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Guides / Getting startedQuickstartGet an API key, send your first message, and confirm delivery.API reference / MessagesPOSTSend a messageSend iMessage or SMS, with media, voice memos, and message effects./send-api-messageGuides / IntegrationsWebhooksReceive message and call events at your own endpoint.Guides / Getting startedAuthenticationCreate an API key and authenticate requests with a bearer token.AI tools / AI toolsMCP server & skillConnect Claude, Codex, Cursor, and other AI tools to Project Blue.
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Supported media

Use the mediaAttachmentUrl field to send rich media with your messages. The following formats are supported.

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Images

JPEG / JPGPNGGIFWebP

Videos

MP4MOVAVIMKVFLVWebM

Contact cards

VCF / vCard
Guides