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Error codes · Monitors, checks & agents

RU-3003: Check not found

No check with that ID exists in this account. Checks belonging to other accounts answer exactly the same way, so this code cannot confirm whether an ID exists elsewhere.

On the wire

Ships with HTTP status 404, carrying "code": "RU-3003" in the response body alongside the human-readable error message. Existing fields are never replaced by the code: it is additive.

Common causes

  • The check was deleted.
  • The ID belongs to a different account or environment.
  • A typo in the ID.

How to fix it

  1. List your checks (GET /api/v1/checks) and confirm the ID.
  2. Confirm the API key belongs to the account that owns the check.

Still stuck?

Ask support and mention RU-3003: the code pins down the exact refusal path, so you skip the diagnostic back-and-forth.