Roundhouse

Base

Base on-chain read: a contract's event logs, filtered by topic and block range. Event logs on Base: takes address (contract, 0x + 40 hex), optional topic0 (event signature hash, 0x + 64 hex) and optional blocks (last N blocks, 1-100, default 10), and returns the matching eth_getLogs entries.

DataLiveeip155:8453Exactvia cdp
https://api.arysphere.com/v1/ventures/x402_chain_reads_v1/base_eth_getlogs
RpcOnchain-dataBase
Calls · 30d
3
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 11 snapshots so far.
$1.00
Verified settled volume
275 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0030
Listed price
As published in the catalog. Always read the live 402 before paying.
3
Calls · 30d
Upstream's own call count for this endpoint, not ours.
2
Unique payers · 30d
Last called 2026-10-18 10:05Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xBF324F1F5b648a67905A86aF3E1093C667EAa035

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.

{
  "error": "payment required: retry with a PAYMENT-SIGNATURE header built from one of `accepts`"
}

Accepts

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

0.003USDC≈ $0.003 USD
on Base · exact scheme

Pay 0.003 USDC on Base to 0xBF32…Aa035. The signed payment is good for 1 minute.

Paid to
0xBF32…Aa035
USD Coin contract
0x8335…02913
Payment window
1 minute
As published
3000 smallest units
3000units
on Polygon · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to
0xBF32…Aa035
Token contract
0x3c49…c3359
Payment window
1 minute
3000units
on Arbitrum · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to
0xBF32…Aa035
Token contract
0xaf88…e5831
Payment window
1 minute
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xBF324F1F5b648a67905A86aF3E1093C667EAa035",
    "amount": "3000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 60
  },
  {
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xBF324F1F5b648a67905A86aF3E1093C667EAa035",
    "amount": "3000",
    "scheme": "exact",
    "network": "eip155:137",
    "maxTimeoutSeconds": 60
  },
  {
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xBF324F1F5b648a67905A86aF3E1093C667EAa035",
    "amount": "3000",
    "scheme": "exact",
    "network": "eip155:42161",
    "maxTimeoutSeconds": 60
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "blocks": "10",
          "topic0": "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
          "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "ok": true,
          "chain": "base",
          "method": "eth_getLogs",
          "result": {
            "logs": [
              {
                "data": "0x000000000000000000000000000000000000000000000000000000046059f24b",
                "topics": [
                  "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
                  "0x000000000000000000000000b2cc224c1c9fee385f8ad6a55b4d94e92359dc59",
                  ""
                ],
                "address": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
                "removed": false,
                "logIndex": "0x0",
                "blockHash": "0x070a9affe2a28d7cf48692cf3b39420a699e6e2c5549fcd351143931a329400f",
                "blockNumber": "0x31f549f",
                "blockTimestamp": "0x6ac90621",
                "transactionHash": "0xd6acc3445213c7bb13fafe113c818965d71567c3a8d0defdba730577e0f4c85d",
                "transactionIndex": "0x1"
              },
              {
                "data": "0x00000000000000000000000000000000000000000000000000000001b91d1bf1",
                "topics": [
                  "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
                  "0x000000000000000000000000160d7e9d948b16c163332a277b393c288408eb12",
                  ""
                ],
                "address": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
                "removed": false,
                "logIndex": "0x3",
                "blockHash": "0x070a9affe2a28d7cf48692cf3b39420a699e6e2c5549fcd351143931a329400f",
                "blockNumber": "0x31f549f",
                "blockTimestamp": "0x6ac90621",
                "transactionHash": "0x871c536d6987ca7ac859231108c11b5604874b55a50b9ed063bc55d1add86142",
                "transactionIndex": "0x3"
              },
              ""
            ],
            "count": 205,
            "to_block": 52384927,
            "truncated": true,
            "from_block": 52384927
          },
          "service": "x402_chain_reads_v1.base_eth_getlogs"
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method"
          ],
          "properties": {
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "GET",
                "HEAD",
                "DELETE"
              ],
              "type": "string"
            },
            "queryParams": {
              "type": "object",
              "properties": {
                "blocks": {
                  "type": "string",
                  "description": "optional, last N blocks, 1-100 (default 10)"
                },
                "topic0": {
                  "type": "string",
                  "description": "optional event signature hash, 0x + 64 hex"
                },
                "address": {
                  "type": "string",
                  "pattern": "^0x[0-9a-fA-F]{40}$",
                  "description": "contract, 0x + 40 hex"
                }
              }
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object"
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-10-18 10:05Z
Last indexed by Roundhouse
2026-10-24 00:20Z
Last enriched (probe, favicon, geo)
2026-10-17 02:45Z
x402 version
2
Max timeout
60s
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. 11 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 Base 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=Base'
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.arysphere.com/v1/ventures/x402_chain_reads_v1/base_eth_getlogs, 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.