Detect likely fields on a flat PDF and return an AcroForm fillable PDF.
The first 12,000 characters of the PDF’s text go to an outside AI model through OpenRouter. What happens to it
{}
POST returns HTTP 402 Payment Required until paid.
curl -s -X POST https://gate402.app/v1/pdf-fillable \
-H 'content-type: application/json' \
-d '{…}'
# → 402, then retry with PAYMENT-SIGNATURE / X-PAYMENT