API Development MCP Servers for ChatGPT

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.

Build and operate declarative REST/Kafka services on Orion: 58 tools over the full admin API.

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

Send and receive webhooks, manage customer endpoints, and inspect and retry deliveries.

Discover, compare, and monitor 1,400+ APIs directly from your AI coding agent.

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

Verified, pay-per-use API tools for AI agents through one authenticated connection.

MCP server for secureFlows: token-free URL builders and integration-linting tools for AI agents.

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

Spring Boot example that exposes SpringDoc OpenAPI operations as safe MCP tools.

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.

Test webhook endpoints — send requests, measure latency, validate responses. x402 micropayment.

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.

Reliable one-off and recurring HTTPS callbacks for apps and agents.