Best API Tools MCP Servers

A simple, secure MCP-to-OpenAPI proxy server

Swagger Petstore API (v1.0.27) as MCP for testing and prototyping powered by the HAPI MCP server

Agent gateway for Index discovery, AN Score evaluation, and Resolve governed execution

MCP server for the Trello REST API – manage boards, lists, cards, labels, checklists and more

AI agent website builder. Create and publish link-in-bio sites via MCP or REST API.

Query 155 verified US county parcel ArcGIS REST endpoints for owner/APN lookup. No API key needed.

Local-first MCP gateway and homelab control plane with CLI, HTTP API, and web UI.

VantaGate MCP Server & OpenAPI integration - Human-in-the-Loop for AI Agents

Governed AI actions with signed, verifiable receipts: free keyless reads, human-approved writes.

Gateway between LLM agents and world data through eight tools and a bundled endpoint catalog.

Professional prompt library over remote MCP: 13 verticals, free discovery scope.

Live data gateway for AI — 3,300+ tools across 750+ sources, with citations

Event bus for AI agents: watch_topic long-polls live events; manage topics, schemas, webhooks.

Remote MCP server exposing SMI Aware tools, resources, and skills over Streamable HTTP.

HAPI MCP server: Dynamically exposes OpenAPI REST APIs as MCP tools for AI assistants

Remote MCP server for product discovery catalog and retrieving product details.

ComPDF remote MCP server

Hosted MCP gateway for Web3 infra discovery across 20+ networks via one endpoint.

Turn any OpenAPI 3.x spec into callable MCP tools for Claude. No custom integration code needed.

MCP server that converts OpenAPI specs into tools which can query API endpoints

Remote MCP for A2A caller identity, scope policy, verdict receipts, and audit history.

Remote MCP server for OFAC screening, EDD memos, exposure forecasts, queues, and reports.

Remote MCP for Kiro release readiness, evidence binders, signoff, and CI approval receipts.

Built-environment forecasts, public benchmarks, and permit or zoning readiness through remote MCP.

A paid remote MCP for Pydantic AI structured output, built to return verdicts, receipts, usage logs,

Remote MCP for A2A dependency inspector MCP, structured receipts, audit logs, and reviewer-ready evi

A paid remote MCP for agent memory MCP, built to return verdicts, receipts, usage logs, and audit-re

Remote MCP for AI waiver checks, exception approvals, expiry review, and audit receipts.

Paid remote MCP for governed database query review, SQL simulation, approvals, and audits.

The Universal Agent Gateway (UAG) enables in-process agentic automation using Form.io.