Roundhouse

QuickBuild

Foreign-exchange rates from one base currency (`from`, default USD) to a list of currencies (`to`, comma-separated, or "all"; default 14 majors incl. EUR, GBP, JPY, CNY, INR, KRW, VND), with `amount` converted. Live mode uses Coinbase public exchange rates (updated about every minute, 160+ ISO 4217 currencies plus XAU/XAG), falling back to exchangerate-api daily rates. With `date=YYYY-MM-DD` it returns the ECB reference rates for that day (Frankfurter, ~30 major currencies, back to...

DataLiveeip155:8453Exactvia cdp
https://quickbuild.quynguyenbac.workers.dev/api/fx/rate
FxForexCurrencyExchange-rateFinance
Calls · 30d
2
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 15 snapshots so far.
$0.18
Verified settled volume
26 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.
2
Calls · 30d
Upstream's own call count for this endpoint, not ours.
2
Unique payers · 30d
Last called 2026-10-24 16:37Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x751a4c3841bE287544C371B4EE09Bd3366AeA7cf

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 required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x751a4c3841bE287544C371B4EE09Bd3366AeA7cf",
      "amount": "2000",
      "scheme": "exact",
      "network": "eip155:8453",
      "mimeType": "application/json",
      "resource": "https://quickbuild.quynguyenbac.workers.dev/api/fx/rate",
      "description": "Foreign-exchange rates from one base currency (`from`, default USD) to a list of currencies (`to`, comma-separated, or \"all\"; default 14 majors incl. EUR, GBP, JPY, CNY, INR, KRW, VND), with `amount` converted. Live mode uses Coinbase public exchange rates (updated about every minute, 160+ ISO 4217 currencies plus XAU/XAG), falling back to exchangerate-api daily rates. With `date=YYYY-MM-DD` it returns the ECB reference rates for that day (Frankfurter, ~30 major currencies, back to...",
      "outputSchema": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "to": "EUR,JPY,VND",
            "from": "USD",
            "amount": 100
          },
          "discoverable": true
        },
        "output": {
          "type": "json",
          "example": {
            "asOf": "2026-10-21T01:20:03.000Z",
            "date": "latest",
            "from": "USD",
            "count": 3,
            "rates": {
              "EUR": 0.8906,
              "JPY": 158.278,
              "VND": 25876.28
            },
            "amount": 100,
            "source": "coinbase",
            "missing": [],
            "converted": {
              "EUR": 89.06,
              "JPY": 15827.8,
              "VND": 2587628.46
            },
            "fetchedAt": "2026-10-21T01:20:03.000Z"
          }
        }
      },
      "maxAmountRequired": "2000",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://quickbuild.quynguyenbac.workers.dev/api/fx/rate",
    "tags": [
      "fx",
      "forex",
      "currency",
      "exchange-rate",
      "finance"
    ],
    "mimeType": "application/json",
    "description": "Foreign-exchange rates from one base currency (`from`, default USD) to a list of currencies (`to`, comma-separated, or \"all\"; default 14 majors incl. EUR, GBP, JPY, CNY, INR, KRW, VND), with `amount` converted. Live mode uses Coinbase public exchange rates (updated about every minute, 160+ ISO 4217 currencies plus XAU/XAG), falling back to exchangerate-api daily rates. With `date=YYYY-MM-DD` it returns the ECB reference rates for that day (Frankfurter, ~30 major currencies, back to...",
    "serviceName": "QuickBuild"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "to": "EUR,JPY,VND",
            "from": "USD",
            "amount": 100
          }
        },
        "output": {
          "type": "json",
          "example": {
            "asOf": "2026-10-21T01:20:03.000Z",
            "date": "latest",
            "from": "USD",
            "count": 3,
            "rates": {
              "EUR": 0.8906,
              "JPY": 158.278,
              "VND": 25876.28
            },
            "amount": 100,
            "source": "coinbase",
            "missing": [],
            "converted": {
              "EUR": 89.06,
              "JPY": 15827.8,
              "VND": 2587628.46
            },
            "fetchedAt": "2026-10-21T01:20:03.000Z"
          }
        }
      },
      "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",
                    "description": "Comma-separated target codes (max 50) or \"all\". Default: EUR,GBP,JPY,CNY,CHF,CAD,AUD,INR,KRW,SGD,HKD,MXN,BRL,VND."
                  },
                  "date": {
                    "type": "string",
                    "description": "Optional YYYY-MM-DD for historical ECB reference rates (since 1999-01-04). Omit for live rates."
                  },
                  "from": {
                    "type": "string",
                    "description": "Base currency, ISO 4217 code (default USD)."
                  },
                  "amount": {
                    "type": "number",
                    "minimum": 0,
                    "description": "Amount in `from` to convert (default 1)."
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object",
                "properties": {
                  "asOf": {
                    "type": "string"
                  },
                  "date": {
                    "type": "string"
                  },
                  "from": {
                    "type": "string"
                  },
                  "count": {
                    "type": "integer"
                  },
                  "rates": {
                    "type": "object",
                    "description": "code -> units of that currency per 1 `from`"
                  },
                  "amount": {
                    "type": "number"
                  },
                  "source": {
                    "type": "string"
                  },
                  "missing": {
                    "type": "array",
                    "items": {
                      "type": "string"
                    }
                  },
                  "converted": {
                    "type": "object",
                    "description": "code -> amount converted"
                  },
                  "fetchedAt": {
                    "type": "string"
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "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.

0.002USDC≈ $0.002 USD
on Base · exact scheme

Pay 0.002 USDC on Base to 0x751a…eA7cf. The signed payment is good for 5 minutes.

Paid to
0x751a…eA7cf
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
2000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x751a4c3841bE287544C371B4EE09Bd3366AeA7cf",
    "amount": "2000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "to": "EUR,JPY,VND",
          "from": "USD",
          "amount": 100
        }
      },
      "output": {
        "type": "json",
        "example": {
          "asOf": "2026-10-21T01:20:03.000Z",
          "date": "latest",
          "from": "USD",
          "count": 3,
          "rates": {
            "EUR": 0.8906,
            "JPY": 158.278,
            "VND": 25876.28
          },
          "amount": 100,
          "source": "coinbase",
          "missing": [],
          "converted": {
            "EUR": 89.06,
            "JPY": 15827.8,
            "VND": 2587628.46
          },
          "fetchedAt": "2026-10-21T01:20:03.000Z"
        }
      }
    },
    "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",
                  "description": "Comma-separated target codes (max 50) or \"all\". Default: EUR,GBP,JPY,CNY,CHF,CAD,AUD,INR,KRW,SGD,HKD,MXN,BRL,VND."
                },
                "date": {
                  "type": "string",
                  "description": "Optional YYYY-MM-DD for historical ECB reference rates (since 1999-01-04). Omit for live rates."
                },
                "from": {
                  "type": "string",
                  "description": "Base currency, ISO 4217 code (default USD)."
                },
                "amount": {
                  "type": "number",
                  "minimum": 0,
                  "description": "Amount in `from` to convert (default 1)."
                }
              }
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object",
              "properties": {
                "asOf": {
                  "type": "string"
                },
                "date": {
                  "type": "string"
                },
                "from": {
                  "type": "string"
                },
                "count": {
                  "type": "integer"
                },
                "rates": {
                  "type": "object",
                  "description": "code -> units of that currency per 1 `from`"
                },
                "amount": {
                  "type": "number"
                },
                "source": {
                  "type": "string"
                },
                "missing": {
                  "type": "array",
                  "items": {
                    "type": "string"
                  }
                },
                "converted": {
                  "type": "object",
                  "description": "code -> amount converted"
                },
                "fetchedAt": {
                  "type": "string"
                }
              }
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-10-24 16:37Z
Last indexed by Roundhouse
2026-10-26 17:20Z
Last enriched (probe, favicon, geo)
2026-10-21 18:16Z
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. 15 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 QuickBuild 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=QuickBuild'
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://quickbuild.quynguyenbac.workers.dev/api/fx/rate, 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.