Roundhouse

x402 Binding Audit

Check that every challenge you captured names the endpoint that served it. A challenge naming a different resource would, if paid, satisfy a requirement for something else. A host mismatch is reported differently from a path mismatch, the first being the stronger signal. Also reports a non-https resource and, under version 2, a bare string resource, where a client reading resource.url gets undefined and stops checking the binding. Nothing is fetched and nothing is paid.

Tradingofflineeip155:8453Exactvia cdp
https://api.zfinia.com/x402/v1/x402-resource-binding-audit
x402Machine paymentsResource bindingIntegrityAgent commerce
Settlements · 30d
219↓ 44%
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$25.35
Verified settled volume
256 settlements proven x402 by their on-chain EIP-3009 marker.
$0.120
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-10-04 08:07Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x25e8245f07d5e4873987293dad666afbe56a9608

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.12USDC≈ $0.12 USD
on Base · exact scheme

Pay 0.12 USDC on Base to 0x25e8…a9608. The signed payment is good for 1 minute.

Paid to
0x25e8…a9608
USD Coin contract
0x8335…02913
Payment window
1 minute
As published
120000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x25e8245f07d5e4873987293dad666afbe56a9608",
    "amount": "120000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 60
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "observations": [
            {
              "url": "https://api.merchant.test/v1/score",
              "challenge": {
                "accepts": [
                  {
                    "asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
                    "payTo": "0xa1b2c30000000000000000000000000000009f8e",
                    "amount": "5000",
                    "scheme": "exact",
                    "network": "eip155:8453"
                  }
                ],
                "resource": {
                  "url": "https://api.merchant.test/v1/score",
                  "mimeType": "application/json",
                  "description": "Paid resource at https://api.merchant.test/v1/score"
                },
                "extensions": {
                  "bazaar": {
                    "schema": {
                      "properties": {
                        "input": {
                          "type": "object"
                        },
                        "output": {
                          "type": "object"
                        }
                      }
                    }
                  }
                },
                "x402Version": 2
              }
            },
            {
              "url": "https://api.merchant.test/v1/enrich",
              "challenge": {
                "accepts": [
                  {
                    "asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
                    "payTo": "0xa1b2c30000000000000000000000000000009f8e",
                    "amount": "5000",
                    "scheme": "exact",
                    "network": "eip155:8453"
                  }
                ],
                "resource": {
                  "url": "https://api.merchant.test/v1/score",
                  "mimeType": "application/json",
                  "description": "Paid resource at https://api.merchant.test/v1/score"
                },
                "extensions": {
                  "bazaar": {
                    "schema": {
                      "properties": {
                        "input": {
                          "type": "object"
                        },
                        "output": {
                          "type": "object"
                        }
                      }
                    }
                  }
                },
                "x402Version": 2
              }
            },
            {
              "url": "https://api.merchant.test/v1/hijacked",
              "challenge": {
                "accepts": [
                  {
                    "asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
                    "payTo": "0xffffffffffffffffffffffffffffffffffffffff",
                    "amount": "5000",
                    "scheme": "exact",
                    "network": "eip155:8453"
                  }
                ],
                "resource": "http://collector.elsewhere.test/v1/hijacked",
                "x402Version": 2
              }
            }
          ],
          "expected_host": "api.merchant.test"
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "limits": {
            "maxAssets": 100,
            "maxAccepts": 20,
            "maxFindings": 500,
            "maxNetworks": 50,
            "maxResources": 500,
            "maxChallenges": 200
          },
          "passed": false,
          "complete": true,
          "findings": [
            {
              "url": "https://api.merchant.test/v1/enrich",
              "code": "RESOURCE_PATH_DIFFERS",
              "detail": "https://api.merchant.test/v1/enrich served a challenge naming https://api.merchant.test/v1/score. Paying it would satisfy a requirement for a different resource.",
              "challenge": 1,
              "declared_resource": "https://api.merchant.test/v1/score"
            },
            {
              "url": "https://api.merchant.test/v1/hijacked",
              "code": "RESOURCE_HOST_DIFFERS",
              "detail": "https://api.merchant.test/v1/hijacked served a challenge naming http://collector.elsewhere.test/v1/hijacked, which is a different host entirely. Paying it would satisfy a requirement for a different r...",
              "challenge": 2,
              "declared_resource": "http://collector.elsewhere.test/v1/hijacked"
            },
            {
              "url": "https://api.merchant.test/v1/hijacked",
              "code": "RESOURCE_NOT_HTTPS",
              "detail": "http://collector.elsewhere.test/v1/hijacked is not an https URL, so the requirement is not transport protected.",
              "challenge": 2
            }
          ],
          "all_bound": false,
          "request_id": "example-request",
          "service_id": "x402_resource_binding_audit",
          "assumptions": [
            "Nothing is fetched and nothing is paid. Each observation is a URL the caller probed and the challenge it received.",
            "A mismatch on the host is reported differently from a mismatch on the path, because the first is a stronger signal that the challenge did not come from where it claims.",
            "x402 version 2 carries the resource as an object. A bare string under version 2 is named, because a client reading resource.url against a string gets undefined and silently stops checking the binding."
          ],
          "bound_count": 1,
          "limitations": [
            "Binding between each supplied URL and the challenge supplied with it. Whether the challenge genuinely came from that URL rests on the caller having captured it correctly.",
            "all_bound is true only when every observation decoded and every declared resource matched the URL it was served from."
          ],
          "observed_at": "2026-10-02T00:00:00.000Z",
          "not_examined": [],
          "observations": [
            {
              "verdict": "bound",
              "version": 2,
              "probed_url": "https://api.merchant.test/v1/score",
              "declared_resource": "https://api.merchant.test/v1/score",
              "resource_is_object": true
            },
            {
              "verdict": "mismatched",
              "version": 2,
              "probed_url": "https://api.merchant.test/v1/enrich",
              "declared_resource": "https://api.merchant.test/v1/score",
              "resource_is_object": true
            },
            {
              "verdict": "mismatched",
              "version": 2,
              "probed_url": "https://api.merchant.test/v1/hijacked",
              "declared_resource": "http://collector.elsewhere.test/v1/hijacked",
              "resource_is_object": false
            }
          ],
          "payment_sent": false,
          "finding_count": 5,
          "service_version": "1.0.0",
          "findings_by_code": {
            "RESOURCE_NOT_HTTPS": 1,
            "RESOURCE_HOST_DIFFERS": 1,
            "RESOURCE_PATH_DIFFERS": 1,
            "RESOURCE_NOT_AN_OBJECT": 1,
            "RESOURCE_HOST_UNEXPECTED": 1
          },
          "examined_observation_count": 3,
          "supplied_observation_count": 3
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "properties": {
            "body": {
              "type": "object",
              "required": [
                "observations"
              ],
              "properties": {
                "observations": {
                  "type": "array",
                  "items": {
                    "type": "object",
                    "required": [
                      "url",
                      "challenge"
                    ],
                    "properties": {
                      "url": {
                        "type": "string",
                        "maxLength": 2048
                      },
                      "challenge": {}
                    },
                    "additionalProperties": false
                  },
                  "maxItems": 200,
                  "minItems": 1
                },
                "expected_host": {
                  "type": "string",
                  "maxLength": 256
                },
                "require_https": {
                  "type": "boolean"
                }
              },
              "additionalProperties": false
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "type": "string"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object"
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-10-04 08:07Z
Last indexed by Roundhouse
2026-10-05 00:20Z
Last enriched (probe, favicon, geo)
2026-10-04 11:15Z
x402 version
2
Max timeout
60s
Liveness probe
HTTP 0
Report

Hand this page to an agent

Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.

GET api.roundhouseai.io/v0/endpoints

No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md
Show the prompt
Using Roundhouse, look up the x402 service x402 Binding Audit and tell me whether it is
worth paying: what a call costs, whether the endpoint answered when last probed, and what
its payment record actually shows.

curl -s 'https://api.roundhouseai.io/v0/endpoints?q=x402%20Binding%20Audit'
curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>'

Then call it: read the price from the live 402 at https://api.zfinia.com/x402/v1/x402-resource-binding-audit, never from
a cached figure, and pay with an x402 client.

The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except
/v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at
GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at
https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.