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PostAgent Print & Mail
x402
PostAgent Print & Mail is a paid API for AI agents from api.postagent.sh, paid per call via x402, $1.24/call, status unknown (last checked 2026-10-12).
Prints and mails a physical US letter or postcard via USPS, paid in USDC using the x402 payment protocol
Price / call$1.24
Success—
StatusUnknown
How this service works
Print and mail physical US letters (PDF, HTML, Markdown, DOCX, or image) and postcards via USPS, paid in USDC — with certified/registered proof options and standalone address verification at POST /v1/verify. Integration flow: POST /v1/documents to upload, POST /v1/quotes to lock a fixed USDC price for a recipient, then pay the returned per-quote x402 URL to create and mail the piece. Price is fixed per quote.
Output
Returns a job confirmation indicating the letter or postcard has been created and queued for USPS mailing, along with a job ID and status. If a webhookUrl was provided, the endpoint will POST job status updates (e.g. printed, mailed, delivered) to that URL as the piece moves through the mail system.
Example use cases
Example prompt
“Send this HTML invoice as a physical USPS letter to Jane Smith at 123 Main St, Austin TX 78701 — I already have a quote locked in, so go ahead and pay and mail it, and notify me at https://myapp.com/webhooks/mail when it's done.”
Technical details
Endpoint
POSThttps://api.postagent.sh/v1/print?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to physically mail a document to a US address via USPS, especially when paying programmatically in USDC. Prefer this over email or digital delivery when legal proof of delivery (certified/registered mail) is required, when the recipient has no digital access, or when a physical postcard or letter is the required medium. It fits well into agentic workflows that handle invoicing, legal notices, government correspondence, or marketing mail entirely in code.
Side effects
- Invalid or expired quote ID — must re-run POST /v1/quotes to get a fresh locked price
- Payment failure — USDC payment via x402 not completed or insufficient funds
- Invalid recipient address — address failed USPS verification (use POST /v1/verify first)
- Unsupported document format — file type not in PDF/HTML/Markdown/DOCX/image set
- Document ID not found — must upload via POST /v1/documents before calling /v1/print
- Webhook URL unreachable — optional webhookUrl returns non-2xx during registration
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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