Exchange rates
Reference exchange rates for a base currency against some or all supported currencies (latest or a historical date).
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.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"hint": "Use a supported wallet to pay for this resource using one of the supported payment methods returned in the WWW-Authenticate header. See https://mpp.dev/tools/wallet.md",
"type": "https://paymentauth.org/problems/payment-required",
"title": "Payment Required",
"detail": "Payment is required (Reference exchange rates for a base currency against some or all supported currencies (latest or a historical date).).",
"status": 402,
"challengeId": "B3kr8gOQyFJY2An2HvKVmwpMHCCm8NcxiV4QZZ3scQU"
}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 0.006 USDC on Base to 0xb3f4…2194A. The signed payment is good for 5 minutes.
- Paid to
- 0xb3f4…2194A
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 6000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xb3f4de103F34b99f0Da19B4F16D6B53a14C2194A",
"amount": "6000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"base": "AUD",
"date": "2024-01-01",
"symbols": [
"AUD"
]
},
"type": "http",
"method": "POST",
"bodyType": "json"
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"base"
],
"properties": {
"base": {
"enum": [
"AUD",
"BRL",
"CAD",
"CHF",
"CNY",
"CZK",
"DKK",
"EUR",
"GBP",
"HKD",
"HUF",
"IDR",
"ILS",
"INR",
"ISK",
"JPY",
"KRW",
"MXN",
"MYR",
"NOK",
"NZD",
"PHP",
"PLN",
"RON",
"SEK",
"SGD",
"THB",
"TRY",
"USD",
"ZAR"
],
"type": "string",
"description": "Base currency (ISO 4217)."
},
"date": {
"type": "string",
"pattern": "^\\d{4}-\\d{2}-\\d{2}$",
"description": "Historical date (YYYY-MM-DD). Defaults to latest."
},
"symbols": {
"type": "array",
"items": {
"enum": [
"AUD",
"BRL",
"CAD",
"CHF",
"CNY",
"CZK",
"DKK",
"EUR",
"GBP",
"HKD",
"HUF",
"IDR",
"ILS",
"INR",
"ISK",
"JPY",
"KRW",
"MXN",
"MYR",
"NOK",
"NZD",
"PHP",
"PLN",
"RON",
"SEK",
"SGD",
"THB",
"TRY",
"USD",
"ZAR"
],
"type": "string"
},
"minItems": 1,
"description": "Target currencies. Omit for all supported currencies."
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-09-06 08:06Z
- Last indexed by Roundhouse
- 2026-09-25 01:50Z
- Last enriched (probe, favicon, geo)
- 2026-09-14 00:15Z
- x402 version
- 2
- Max timeout
- 300s
- 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. 19 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 Exchange rates 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=Exchange%20rates' 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://fx.openverbs.com/v1/rates, 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.