"Simple HTTP server or client implementation" matching MCP connectors:

Audits a sample of HTTP request URLs against explicit, documented cache-key standardization rules...

Experimental MCP server for current empirical verification of explicit public HTTPS endpoint claims.

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.

Cloudflare Workers MCP server: api-contract-validator

Jentic Remote MCP ServerA

io.github.jentic

Remote MCP for 1,500+ APIs. Vault-managed credentials; OAuth or API key. Search, load, and execute.

mcpAOAuth

com.mux

The official MCP Server for the Mux API

Cloudflare Workers MCP server: api-schema-drift-detector

Cloudflare Workers MCP server: interactive-api-playground

Cloudflare Workers MCP server: api-payload-auditor

Cloudflare Workers MCP server: api-mock-server

Cloudflare Workers MCP server: api-diff-monitor

KeployA

io.github.keploy

End-to-end API testing — generate and run tests from OpenAPI, curl, Postman, or real user traffic.

MCP server that delivers up-to-date Bitrix24 REST API documentation.

dilli-email-validation-api-serverB

com.dillilabs.deva

An MCP server that provides tools to validate an email address using Dilli Email Validation API.

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

40+ developer tools from Context7, Code Runner, Python Execute, NPM Sentinel, PlantUML, and Microsoft Learn. Docs lookup, code execution, security scanning. Starts at $0.01/call. Get your API key at app.xpay.sh or xpay.tools

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

Instant no-signup webhook & HTTP-request inspector for testing webhooks and agent tool-callbacks.

OpenAPI.city

city.openapi

MCP server and REST API for querying OpenAPI specs. Endpoint-level extraction, schema resolution, 100+ APIs indexed.