autobot.team SMS API

This is a Gmail-backed Google Voice conversation API. It is not an official Google Voice API.

Boundary

v1 can only reply to existing Google Voice Gmail notification threads.
Requests for recipients without a paired conversation return 409 conversation_required.
A dead Google grant returns 428 gmail_reauth_required with a reauth_url to open, re-consent, and retry.
Bulk or mass messaging is rejected.

Endpoints

GET /api/sms/timeline
POST /api/sms/sync
GET /api/sms/conversations
GET /api/sms/conversations/{conversation_id}
POST /api/sms/conversations/{conversation_id}/messages
POST /api/sms/send
POST /api/sms/messages/{message_id}/retry

Platform

Google Voice messaging guidance documents personal messaging behavior; this API rejects bulk sends.
Gmail users.messages.send sends RFC 2822 MIME messages encoded as base64url.
Gmail threading rules require a thread id, matching subject, and reply headers.