"How to obtain an API key" matching MCP servers:

Defeatbeta API is an open-source alternative to Yahoo Finance's market data APIs, designed to provide reliable and high-performance financial data.

MCP server that resolves postal/ZIP codes to place names, states, and coordinates using Zippopotam.us. Free, no API key required.

Hourly electricity grid carbon intensity (gCO2eq/kWh) for 45 zones across Europe, the US and Great Britain, computed from ENTSO-E, EIA and NESO generation data. Four read-only tools; every value carries its interval timestamp and how stale it is. No API key, no account.

USDA nutrition API optimized for AI agents. x402 + USDC on Base

Enables searching and retrieving classical music works, scores, and recordings from IMSLP via natural language, without requiring an API key or account. It respects IMSLP's crawl policies and reports copyright status per jurisdiction.

An MCP server that searches across the Internet Archive and Library of Congress at once, merging results while keeping each archive's differences. Provides tools to search inside texts, search catalogues, and retrieve item records, all read-only and without an API key.

Enables querying key financial figures from Danish companies' published annual reports via CVR number, using XBRL data from Erhvervsstyrelsen, without an API key.

An MCP server for the Internet Archive that enables searching the full text of digitized books, browsing the catalogue, and reading Wayback Machine captures. No API key or configuration required.

MCP server for querying the Bibliothèque nationale de France catalogue. Enables searching authors and works, retrieving author details, listing editions, and finding digitised documents via SPARQL, without an API key.

Enables currency conversion and exchange rate lookups using real ECB reference rates, free and without an API key. Supports natural language queries like 'convert 100 USD to EUR' or 'what's the exchange rate between GBP and JPY?'.

MCP server to search and retrieve job postings from companies' Lever job boards, including reading full job details and filter vocabularies, with no API key required.

An MCP server that exposes World of Warcraft character data from the Blizzard API, offering read-only tools for character summaries, equipment, Mythic+ scores, realm lookup, and other character sub-resources.

An MCP server for the U.S. Census Bureau's International Trade Data API, enabling queries of monthly export and import statistics by HS, NAICS, end-use, and other classifications, with tools for trade balance, top partners, and country code lookup.

Daily source-attributed gold and macro readings from xaudaily.com — gold price, CPI, payrolls, Treasury yields, FOMC odds, central-bank gold buying. Every field carries its own source and as-of date. No API key.

Ask about the Saudi economy in plain English or Arabic. No API key or database required.

Correlation, ETF holdings overlap, beta, volatility and diversifiers for 4,700+ US stocks and ETFs, any of 11.3M pairs. Free API, no key, read-only.

Enables natural-language querying of US WARN Act layoff notices across 48 states since 1988, including searches, employer histories, state totals, and agency revisions, with no API key.

Provides Claude and any MCP client with plain-English access to official San Antonio-area public data including weather alerts, school ratings, and 311 service calls, with no API keys required.

An MCP server that provides weather forecasts and current conditions for any city via the free Open-Meteo API, with no API key or account required.

Search and read public Ashby job boards for named companies, with filtering, full job details, and side-by-side compensation comparison. No API key required.