Roundhouse

offercheck

Current prices for cryptocurrencies and tokens by symbol (btc, eth, sol, usdc, ...), CoinGecko slug, or on-chain token address on Base, Ethereum, Arbitrum, Solana and 100+ chains, using DeFiLlama's aggregated DEX/CEX pricing with a per-asset confidence score. Quote in USD or any ECB fiat currency. Up to 25 assets per call. $0.002 per call.

TradingLiveeip155:8453Exactvia cdp
https://offercheck.offercheck.workers.dev/v1/price
FinanceFxExchange-rateCurrencyCrypto
Calls · 30d
3→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 32 snapshots so far.
$0.16
Verified settled volume
47 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0020
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.
3
Unique payers · 30d
Last called 2026-10-11 08:40Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xB9721FDD2EC85F7f604F5BBcA2292d7C4ff6B62c

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.

0.002USDC≈ $0.002 USD
on Base · exact scheme

Pay 0.002 USDC on Base to 0xB972…6B62c. The signed payment is good for 2 minutes.

Paid to
0xB972…6B62c
USD Coin contract
0x8335…02913
Payment window
2 minutes
As published
2000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xB9721FDD2EC85F7f604F5BBcA2292d7C4ff6B62c",
    "amount": "2000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 120
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "vs": "USD",
          "ids": "btc,eth,base:0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "ms": 180,
          "vs": "USD",
          "prices": {
            "btc": {
              "id": "coingecko:bitcoin",
              "price": 83819.24,
              "symbol": "BTC",
              "price_usd": 83819.24,
              "priced_at": "2026-09-25T20:53:20.000Z",
              "confidence": 0.99
            },
            "base:0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913": {
              "id": "base:0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
              "price": 0.9999,
              "symbol": "USDC",
              "decimals": 6,
              "price_usd": 0.9999,
              "priced_at": "2026-09-25T20:53:20.000Z",
              "confidence": 0.99
            }
          },
          "source": "DeFiLlama coins API (aggregated on-chain DEX + CEX pricing with a per-asset confidence score)",
          "warnings": [],
          "fetched_at": "2026-09-25T20:53:41.000Z"
        }
      }
    },
    "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",
              "required": [],
              "properties": {
                "vs": {
                  "type": "string",
                  "default": "USD",
                  "description": "Quote currency: USD (default) or any ECB fiat code (EUR, GBP, JPY, ...)"
                },
                "ids": {
                  "type": "string",
                  "default": "btc,eth",
                  "description": "Comma-separated assets: symbols (btc, eth, sol, usdc, usdt, bnb, xrp, ada, doge, avax, link, ...), coingecko:<slug>, or <chain>:<token address> (e.g. base:0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). Default btc,eth. Max 25."
                }
              }
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object"
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-10-11 08:40Z
Last indexed by Roundhouse
2026-10-25 06:50Z
Last enriched (probe, favicon, geo)
2026-09-27 04:15Z
x402 version
2
Max timeout
120s
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 offercheck 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=offercheck'
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://offercheck.offercheck.workers.dev/v1/price, 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.