Index onlineMerchant portal
Api Endpoint

PostAgent

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.

Open interactive test console

Offering

Provider
api.postagent.sh
Method
POST
Offering type
Api Endpoint
Transport type
http
Category
Business And Commerce
Delivery
Not provided
Pricing model
Not provided
x402 version
2

Endpoint context

URL
https://api.postagent.sh/v1/print
MIME type
application/json
First seen
2026-10-16T01:50:14.534Z
Last seen
Tags
mail, print, letters, usps, fulfillment

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1
1.24 USDC
Atomic price: 1240000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1240000",
    "payTo": "0x4ecc58bb1e8FC25eEfA23f071bd78c98660A007F"
  }
]

Observed health

Status
Healthy
Latest latency
64 ms
Average latency
399 ms
HTTP status
204
Last checked
Reachability
100% over 14 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "http"
    },
    "method": {
      "type": "string",
      "enum": [
        "POST"
      ]
    },
    "queryParams": {
      "type": "object",
      "properties": {
        "webhookUrl": {
          "type": "string",
          "description": "Optional HTTPS URL that receives job status webhooks after the letter is created."
        }
      }
    }
  },
  "required": [
    "type",
    "method"
  ],
  "additionalProperties": false
}

Output schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string"
    },
    "example": {
      "type": "object"
    }
  },
  "required": [
    "type"
  ]
}