# SameDayDesk Settlement Proof Verifier

> SameDayDesk Settlement Proof Verifier is a paid API for AI agents from agents.samedaydesk.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Verifies and returns cryptographic proof that a specific on-chain USDC payment on Base mainnet was successfully settled, including transaction details and transfer confirmation.

## Facts

- Endpoint: GET https://agents.samedaydesk.com/commerce/settlement-proof
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/samedaydesk-settlement-proof-verifier-86b46200
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_j1LEC4Cn-EOOdQEMl-A4Y

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability samedaydesk-settlement-proof-verifier-86b46200
```

Example prompt: Can you pull the settlement proof for the USDC payment with transaction hash 0xcfcbb3...a8987 on Base mainnet — I need to confirm that 0.005 USDC went from 0x990C...7f17 to 0x8904...3Cee and that it was fully verified?

## When to prefer this

Use this endpoint when an AI agent or automated system needs cryptographic, deterministic proof that a specific on-chain USDC payment on Base mainnet completed successfully — particularly for x402 or MPP pay-per-call flows where auditability matters. Prefer this over general blockchain explorers when you need a structured, machine-readable settlement verdict with boundary metadata (confirming no private ledger access) suitable for automated trust decisions.

## Known failure modes

- Transaction hash not found on Base mainnet — returns error or unverified decision
- Payer or recipient address mismatch — findings array populated with discrepancy details
- Incorrect USDC amount transferred — verified field returns false
- Transaction still pending — block confirmation not yet available
- Invalid wallet address format — request rejected
- Payment to wrong recipient — recipientTransferCount mismatch flagged in findings

## How this service works

Deterministic agent APIs for web and company intelligence, repository security, agent-work economics, machine-service discoverability, payment preflight and settlement proof, wallet context, and Morpho decision evidence. Pay per call through Base x402 or native MPP, with a Circle Gateway Nanopayments path for gasless batched USDC.

## Output

Returns a JSON object with a top-level 'ok' flag, asset details (USDC on Base), the original request parameters (payer, recipient, amount, tx hash), a 'decision' field ('verified' or otherwise), a 'settlement' block with observed vs expected amounts and transfer counts, a 'transaction' block with status/block number/timestamp, a 'boundary' block clarifying data access scope, and a 'findings' array for any anomalies. Timestamp of the check is also included.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "transactionHash",
      "recipient",
      "amountAtomic"
     ],
     "properties": {
      "payer": {
       "type": "string",
       "pattern": "^0x[0-9a-fA-F]{40}$",
       "description": "Optional expected canonical Base USDC payer."
      },
      "recipient": {
       "type": "string",
       "pattern": "^0x[0-9a-fA-F]{40}$",
       "description": "Expected canonical Base USDC recipient."
      },
      "amountAtomic": {
       "type": "string",
       "pattern": "^[1-9][0-9]{0,20}$",
       "maxLength": 21,
       "description": "Expected positive USDC amount in six-decimal atomic units."
      },
      "transactionHash": {
       "type": "string",
       "pattern": "^0x[0-9a-fA-F]{64}$",
       "description": "Base mainnet transaction hash containing the claimed canonical USDC transfer."
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "ok",
      "product",
      "version",
      "checkedAt",
      "decision",
      "request",
      "chain",
      "asset",
      "transaction",
      "settlement",
      "findings",
      "boundary"
     ],
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "asset": {
       "type": "object"
      },
      "chain": {
       "type": "object"
      },
      "product": {
       "type": "string",
       "const": "samedaydesk-base-usdc-settlement-proof"
      },
      "request": {
       "type": "object"
      },
      "version": {
       "type": "string"
      },
      "boundary": {
       "type": "object"
      },
      "decision": {
       "enum": [
        "verified",
        "not_verified",
        "receipt_unavailable"
       ],
       "type": "string"
      },
      "findings": {
       "type": "array"
      },
      "checkedAt": {
       "type": "string"
      },
      "settlement": {
       "type": "object"
  
… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "asset": {
   "symbol": "USDC",
   "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
   "decimals": 6
  },
  "chain": {
   "id": 8453,
   "name": "Base mainnet",
   "network": "eip155:8453"
  },
  "product": "samedaydesk-base-usdc-settlement-proof",
  "request": {
   "payer": "0x990C...7f17",
   "recipient": "0x8904dF3DE6DFEe6a7C8cc38619d2f17806213Cee",
   "amountAtomic": "5000",
   "transactionHash": "0xcfcbb3...a8987"
  },
  "version": "1.0.0",
  "boundary": {
   "source": "public Base mainnet receipt and logs",
   "walletAccessed": false,
   "privateLedgerRead": false,
   "executionAuthorized": false,
   "auditedTransactionModified": false
  },
  "decision": "verified",
  "findings": [],
  "checkedAt": "2026-08-11T08:30:00.000Z",
  "settlement": {
   "observed": {
    "payer": "0x990C...7f17",
    "recipient": "0x8904dF3DE6DFEe6a7C8cc38619d2f17806213Cee",
    "amountUsdc": "0.005",
    "amountAtomic": "5000"
   },
   "verified": true,
   "exactTransferCount": 1,
   "recipientTransferCount": 1
  },
  "transaction": {
   "hash": "0xcfcbb3...a8987",
   "status": "success",
   "blockNumber": "49823378",
   "blockTimestamp": "2026-08-11T08:15:03.000Z"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/samedaydesk-settlement-proof-verifier-86b46200/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agents.samedaydesk.com](https://www.zero.xyz/host/agents.samedaydesk.com/llms.txt)