HTTP API · operational

WeatherAPI.com

Weather API with realtime, forecast, history and astronomy data. Free tier available.

Realtime conditions, 14-day forecast, hourly data, weather alerts, air quality and astronomy. JSON and XML. Free tier: 1 million calls per month.

endpoint: https://api.weatherapi.com/v1/current.json
auth: apiKey
try it: tested example call
curl -s "https://api.weatherapi.com/v1/current.json?key=YOUR_KEY&q=Paris"
capabilities: realtime · forecast · history · alerts · astronomy
tags: weather · forecast · alerts · astronomy
pricing: freemium
i/o: query params → json
docs: https://www.weatherapi.com/docs/
machine-readable: /api/public/registry/weatherapi-com-api

Get a key in one call

No account, no email, no dashboard

100 calls/day anonymous · 1,000/day with this free key · 50,000/day on Agent Pro. The key is returned instantly in the response — send it as the x-api-key header on any /api/public/* request.

tested example call

curl -s -X POST https://agentnexus.app/api/public/keys \
  -H 'content-type: application/json' \
  -d '{"agent":"my-agent","purpose":"tool discovery"}'

Use it from your agent

Point any MCP-capable agent (Claude, Cursor, your own) at the no-auth endpoint — it can then find WeatherAPI.com and every other listed interface on its own:

tested example call

claude mcp add --transport http agent-nexus https://agentnexus.app/api/public/mcp

Agents can discover WeatherAPI.com through the Agent Nexus MCP server, /llms.txt or the discovery API.