Roundhouse AI

x402 Heartbeat

20 monetized x402 APIs for AI agents — crypto, DeFi, on-chain data, prediction markets, weather, and web search. No API keys, no signup — pay per call in USDC.

OtherLiveeip155:8453Exactvia cdp
https://x402tap.com/api/ping
HeartbeatMonitoringMicropaymentsBatch-settlement
Calls · 30d
4↑ 3.7%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 30 snapshots so far.
$0.86
Verified settled volume
325 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0010
Listed price
As published in the catalog. Always read the live 402 before paying.
4
Calls · 30d
Upstream's own call count for this endpoint, not ours.
4
Unique payers · 30d
Last called 2026-09-17 03:24Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xB810B599bc730Aa85800BABe7f5d160524322C86

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.

0.001USDC≈ $0.001 USD
on Base · exact scheme

Pay 0.001 USDC on Base to 0xB810…22C86. The signed payment is good for 5 minutes.

Paid to
0xB810…22C86
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
1000 smallest units
0.001USDC≈ $0.001 USD
on Base · batch-settlement scheme

Pay 0.001 USDC on Base to 0xB810…22C86. The signed payment is good for 5 minutes.

Paid to
0xB810…22C86
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
1000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xB810B599bc730Aa85800BABe7f5d160524322C86",
    "amount": "1000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2",
      "withdrawDelay": 3600,
      "receiverAuthorizer": "0xFA9dFa6C94285bdb52aDeFF9d88CC7882911a02b"
    },
    "payTo": "0xB810B599bc730Aa85800BABe7f5d160524322C86",
    "amount": "1000",
    "scheme": "batch-settlement",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {}
      },
      "output": {
        "type": "json",
        "example": {
          "ts": 1700000000000,
          "pong": true
        }
      }
    },
    "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"
              ],
              "type": "string"
            },
            "queryParams": {
              "type": "object",
              "properties": {}
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object"
            }
          }
        }
      }
    }
  },
  "offer-receipt": {
    "info": {
      "offers": [
        {
          "format": "eip712",
          "payload": {
            "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
            "payTo": "0xB810B599bc730Aa85800BABe7f5d160524322C86",
            "amount": "1000",
            "scheme": "exact",
            "network": "eip155:8453",
            "version": 1,
            "validUntil": 1789615744,
            "resourceUrl": "https://x402tap.com/api/ping"
          },
          "signature": "0x14d54ad79cdfb240161f205fe0d9af1de11a11ff88cd79c62ecba11a78075ec345979cc40a5f48d638ef825d5fbf17e27904c47620e53a7376548207ffc561c11b",
          "acceptIndex": 0
        },
        {
          "format": "eip712",
          "payload": {
            "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
            "payTo": "0xB810B599bc730Aa85800BABe7f5d160524322C86",
            "amount": "1000",
            "scheme": "batch-settlement",
            "network": "eip155:8453",
            "version": 1,
            "validUntil": 1789615744,
            "resourceUrl": "https://x402tap.com/api/ping"
          },
          "signature": "0x81a94ca12884b73482ad7a948d3a9d1a76e8077585add312e1032b895aeced72042aafa777cf7a295f6154718bd68514e2bd172ad5d7b8637f998a4403ead9d41c",
          "acceptIndex": 1
        }
      ]
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "offers"
      ],
      "properties": {
        "offers": {
          "type": "array",
          "items": {
            "type": "object",
            "required": [
              "format",
              "signature"
            ],
            "properties": {
              "format": {
                "type": "string"
              },
              "payload": {
                "type": "object",
                "required": [
                  "version",
                  "resourceUrl",
                  "scheme",
                  "network",
                  "asset",
                  "payTo",
                  "amount"
                ],
                "properties": {
                  "asset": {
                    "type": "string"
                  },
                  "payTo": {
                    "type": "string"
                  },
                  "amount": {
                    "type": "string"
                  },
                  "scheme": {
                    "type": "string"
                  },
                  "network": {
                    "type": "string"
                  },
                  "version": {
                    "type": "integer"
                  },
                  "validUntil": {
                    "type": "integer"
                  },
                  "resourceUrl": {
                    "type": "string"
                  }
                }
              },
              "signature": {
                "type": "string"
              },
              "acceptIndex": {
                "type": "integer"
              }
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-09-17 03:24Z
Last indexed by Roundhouse
2026-09-24 14:10Z
Last enriched (probe, favicon, geo)
2026-09-23 22:45Z
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. 30 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 x402 Heartbeat 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%20Heartbeat'
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://x402tap.com/api/ping, 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. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402,
or use an organization key from https://roundhouseai.io/dashboard/team.

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