offercheck
Convert between 30 major currencies (USD, EUR, GBP, JPY, CHF, CNY, INR, ILS, AUD, CAD, ...) using the European Central Bank's daily reference rates: rate and converted amount for one or many target currencies, optional historical date back to 1999. Returns the ECB rate date and source. $0.002 per call.
The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
Pay 0.002 USDC on Base to 0xB972…6B62c. The signed payment is good for 2 minutes.
- Paid to
- 0xB972…6B62c
- USD Coin contract
- 0x8335…02913
- Payment window
- 2 minutes
- As published
- 2000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xB9721FDD2EC85F7f604F5BBcA2292d7C4ff6B62c",
"amount": "2000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 120
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"to": "EUR,GBP",
"from": "USD",
"amount": "100"
}
},
"output": {
"type": "json",
"example": {
"ms": 95,
"date": "2026-09-25",
"from": "USD",
"rates": {
"EUR": {
"rate": 0.87696,
"converted": 87.696
},
"GBP": {
"rate": 0.75458,
"converted": 75.458
}
},
"amount": 100,
"source": "European Central Bank euro foreign exchange reference rates (published once per business day ~16:00 CET) via frankfurter.dev; non-EUR pairs are cross rates through EUR",
"warnings": [],
"fetched_at": "2026-09-25T20:00:00.000Z"
}
}
},
"schema": {
"type": "object",
"$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": {
"to": {
"type": "string",
"default": "EUR",
"description": "Target currency or comma-separated list (default EUR); any of the 30 ECB currencies"
},
"date": {
"type": "string",
"description": "Optional historical date YYYY-MM-DD (ECB business days from 1999-01-04); omit for the latest rates"
},
"from": {
"type": "string",
"default": "USD",
"description": "Base currency, ISO 4217 code (default USD)"
},
"amount": {
"type": "string",
"default": "1",
"pattern": "^[0-9]+(\\.[0-9]+)?$",
"description": "Amount in the base currency to convert, as a decimal number string, e.g. \"100\" (default 1). Query parameters are strings, so the Coinbase Bazaar validator rejects a numeric type here."
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-26 15:58Z
- Last indexed by Roundhouse
- 2026-10-26 22:30Z
- Last enriched (probe, favicon, geo)
- 2026-09-27 04:15Z
- x402 version
- 2
- Max timeout
- 120s
- Liveness probe
- HTTP 402
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.
Show the promptHide 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/fx, 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.