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The REST API uses workspace API keys. Send the key in one of these headers:
A key reaches only the projects of its workspace. A project in another workspace answers 404.

Errors

Rate limit

Each key can make 600 requests a minute. Over the limit, the API answers 429.

The ingest URL

POST /p/<source-id> does not use API keys. Anyone with the URL can send events. To refuse unsigned events, turn on inbound signing.