{"uid":"cap_FHh-Q93pL6eVxfGnRMRhB","slug":"emboss-pdf-form-filling-and-fax-delivery-api-db393567","name":"Emboss — PDF Form-Filling and Fax Delivery API","description":"Turn a blank PDF and your data into finished forms. Emboss proposes each answer with its source, fills and verifies the PDF, and returns a receipt.","url":"https://api.getemboss.ai/pay/fax?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"to":{"type":"string","pattern":"^\\+[1-9][0-9]{6,14}$","description":"Destination fax number in E.164 form."},"pdf_url":{"type":"string","format":"uri","description":"public https URL of the PDF form to process"},"sources":{"type":"array","items":{"type":"object","required":["artifact_id"],"properties":{"pages":{"type":"string","description":"An optional page range, such as 1-3,7."},"artifact_id":{"type":"string","description":"A prior artifact's id."},"artifact_token":{"type":"string","description":"The bearer token for an anonymous artifact_id."}}},"maxItems":20,"description":"A list of prior artifacts, faxed together as one packet, in place of pdf_url/pdf_base64/artifact_id -- exactly one of sources, pdf_url, pdf_base64, or artifact_id is required."},"pdf_base64":{"type":"string","description":"the PDF form as base64 (alternative to pdf_url)","contentEncoding":"base64"},"artifact_id":{"type":"string","description":"The id of a previously registered artifact to fax, in place of pdf_url/pdf_base64 -- exactly one of pdf_url, pdf_base64, or artifact_id is required."},"artifact_token":{"type":"string","description":"The bearer token for artifact_id, required whenever the artifact has no owner account (an anonymous caller's own prior result)."}}},"responseSchema":{"type":"json","example":{"job_id":"<uuid>","status":"ready","quote_id":"<uuid>","status_url":"https://api.getemboss.ai/pay/jobs/<uuid>?token=<token>","proposal_id":"<uuid>","commit_token":"<token>","proposal_url":"https://api.getemboss.ai/proposals/<uuid>?token=<token>"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.03","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"registry","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.03/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.03","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.03","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_dei8MoVbQnMu5nKlttMpJ","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.03","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bda02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Fill a PDF form with AI-proposed answers sourced from supporting documents, then deliver the completed form by fax to a specified phone number.","exampleAgentPrompt":"Fill out this intake form at https://clinic.example.com/intake.pdf using my insurance card and ID documents I uploaded earlier, then fax the completed form to +12125550199.","exampleUseCases":[{"title":"Medical intake form faxed to clinic","prompt":"I need you to fill out this patient intake PDF at https://hospital.org/intake.pdf using my prior records artifact abc-123 and fax the completed form to +13105550177."},{"title":"Insurance claim form submission by fax","prompt":"Take this blank insurance claim form at https://insurer.com/claim.pdf, fill it in using my supporting documents from artifact id def-456, and fax it to the claims department at +18005550234."},{"title":"Government application form delivery","prompt":"Fill out this government application form from https://agency.gov/app.pdf using the documents I provided in artifact xyz-789 and send the completed form by fax to +12025550188."}],"resultDescription":"Returns a JSON object containing a job_id, initial status ('ready'), a quote_id, a status_url for polling job progress, a proposal_id and proposal_url for reviewing AI-proposed answers with their sources, and a commit_token to authorize the final fill-and-send step.","failureModes":["Invalid or unreachable pdf_url returns an error before processing begins","Fax number not in valid E.164 format causes request rejection","More than one of pdf_url, pdf_base64, artifact_id, or sources provided simultaneously causes a validation error","Referenced artifact_id not found or token mismatch returns unauthorized error","PDF has no detectable form fields, resulting in an empty proposal","Fax delivery failure to unreachable or invalid destination number","Payment not completed via x402 results in 402 response before job is queued"],"whenToPreferThis":"Choose this endpoint when you need to both AI-fill a PDF form AND deliver it by fax in one workflow — particularly for healthcare, legal, or insurance use cases where fax is the required delivery channel. If you only need to fill a PDF without faxing it, use the sibling fill-only endpoint. Prefer this over manual faxing services when you also want AI-sourced field proposals with citations from supporting documents.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-17T06:31:13.525Z","isFirstParty":false,"canonicalSlug":"emboss-pdf-form-filling-and-fax-delivery-api-db393567"}