Roundhouse

horizonpulse.dev

Seller due-diligence for one x402 endpoint. We make a real capped test payment, check the paid response against the listed schema, compare payTo with the CDP listing, read a recent window of on-chain USDC payments to the payTo and screen for lookalike addresses. Returns a signed JSON verdict of evidenced facts. No charge unless the test payment and all 4 other checks complete. Facts, not endorsement; no warranty. Not affiliated with the seller checked. $5.

OtherLiveeip155:8453Exactvia cdp
https://horizonpulse.dev/api/seller-dd/single
Calls · 30d
1
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 3 snapshots so far.
$60.19
Verified settled volume
263 settlements proven x402 by their on-chain EIP-3009 marker.
$5.00
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 2026-10-23 20:15Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x5b32c973596078a967562ca652761404f19be0e9

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.

{
  "notice": "Technical facts as observed at checked_at, with evidence. Not an endorsement, rating, recommendation or warranty. Horizon Pulse is not affiliated with the seller checked. Not financial advice. Disputes or corrections: horizonpulse.co@proton.me.",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x5b32c973596078a967562ca652761404f19be0e9",
      "amount": "5000000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://horizonpulse.dev/api/seller-dd/single",
    "terms": "https://horizonpulse.dev/premium-terms",
    "mimeType": "application/json",
    "description": "Seller due-diligence for one x402 endpoint. We make a real capped test payment, check the paid response against the listed schema, compare payTo with the CDP listing, read a recent window of on-chain USDC payments to the payTo and screen for lookalike addresses. Returns a signed JSON verdict of evidenced facts. No charge unless the test payment and all 4 other checks complete. Facts, not endorsement; no warranty. Not affiliated with the seller checked. $5."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "resource": "https://example.com/api/paid",
            "expected_payTo": null
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        },
        "output": {
          "type": "json",
          "example": {
            "v": 1,
            "id": "dd_<id>",
            "checks": [
              {
                "name": "402_parse",
                "note": "<what was observed>",
                "state": "pass",
                "result": "ok"
              }
            ],
            "notice": "Technical facts as observed at checked_at, with evidence. Not an endorsement, rating, recommendation or warranty. Horizon Pulse is not affiliated with the seller checked. Not financial advice. Disputes or corrections: horizonpulse.co@proton.me.",
            "status": "delivered",
            "charged": true,
            "resource": "https://<seller host>/<path>",
            "checked_at": "<ISO 8601 time>",
            "checks_run": [
              "402_parse",
              "test_pay",
              "schema_match",
              "payTo_continuity",
              "history_and_lookalike"
            ],
            "completeness": "complete",
            "missing_checks": []
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method",
              "bodyType",
              "body"
            ],
            "properties": {
              "body": {
                "required": [
                  "resource"
                ],
                "properties": {
                  "resource": {
                    "type": "string",
                    "format": "uri",
                    "maxLength": 2048,
                    "description": "https URL of the x402 endpoint to check (required)."
                  },
                  "expected_payTo": {
                    "type": [
                      "string",
                      "null"
                    ],
                    "description": "Optional EVM address to compare with the endpoint's payTo."
                  }
                }
              },
              "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",
                "description": "Signed JSON verdict of evidenced facts (charged) or a no_charge body (not charged). pass means Horizon Pulse's charge criteria were met; it is not a rating of the seller. The example shows the shape only; seller values are placeholders."
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Accepts

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

5USDC≈ $5 USD
on Base · exact scheme

Pay 5 USDC on Base to 0x5b32…be0e9. The signed payment is good for 5 minutes.

Paid to
0x5b32…be0e9
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
5000000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x5b32c973596078a967562ca652761404f19be0e9",
    "amount": "5000000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "resource": "https://example.com/api/paid",
          "expected_payTo": null
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "v": 1,
          "id": "dd_<id>",
          "checks": [
            {
              "name": "402_parse",
              "note": "<what was observed>",
              "state": "pass",
              "result": "ok"
            }
          ],
          "notice": "Technical facts as observed at checked_at, with evidence. Not an endorsement, rating, recommendation or warranty. Horizon Pulse is not affiliated with the seller checked. Not financial advice. Disputes or corrections: horizonpulse.co@proton.me.",
          "status": "delivered",
          "charged": true,
          "resource": "https://<seller host>/<path>",
          "checked_at": "<ISO 8601 time>",
          "checks_run": [
            "402_parse",
            "test_pay",
            "schema_match",
            "payTo_continuity",
            "history_and_lookalike"
          ],
          "completeness": "complete",
          "missing_checks": []
        }
      }
    },
    "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": {
              "required": [
                "resource"
              ],
              "properties": {
                "resource": {
                  "type": "string",
                  "format": "uri",
                  "maxLength": 2048,
                  "description": "https URL of the x402 endpoint to check (required)."
                },
                "expected_payTo": {
                  "type": [
                    "string",
                    "null"
                  ],
                  "description": "Optional EVM address to compare with the endpoint's payTo."
                }
              }
            },
            "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",
              "description": "Signed JSON verdict of evidenced facts (charged) or a no_charge body (not charged). pass means Horizon Pulse's charge criteria were met; it is not a rating of the seller. The example shows the shape only; seller values are placeholders."
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-10-23 20:15Z
Last indexed by Roundhouse
2026-10-26 20:30Z
Last enriched (probe, favicon, geo)
2026-10-24 00:46Z
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

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 3 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 horizonpulse.dev 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=horizonpulse.dev'
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://horizonpulse.dev/api/seller-dd/single, 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.