Weather API

Current weather and 7-day forecast -- temperature, humidity, wind, precipitation. Any location worldwide. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.

Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.

Quickstart -- MCP

Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):

config.json

{
  "mcpServers": {
    "weather-api": {
      "url": "https://weather-api.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

Terminal

curl -X POST "https://weather-api.api.klymax402.com/api/weather" \
  -H "Content-Type: application/json" \
  -d '{}'
# -> 402 Payment Required, with an x402 payment challenge in the response body

Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.

Tools

Tool	Method	Path	Price	Description
`data_get_weather`	POST	`/api/weather`	$0.003	Get current weather and forecast for a location

`data_get_weather`

Use this when you need current weather conditions or a 7-day forecast for any location. Returns weather data in JSON.

Parameters

Name	Type	Required	Description
`latitude`	number	no	Latitude (-90 to 90)
`longitude`	number	no	Longitude (-180 to 180)
`city`	string	no	City name (alternative to lat/lon, uses geocoding)

Example response:

config.json

{"location":{"city":"Paris","country":"France","latitude":48.85,"longitude":2.35},"current":{"temperature":18.5,"humidity":62,"windSpeed":12,"precipitation":0,"weatherCode":"partly_cloudy"},"forecast":[{"date":"2026-04-14","tempMin":12,"tempMax":20,"precipitation":0.2}]}

When to use: travel planning, outdoor event scheduling, agriculture monitoring, logistics planning, and building weather-aware applications.

Not for: timezone info (use utility_convert_timezone), stock data (use finance_get_stock_price).

Example agent prompts

"Current weather conditions or a 7-day forecast for any location"

Payment

Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
Network: Base L2 (eip155:8453)
Asset: USDC
Facilitator: Coinbase CDP (primary), PayAI (fallback)
Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)

Part of klymax402

100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.

Catalog: https://klymax402.com/llms.txt
Full API reference: https://klymax402.com/llms-full.txt
Live stats: https://klymax402.com/stats

License

MIT