Roundhouse

TraceFast

TraceFast live Ethereum data: every EIP-7702 authorization-list entry carried by the transactions of one block — the delegation target, the chain id and nonce it was signed for, and the signature — in transaction order and then list order. Path number: Block height. Query limit: 1..=100, default 25; cursor: `nextCursor` of the previous page. Docs: https://docs.tracefast.xyz/api/block-authorizations.md

TradingLiveeip155:8453Exactvia cdp
https://mpp.tracefast.xyz/api/v1/chains/1/blocks/:number/authorizations
BlockchainEthereumAddress-intelligenceLabelsEntities
Calls · 30d
1→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 32 snapshots so far.
$6.40
Verified settled volume
113 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 2026-10-01 12:34Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x2A65491E93Ad0d484b74405401A38e2E0E5EDd7e

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.

0.02USDC≈ $0.02 USD
on Base · exact scheme

Pay 0.02 USDC on Base to 0x2A65…EDd7e. The signed payment is good for 5 minutes.

Paid to
0x2A65…EDd7e
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",
      "assetTransferMethod": "eip3009"
    },
    "payTo": "0x2A65491E93Ad0d484b74405401A38e2E0E5EDd7e",
    "amount": "20000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "pathParams": {
          "number": "25000000"
        },
        "queryParams": {
          "limit": "10"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "data": {
            "blockNumber": 25000000,
            "authorizations": [
              {
                "r": "0x0bf5762b98b93f6f5ea1152ba9b52064c1b408482a185c321b00d0e306f8a070",
                "s": "0x337166c754845f3265eeb084639ef51f50c57cc54571c7c361733f520be859ea",
                "index": 0,
                "nonce": 347,
                "address": "0x0000000000000000000000000000000000000000",
                "chainId": 1,
                "yParity": 1,
                "txNumber": 3438274450
              }
            ]
          }
        }
      }
    },
    "schema": {
      "properties": {
        "input": {
          "required": [
            "method"
          ],
          "properties": {
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "pathParams": {
              "type": "object"
            }
          }
        }
      }
    },
    "routeTemplate": "/api/v1/chains/1/blocks/:number/authorizations"
  }
}

Provenance

Seen in the source catalog
2026-10-01 12:34Z
Last indexed by Roundhouse
2026-10-26 17:50Z
Last enriched (probe, favicon, geo)
2026-10-01 13:45Z
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. 32 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 TraceFast 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=TraceFast'
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://mpp.tracefast.xyz/api/v1/chains/1/blocks/:number/authorizations, 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.