Create branded PDFs and images from a saved design or from HTML through the API. 1 credit makes 1 file. You start free with 50 credits a month and no card. Read https://thirds.ai/docs/api-reference.
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Last verified: October 13, 2026
Public test lab configuration summary for this API.
https://thirds.ai/Methods
Verified endpoint examples
/v1/image-assets/{id}/ai-historyRead private generated image history
/v1/ai-image-proposals/{message_id}Read a saved image suggestion
/v1/ai-image-proposals/{message_id}/applyKeep an image suggestion with an applied layout
Keep this owned successful message’s image suggestion after applying its layout. This call does not generate an image or spend credits. A rejected suggestion can be restored by this explicit action.
/v1/templates/{template_id}/messages/{message_id}/image-proposalRead a chat image proposal
Read the private prompt and aspect ratio without spending credits. A new chat message rejects an unapplied suggestion. Applied frames stay available to fill later.
+72 more endpoints
{
"html": "<h1>Quarterly report</h1><p>Ready to share.</p>"
}Tracked public interactions for this catalog entry.
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