API Development MCP Servers for DeepSeek Harness

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.

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.

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

Register an event callback address.

Find and call verified APIs from any AI assistant, with free trial calls and previewed writes.

Validate emails, phones, IBAN, VAT; look up IPs and companies; rates, holidays, time via Abstract.

Webhook, email and DNS inboxes for AI agents to capture callbacks and test integrations.

Evidence-cited machine-readable contracts for how agent platform APIs really behave