Emboss

Emboss Pay-per-call API

The anonymous pay door at api.getemboss.ai/pay: make fillable, fill from data, fill with context, read a filled form back, and fax, each priced per job by page count, plus a free stateless quote. No account or key — the first request answers 402 with an x402 challenge (USDC on Base, or gasless via Circle Gateway) and an MPP challenge (Tempo USDC.e or a card via Stripe Shared Payment Tokens); resend the identical request with the payment credential and poll a tokened status URL. Always ephemeral. The OpenAPI carries x-payment-info on every operation and is the entry Emboss publishes in its ARD/AIR catalogue.

Documentation GitHub OpenAPI

Operations 6

POST /pay/make-fillable Turn a flat or scanned PDF form into a fillable PDF with detected fields. #

POST /pay/fill-with-context Fill a PDF form using facts found in supporting documents. #

POST /pay/fill Fill a PDF form from structured data such as JSON or key-value answers. #

POST /pay/read Read the values out of a filled PDF form, labelled by field, with a completeness verdict when the form is known. #

POST /pay/fax Send a PDF to a fax number and track delivery, priced per transmitted page. #

POST /pay/quote Free price check for a PDF #

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OpenAPI Specification

openapi: 3.1.0
info:
  title: Emboss
  version: 1.1.0
  description: 'Emboss turns any PDF form into a fillable one, fills it from data or supporting documents, reads a filled form back, and faxes the result to any fax number. Operations: make fillable, fill from values, fill from documents, read a filled form back, send by fax. Pay per operation over plain HTTP with x402 or MPP, no account needed. Account, MCP and A2A doors are described at the links in x-service-info.'
  x-guidance: 'Emboss turns any PDF form into a fillable one, fills it from data or supporting documents, reads a filled form back, and faxes the result to any fax number. Paid operations, each a POST with the PDF as JSON (pdf_url or pdf_base64) or as a multipart file field: POST /pay/make-fillable turns a flat PDF into a fillable one; POST /pay/fill fills a PDF from a JSON object of field values (`values`: an object in the JSON body, or a JSON string in the `values` form field); POST /pay/fill-with-context fills a PDF from supporting documents (`context_base64` or `context` files, `context_text`, or `context_urls`); POST /pay/read reads a filled PDF back into labelled values; POST /pay/fax faxes the PDF to a destination number (`to`, E.164 form such as +15025551212), priced per transmitted page, cards with a 0.50 USD minimum and stablecoins at the exact price. Send the request with no payment first: the server answers 402 with a WWW-Authenticate: Payment challenge (methods: tempo stablecoin
    USDC.e at the exact price, or stripe card via Shared Payment Tokens with a 0.50 USD minimum). Pay it, resend the identical request with the Authorization: Payment credential, and receive 202 with job_id, status_url and quote_id plus a Payment-Receipt header. Poll status_url until the job is ready and download the result from it. Prices scale with page count; the 402 challenge always carries the exact amount. Free: POST /pay/quote with the PDF returns the page count and the exact price of each operation before you pay. Capabilities: Turn a flat or scanned PDF form into a fillable PDF with detected fields; Fill a PDF form from structured data such as JSON or key-value answers; Fill a PDF form using facts found in supporting documents; Read the values out of a filled PDF form, labelled by field, with a completeness verdict when the form is known; Send a PDF to a fax number and track delivery, priced per transmitted page. Every 402 offers two ways to pay: MPP (Tempo USDC.e or a card, WWW-Authenticate:
    Payment) and x402 (USDC on Base, PAYMENT-REQUIRED header); pay either and resend the same request. The x402 accepts list also carries one gasless entry per Circle Gateway chain (extra.name GatewayWalletBatched); pay any entry.'
  contact:
    name: Emboss
    url: https://getemboss.ai
    email: contact@getemboss.ai
servers:


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# Full source: https://raw.githubusercontent.com/api-evangelist/getemboss-ai/refs/heads/main/openapi/getemboss-ai-pay-per-call-openapi.yml