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

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

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

TDQS

A4.6/5.0

Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries the full burden and does so: it declares read-only scope (public Base receipt and log data only), explicitly disclaims merchant ledger reads and any wallet, signing, broadcast, custody, or execution action, and discloses the credential/URL binding and retry semantics.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loaded with the core action, then routing, then safety constraints, then credential/retry notes. Four dense sentences with little waste, though the credential-binding sentence is somewhat operational detail that could be tighter.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

An output schema exists, so return values need not be explained. The description covers the prerequisites, the read-only safety envelope, the alternative tool, and the retry contract, leaving nothing an agent needs to invoke this correctly.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so the schema already documents payer, recipient, amountAtomic, and transactionHash with patterns. The description mirrors the semantics (exact recipient, atomic amount, optional payer) but adds no format or edge-case detail beyond the schema, so the baseline 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The first sentence gives a precise verb (verify), resource (a claimed canonical Base USDC settlement), and the exact matching criteria (transaction receipt vs. recipient, atomic amount, optional payer). It is clearly distinguishable from siblings like transaction_receipt and payment_offer_preflight.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly states the trigger (after execution, verifying a claimed settlement) and names the alternative for the adjacent case: use payment_offer_preflight before authorization for an unpaid x402 or MPP offer. It also tells the agent what to do on failure: retry the identical authorized arguments and credential.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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