Captions for UGC clips, as an API.

1,017 clips built in — or bring your own footage. Add styled captions, get back an mp4. Built for AI agents: no account, no API key, pay per render with x402.

1,017built-in UGC clips

$0.10USDC per render · Base

10–30stypical render time

Request builder

POST /overlay

Footage source

Clip

Caption Position

Style

Text stroke

any #RRGGBB

Font size 72px

{}

Pick footage

Browse GET /clips (filter with ?tag=, ?q=) and grab a clip_id — or pass your own video_url.

POST /overlay

First call returns HTTP 402 with payment details. Sign $0.10 USDC on Base and retry with a PAYMENT-SIGNATURE header.

Poll & download

GET /overlay/result/<job_id> until done, then download the mp4 (expires in 24h).

Endpoints

Method	Path	Notes
GET	/clips	Free catalog: `?tag=` `?q=` `?page=` `?limit=`
POST	/overlay	$0.10 USDC — `clip_id` or `video_url` + `text` + styling
GET	/overlay/result/:id	Job status; `video_url` when done
GET	/demo	Free sample render
GET	/.well-known/x402	Machine-readable payment discovery
GET	/openapi.json	OpenAPI 3.1