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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
Point Gecko at an OpenAPI spec; get first-call-correct, auth-hidden agent tools.
Deterministic validation for AI-generated artifacts: JSON Schema, OpenAPI response, SQL syntax.
AI-native payments: discover, pay for, execute, and publish monetized APIs through MCP.
Apideck Unified API MCP — 330 tools across 200+ SaaS connectors (accounting, CRM, HRIS, ATS).
Debug webhooks from your AI agent: inspect and replay captured webhooks on localhost.
Unified gateway exposing 150+ tools across all NexGenData MCP servers via one endpoint.
JSONPlaceholder MCP — wraps JSONPlaceholder fake REST API (free, no auth)
Cloudflare Workers MCP server: api-schema-drift-detector
Cloudflare Workers MCP server: interactive-api-playground
Cloudflare Workers MCP server: api-contract-validator
An MCP server that provides tools to validate an email address using Dilli Email Validation API.
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
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
Find and verify x402 tools before paying; route by task, budget, network, and readiness.