Index onlineMerchant portal
Api Endpoint

Quartermaster Payment Proof

Verify an x402 settlement on Base OR Solana: pass a 0x transaction hash or a base58 signature, confirm it succeeded, decode its USDC transfers (event logs on Base, net token-balance deltas on Solana), and optionally assert the receiving wallet and amount.

Open interactive test console

Offering

Provider
quartermaster.surewhynot.app
Method
GET
Offering type
Api Endpoint
Transport type
http
Category
Blockchain And Crypto
Delivery
Not provided
Pricing model
Not provided
x402 version
2

Endpoint context

URL
https://quartermaster.surewhynot.app/v1/payment-proof
MIME type
application/json
First seen
2026-10-16T01:50:14.534Z
Last seen
Tags
X402, settlement, Verification, receipt, Payments, audit, Base

Website

Payment pricing

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

Payment option 1
0.003 USDC
Atomic price: 3000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Payment option 2
0.003 USDC
Atomic price: 3000 · Network: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · Asset: USDC · Scheme: exact
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "3000",
    "payTo": "0x5253666c40432f009ebd99908b9cd2a7fd1019cb"
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "3000",
    "payTo": "FgcKNzsBXSEHGNZNWetPsjXiBZk1WFoU6sF2zVsnzXfa"
  }
]

Observed health

Status
Healthy
Latest latency
62 ms
Average latency
800 ms
HTTP status
402
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": [
        "GET"
      ]
    },
    "queryParams": {
      "type": "object",
      "properties": {
        "hash": {
          "type": "string",
          "pattern": "^0x[0-9a-fA-F]{64}$",
          "description": "Base transaction hash to verify"
        },
        "payTo": {
          "type": "string",
          "description": "Optional: assert USDC was received by this wallet"
        },
        "amount": {
          "type": "string",
          "description": "Optional: assert the USDC amount (human decimal)"
        }
      },
      "required": [
        "hash"
      ]
    }
  },
  "required": [
    "type",
    "method"
  ],
  "additionalProperties": false
}

Output schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "input": {
      "additionalProperties": false,
      "properties": {
        "method": {
          "enum": [
            "GET"
          ],
          "type": "string"
        },
        "queryParams": {
          "properties": {
            "amount": {
              "description": "Optional: assert the USDC amount (human decimal)",
              "type": "string"
            },
            "hash": {
              "description": "Base transaction hash to verify",
              "pattern": "^0x[0-9a-fA-F]{64}$",
              "type": "string"
            },
            "payTo": {
              "description": "Optional: assert USDC was received by this wallet",
              "type": "string"
            }
          },
          "required": [
            "hash"
          ],
          "type": "object"
        },
        "type": {
          "const": "http",
          "type": "string"
        }
      },
      "required": [
        "type",
        "method"
      ],
      "type": "object"
    },
    "output": {
      "properties": {
        "example": {
          "type": "object"
        },
        "type": {
          "type": "string"
        }
      },
      "required": [
        "type"
      ],
      "type": "object"
    }
  },
  "required": [
    "input"
  ],
  "type": "object"
}