API reference

The Tend API is a JSON REST API at https://api.tendcomputer.com/v2. Authenticate with Authorization: Bearer <key>. Current API version: 2026-03-01.

Resources

Errors

HTTP	Code	Meaning
400	`invalid_request`	The request body or query parameters could not be parsed or failed validation. The `details` field lists the offending fields.
400	`invalid_cron_expression`	The cron expression is malformed, or the timezone is not a valid IANA zone name.
401	`missing_api_key`	No Authorization header was sent, or it was not in the form `Bearer <key>`.
401	`invalid_api_key`	The key does not exist, has been revoked, or does not begin with `tnd_live_` or `tnd_dev_`.
403	`insufficient_scope`	The key is valid but lacks the scope required for this operation, such as writing schedules with a read-only key.
404	`resource_not_found`	The job, schedule, or run ID does not exist in this project and environment. Keys from `tnd_dev_` and `tnd_live_` cannot see each other's resources.
409	`idempotency_conflict`	An `Idempotency-Key` was reused within 24 hours with a different request body.
409	`schedule_name_taken`	A schedule with this name already exists in the project. Schedule names are unique per environment.
413	`payload_too_large`	The job payload exceeds 256 KB after JSON encoding.
422	`interval_too_short`	The schedule would fire more often than once every 30 seconds, which is the minimum interval.
422	`run_at_in_past`	The requested `run_at` time is more than 60 seconds in the past. Small clock skew is tolerated; yesterday is not.
429	`rate_limit_exceeded`	The project exceeded its requests-per-minute limit. Retry after the number of seconds in the `Retry-After` header.
429	`quota_exceeded`	The monthly run quota for a Hobby project has been reached. Paid plans are billed for overage instead and never receive this error.
503	`region_unavailable`	The requested region is temporarily unable to accept new jobs. Retry, or omit `region` to route to the default.