"AI Programming with Standards-Driven Development" matching MCP connectors:

Any API, four tools: discover, call with routing and signed receipts, verify, dispute.

Turn any task into the right API calls: discover, evaluate, and integrate public APIs.

JMeterA

ai.jmeter.docs

Point Claude Code, Qwen Code, Cursor, or any MCP client at https://docs.jmeter.ai/api/mcp and your agent answers JMeter questions grounded in this documentation, with a source link for every answer. Free, no API key, no signup.

Search the JoJ API marketplace, read endpoint docs, and call any API with one key via one gateway.

Ephemeral mailboxes and a mock OAuth IdP for testing email and auth flows — 39 API-driven tools covering mailboxes, mails, attachments, domains, teams, and mock identities.

Deterministic JSON checks with signed evidence and x402-paid execution

Anonymous webhook capture, inspection, waiting, and response configuration for AI agents.

pipeheroA

io.github.pipehero

Debug webhooks from your AI agent: inspect and replay captured webhooks on localhost.

Deterministic validation for AI-generated artifacts: JSON Schema, OpenAPI response, SQL syntax.

API governance for AI agents. Detects breaking changes, scores blast radius, blocks unsafe calls.

Swagger Petstore API (v1.0.27) as MCP for testing and prototyping powered by the HAPI MCP server

Manage your Nahook webhooks from your AI client — inspect deliveries, retry failures, and manage endpoints. Connects over OAuth, no API keys

Free platform to test MCP clients without installing anything. Create mock tools with dynamic templates, configurable delays, conditions (if/then), and response sequences. Supports JSON-RPC 2.0 over Streamable HTTP. Built-in text_echo and json_echo tools. Rate-limited tiers: anonymous (5 calls/min, 1 mock tool), registered (10 calls/min, 4 mock tools), premium (60 calls/min, unlimited). Zero setup — no install, no registration required. More info: https://www.testmcp.dev

Simceptor is an AI-native Mock API simulation platform with a built-in MCP server. It enables AI agents to create, inspect, update, and test dynamic mock APIs, conditional response rules, stateful session simulations, and network latency directly from context.

HttpStatus MCP Server — 24 AI-callable tools for API testing, mocking, monitoring, and security. Create and manage API mocks, run chaos engineering rules, validate OpenAPI specs, scan URLs for security issues, check SSL certificates, debug CORS, analyze redirect chains, decode JWTs, inspect HAR files, trace distributed requests, capture webhooks, build automation workflows (including Postman import), and set up uptime monitors — all from your AI assistant.

MCP server for AI access to SmartBear tools, including BugSnag, Reflect, Swagger, PactFlow, QTM4J.

MCP server for AI access to Swagger by SmartBear.

Build, validate, and manage API simulations in WireMock Cloud from MCP-compatible AI agents.

OneOAuth

ai.withone

Search, document and execute authenticated API calls across 700+ apps via one MCP server

webhook.coOAuth via extension

co.webhook

Receive, inspect, replay and deliver webhooks — with signature verification and agent triggers.