Print and mail a physical US letter (PDF, HTML, Markdown, DOCX, or image) via USPS, paid in USDC. 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 letter. Price is fixed per quote.
| Network | Scheme | Amount | Pay To |
|---|---|---|---|
| Base | exact | $1.37 USDC | 0x4ecc...007F |
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| Network | Address | USDC Balance | ETH Balance | Tx Count |
|---|---|---|---|---|
| Base | 0x4ecc...007F | $18.24 | 0.000000 ETH | 0 |