Roundhouse

stall-row

Change detection for anything with a URL, built for monitoring loops: probe one x402 resource or web page WITHOUT paying it and answer BASELINE, UNCHANGED, or CHANGED with a field-by-field diff (price, asset, payTo, schema, page body) against the last check for that watch. Use this when an agent runs on a schedule and needs to know what changed before spending money or attention. Watch state is per-deployment; a redeploy re-baselines.

TradingUnknowneip155:8453Exactvia facilitator:payAI
https://stall-row-production.up.railway.app/v1/recheck
Monitoringx402Change-detectionDiffAgents
Calls · 30d
7
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 4 snapshots so far.
$12.06
Verified settled volume
156 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0050
Listed price
As published in the catalog. Always read the live 402 before paying.
—
Calls · 30d
Upstream's own call count for this endpoint, not ours.
—
Unique payers · 30d
Never called
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x097f9685D1e0752bF8B02d61E5Ce9be7eA0FBA7F

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.

0.005USDC≈ $0.005 USD
on Base · exact scheme

Pay 0.005 USDC on Base to 0x097f…FBA7F. The signed payment is good for 5 minutes.

Paid to
0x097f…FBA7F
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
5000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x097f9685D1e0752bF8B02d61E5Ce9be7eA0FBA7F",
    "amount": "5000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "url": "https://token-verdict-production.up.railway.app/v1/verdict",
          "watch_id": "token-verdict-main"
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "schema": {
          "type": "object",
          "required": [
            "watch_id",
            "url",
            "kind",
            "status",
            "changes",
            "current",
            "checked_at",
            "summary"
          ],
          "properties": {
            "url": {
              "type": "string"
            },
            "kind": {
              "enum": [
                "x402",
                "web"
              ],
              "type": "string"
            },
            "status": {
              "enum": [
                "BASELINE",
                "UNCHANGED",
                "CHANGED"
              ],
              "type": "string"
            },
            "changes": {
              "type": "array",
              "items": {
                "type": "object",
                "required": [
                  "field",
                  "before",
                  "after"
                ],
                "properties": {
                  "after": {
                    "type": [
                      "string",
                      "integer",
                      "null"
                    ]
                  },
                  "field": {
                    "type": "string"
                  },
                  "before": {
                    "type": [
                      "string",
                      "integer",
                      "null"
                    ]
                  }
                }
              }
            },
            "current": {
              "type": "object"
            },
            "summary": {
              "type": "string"
            },
            "watch_id": {
              "type": "string"
            },
            "checked_at": {
              "type": "string"
            }
          }
        },
        "example": {
          "url": "https://token-verdict-production.up.railway.app/v1/verdict",
          "kind": "x402",
          "status": "CHANGED",
          "changes": [
            {
              "after": "25000",
              "field": "amount",
              "before": "20000"
            }
          ],
          "current": {
            "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
            "payTo": "0x097f9685D1e0752bF8B02d61E5Ce9be7eA0FBA7F",
            "amount": "25000",
            "network": "eip155:8453",
            "schema_hash": "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb",
            "status_code": 402,
            "description_hash": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
          },
          "summary": "Changed since the previous check: amount.",
          "watch_id": "token-verdict-main",
          "checked_at": "2026-10-24T16:00:00Z"
        }
      }
    },
    "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": [
                "url"
              ],
              "properties": {
                "url": {
                  "type": "string"
                },
                "watch_id": {
                  "type": "string"
                }
              }
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "POST",
                "PUT",
                "PATCH"
              ],
              "type": "string"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "schema": {
              "type": "object"
            },
            "example": {
              "type": "object",
              "required": [
                "watch_id",
                "url",
                "kind",
                "status",
                "changes",
                "current",
                "checked_at",
                "summary"
              ],
              "properties": {
                "url": {
                  "type": "string"
                },
                "kind": {
                  "enum": [
                    "x402",
                    "web"
                  ],
                  "type": "string"
                },
                "status": {
                  "enum": [
                    "BASELINE",
                    "UNCHANGED",
                    "CHANGED"
                  ],
                  "type": "string"
                },
                "changes": {
                  "type": "array",
                  "items": {
                    "type": "object",
                    "required": [
                      "field",
                      "before",
                      "after"
                    ],
                    "properties": {
                      "after": {
                        "type": [
                          "string",
                          "integer",
                          "null"
                        ]
                      },
                      "field": {
                        "type": "string"
                      },
                      "before": {
                        "type": [
                          "string",
                          "integer",
                          "null"
                        ]
                      }
                    }
                  }
                },
                "current": {
                  "type": "object"
                },
                "summary": {
                  "type": "string"
                },
                "watch_id": {
                  "type": "string"
                },
                "checked_at": {
                  "type": "string"
                }
              }
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-10-24 20:36Z
Last indexed by Roundhouse
2026-10-26 20:46Z
Last enriched (probe, favicon, geo)
—
x402 version
2
Max timeout
300s
Liveness probe
Not probed
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

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 4 snapshots so far. 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 stall-row 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=stall-row'
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://stall-row-production.up.railway.app/v1/recheck, 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.