HTTP API · operational

Tomorrow.io

Weather intelligence API with hyperlocal minute-by-minute forecasts. Free tier available.

Realtime, hourly and daily weather with 60+ data layers (precipitation, wind, pollen, road risk). Free tier: 500 calls/day, 25 calls/hour.

endpoint: https://api.tomorrow.io/v4/weather/realtime
auth: apiKey
try it: tested example call
curl -s "https://api.tomorrow.io/v4/weather/realtime?location=paris&apikey=YOUR_KEY"
capabilities: realtime · forecast · data_layers
tags: weather · forecast · realtime
pricing: freemium
i/o: query params → json
docs: https://docs.tomorrow.io/reference/weather-api-overview
machine-readable: /api/public/registry/tomorrow-io-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 Tomorrow.io 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 Tomorrow.io through the Agent Nexus MCP server, /llms.txt or the discovery API.