Roundhouse AI

Attestations

Signed USDC/EURe spot rate read directly from the EURe/USDC 0.30% Uniswap v3 pool on Polygon (mid-price from sqrtPriceX96). The on-chain rate behind the euro off-ramp; the envelope carries the exact eth_call slot0() so the number is independently re-checkable. Excludes the pool fee and slippage.

SearchLiveeip155:8453Exactvia cdp
https://gateway.apiosk.com/attestations/usdc-eure
SecurityAttestations
Activity
—
Nothing indexed for this service or its provider yet. Not a claim that it is unused — only that we hold no record.
$146.60
Verified settled volume
1,957 settlements proven x402 by their on-chain EIP-3009 marker.
$0.030
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 2026-07-22 08:01Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xA039E3dEb5ca71E41905f90491FC5d016CE23B79

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.

0.03USDC≈ $0.03 USD
on Base · exact scheme

Pay 0.03 USDC on Base to 0xA039…23B79. The signed payment is good for 5 minutes.

Paid to
0xA039…23B79
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
30000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xA039E3dEb5ca71E41905f90491FC5d016CE23B79",
    "amount": "30000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {},
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "id": "obs_...",
          "ok": true,
          "jws": "eyJ...",
          "result": {
            "fee": 3000,
            "base": "USDC",
            "pair": "USDC/EURe",
            "pool": "0x7d4324293304797cb662c6ea1b904b6af2b485f5",
            "block": 89871950,
            "chain": "polygon",
            "quote": "EURe",
            "chain_id": 137,
            "fee_percent": "0.3000",
            "eure_per_usdc": "0.87718046",
            "usdc_per_eure": "1.14001627",
            "sqrt_price_x96": "84593132790838948516727"
          },
          "source": {
            "via": "polygon-rpc",
            "call": {
              "to": "0x7d4324293304797cb662c6ea1b904b6af2b485f5",
              "data": "0x3850c7bd",
              "block": "0x55b8b0e"
            },
            "method": "eth_call slot0()",
            "provider": "uniswap-v3"
          },
          "service": "usdc-eure"
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object"
        },
        "output": {
          "type": "object"
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-07-22 08:01Z
Last indexed by Roundhouse
2026-08-08 05:20Z
Last enriched (probe, favicon, geo)
2026-09-25 06:15Z
x402 version
2
Max timeout
300s
Liveness probe
HTTP 405
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 Attestations 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=Attestations'
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://gateway.apiosk.com/attestations/usdc-eure, 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.