API Development MCP Servers for Codex CLI

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 webhook inboxes for agents. Receive OAuth redirects, payment callbacks and CI notifications.

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

Meaning of HTTP 501.

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

Scores how well AI agents will use your API, 0-100, from its OpenAPI spec. Free and read-only.

Schema-aware API monitoring: diff OpenAPI specs for breaking changes, manage endpoints.

Free MCP, API auth, webhook and schema diagnostics with bounded checks and safe quote routing.

Deterministic JSON Schema validation with exact violations and conservative type normalization.

APIs.guru MCP — keyless directory of 2,500+ public APIs and their OpenAPI specs.

Aggregated live-data gateway exposing 5,000+ tools across 1,300+ verified public sources (business registries, government, market, news

Convert REST API specifications (OpenAPI 3.x, Swagger 2.x, OpenAPI Actions) into MCP tools for AI agents. Supports JSON and YAML formats.

Send and debug webhooks — applications, endpoints, messages, delivery attempts and replays.

Production proofs for breaking JSON Schema/MCP changes; UNKNOWN/NO_WITNESS_FOUND not compatible.

Traffic Parrot simulates APIs and messaging. Request or withdraw a trial, read docs, send feedback.

Monitor third-party API changes in GitHub repos, map breaks to files, open reviewable auto-fix PRs.

Verified, reproduced behavior of public HTTP APIs: spec gaps, errors, pagination, auth.

Email verification for AI agents: verify single or bulk emails, check credits and history.