Roundhouse

402xAgent

402xAgent: probe of a public URL (blocks private, loopback and link-local addresses on every redirect hop) for an x402 PAYMENT-REQUIRED challenge. Never pays the target. $0.02 USDC on Base after 5 free checks per UTC day.

OtherLiveeip155:8453Exactvia cdp
https://api.402xagent.com/v1/products/endpoint-spot-check
x402402xagentPre-payment-checkProbeCatalog
Settlements · 30d
15↑ 67%
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$1.24
Verified settled volume
15 settlements proven x402 by their on-chain EIP-3009 marker.
$0.020
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 2026-10-24 17:56Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x37cfCC8a29e9ff9458902B29E31E42dc7B718674

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.

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "docs": "https://api.402xagent.com/v1/products/endpoint-spot-check/docs",
  "hint": "Missing \"url\". Example: https://api.402xagent.com/v1/products/endpoint-spot-check?url=https://example.com/api/paid (or POST JSON {\"url\":\"https://example.com/api/paid\"} to https://api.402xagent.com/v1/products/endpoint-spot-check)",
  "asset": "USDC on Base (eip155:8453)",
  "error": "Missing url. Add ?url=<x402 endpoint> (or POST JSON {\"url\": ...}) to run a check. The free check (5/day, resets 00:00 UTC) is https://api.402xagent.com/v1/products/endpoint-spot-check?url=<endpoint>; a free dry run works now: add &mode=dry-run.",
  "field": "url",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x37cfCC8a29e9ff9458902B29E31E42dc7B718674",
      "amount": "20000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "example": "https://api.402xagent.com/v1/products/endpoint-spot-check?url=https://example.com/api/paid",
  "pricing": "flat $0.02 USDC per check (any target price)",
  "product": "endpoint-spot-check",
  "resource": {
    "url": "https://api.402xagent.com/v1/products/endpoint-spot-check",
    "tags": [
      "x402",
      "402xagent",
      "pre-payment-check",
      "probe",
      "catalog",
      "agents"
    ],
    "mimeType": "application/json",
    "description": "402xAgent: probe of a public URL (blocks private, loopback and link-local addresses on every redirect hop) for an x402 PAYMENT-REQUIRED challenge. Never pays the target. $0.02 USDC on Base after 5 free checks per UTC day.",
    "serviceName": "402xAgent"
  },
  "discovery": true,
  "price_usd": "0.02",
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "url": "https://x402.example.com/api",
            "client": "agent",
            "claimed_price": "0.001"
          }
        },
        "output": {
          "docs": "https://api.402xagent.com/v1/products/endpoint-spot-check/docs",
          "type": "json"
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET",
                  "POST"
                ],
                "type": "string"
              },
              "headers": {
                "type": "object",
                "additionalProperties": {
                  "type": "string"
                }
              },
              "queryParams": {
                "type": "object",
                "properties": {
                  "ref": {
                    "type": "string"
                  },
                  "url": {
                    "type": "string"
                  },
                  "mode": {
                    "enum": [
                      "live",
                      "dry-run"
                    ],
                    "type": "string"
                  },
                  "task": {
                    "type": "string"
                  },
                  "client": {
                    "type": "string"
                  },
                  "method": {
                    "enum": [
                      "GET",
                      "POST"
                    ],
                    "type": "string"
                  },
                  "pay_to": {
                    "type": "string"
                  },
                  "network": {
                    "type": "string"
                  },
                  "claimed_price": {
                    "type": "string"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "docs": {
                "type": "string"
              },
              "type": {
                "type": "string"
              }
            }
          }
        }
      }
    }
  },
  "free_check": {
    "url": "https://api.402xagent.com/v1/products/endpoint-spot-check?url=<endpoint>",
    "free": "5 checks per client per UTC day (at most 25 per network), plus free dry runs (&mode=dry-run). No payment, no key.",
    "then": "the paid check (HTTP 402, $0.02 USDC on Base) only for the full payment terms",
    "example": "https://api.402xagent.com/v1/products/endpoint-spot-check?url=https://api.402rates.com/v1/ping",
    "dry_run_now": "https://api.402xagent.com/v1/products/endpoint-spot-check?url=<endpoint>&mode=dry-run",
    "prior_checks": "https://402xagent.com/v1/skips",
    "example_response": {
      "reason": "listed $0.001, payment request matches the listed price",
      "verdict": "pay",
      "receipt_url": "https://402xagent.com/v1/receipts/sc-1373dc485641b938"
    }
  },
  "how_to_pay": "Retry the same request with a PAYMENT-SIGNATURE header (x402 v2; X-PAYMENT is also accepted) holding a signed USDC EIP-3009 authorization for the amount and payTo above.",
  "free_resets": "00:00 UTC",
  "x402Version": 2,
  "free_per_day": 5,
  "free_used_today": 0
}

Accepts

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

0.02USDC≈ $0.02 USD
on Base · exact scheme

Pay 0.02 USDC on Base to 0x37cf…18674. The signed payment is good for 5 minutes.

Paid to
0x37cf…18674
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
20000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x37cfCC8a29e9ff9458902B29E31E42dc7B718674",
    "amount": "20000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "url": "https://x402.example.com/api",
          "client": "agent",
          "claimed_price": "0.001"
        }
      },
      "output": {
        "docs": "https://api.402xagent.com/v1/products/endpoint-spot-check/docs",
        "type": "json"
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method"
          ],
          "properties": {
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "GET",
                "POST"
              ],
              "type": "string"
            },
            "headers": {
              "type": "object",
              "additionalProperties": {
                "type": "string"
              }
            },
            "queryParams": {
              "type": "object",
              "properties": {
                "ref": {
                  "type": "string"
                },
                "url": {
                  "type": "string"
                },
                "mode": {
                  "enum": [
                    "live",
                    "dry-run"
                  ],
                  "type": "string"
                },
                "task": {
                  "type": "string"
                },
                "client": {
                  "type": "string"
                },
                "method": {
                  "enum": [
                    "GET",
                    "POST"
                  ],
                  "type": "string"
                },
                "pay_to": {
                  "type": "string"
                },
                "network": {
                  "type": "string"
                },
                "claimed_price": {
                  "type": "string"
                }
              }
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "docs": {
              "type": "string"
            },
            "type": {
              "type": "string"
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-10-24 17:56Z
Last indexed by Roundhouse
2026-10-26 22:40Z
Last enriched (probe, favicon, geo)
2026-10-24 22:16Z
x402 version
2
Max timeout
300s
Liveness probe
HTTP 402
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 402xAgent 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=402xAgent'
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.402xagent.com/v1/products/endpoint-spot-check, 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.