x402-data-gateway

Verify Base USDC Settlement

settlement_proof

Verify one claimed canonical Base USDC settlement after execution by matching a successful transaction receipt to the exact recipient, atomic amount, and optional payer. Use payment_offer_preflight before authorization when you need to inspect an unpaid x402 or MPP offer instead. This tool reads only public Base receipt and log data; it reads no merchant ledger and performs no wallet, signing, broadcast, custody, or execution action. Payment challenge and credentials are bound to GET https://agents.samedaydesk.com/commerce/settlement-proof, not mcp://. Retry the identical authorized arguments and credential.

Input Schema

TableJSON Schema

Name	Required	Description
`payer`	No	Optional expected canonical Base USDC payer.
`recipient`	Yes	Expected canonical Base USDC recipient.
`amountAtomic`	Yes	Expected positive USDC amount in six-decimal atomic units.
`transactionHash`	Yes	Base mainnet transaction hash containing the claimed canonical USDC transfer.

Output Schema

TableJSON Schema

Name	Required	Description	Default
`ok`	Yes
`asset`	Yes
`chain`	Yes
`product`	Yes
`request`	Yes
`version`	Yes
`boundary`	Yes
`decision`	Yes
`findings`	Yes
`checkedAt`	Yes
`settlement`	Yes
`transaction`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedAug 20, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": false,
+  "properties": {
+    "asset": {
+      "additionalProperties": false,
+      "properties": {
+        "address": {
+          "type": "string"
+        },
+        "decimals": {
+          "const": 6,
+          "type": "number"
+        },
+        "symbol": {
+          "const": "USDC",
+          "type": "string"
+        }
+      },
+      "required": [
+        "address",
+        "symbol",
+        "decimals"
+      ],
+      "type": "object"
+    },
+    "boundary": {
+      "additionalProperties": false,
+      "properties": {
+        "auditedTransactionModified": {
+          "const": false,
+          "type": "boolean"
+        },
+        "executionAuthorized": {
+          "const": false,
+          "type": "boolean"
+        },
+        "privateLedgerRead": {
+          "const": false,
+          "type": "boolean"
+        },
+        "source": {
+          "const": "public Base mainnet receipt and logs",
+          "type": "string"
+        },
+        "walletAccessed": {
+          "const": false,
+          "type": "boolean"
+        }
+      },
+      "required": [
+        "source",
+        "privateLedgerRead",
+        "auditedTransactionModified",
+        "walletAccessed",
+        "executionAuthorized"
+      ],
+      "type": "object"
+    },
+    "chain": {
+      "additionalProperties": false,
+      "properties": {
+        "id": {
+          "const": 8453,
+          "type": "number"
+        },
+        "name": {
+          "const": "Base mainnet",
+          "type": "string"
+        },
+        "network": {
+          "const": "eip155:8453",
+          "type": "string"
+        }
+      },
+      "required": [
+        "id",
+        "name",
+        "network"
+      ],
+      "type": "object"
+    },
+    "checkedAt": {
+      "format": "date-time",
+      "type": "string"
+    },
+    "decision": {
+      "enum": [
+        "verified",
+        "not_verified",
+        "receipt_unavailable"
+      ],
+      "type": "string"
+    },
+    "findings": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "code": {
+            "type": "string"
+          },
+          "message": {
+            "type": "string"
+          },
+          "severity": {
+            "const": "error",
+            "type": "string"
+          }
+        },
+        "required": [
+          "severity",
+          "code",
+          "message"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "ok": {
+      "type": "boolean"
+    },
+    "product": {
+      "const": "samedaydesk-base-usdc-settlement-proof",
+      "type": "string"
+    },
+    "request": {
+      "additionalProperties": false,
+      "properties": {
+        "amountAtomic": {
+          "type": "string"
+        },
+        "payer": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "recipient": {
+          "type": "string"
+        },
+        "transactionHash": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "transactionHash",
+        "recipient",
+        "amountAtomic",
+        "payer"
+      ],
+      "type": "object"
+    },
+    "settlement": {
+      "additionalProperties": false,
+      "properties": {
+        "exactTransferCount": {
+          "minimum": 0,
+          "type": "integer"
+        },
+        "observed": {
+          "anyOf": [
+            {
+              "additionalProperties": false,
+              "properties": {
+                "amountAtomic": {
+                  "type": "string"
+                },
+                "amountUsdc": {
+                  "type": "string"
+                },
+                "payer": {
+                  "type": "string"
+                },
+                "recipient": {
+                  "type": "string"
+                }
+              },
+              "required": [
+                "payer",
+                "recipient",
+                "amountAtomic",
+                "amountUsdc"
+              ],
+              "type": "object"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "recipientTransferCount": {
+          "minimum": 0,
+          "type": "integer"
+        },
+        "verified": {
+          "type": "boolean"
+        }
+      },
+      "required": [
+        "verified",
+        "exactTransferCount",
+        "recipientTransferCount"
+      ],
+      "type": "object"
+    },
+    "transaction": {
+      "additionalProperties": false,
+      "properties": {
+        "blockNumber": {
+          "type": "string"
+        },
+        "blockTimestamp": {
+          "anyOf": [
+            {
+              "format": "date-time",
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ]
+        },
+        "hash": {
+          "type": "string"
+        },
+        "status": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "hash",
+        "status"
+      ],
+      "type": "object"
+    },
+    "version": {
+      "const": "1.0.0",
+      "type": "string"
+    }
+  },
+  "required": [
+    "ok",
+    "product",
+    "version",
+    "checkedAt",
+    "decision",
+    "request",
+    "chain",
+    "asset",
+    "transaction",
+    "settlement",
+    "findings",
+    "boundary"
+  ],
+  "type": "object"
+}

AddedAug 11, 2026

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