Roundhouse

api.relai.fi

Returns current gas price estimates for a specified blockchain via Relai's paid relay endpoint.

TradingLiveeip155:8453Exactvia facilitator:dexter
https://api.relai.fi/relay/1772442473781/v4/%7Bchain%7D/gasPrice
Activity
—
Nothing indexed for this service or its provider yet. Not a claim that it is unused — only that we hold no record.
$0.01
Verified settled volume
1 settlements proven x402 by their on-chain EIP-3009 marker.
$0.010
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
0xe9987a0e13b77b129b8de29654cb5ce93c4ee276

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",
  "accepts": [
    {
      "asset": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
      "extra": {
        "name": "USD Coin",
        "symbol": "USDC",
        "version": "2",
        "decimals": 6,
        "feePayer": "0x1892f72fdB3A966b2AD8595aA5f7741Ef72d6085"
      },
      "payTo": "0xe9987a0e13b77b129b8de29654cb5ce93c4ee276",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:1",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "symbol": "USDC",
        "version": "2",
        "decimals": 6,
        "feePayer": "0x1892f72fdB3A966b2AD8595aA5f7741Ef72d6085"
      },
      "payTo": "0xe9987a0e13b77b129b8de29654cb5ce93c4ee276",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0xB97EF9Ef8734C71904D8002F8b6Bc66Dd9c48a6E",
      "extra": {
        "name": "USD Coin",
        "symbol": "USDC",
        "version": "2",
        "decimals": 6,
        "feePayer": "0x1892f72fdB3A966b2AD8595aA5f7741Ef72d6085"
      },
      "payTo": "0xe9987a0e13b77b129b8de29654cb5ce93c4ee276",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:43114",
      "maxTimeoutSeconds": 60
    },
    {
      "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
      "extra": {
        "name": "USD Coin",
        "symbol": "USDC",
        "version": "2",
        "decimals": 6,
        "feePayer": "0x1892f72fdB3A966b2AD8595aA5f7741Ef72d6085"
      },
      "payTo": "0xe9987a0e13b77b129b8de29654cb5ce93c4ee276",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:137",
      "maxTimeoutSeconds": 60
    }
  ],
  "resource": {
    "url": "https://api.relai.fi/v4/%7Bchain%7D/gasPrice",
    "mimeType": "application/json",
    "description": "Gas-free payment - RelAI sponsors transaction fees on ethereum"
  },
  "extensions": {
    "zauth": {
      "info": {
        "enabled": true,
        "version": "1.0",
        "protection": "pre-payment",
        "validation": {
          "body": true,
          "method": "head-for-get",
          "headers": true,
          "queryParams": true
        },
        "description": "Endpoint validation and payment protection by Zauth"
      },
      "schema": {
        "type": "object",
        "required": [
          "enabled",
          "version",
          "protection"
        ],
        "properties": {
          "enabled": {
            "type": "boolean"
          },
          "version": {
            "type": "string"
          },
          "protection": {
            "type": "string"
          },
          "validation": {
            "type": "object",
            "properties": {
              "body": {
                "type": "boolean"
              },
              "method": {
                "type": "string"
              },
              "headers": {
                "type": "boolean"
              },
              "queryParams": {
                "type": "boolean"
              }
            }
          },
          "description": {
            "type": "string"
          }
        }
      }
    },
    "integritas": {
      "mode": "dual_signature_split",
      "available": true,
      "feeAmount": "1000",
      "description": "Add a blockchain timestamp receipt to your payment. Include X-Integritas: true header to opt-in.",
      "selectedFlow": "dual_signature_split",
      "availableFlows": [
        "dual_signature_split",
        "single_signature_fee_included"
      ],
      "facilitatorFeeAmount": "0"
    }
  },
  "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.

10000units
on Ethereum · 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
0xe998…ee276
Token contract
0xA0b8…6eB48
Payment window
1 minute
0.01USDC≈ $0.01 USD
on Base · exact scheme

Pay 0.01 USDC on Base to 0xe998…ee276. The signed payment is good for 1 minute.

Paid to
0xe998…ee276
USD Coin contract
0x8335…02913
Payment window
1 minute
As published
10000 smallest units
10000units
on eip155:43114 · 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
0xe998…ee276
Token contract
0xB97E…48a6E
Payment window
1 minute
10000units
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
0xe998…ee276
Token contract
0x3c49…c3359
Payment window
1 minute
The catalog’s raw entry
[
  {
    "asset": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
    "extra": {
      "name": "USD Coin",
      "symbol": "USDC",
      "version": "2",
      "decimals": 6,
      "feePayer": "0x1892f72fdB3A966b2AD8595aA5f7741Ef72d6085"
    },
    "payTo": "0xe9987a0e13b77b129b8de29654cb5ce93c4ee276",
    "amount": "10000",
    "scheme": "exact",
    "network": "eip155:1",
    "resource": "https://api.relai.fi/relay/1772442473781/v4/%7Bchain%7D/gasPrice",
    "maxTimeoutSeconds": 60
  },
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "symbol": "USDC",
      "version": "2",
      "decimals": 6,
      "feePayer": "0x1892f72fdB3A966b2AD8595aA5f7741Ef72d6085"
    },
    "payTo": "0xe9987a0e13b77b129b8de29654cb5ce93c4ee276",
    "amount": "10000",
    "scheme": "exact",
    "network": "eip155:8453",
    "resource": "https://api.relai.fi/relay/1772442473781/v4/%7Bchain%7D/gasPrice",
    "maxTimeoutSeconds": 60
  },
  {
    "asset": "0xB97EF9Ef8734C71904D8002F8b6Bc66Dd9c48a6E",
    "extra": {
      "name": "USD Coin",
      "symbol": "USDC",
      "version": "2",
      "decimals": 6,
      "feePayer": "0x1892f72fdB3A966b2AD8595aA5f7741Ef72d6085"
    },
    "payTo": "0xe9987a0e13b77b129b8de29654cb5ce93c4ee276",
    "amount": "10000",
    "scheme": "exact",
    "network": "eip155:43114",
    "resource": "https://api.relai.fi/relay/1772442473781/v4/%7Bchain%7D/gasPrice",
    "maxTimeoutSeconds": 60
  },
  {
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "extra": {
      "name": "USD Coin",
      "symbol": "USDC",
      "version": "2",
      "decimals": 6,
      "feePayer": "0x1892f72fdB3A966b2AD8595aA5f7741Ef72d6085"
    },
    "payTo": "0xe9987a0e13b77b129b8de29654cb5ce93c4ee276",
    "amount": "10000",
    "scheme": "exact",
    "network": "eip155:137",
    "resource": "https://api.relai.fi/relay/1772442473781/v4/%7Bchain%7D/gasPrice",
    "maxTimeoutSeconds": 60
  }
]

Provenance

Seen in the source catalog
2026-09-19 19:17Z
Last indexed by Roundhouse
2026-09-20 18:45Z
Last enriched (probe, favicon, geo)
2026-09-10 01:45Z
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

Nothing indexed for this service or its provider yet. Not a claim that it is unused — only that we hold no record. 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 api.relai.fi 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=api.relai.fi'
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.relai.fi/relay/1772442473781/v4/%7Bchain%7D/gasPrice, 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.