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ERR_MATHPIX_SUBMIT_FAILED — Mathpix Submit Failed

HTTP Status: 502 Retryable: Yes Automatic retry: The system retries up to 2 times with 2-second backoff. This error surfaces only after all retries are exhausted.

What the User Sees

Math processing service is temporarily unavailable. (ERR_MATHPIX_SUBMIT_FAILED)

What Causes This Error

The Mathpix API (https://api.mathpix.com) returned a 5xx error or was unreachable during PDF submission. Mathpix is only used for documents that contain mathematical content — equations, formulas, and scientific notation. It provides superior math-to-LaTeX conversion compared to general-purpose vision models.

The submission step uploads the PDF to Mathpix for processing. A 5xx response indicates Mathpix infrastructure issues, while a connection failure suggests network problems between Cloudflare Workers and the Mathpix API.

This error can also occur if the Mathpix account has exceeded its monthly usage quota, in which case the response may be a 402 or 429 that is mapped to this error code.

Resolution Steps

For Users

  1. Wait a few minutes and try again. The math processing service may be experiencing temporary issues.
  2. Try the “standard” quality tier, which uses vision models instead of Mathpix for math content. The results may be slightly less accurate for complex equations but will not depend on Mathpix availability.
  3. If the document has only a small amount of math content, the standard tier may produce acceptable results.

For Administrators

  1. Check the Mathpix dashboard at https://accounts.mathpix.com for service status and usage.
  2. Verify that MATHPIX_APP_ID and MATHPIX_APP_KEY Worker secrets are valid and have not expired.
  3. Test Mathpix connectivity:
    Terminal window
    curl -X POST https://api.mathpix.com/v3/pdf \
      -H "app_id: $MATHPIX_APP_ID" \
      -H "app_key: $MATHPIX_APP_KEY" \
      -F "file=@test.pdf"
  4. Check if the Mathpix monthly usage quota has been exceeded. If so, consider upgrading the plan or waiting for the quota to reset.
  5. Monitor Grafana for Mathpix error rate trends.