Watermark a PDF

curl -X POST "$DOATHING_API/v1/documents/pdf-watermark" \
  -H "x-api-key: $DOATHING_KEY" \
  -H "content-type: application/json" \
  -d '{"file": {"filename": "report.pdf", "content_type": "application/pdf", "data_b64": "<base64>"}, "text": "DRAFT", "options": {"opacity": 0.12}}'

A diagonal DRAFT, or your logo, on every page at the opacity you choose.

Stamp a text or image watermark onto every page of a PDF at a chosen angle and opacity.

Input

Send a file object with base64 data_b64, its content_type and a filename. Accepted types: application/pdf.

The declared type is not trusted — the bytes are sniffed and a contradiction is rejected rather than corrected.

Response

The result carries your remaining balance alongside it, so you can track spend without a second call.

{
  "pages_stamped": 12,
  "opacity": 0.12,
  "request_id": "37f01edb-0163-42a1-ac51-0acaef979800",
  "credits_remaining": 96
}

Cost

3 credits per call, whether it is run from the site or from the API — the credential differs, the price does not. A new account starts with 20 credits.

A rejected request still costs a credit: the authorizer decrements before the tool validates. A call rejected for a missing or invalid key is free.