Best Claude Code mcp servers for api development on Agent (May 2026)

Unified API gateway and marketplace for 300+ AI agents. One API key, REST + streaming, 90% creator revenue share, health monitoring. Self-hostable (MIT).

Self-improving tool discovery for AI agents. Searches registries, installs MCP servers as subprocesses, and persists tool knowledge across sessions — no restarts needed.

Unified data API for AI agents — 300+ free, public, and government data sources behind a single API key. Access economic (FRED, BLS), environmental (EPA, NOAA), health (CDC, FDA), weather (NWS), financial (SEC, CFPB), science (NASA, arXiv), and 30+ more categories. Install: `npx…

MCP server for xAI's [Grok API](https://docs.x.ai/docs/overview) with agentic tool calling, image generation, vision, and file support.

1,500+ developer infrastructure deals, free tiers, and startup programs across 54 categories. Search deals, compare vendors, plan stacks, and track pricing changes. REST API and web browser at [agentdeals.dev](https://agentdeals.dev).

Unified API hub for AI agents with 56+ tools across travel (Amadeus, Sabre), prediction markets (Polymarket), crypto, and weather. Pay-per-call via x402 micropayments in USDC.

OpenAPI-MCP: Dockerized MCP Server to allow your AI agent to access any API with existing api docs.

MCP server + command line tool that allows agents to see & control long-running processes like web servers. Start, stop, restart, read logs.

Email infrastructure for AI agents. Create inboxes on the fly, send and receive real emails, search messages, and manage threads via API. Install with `npx clawaimail-mcp`.

Official Model Context Protocol (MCP) server for FastAlert. This server allows AI agents (like Claude, ChatGPT, and Cursor) to list of your channels and send notifications directly through the FastAlert API.

A server that connects to the Databricks Genie API, allowing LLMs to ask natural language questions, run SQL queries, and interact with Databricks conversational agents.

Seamlessly Integrate Any API with AI Agents (with OpenAPI Schema)

Extracts essential code structure from large codebases into AI-digestible format, helping AI agents write code that correctly uses existing APIs on the first attempt.

x402-native API gateway with 20+ capabilities (web-extract, web-search, translate, image-generate, screenshot, PDF, OCR, and more) payable with USDC on Base. No API keys — agents pay per call via HTTP 402.

MCP server that helps AI agents explore OpenAPI specs, search endpoints, and generate TypeScript types.

MCP server that provides Typescript API information efficiently to the agent to enable it to work with untrained APIs

Allow AI agents to interact with Alchemy's blockchain APIs.

Coinpaprika's DexPaprika MCP server exposes high-performance [DexPaprika API](https://docs.dexpaprika.com) covering 20+ chains and 5M+ tokens with real time pricing, liquidity pool data & historical OHLCV data, providing AI agents standardized access to comprehensive market data…

Open marketplace for AI services — LLMs, image/video generation, web scraping, model hosting, data extraction, and more. Agents pay per use with USDC micropayments on Polygon. No API keys, no subscriptions.

Tastyworks API integration to handle trading activities on Tastytrade

European financial data for AI agents — ECB rates, Eurostat inflation, GDP and unemployment by EU country. Zero API key needed. [](https://glama.ai/mcp/servers/nexusforge-tools/mcp-eu-finance)

63 deterministic quant finance tools for AI agents — options pricing, risk metrics, portfolio optimization, Monte Carlo, technical indicators, crypto/DeFi, and FX/macro. 1,000 free calls/day, no API key.

Interact with [Twelve Data](https://twelvedata.com) APIs to access real-time and historical financial market data for your AI agents.

Real-time crypto market data for AI agents — market health scores, derivatives, funding rates, ETF flows, cycle indicators, and 100+ endpoints via CryptoDataAPI.

SEC EDGAR signal intelligence for AI agents — insider trading (Form 4), 13F institutional holdings, 10-K/8-K filing velocity, activist risk flags, and multi-company disclosure comparisons. Three pricing tiers. Available on the Apify Store.

Deterministic reasoning engine for AI agent context compression. Extracts structured facts with logical inference, proof chains, and truth maintenance. REST API, Python/TypeScript SDKs, and MCP server integration.

Three-layer memory system for agents (identity/active/archive) with semantic search, graph relationships, conflict detection, and LearningMachine. Built by an agent, for agents. No API keys required.

Connect AI agents to the Counsel API for strategic reasoning, multi-perspective debate analysis, and interactive advisory sessions.

Collaborative astronomy wiki built by AI agents. 34 topics, 115 knowledge graph connections. Register, read, edit, vote, comment, and explore the cosmos via open API. No auth required.

Search Millions of local businesses worldwide (Europe, Northamerica, Southamerica, Asia, Oceania), confidence scores, and agent trust rankings. No API key required. [](https://glama.ai/mcp/servers/discava/mcp-server)

Data freshness verification for AI agents. Probes endpoints for HTTP cache staleness, latency percentiles, content fingerprinting, TLS health, DNS timing, and redirect chains. Returns deterministic FRESH/STALE/UNKNOWN verdicts with NIST AI RMF mapping. CLI + MCP server + HTTP AP…

Deep research MCP server for OpenAI Responses API or Open Deep Research (smolagents), with web search and code interpreter support.

YouTube transcript extraction for AI agents. Clean text, timestamps, or structured JSON from any video. No API keys required. Install via `npx rippr-mcp`.

AI-powered domain brainstorming, analysis, and availability checking via AgentDomainService.com. Generate creative domain names from descriptions, get AI scoring for brandability/memorability, and check real-time availability with pricing. No API keys required.

Query articles, verified statistics, wire feed, and social tools from [The Agent Times](https://theagenttimes.com), the AI-native newspaper covering the agent economy. 13 tools including search, comments, citations, and agent leaderboards. No API key required.

Zero-knowledge password manager with MCP credential gateway. BIP-39 seed phrase recovery, deterministic passwords, policy-gated AI agent access (scope, rate limits, time windows, step-up approval), 70+ API key providers, and hash-chain audit trail. Go + Next.js + TypeScript.

Credential isolation proxy for AI agents. Injects secrets at the network boundary with domain restrictions, agent authentication, and audit logging. No SDK required — works as a transparent HTTP proxy or MCP server.

A Model Context Protocol (MCP) server written in Go that empowers AI agents and Large Language Models (LLMs) to seamlessly interact with Kanboard. It transforms natural language commands into Kanboard API calls, enabling intelligent automation of project, task, and user manageme…

Permissionless communication supercharger for AI agents — phone calls, SMS, fax, translation (119 languages), text-to-speech, audiobook generation, plus image/video/music/text generation and document extraction. Pay per request via Lightning (L402) — no signup or API keys.

Unofficial MCP server that allows AI agents to discover Shopify storefronts and interact with them to fetch products, collections, and other store data through the Storefront API.

A lightweight, configuration-driven MCP server that exposes curated GraphQL queries as modular tools, enabling intentional API interactions from your agents.