Rate limits

Limit	Default
Sockets per API key	5
HTTP requests per API key	120 per minute, shared across `/v1/metar*`
Distinct airports per API key	100, across all its sockets; an airport on two sockets counts once
Sockets server-wide	256

The socket and HTTP request limits per API key are To be confirmed · D6.

Over a limit: 429 with Retry-After. With 27 stations the airport cap cannot be reached today.

Sockets

A sixth socket is refused before the upgrade:

Response body

{"error":"rate_limited",
 "message":"too many connections for this API key",
 "retry_after_s":30}

When the server-wide cap is reached, the upgrade is refused with 503.

Going over the airport cap is an error with code too_many_airports: HTTP 422 on the handshake, an error message on an open socket.

Placeholder · A6

HTTP status codes and JSON error bodies.