5 Free Data APIs Every AI Developer Should Bookmark in 2026

Source: Dev.to

Building AI agents that need real‑world data? Here are five authoritative, free APIs you should know about — plus a bonus tool that helps you discover them all.

World Bank API

• What: GDP, population, poverty, education indicators for 200+ countries
• API:
• Format: JSON / XML
• Rate limit: None (public)

# Get China GDP (current USD) for 2020‑2024
curl "https://api.worldbank.org/v2/country/CN/indicator/NY.GDP.MKTP.CD?format=json&date=2020:2024"

Perfect for: economic analysis, country comparisons, development research.

International Monetary Fund (IMF) Data API

• What: World Economic Outlook, Balance of Payments, financial statistics
• API:
• Format: JSON (SDMX)
• Rate limit: Reasonable

# List available datasets
curl "https://dataservices.imf.org/REST/SDMX_JSON.svc/Dataflow"

Perfect for: macroeconomic forecasting, financial modeling, policy analysis.

WHO Global Health Observatory API

• What: Health indicators, disease statistics, mortality data for 190+ countries
• API:
• Format: JSON (OData)
• Rate limit: None

# List all health indicators
curl "https://ghoapi.azureedge.net/api/Indicator"

Perfect for: health research, epidemic tracking, public‑health AI agents.

Open‑Meteo Weather API

• What: Weather forecasts, historical weather, climate data globally
• API:
• Format: JSON
• Rate limit: 10,000 requests/day (free tier)

# Get a 7‑day forecast for Beijing
curl "https://api.open-meteo.com/v1/forecast?latitude=39.9&longitude=116.4&daily=temperature_2m_max"

Perfect for: weather‑aware agents, agriculture, logistics optimization.

Federal Reserve Economic Data (FRED) API

• What: 800,000+ US & international economic time series
• API:
• Format: JSON / XML
• Rate limit: 120 requests/minute

# Get US unemployment rate (replace YOUR_KEY with a free API key)
curl "https://api.stlouisfed.org/fred/series/observations?series_id=UNRATE&api_key=YOUR_KEY&file_type=json"

Perfect for: financial analysis, economic indicators, market research.

Bonus: FirstData Curated Directory

FirstData is an open‑source knowledge base that catalogs verified data sources from governments, international organizations, and research institutions. It includes MCP integration for easy discovery by AI agents.

{
  "mcpServers": {
    "firstdata": {
      "url": "https://firstdata.deepminer.com.cn/mcp"
    }
  }
}

Features

• Search by domain (e.g., “find health data APIs in Asia”)
• Filter by authority: government, international org, research institution
• Detailed metadata: update frequency, documentation links, access instructions

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