertSite is the 'Early Warning System' you can trust to monitor your websites, web apps, and APIs from all over the world and within your private networks. You shouldn't be burdened by the fear and the consequence of whether an alert is real or false. AlertSite monitors your UI and API layer for availability, performance, and functionality without the alert fatigue of other monitoring tools. Creating Web and API monitors in AlertSite is intuitive and effortless. Codelessly add new web monitors with DejaClick, our point-and-click web recorder, and API Monitors in just a few clicks using an API Endpoint URL or OpenAPI Specification file. Or, reuse test cases like Selenium Scripts or SoapUI tests to create new monitors. Don't let false alerts and erroneous data cloud your visibility into application health. -
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Google Cloud Endpoints
Google
Develop, deploy, protect, and monitor your APIs with Cloud Endpoints. An NGINX-based proxy and distributed architecture give unparalleled performance and scalability. Using an OpenAPI Specification or one of our API frameworks, Cloud Endpoints gives you the tools you need for every phase of API development and provides insight with Cloud Logging, Cloud Monitoring, and Cloud Trace. Control who has access to your API and validate every call with JSON Web Tokens and Google API keys. Integration with Auth0 and Firebase Authentication lets you identify the users of your web or mobile application. Extensible Service Proxy delivers security and insight in less than 1 ms per call. Deploy your API automatically with App Engine and Google Kubernetes Engine, or add our proxy container to your Kubernetes deployment. Monitor critical operations metrics in Google Cloud Console, and gain insight into your users and usage with Cloud Trace, Cloud Logging, and BigQuery. -
44
OpenText B2B Integration Enterprise
OpenText
OpenText B2B Integration Enterprise is a cloud‑based, managed EDI‑as‑a‑Service platform that simplifies complex enterprise integration by combining a scalable, high‑availability infrastructure with decades of B2B expertise and a pre‑connected global trading community. It offers a unified integration environment that connects over one million trading partners and processes thirty‑one billion transactions annually, enabling organizations to modernize legacy systems without additional hardware, accelerate time‑to‑market for products and channels through self‑service onboarding and auto‑provisioning, and eliminate internal silos by supporting any‑to‑any connectivity via EDI, XML, APIs, and PEPPOL adapters. Built‑in managed services include proactive system monitoring, health checks, data backups, and application support, while real‑time visibility and alerting dashboards deliver end‑to‑end transaction insights and business event notifications. -
45
AppMap
AppMap
Runtime code reviews for every code change in the code editor and in CI. Catch runtime performance, security, and stability problems while you code, before they hit production. Collaborate on a team member’s application behavior problem without having to replicate their environment. Automate AppMap generation in CI, get alerts for performance and security flaws, and compare observability and alerts across branches and teams. Run AppMap in CI to automate observability, create OpenAPI docs, and much more. AppMap code reviews link to rich resources that enable you to uncover the root causes of unexpected behavior. Sequence diagrams diffs vividly showcase behavioral changes in your code.Starting Price: $15 per user per month -
46
Specmatic
Specmatic
Specmatic offers a no-code, specification-driven, visual approach to API testing by leveraging API specifications to automatically execute positive and negative tests. Specmatic Studio offers broad format and protocol support across REST, SOAP, GraphQL, gRPC, WebSockets, and asynchronous messaging systems (message queues and event-driven APIs). The platform provides a comprehensive toolkit for API development and testing, utilizing specs as the single source of truth. Key features include: • Contract testing across various protocols • Service virtualization and mocking • Workflow and resiliency testing • Backward compatibility checks to prevent breaking changes • Open-source testing tools for OpenAPI, MCP and SOAP • Postman collection import for spec creation Specmatic focuses on functional correctness, contract compliance, resiliency, and compatibility testing. Genie assists API design, enabling interactive validation of the API spec prior to generating an MCP server.Starting Price: $2500 per month (50 seats) -
47
Kiota
Microsoft
Kiota is a client, plugin, and manifest generator for HTTP REST APIs described by OpenAPI. Available as a command-line tool and a Visual Studio Code (VS Code) extension, Kiota enables developers to search for API descriptions, filter and select specific endpoints, and generate models and a chained method API surface in various programming languages. This approach eliminates the need to depend on different API clients for each API and allows for precise generation of the required API surface area. Additionally, Kiota facilitates participation in the Microsoft Copilot ecosystem by enabling the generation of API plugins. The VS Code extension enhances the Kiota experience with a rich user interface, supporting features such as searching for API descriptions, filtering endpoints, and generating API clients. Users can select desired endpoints and generate clients, plugins, or other outputs, with completion notifications and easy access to generated outputs within the workspace.Starting Price: Free -
48
Smarter Integration
Smarter Integration
Configuration of a specific service is provided by a properties file, which is a text file and easily manageable. A configuration properties file dictates the behaviour of the service such as validation, transformation, logging, audit, etc. The configuration properties file can be auto-generated via a GUI. The design of the platform allows for information to be provided dynamically so there is no requirement to deploy any code in the event a change is required. Speed of service deployment is very short. Once a configuration properties file is defined and the service functionally tested, it can be deployed. There are no code changes and zero downtime for the application. If a change is required to the configuration element, a dedicated API can be triggered to automatically reload the local memory cache. There is absolutely no requirement for Copy & Paste of code. -
49
CodeRifts
CodeRifts
CodeRifts is a zero-config GitHub App for API compatibility governance. It detects breaking changes in OpenAPI 2.0, 3.0, and 3.1 specs on every pull request — before merge. Unlike linters that only check syntax, CodeRifts scores risk across 4 dimensions, calculates blast radius, identifies affected downstream clients, and estimates economic impact in dollars. It enforces governance policies automatically and blocks risky PRs. Other tools tell you WHAT broke. CodeRifts tells you HOW MUCH it costs. Supports GitHub App, GitHub Actions, GitLab CI, Bitbucket, CLI, REST API, and MCP protocol. Built for teams where a single breaking API change costs $10k–$50k in downstream fixes. Zero CI configuration required — install the GitHub App and governance starts on the next PR. Detects 72 behavioral drift patterns including auth flow changes, retry policy drift, and agent protocol shifts. Trusted by backend and platform teams who ship APIs consumed by mobile apps, third-party integrations, andStarting Price: $49/month -
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Kusk
Kubeshop
Kusk is an Open Source API Gateway that allows you to develop, monitor and deploy your APIs in a matter of minutes. Kusk powers-up your API workflows with mocked responses and validated requests out-of-the-box and automates the deployment of the API Gateway with your favorite GitOps workflows. Have a single source of truth for your API by using the OpenAPI Standard, meaning no additional configuration files are needed!Starting Price: Free
