Roundhouse

Currency Converter (ECB)

Currency converter (ECB reference rates): convert an amount from one currency to one or more others, e.g. 250 USD to EUR, GBP and JPY, at the latest European Central Bank rate or any day in the last 90 days. Returns the rate, converted amount and rate date for each target. 30 currencies. Reference rates, not transaction rates. Source: ECB. Signed receipt.

InfraLiveeip155:8453Exactvia cdp
https://api.stablecoingateways.com/v1/fx/convert
Currency-converterFxConvert-currencyExchange-ratesEcb
Calls · 30d
4
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 4 snapshots so far.
$0.09
Verified settled volume
33 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0010
Listed price
As published in the catalog. Always read the live 402 before paying.
5
Calls · 30d
Upstream's own call count for this endpoint, not ours.
4
Unique payers · 30d
Last called 2026-10-26 14:58Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x39BF4378b74f9E19c5113b00b01f57d94537bad1

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.

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "error": "PAYMENT-SIGNATURE header is required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2",
        "invoiceId": "1792704388-3e0cbfc005ba4c2d-d789-43b033f5bb5ad879666a806b"
      },
      "payTo": "0x39BF4378b74f9E19c5113b00b01f57d94537bad1",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 600
    },
    {
      "asset": "XRP",
      "extra": {
        "invoiceId": "1792704388-3e0cbfc005ba4c2d-d789-43b033f5bb5ad879666a806b",
        "sourceTag": 26100012
      },
      "payTo": "r3BsahzSMtF4HiJuL8HMf1se6T1JtMB6hg",
      "amount": "789",
      "scheme": "exact",
      "network": "xrpl:0",
      "maxTimeoutSeconds": 600
    },
    {
      "asset": "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
      "extra": {
        "name": "USDC",
        "version": "2",
        "invoiceId": "1792704388-3e0cbfc005ba4c2d-d789-43b033f5bb5ad879666a806b"
      },
      "payTo": "0x3177FA489523ddF60f293898f7Ee5912576f3d9b",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:84532",
      "maxTimeoutSeconds": 600
    },
    {
      "asset": "XRP",
      "extra": {
        "invoiceId": "1792704388-3e0cbfc005ba4c2d-d789-43b033f5bb5ad879666a806b",
        "sourceTag": 26100012
      },
      "payTo": "rDbkEYdqLHcnWAHAVFwhH6KM6puCPbXNgs",
      "amount": "789",
      "scheme": "exact",
      "network": "xrpl:1",
      "maxTimeoutSeconds": 600
    }
  ],
  "resource": {
    "url": "https://api.stablecoingateways.com/v1/fx/convert",
    "tags": [
      "currency-converter",
      "fx",
      "convert-currency",
      "exchange-rates",
      "ecb"
    ],
    "mimeType": "application/json",
    "description": "Currency converter (ECB reference rates): convert an amount from one currency to one or more others, e.g. 250 USD to EUR, GBP and JPY, at the latest European Central Bank rate or any day in the last 90 days. Returns the rate, converted amount and rate date for each target. 30 currencies. Reference rates, not transaction rates. Source: ECB. Signed receipt.",
    "serviceName": "Currency Converter (ECB)"
  },
  "extensions": {
    "docs": "https://api.stablecoingateways.com/openapi.json",
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "to": "EUR,GBP,JPY",
            "from": "USD",
            "amount": "250"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "data": {
              "from": "USD",
              "note": "ECB reference rates are for information only and are not transaction rates.",
              "amount": 250,
              "source": "European Central Bank euro foreign exchange reference rates. Source: ECB. This informat...",
              "window": [
                "2026-07-24"
              ],
              "rate_date": "2026-10-21",
              "conversions": {
                "EUR": {
                  "rate": 0.89015489,
                  "amount": 222.538723
                },
                "GBP": {
                  "rate": 0.74617233,
                  "amount": 186.543083
                },
                "JPY": {
                  "rate": 157.87787075,
                  "amount": 39469.467688
                }
              },
              "requested_date": null,
              "cross_rates_derived": true
            },
            "receipt": {
              "v": 1,
              "ts": "2026-10-22T09:00:00Z",
              "sig": "hex",
              "price": {
                "asset": "USDC",
                "amount": "1000",
                "network": "eip155:84532"
              },
              "log_seq": 1,
              "tx_hash": "0x..",
              "endpoint_id": "fx-convert-v1",
              "request_hash": "hex",
              "response_hash": "hex"
            }
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "headers": {
                "type": "object",
                "additionalProperties": {
                  "type": "string"
                }
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "from",
                  "to",
                  "amount"
                ],
                "properties": {
                  "to": {
                    "type": "string",
                    "pattern": "^[A-Za-z]{3}(,[A-Za-z]{3}){0,9}$",
                    "description": "Comma-separated target currencies (ISO 4217), 1-10"
                  },
                  "date": {
                    "type": "string",
                    "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
                    "description": "Rate date YYYY-MM-DD within the last 90 days; default latest"
                  },
                  "from": {
                    "type": "string",
                    "pattern": "^[A-Za-z]{3}$",
                    "description": "Source currency (ISO 4217)"
                  },
                  "amount": {
                    "type": "string",
                    "pattern": "^[0-9]{1,15}(\\.[0-9]{1,8})?$",
                    "description": "Amount to convert"
                  }
                },
                "additionalProperties": false
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object",
                "required": [
                  "data",
                  "receipt"
                ],
                "properties": {
                  "data": {
                    "type": "object",
                    "$schema": "https://json-schema.org/draft/2020-12/schema",
                    "properties": {
                      "from": {
                        "type": "string"
                      },
                      "note": {
                        "type": "string"
                      },
                      "amount": {
                        "type": "integer"
                      },
                      "source": {
                        "type": "string"
                      },
                      "window": {
                        "type": "array",
                        "items": {
                          "type": "string"
                        }
                      },
                      "rate_date": {
                        "type": "string"
                      },
                      "conversions": {
                        "type": "object",
                        "properties": {
                          "EUR": {
                            "type": "object"
                          },
                          "GBP": {
                            "type": "object"
                          },
                          "JPY": {
                            "type": "object"
                          }
                        }
                      },
                      "requested_date": {},
                      "cross_rates_derived": {
                        "type": "boolean"
                      }
                    }
                  },
                  "receipt": {
                    "type": "object",
                    "required": [
                      "v",
                      "endpoint_id",
                      "ts",
                      "price",
                      "tx_hash",
                      "request_hash",
                      "response_hash",
                      "log_seq",
                      "sig"
                    ],
                    "description": "Ed25519-signed receipt; verify free at POST /v1/verify-receipt"
                  }
                }
              }
            }
          }
        }
      }
    },
    "params": {
      "to": "comma list of up to 10 codes, e.g. EUR,GBP",
      "date": "YYYY-MM-DD (optional)",
      "from": "ISO 4217 code, e.g. USD",
      "amount": "positive number"
    },
    "source": "European Central Bank euro foreign exchange reference rates. Source: ECB. This information may be obtained free of charge at https://www.ecb.europa.eu/stats/policy_and_exchange_rates/euro_reference_exchange_rates/html/index.en.html",
    "status": "https://api.stablecoingateways.com/status",
    "receipts": "https://api.stablecoingateways.com/v1/verify-receipt",
    "price_usd": "0.001",
    "xrp_quote": {
      "usd": "0.001",
      "note": "XRP amount = ceil(USD / quote x 1e6 x (1+margin)); bound into the invoice MAC",
      "age_s": 0,
      "state": "fresh",
      "source": "coinbase:XRP-USD spot",
      "available": true,
      "max_age_s": 900,
      "quoted_at": "2026-10-22T21:16:28.789Z",
      "xrp_drops": "789",
      "margin_pct": 3,
      "usd_per_xrp": 1.3065
    }
  },
  "x402Version": 2
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.001USDC≈ $0.001 USD
on Base · exact scheme

Pay 0.001 USDC on Base to 0x39BF…7bad1. The signed payment is good for 10 minutes.

Paid to
0x39BF…7bad1
USD Coin contract
0x8335…02913
Payment window
10 minutes
As published
1000 smallest units
793units
on xrpl:0 · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to
r3Bsah…MB6hg
Token contract
XRP
Payment window
10 minutes
0.001USDC≈ $0.001 USD
on Base Sepolia · exact scheme

Pay 0.001 USDC on Base Sepolia to 0x3177…f3d9b. The signed payment is good for 10 minutes.

Paid to
0x3177…f3d9b
USD Coin (Base Sepolia) contract
0x036C…dCF7e
Payment window
10 minutes
As published
1000 smallest units
793units
on xrpl:1 · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to
rDbkEY…bXNgs
Token contract
XRP
Payment window
10 minutes
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2",
      "invoiceId": "1793027315-a665c3e654894c55-d793-45e5d62fe1f7aeb434898ee7"
    },
    "payTo": "0x39BF4378b74f9E19c5113b00b01f57d94537bad1",
    "amount": "1000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 600
  },
  {
    "asset": "XRP",
    "extra": {
      "invoiceId": "1793027315-a665c3e654894c55-d793-45e5d62fe1f7aeb434898ee7",
      "sourceTag": 26100012
    },
    "payTo": "r3BsahzSMtF4HiJuL8HMf1se6T1JtMB6hg",
    "amount": "793",
    "scheme": "exact",
    "network": "xrpl:0",
    "maxTimeoutSeconds": 600
  },
  {
    "asset": "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
    "extra": {
      "name": "USDC",
      "version": "2",
      "invoiceId": "1793027315-a665c3e654894c55-d793-45e5d62fe1f7aeb434898ee7"
    },
    "payTo": "0x3177FA489523ddF60f293898f7Ee5912576f3d9b",
    "amount": "1000",
    "scheme": "exact",
    "network": "eip155:84532",
    "maxTimeoutSeconds": 600
  },
  {
    "asset": "XRP",
    "extra": {
      "invoiceId": "1793027315-a665c3e654894c55-d793-45e5d62fe1f7aeb434898ee7",
      "sourceTag": 26100012
    },
    "payTo": "rDbkEYdqLHcnWAHAVFwhH6KM6puCPbXNgs",
    "amount": "793",
    "scheme": "exact",
    "network": "xrpl:1",
    "maxTimeoutSeconds": 600
  }
]

Extensions

{
  "docs": "https://api.stablecoingateways.com/openapi.json",
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "to": "EUR,GBP,JPY",
          "from": "USD",
          "amount": "250"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "data": {
            "from": "USD",
            "note": "ECB reference rates are for information only and are not transaction rates.",
            "amount": 250,
            "source": "European Central Bank euro foreign exchange reference rates. Source: ECB. This informat...",
            "window": [
              "2026-07-27"
            ],
            "rate_date": "2026-10-23",
            "provenance": {
              "facts": [
                {
                  "id": "fx.ecb_reference_rates",
                  "fact": "Our copy of the ECB euro foreign exchange reference rates holds a r...",
                  "limits": [
                    "ECB reference rates are published once per work..."
                  ],
                  "source": "European Central Bank euro foreign exchange reference rates (eurofx...",
                  "source_url": "https://www.ecb.europa.eu/stats/eurofxref/eurofxref-hist-90d.xml",
                  "retrieved_at": "2026-10-24T08:00:15.145Z",
                  "source_as_of": "2026-10-23"
                }
              ],
              "schema": "sg-provenance/1",
              "evidence_only": true,
              "data_timestamp": "2026-10-24T08:00:15.145Z"
            },
            "conversions": {
              "EUR": {
                "rate": 0.89341553,
                "amount": 223.353883
              },
              "GBP": {
                "rate": 0.74803895,
                "amount": 187.009738
              },
              "JPY": {
                "rate": 156.80335924,
                "amount": 39200.83981
              }
            },
            "requested_date": null,
            "cross_rates_derived": true
          },
          "receipt": {
            "v": 1,
            "ts": "2026-10-22T09:00:00Z",
            "sig": "hex",
            "price": {
              "asset": "USDC",
              "amount": "1000",
              "network": "eip155:84532"
            },
            "log_seq": 1,
            "tx_hash": "0x..",
            "evidence": {
              "terms_hash": "<sha256>",
              "validation": "input=pass;freshness=pass;output=pass;provenance=pass",
              "terms_version": "<label>",
              "data_timestamp": "2026-10-24T09:00:00Z",
              "provenance_hash": "<sha256>",
              "service_version": "<version>"
            },
            "endpoint_id": "fx-convert-v1",
            "request_hash": "hex",
            "response_hash": "hex"
          }
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method"
          ],
          "properties": {
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "headers": {
              "type": "object",
              "additionalProperties": {
                "type": "string"
              }
            },
            "queryParams": {
              "type": "object",
              "required": [
                "from",
                "to",
                "amount"
              ],
              "properties": {
                "to": {
                  "type": "string",
                  "pattern": "^[A-Za-z]{3}(,[A-Za-z]{3}){0,9}$",
                  "description": "Comma-separated target currencies (ISO 4217), 1-10"
                },
                "date": {
                  "type": "string",
                  "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
                  "description": "Rate date YYYY-MM-DD within the last 90 days; default latest"
                },
                "from": {
                  "type": "string",
                  "pattern": "^[A-Za-z]{3}$",
                  "description": "Source currency (ISO 4217)"
                },
                "amount": {
                  "type": "string",
                  "pattern": "^[0-9]{1,15}(\\.[0-9]{1,8})?$",
                  "description": "Amount to convert"
                }
              },
              "additionalProperties": false
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object",
              "required": [
                "data",
                "receipt"
              ],
              "properties": {
                "data": {
                  "type": "object",
                  "$schema": "https://json-schema.org/draft/2020-12/schema",
                  "properties": {
                    "from": {
                      "type": "string"
                    },
                    "note": {
                      "type": "string"
                    },
                    "amount": {
                      "type": "integer"
                    },
                    "source": {
                      "type": "string"
                    },
                    "window": {
                      "type": "array",
                      "items": {
                        "type": "string"
                      }
                    },
                    "rate_date": {
                      "type": "string"
                    },
                    "provenance": {
                      "type": "object",
                      "description": "Additive evidence block (sg-provenance/1): per-fact source, retrieval time, limits; no score or verdict. Full schema in OpenAPI."
                    },
                    "conversions": {
                      "type": "object",
                      "properties": {
                        "EUR": {
                          "type": "object"
                        },
                        "GBP": {
                          "type": "object"
                        },
                        "JPY": {
                          "type": "object"
                        }
                      }
                    },
                    "requested_date": {},
                    "cross_rates_derived": {
                      "type": "boolean"
                    }
                  },
                  "description": "Converted amounts and rates per target currency at the ECB rate date"
                },
                "receipt": {
                  "type": "object",
                  "required": [
                    "v",
                    "endpoint_id",
                    "ts",
                    "price",
                    "tx_hash",
                    "request_hash",
                    "response_hash",
                    "log_seq",
                    "sig"
                  ],
                  "properties": {
                    "evidence": {
                      "type": "object",
                      "description": "Signed evidence (see llms.txt)"
                    }
                  },
                  "description": "Ed25519-signed receipt; verify free at POST /v1/verify-receipt. New receipts also carry a signed `evidence` object."
                }
              }
            }
          }
        }
      }
    }
  },
  "params": {
    "to": "comma list of up to 10 codes, e.g. EUR,GBP",
    "date": "YYYY-MM-DD (optional)",
    "from": "ISO 4217 code, e.g. USD",
    "amount": "positive number"
  },
  "source": "European Central Bank euro foreign exchange reference rates. Source: ECB. This information may be obtained free of charge at https://www.ecb.europa.eu/stats/policy_and_exchange_rates/euro_reference_exchange_rates/html/index.en.html",
  "status": "https://api.stablecoingateways.com/status",
  "receipts": "https://api.stablecoingateways.com/v1/verify-receipt",
  "price_usd": "0.001",
  "xrp_quote": {
    "usd": "0.001",
    "note": "XRP amount = ceil(USD / quote x 1e6 x (1+margin)); bound into the invoice MAC",
    "age_s": 2,
    "state": "fresh",
    "source": "xrpl:amm XRP/RLUSD (RLUSD=1 USD) ledger 107917474",
    "available": true,
    "max_age_s": 900,
    "quoted_at": "2026-10-26T14:58:33.657Z",
    "xrp_drops": "793",
    "margin_pct": 3,
    "usd_per_xrp": 1.298914
  }
}

Provenance

Seen in the source catalog
2026-10-26 14:58Z
Last indexed by Roundhouse
2026-10-26 20:00Z
Last enriched (probe, favicon, geo)
2026-10-22 21:16Z
x402 version
2
Max timeout
600s
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. 4 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 Currency Converter (ECB) 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=Currency%20Converter%20(ECB)'
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://api.stablecoingateways.com/v1/fx/convert, 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.