API Development MCP Servers for Codex CLI

Whether a token is an HTTP method

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

WSDL 2.0 interface count, markup discarded

Discover x402 APIs by capability, price & trust. Powered by x402Scout.

Discover and call 10,000+ production APIs from one MCP server. Pay-per-call billing for AI agents.

Deterministic repository oracle for AI agents: inventory, dependency graph, frontend-backend join.

Try 26 utility REST APIs keylessly: NAICS classification, IP geo, email validation, currency.

Turn OpenAPI services into tools an agent can call under your rules.

Discover, rate and compare APIs and providers in the APIs.io catalog; manage a listing you own.

Quality scoring and progressive gates for AI-generated API tests. Stripe/Twilio profiles. Free tier.

Signed API declarations for agent handoffs. Free demo and verification; receipts cost 0.002 USDC.

Public webhook relay with signed observations, retries and verified receivers. Self-service.

Premium agentic endpoint for api-key-load-balancer-mcp.

Premium agentic endpoint for api-rate-limit-enforcer-mcp.

Cloudflare Workers MCP server: form-backend

Behind Check and GAIP Watch, and Diagnose: A2A, MCP and OpenAPI checks with a dated change log.

Webhook capture bins for agents: get a URL, wait for webhooks, set replies, verify signatures.

Public HTAG discovery for MCP tools, API endpoints, OpenAPI ops, and agents.

Meaning of HTTP 307.

Meaning of HTTP 501.

AI-callable tools for API mocking, testing, monitoring, security, and automation.