x402-data-gateway

Preflight x402 and MPP Offer

payment_offer_preflight

Compare x402 and MPP payment challenges, terms, and seller-declared JSON success-response readiness for one exact public HTTPS GET route before buyer authorization, including URL and realm binding, expiry, cross-protocol economic parity, and exact-route OpenAPI evidence. Use agent_discoverability_audit instead when you need to know whether catalogs rank or expose a service. This tool uses no target credential, signature, or target payment, follows no redirect, never reads the paid target body, and reads only the same-origin public OpenAPI document under a strict size cap. A seller declaration is advisory and does not establish runtime validity, seller trust, utility, or settlement reliability. Payment challenge and credentials are bound to GET https://agents.samedaydesk.com/commerce/payment-offer-preflight, not mcp://. Retry the identical authorized arguments and credential.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`url`	Yes	Exact public HTTPS GET route whose unpaid x402 and MPP challenge headers and same-origin OpenAPI success-response declaration should be inspected before buyer authorization. Credential-like query keys, fragments, unresolved parameters, local hosts, redirects, and non-public IPs are rejected.
`catalog`	No	Optional caller-supplied catalog candidate. When present, the tool compares it with every live unsigned offer across request, protocol, amount, network, asset, recipient, and expiry.

Output Schema

TableJSON Schema

Name	Required	Description	Default
`ok`	Yes
`offers`	Yes
`parity`	Yes
`target`	Yes
`product`	Yes
`version`	Yes
`boundary`	Yes
`decision`	Yes
`findings`	Yes
`checkedAt`	Yes
`protocols`	Yes
`offerCount`	Yes
`catalogCoherence`	Yes
`responseContract`	Yes
`responseContractAcquisition`	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": {
+    "boundary": {
+      "additionalProperties": false,
+      "properties": {
+        "claim": {
+          "type": "string"
+        },
+        "credentialsUsed": {
+          "const": false,
+          "type": "boolean"
+        },
+        "openApiDocumentRead": {
+          "type": "boolean"
+        },
+        "paymentSent": {
+          "const": false,
+          "type": "boolean"
+        },
+        "paymentSigned": {
+          "const": false,
+          "type": "boolean"
+        },
+        "redirectsFollowed": {
+          "const": false,
+          "type": "boolean"
+        },
+        "targetResponseBodyRead": {
+          "const": false,
+          "type": "boolean"
+        }
+      },
+      "required": [
+        "credentialsUsed",
+        "paymentSigned",
+        "paymentSent",
+        "targetResponseBodyRead",
+        "openApiDocumentRead",
+        "redirectsFollowed",
+        "claim"
+      ],
+      "type": "object"
+    },
+    "catalogCoherence": {
+      "items": {
+        "additionalProperties": true,
+        "properties": {
+          "decision": {
+            "enum": [
+              "coherent",
+              "partial",
+              "drifted"
+            ],
+            "type": "string"
+          }
+        },
+        "required": [
+          "decision"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "checkedAt": {
+      "format": "date-time",
+      "type": "string"
+    },
+    "decision": {
+      "enum": [
+        "parseable_offer",
+        "review_required",
+        "no_parseable_offer"
+      ],
+      "type": "string"
+    },
+    "findings": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "code": {
+            "type": "string"
+          },
+          "message": {
+            "type": "string"
+          },
+          "severity": {
+            "enum": [
+              "error",
+              "warning"
+            ],
+            "type": "string"
+          }
+        },
+        "required": [
+          "severity",
+          "code",
+          "message"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "offerCount": {
+      "minimum": 0,
+      "type": "integer"
+    },
+    "offers": {
+      "items": {
+        "anyOf": [
+          {
+            "additionalProperties": false,
+            "properties": {
+              "amountAtomic": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "amountDisplay": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "asset": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "decimals": {
+                "anyOf": [
+                  {
+                    "type": "integer"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
+              },
+              "expiresAt": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "intent": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "network": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "protocol": {
+                "const": "x402",
+                "type": "string"
+              },
+              "recipient": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "scheme": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "valid": {
+                "type": "boolean"
+              }
+            },
+            "required": [
+              "protocol",
+              "scheme",
+              "intent",
+              "network",
+              "asset",
+              "amountAtomic",
+              "decimals",
+              "amountDisplay",
+              "recipient",
+              "expiresAt",
+              "valid"
+            ],
+            "type": "object"
+          },
+          {
+            "additionalProperties": false,
+            "properties": {
+              "amountAtomic": {
+                "$ref": "#/properties/offers/items/anyOf/0/properties/amountAtomic"
+              },
+              "amountDisplay": {
+                "$ref": "#/properties/offers/items/anyOf/0/properties/amountDisplay"
+              },
+              "asset": {
+                "$ref": "#/properties/offers/items/anyOf/0/properties/asset"
+              },
+              "credentialTypes": {
+                "items": {
+                  "type": "string"
+                },
+                "type": "array"
+              },
+              "decimals": {
+                "$ref": "#/properties/offers/items/anyOf/0/properties/decimals"
+              },
+              "expiresAt": {
+                "$ref": "#/properties/offers/items/anyOf/0/properties/expiresAt"
+              },
+              "intent": {
+                "$ref": "#/properties/offers/items/anyOf/0/properties/intent"
+              },
+              "network": {
+                "$ref": "#/properties/offers/items/anyOf/0/properties/network"
+              },
+              "protocol": {
+                "const": "mpp",
+                "type": "string"
+              },
+              "realm": {
+                "type": [
+                  "string",
+                  "null"
+                ]
+              },
+              "recipient": {
+                "$ref": "#/properties/offers/items/anyOf/0/properties/recipient"
+              },
+              "scheme": {
+                "$ref": "#/properties/offers/items/anyOf/0/properties/scheme"
+              },
+              "valid": {
+                "$ref": "#/properties/offers/items/anyOf/0/properties/valid"
+              }
+            },
+            "required": [
+              "protocol",
+              "scheme",
+              "intent",
+              "network",
+              "asset",
+              "amountAtomic",
+              "decimals",
+              "amountDisplay",
+              "recipient",
+              "expiresAt",
+              "valid",
+              "realm",
+              "credentialTypes"
+            ],
+            "type": "object"
+          }
+        ]
+      },
+      "type": "array"
+    },
+    "ok": {
+      "const": true,
+      "type": "boolean"
+    },
+    "parity": {
+      "additionalProperties": false,
+      "properties": {
+        "compared": {
+          "type": "boolean"
+        },
+        "consistent": {
+          "type": [
+            "boolean",
+            "null"
+          ]
+        },
+        "driftFields": {
+          "items": {
+            "type": "string"
+          },
+          "type": "array"
+        }
+      },
+      "required": [
+        "compared",
+        "consistent",
+        "driftFields"
+      ],
+      "type": "object"
+    },
+    "product": {
+      "const": "samedaydesk-payment-offer-preflight",
+      "type": "string"
+    },
+    "protocols": {
+      "items": {
+        "enum": [
+          "mpp",
+          "x402"
+        ],
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "responseContract": {
+      "additionalProperties": true,
+      "properties": {
+        "decision": {
+          "enum": [
+            "admissible",
+            "partial",
+            "absent",
+            "invalid"
+          ],
+          "type": "string"
+        }
+      },
+      "required": [
+        "decision"
+      ],
+      "type": "object"
+    },
+    "responseContractAcquisition": {
+      "additionalProperties": false,
+      "properties": {
+        "attempted": {
+          "const": true,
+          "type": "boolean"
+        },
+        "credentialsUsed": {
+          "const": false,
+          "type": "boolean"
+        },
+        "documentRead": {
+          "type": "boolean"
+        },
+        "maxBytes": {
+          "exclusiveMinimum": 0,
+          "type": "integer"
+        },
+        "path": {
+          "const": "/openapi.json",
+          "type": "string"
+        },
+        "redirectsFollowed": {
+          "const": false,
+          "type": "boolean"
+        },
+        "sameOrigin": {
+          "const": true,
+          "type": "boolean"
+        },
+        "targetResponseBodyRead": {
+          "const": false,
+          "type": "boolean"
+        }
+      },
+      "required": [
+        "attempted",
+        "sameOrigin",
+        "path",
+        "maxBytes",
+        "documentRead",
+        "targetResponseBodyRead",
+        "credentialsUsed",
+        "redirectsFollowed"
+      ],
+      "type": "object"
+    },
+    "target": {
+      "additionalProperties": false,
+      "properties": {
+        "httpStatus": {
+          "type": "integer"
+        },
+        "method": {
+          "const": "GET",
+          "type": "string"
+        },
+        "url": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "method",
+        "url",
+        "httpStatus"
+      ],
+      "type": "object"
+    },
+    "version": {
+      "const": "1.2.0",
+      "type": "string"
+    }
+  },
+  "required": [
+    "ok",
+    "product",
+    "version",
+    "checkedAt",
+    "target",
+    "decision",
+    "protocols",
+    "offerCount",
+    "offers",
+    "parity",
+    "catalogCoherence",
+    "responseContract",
+    "responseContractAcquisition",
+    "findings",
+    "boundary"
+  ],
+  "type": "object"
+}

Changed1 schema field changedAug 12, 2026

changedInput schema / properties / url / description

Previous value: -"Exact public HTTPS GET route whose unpaid x402 and MPP challenge headers should be inspected before buyer authorization. Credential-like query keys, fragments, unresolved parameters, local hosts, redirects, and non-public IPs are rejected."New value: +"Exact public HTTPS GET route whose unpaid x402 and MPP challenge headers and same-origin OpenAPI success-response declaration should be inspected before buyer authorization. Credential-like query keys, fragments, unresolved parameters, local hosts, redirects, and non-public IPs are rejected."

Changed1 schema field changedAug 12, 2026

addedInput schema / properties / catalog

Added value: +{
+  "additionalProperties": false,
+  "description": "Optional caller-supplied catalog candidate. When present, the tool compares it with every live unsigned offer across request, protocol, amount, network, asset, recipient, and expiry.",
+  "properties": {
+    "amountAtomic": {
+      "description": "Optional advertised price in atomic currency units.",
+      "pattern": "^(?:0|[1-9][0-9]{0,77})$",
+      "type": "string"
+    },
+    "asset": {
+      "description": "Optional advertised currency or asset identifier.",
+      "maxLength": 200,
+      "minLength": 1,
+      "type": "string"
+    },
+    "expiresAt": {
+      "description": "Optional advertised offer expiry.",
+      "format": "date-time",
+      "type": "string"
+    },
+    "method": {
+      "const": "GET",
+      "description": "Catalog request method. The current product inspects exact GET routes.",
+      "type": "string"
+    },
+    "network": {
+      "description": "Optional advertised network identifier.",
+      "maxLength": 200,
+      "minLength": 1,
+      "type": "string"
+    },
+    "protocol": {
+      "description": "Optional advertised payment protocol.",
+      "enum": [
+        "x402",
+        "mpp"
+      ],
+      "type": "string"
+    },
+    "recipient": {
+      "description": "Optional advertised payment recipient.",
+      "maxLength": 200,
+      "minLength": 1,
+      "type": "string"
+    },
+    "source": {
+      "description": "Public catalog or registry name.",
+      "maxLength": 128,
+      "minLength": 1,
+      "type": "string"
+    },
+    "url": {
+      "description": "Exact catalog candidate URL, including all non-secret query values.",
+      "format": "uri",
+      "maxLength": 2048,
+      "type": "string"
+    }
+  },
+  "required": [
+    "source",
+    "method",
+    "url"
+  ],
+  "type": "object"
+}

AddedAug 10, 2026

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