Inbox
List thread messages
Lists messages in the thread ordered from oldest to newest. Each message lists its attachments; download one with downloadMessageAttachment.
GET
/v1/threads/{id}/messagesAuthorization
bearerAuth AuthorizationBearer <token>
Use an account API key in the Authorization header: Authorization: Bearer f_....
In: header
Path Parameters
idstring
Inbox thread id.
Format
uuidcurl -X GET "https://example.com/v1/threads/497f6eca-6276-4993-bfeb-53cbbbba6f08/messages"{ "data": [ { "id": "306a0f4d-2aca-4d34-ab18-53a4b50b10eb", "thread_id": "f064bce3-eb45-4edf-b7d0-6d316846f4f6", "direction": "sent", "subject": "Furnace API thread", "body_text": "First touch", "from_email": "sender@example.com", "to_email": "lead@example.com", "received_at": "2026-05-21T17:59:00.000Z", "attachments": [ { "index": 0, "filename": "bid.pdf", "content_type": "application/pdf", "size": 245644, "downloadable": true, "not_downloadable_reason": null } ] } ]}{ "error": { "type": "authentication_error", "code": "invalid_api_key", "message": "A valid Furnace API key is required" }}{ "error": { "type": "invalid_request_error", "code": "campaign_not_found", "message": "Campaign not found" }}{ "error": { "type": "rate_limit_error", "code": "rate_limit_exceeded", "message": "Rate limit exceeded for this account" }}{ "error": { "type": "api_error", "code": "internal_error", "message": "Internal server error" }}