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x402-data-gateway

by io.github.epistemedeus

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.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlYesExact 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.
catalogNoOptional 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
NameRequiredDescriptionDefault
okYes
offersYes
parityYes
targetYes
productYes
versionYes
boundaryYes
decisionYes
findingsYes
checkedAtYes
protocolsYes
offerCountYes
catalogCoherenceYes
responseContractYes
responseContractAcquisitionYes

Schema Changelog

Changes observed during successful MCP inspections. Dates show when Glama detected each change.

  1. Changed1 schema field changed
    • 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"
+}
  2. Changed1 schema field changed
    • 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."
  3. Changed1 schema field changed
    • 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"
+}
  4. Added

TDQS

A5/5.0
Behavior5/5

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

With no annotations provided, the description fully discloses behavioral traits: it uses no target credential/signature/payment, follows no redirects, never reads the paid target body, and only reads a same-origin public OpenAPI document under a strict size cap. It also clearly warns that seller declarations are advisory and not proof of validity/trust/reliability.

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

Conciseness5/5

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

Though dense, every sentence carries critical information: purpose, usage contrast, safe-operation boundary, and advisory nature. It is front-loaded with the core action and then systematically covers constraints. No fluff or repetition.

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?

The description is fully sufficient for an agent to understand the tool's scope, limitations, and input expectations. It addresses all key aspects: exact route requirement, comparison dimensions, safety guarantees, and the advisory nature of results. The presence of an output schema further reduces the need to explain return values, and the description still outlines what evidence is gathered.

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

Parameters5/5

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

Schema coverage is 100%, and the description adds substantial meaning beyond the schema. For the url parameter, it explains that the route's unpaid challenge headers and OpenAPI declaration will be inspected. For the catalog parameter, it details exactly how the comparison is performed (across request, protocol, amount, network, asset, recipient, and expiry). This goes well beyond the raw schema descriptions.

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 description states a specific verb ('Compare') and resource ('x402 and MPP payment challenges, terms, and seller-declared JSON success-response readiness') for a precise target (one exact public HTTPS GET route). It clearly distinguishes itself from siblings by explicitly naming agent_discoverability_audit as the alternative when catalog ranking/exposure is needed.

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?

The description explicitly states when to use this tool ('before buyer authorization'), what it covers (URL/realm binding, expiry, parity, OpenAPI evidence), and when not to use it (explicitly directing to agent_discoverability_audit for the alternative use case). It also clarifies what the tool does not do (no credentials, no redirects, no reading paid body).

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

All x402-data-gateway toolsInspect
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TDQS

A4.1/5.0
Disambiguation3/5

Several tools cluster around the same domain: there are multiple audit tools, multiple preflight tools, multiple receipt/settlement tools, and two wallet-policy-conformance tools. The descriptions are carefully distinguished with 'use X instead' notes, but an agent would still need to read closely to separate `agent_discoverability_audit` from `agent_surface_budget_audit` and `seller_integrity_audit` from `payment_offer_preflight`.

Naming Consistency4/5

Most names follow a readable, snake_case pattern with a domain prefix or action stem, such as `morpho_position`, `transaction_receipt`, `wallet_enrich`, and `contract_qualified_search`. The convention is not fully uniform—`read`, `extract`, `scan`, and `schemaforge` are standalone verbs or compounds, and `agent_surface_budget_audit` is a much longer construction—but the style is consistent enough to navigate.

Tool Count3/5

22 tools is at the heavy end of a data-gateway scope, especially since they spread across x402 discovery, Morpho lending, web domain audits, wallet policy, and blockchain receipts. Each tool explains its existence, but the set feels broader than one central data-gateway concern.

Completeness4/5

The tools form a coherent read-only x402/agent-commerce lifecycle: catalog search, discoverability, surface/seller integrity, payment offer preflight, settlement proof, and transaction receipt verification. There are some peripheral tools that do not directly serve x402, and no payment or execution action exists, but the read-only audit gate is intentionally complete and lacks dead ends.

Resources