Roundhouse AI

ECB FX Rates

Interactive Bitcoin 4-year halving cycle chart on a polar disc. Live price, 200W MA, Mayer Multiple, RSI, MACD, Pi Cycle and optional paid cycle projections.

OtherLiveeip155:8453Exactvia cdp
https://4yearcycle.com/x402/fx-rates
FxForexExchange-ratesCurrenciesEcb
Calls · 30d
2
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 13 snapshots so far.
$0.51
Verified settled volume
31 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0050
Listed price
As published in the catalog. Always read the live 402 before paying.
2
Calls · 30d
Upstream's own call count for this endpoint, not ours.
2
Unique payers · 30d
Last called 2026-09-17 03:46Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x9862ca83b72aB95521F457aFf6e6EFb03d8164C3

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.

0.005USDC≈ $0.005 USD
on Base · exact scheme

Pay 0.005 USDC on Base to 0x9862…164C3. The signed payment is good for 5 minutes.

Paid to
0x9862…164C3
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
5000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x9862ca83b72aB95521F457aFf6e6EFb03d8164C3",
    "amount": "5000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "base": "USD",
          "symbols": "EUR,GBP,JPY,CHF"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "base": "USD",
          "date": "2026-08-17",
          "rates": {
            "CHF": 0.809885,
            "EUR": 0.862589,
            "GBP": 0.737514,
            "JPY": 159.225395
          },
          "notice": "ECB euro foreign exchange reference rates, available free of charge at ecb.europa.eu; non-EUR bases are cross-rates computed via EUR.",
          "source": "ECB"
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method"
          ],
          "properties": {
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "type": "object",
              "required": [],
              "properties": {
                "base": {
                  "type": "string",
                  "default": "EUR",
                  "pattern": "^[A-Za-z]{3}$",
                  "examples": [
                    "EUR",
                    "USD",
                    "GBP"
                  ],
                  "description": "Base currency as ISO 4217 code (case-insensitive). EUR or any of the ~30 ECB-listed currencies (USD, GBP, JPY, CHF, ...); non-EUR bases are computed as cross-rates via EUR. Default: EUR."
                },
                "symbols": {
                  "type": "string",
                  "examples": [
                    "USD,GBP,JPY",
                    "CHF"
                  ],
                  "description": "Optional comma-separated ISO 4217 codes to restrict the rate table to (case-insensitive); codes the ECB does not list are ignored. Empty = all listed currencies."
                }
              },
              "additionalProperties": false
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object",
              "required": [
                "base",
                "date",
                "rates",
                "source",
                "notice"
              ],
              "properties": {
                "base": {
                  "type": "string",
                  "description": "Base currency of the rate table (ISO 4217)"
                },
                "date": {
                  "type": "string",
                  "description": "ECB reference date of the rates (YYYY-MM-DD, last business day)"
                },
                "rates": {
                  "type": "object",
                  "description": "Units of each quoted currency per 1 unit of base, e.g. rates.USD = USD per base. ECB publishes vs EUR; other bases are cross-rates via EUR rounded to 6 decimals.",
                  "additionalProperties": {
                    "type": "number"
                  }
                },
                "notice": {
                  "type": "string",
                  "description": "ECB attribution notice: the underlying data is available free of charge from the ECB; cross-rates are computed values"
                },
                "source": {
                  "type": "string",
                  "description": "Always \"ECB\" — European Central Bank euro foreign exchange reference rates"
                }
              }
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-09-25 12:36Z
Last indexed by Roundhouse
2026-09-25 17:30Z
Last enriched (probe, favicon, geo)
2026-09-12 17:45Z
x402 version
2
Max timeout
300s
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. 13 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 ECB FX 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=ECB%20FX%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://4yearcycle.com/x402/fx-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.