Everything you need to build on Fernway.

Every error returns a stable code, a human message and a request ID you can quote to support.

List endpoints return pages of results with a cursor. Pass next_cursor back to get the next page.

Limits apply per API key. Watch the RateLimit headers and back off on 429.

Send an Idempotency-Key with every POST so a retried request never creates a second message.

Pin a dated API version per request. Breaking changes ship only in a new version, with at least 90 days of notice.

Every message moves from queued to sent to delivered or failed. Here is what each status means and when it fires.