This endpoint needs no authentication and returns the full upstream specification including organisation APIs. The Regular Accounts edition is a filtered subset, not a different backend version. Use operation IDs and explicit schema validation when generating a client.
Replace all REPLACE_* placeholders and environment values with data for your authorized test account. Use a new UUID in IDEMPOTENCY_KEY for each logical action where shown; use the actual latest revision for If-Match. Examples of writes change real data if run.
curl --fail-with-body -X GET 'https://handwrites.io/api/v1/openapi.json'
Use the paired API reference for complete request/response schemas. See API specification notes for rate limits, error handling, safe retries and additional policy/plan failures. For binary or empty responses, do not call a JSON parser.