Roundhouse

coord.taifoon.dev

No description published for this endpoint.

TradingLiveeip155:8453Exactvia facilitator:thirdweb
https://coord.taifoon.dev/v1/x402/class/market.price
Calls · 30d
12↑ 78%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 20 snapshots so far.
$1.87
Verified settled volume
218 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0030
Listed price
As published in the catalog. Always read the live 402 before paying.
—
Calls · 30d
Upstream's own call count for this endpoint, not ours.
—
Unique payers · 30d
Never called
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider
Coming soonTaifoon proof workerERC-8004

Live 402 challenge

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

{
  "ok": false,
  "code": "payment_required",
  "hint": "pay 0.003 USDC with x402 and send the same request again with the PAYMENT-SIGNATURE (or X-PAYMENT) header; a stale price is never served and never charged",
  "x402": {
    "error": "Payment Required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
        "amount": "3000",
        "scheme": "exact",
        "network": "eip155:8453",
        "mimeType": "application/json",
        "resource": "https://coord.taifoon.dev/v1/x402/class/market.price",
        "description": "Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape holds; a price older than 180 s is never served as current (nothing is charged). BTC, ETH, SOL are held to Chainlink on Base within 1 % when its feed is under 1 h old. 0.003 USDC a call.",
        "maxAmountRequired": "3000",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
        "amount": "3000",
        "scheme": "exact",
        "network": "eip155:42161",
        "mimeType": "application/json",
        "resource": "https://coord.taifoon.dev/v1/x402/class/market.price",
        "description": "Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape holds; a price older than 180 s is never served as current (nothing is charged). BTC, ETH, SOL are held to Chainlink on Base within 1 % when its feed is under 1 h old. 0.003 USDC a call.",
        "maxAmountRequired": "3000",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "0x3600000000000000000000000000000000000000",
        "extra": {
          "name": "USDC",
          "version": "2"
        },
        "payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
        "amount": "3000",
        "scheme": "exact",
        "network": "eip155:5042",
        "mimeType": "application/json",
        "resource": "https://coord.taifoon.dev/v1/x402/class/market.price",
        "description": "Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape holds; a price older than 180 s is never served as current (nothing is charged). BTC, ETH, SOL are held to Chainlink on Base within 1 % when its feed is under 1 h old. 0.003 USDC a call.",
        "maxAmountRequired": "3000",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168",
        "extra": {
          "name": "Global Dollar",
          "version": "1"
        },
        "payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
        "amount": "3000",
        "scheme": "exact",
        "network": "eip155:4663",
        "mimeType": "application/json",
        "resource": "https://coord.taifoon.dev/v1/x402/class/market.price",
        "description": "Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape holds; a price older than 180 s is never served as current (nothing is charged). BTC, ETH, SOL are held to Chainlink on Base within 1 % when its feed is under 1 h old. 0.003 USDC a call.",
        "maxAmountRequired": "3000",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "0x754704Bc059F8C67012fEd69BC8A327a5aafb603",
        "extra": {
          "name": "USDC",
          "version": "2"
        },
        "payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
        "amount": "3000",
        "scheme": "exact",
        "network": "eip155:143",
        "mimeType": "application/json",
        "resource": "https://coord.taifoon.dev/v1/x402/class/market.price",
        "description": "Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape holds; a price older than 180 s is never served as current (nothing is charged). BTC, ETH, SOL are held to Chainlink on Base within 1 % when its feed is under 1 h old. 0.003 USDC a call.",
        "maxAmountRequired": "3000",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "F742C4VfFLQ9zRQyithoj5229ZgtX2WqKCSFKgH2EThq"
        },
        "payTo": "GvwY5YcB7NqU8DMENC5A5fGKp2SDvs4Bx3r5Yu4YHLqZ",
        "amount": "3000",
        "scheme": "exact",
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "mimeType": "application/json",
        "resource": "https://coord.taifoon.dev/v1/x402/class/market.price",
        "description": "Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape holds; a price older than 180 s is never served as current (nothing is charged). BTC, ETH, SOL are held to Chainlink on Base within 1 % when its feed is under 1 h old. 0.003 USDC a call.",
        "maxAmountRequired": "3000",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://coord.taifoon.dev/v1/x402/class/market.price",
      "tags": [
        "market",
        "price"
      ],
      "iconUrl": "https://www.taifoon.io/apple-touch-icon.png",
      "mimeType": "application/json",
      "description": "Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape holds; a price older than 180 s is never served as current (nothing is charged). BTC, ETH, SOL are held to Chainlink on Base within 1 % when its feed is under 1 h old. 0.003 USDC a call.",
      "serviceName": "Taifoon"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET",
            "queryParams": {
              "symbol": "ETH"
            }
          },
          "output": {
            "type": "json",
            "example": {
              "ok": true,
              "bar": {
                "c": 2538.81,
                "h": 2539.1,
                "l": 2538.6,
                "o": 2538.88,
                "t": 1791742740,
                "v": 12.4,
                "tf": "1m"
              },
              "age_s": 41,
              "as_of": "2026-10-11T18:20:00.000Z",
              "class": "market.price",
              "fresh": true,
              "digest": "9f2c…",
              "replay": "https://clob.taifoon.dev/tape/v1/candles/ETH/1m?from=1791742740&to=1791742799",
              "source": "the Taifoon venue tape (https://clob.taifoon.dev/tape/v1/candles/ETH/1m): the close of the last closed 1-minute bar",
              "symbol": "ETH",
              "price_usd": 2538.81,
              "reference": {
                "usd": 2539.4,
                "age_s": 600,
                "source": "Chainlink ETH / USD on Base",
                "off_pct": 0.02
              }
            }
          }
        },
        "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",
                    "HEAD",
                    "DELETE"
                  ],
                  "type": "string"
                },
                "headers": {
                  "type": "object",
                  "additionalProperties": {
                    "type": "string"
                  }
                },
                "queryParams": {
                  "type": "object",
                  "required": [
                    "symbol"
                  ],
                  "properties": {
                    "symbol": {
                      "enum": [
                        "BTC",
                        "ETH",
                        "SOL",
                        "NQ",
                        "ES",
                        "YM"
                      ],
                      "type": "string",
                      "description": "the symbol to price: one the Taifoon venue tape holds"
                    }
                  },
                  "additionalProperties": {
                    "type": "string"
                  }
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "example": {
                  "type": "object",
                  "required": [
                    "symbol",
                    "price_usd",
                    "as_of",
                    "age_s",
                    "digest"
                  ],
                  "properties": {
                    "age_s": {
                      "type": "integer",
                      "description": "seconds since the bar closed; at most 180, else no price is served"
                    },
                    "as_of": {
                      "type": "string",
                      "description": "when the bar closed (ISO 8601)"
                    },
                    "digest": {
                      "type": "string",
                      "description": "sha256 over the bar’s \"t,o,h,l,c,v\" line (the market.candles digest)"
                    },
                    "replay": {
                      "type": "string",
                      "description": "the tape GET that returns the same bar"
                    },
                    "symbol": {
                      "enum": [
                        "BTC",
                        "ETH",
                        "SOL",
                        "NQ",
                        "ES",
                        "YM"
                      ],
                      "type": "string"
                    },
                    "price_usd": {
                      "type": "number"
                    }
                  }
                }
              }
            }
          }
        }
      }
    },
    "x402Version": 2,
    "without_x402": {
      "why": "x402 is settled on eip155:8453 (Base), eip155:42161 (Arbitrum One), eip155:5042 (Arc), eip155:4663 (Robinhood Chain), eip155:143 (Monad), solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp (Solana): pay the entry of the network you hold the dollar token on. A key with a balance is the other way to pay, the same price on any of them.",
      "direct": {
        "then": "send the same request with X-API-Key: it is paid from the balance at the same price",
        "quote": "GET https://www.taifoon.io/v1/access/quote?usdc=1&chainId=<id> with X-API-Key (POST /v1/register for one), then POST /v1/access/topup { tx, signature, chainId }",
        "chains": [
          "eip155:8453 (Base, USDC)",
          "eip155:42161 (Arbitrum One, USDC)",
          "eip155:5042 (Arc, USDC)",
          "eip155:4663 (Robinhood Chain, USDG)",
          "eip155:143 (Monad, USDC)"
        ],
        "for_a_person": "https://www.taifoon.io/pricing"
      },
      "settles_x402": [
        "eip155:8453",
        "eip155:42161",
        "eip155:5042",
        "eip155:4663",
        "eip155:143",
        "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
      ]
    }
  },
  "error": "one market.price answer is 0.003 USDC; the price is checked (fresh, inside the reference band) before you are charged. Note: send { symbol } (or ?symbol=)",
  "terms": {
    "per": "call",
    "basis": "market.candles' rule (lib/trading-classes priceAtomic): max(list price, measured cost x ACCESS_MARGIN_BPS). Cost of one call = one scanning read 0.0004274 USD + one facilitator settlement 0.001 USD = 0.0014274 USD; x 1.5 = 0.002142 USDC, the floor. List 0.003 USDC = the floor rounded up to a whole thousandth: above the x402 minimum (0.001) and the resale walls' least price (0.002), under the 0.01 USDC outside buyers offer for market.price on x402-base (checker/venue-map.json)",
    "class": "market.price",
    "source": "the Taifoon venue tape (clob.taifoon.dev /tape/v1/candles, the market.candles source): the close of the last closed 1-minute bar; no other feed",
    "symbols": [
      "BTC",
      "ETH",
      "SOL",
      "NQ",
      "ES",
      "YM"
    ],
    "catalogue": "https://coord.taifoon.dev/v1/products (x402.per_call)",
    "served_by": "taifoon (the venue tape)",
    "not_advice": "Facts about past prices and past fills; not advice.",
    "price_usdc": 0.003,
    "price_units": "3000",
    "fresh_max_age_s": 180
  },
  "next_step": {
    "why": "pay 0.003 USDC with x402 and send the same request again with the PAYMENT-SIGNATURE (or X-PAYMENT) header; a stale price is never served and never charged",
    "http": {
      "url": "https://coord.taifoon.dev/v1/x402/class/market.price?symbol=ETH",
      "header": "PAYMENT-SIGNATURE",
      "method": "GET"
    },
    "price": {
      "per": "call",
      "chain": 8453,
      "amount": "0.003",
      "currency": "USDC"
    },
    "action": "retry",
    "evaluator": "/v1/judge/evaluator"
  }
}

Accepts

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

0.003USDC≈ $0.003 USD
on Base · exact scheme

Pay 0.003 USDC on Base to 0x3574…14f5b. The signed payment is good for 5 minutes.

Paid to
0x3574…14f5b
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
3000 smallest units
Buys
Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape h…
Returns
application/json
3000units
on Arbitrum · 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
0x3574…14f5b
Token contract
0xaf88…e5831
Payment window
5 minutes
Buys
Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape h…
Returns
application/json
3000units
on eip155:5042 · 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
0x3574…14f5b
Token contract
0x3600…00000
Payment window
5 minutes
Buys
Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape h…
Returns
application/json
3000units
on eip155:4663 · 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
0x3574…14f5b
Token contract
0x5fc5…1d168
Payment window
5 minutes
Buys
Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape h…
Returns
application/json
3000units
on eip155:143 · 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
0x3574…14f5b
Token contract
0x7547…fb603
Payment window
5 minutes
Buys
Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape h…
Returns
application/json
3000units
on solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · 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
GQcEn5…qhQVD
Token contract
EPjFWd…TDt1v
Payment window
5 minutes
Buys
Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape h…
Returns
application/json
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
    "scheme": "exact",
    "network": "eip155:8453",
    "mimeType": "application/json",
    "resource": "https://coord.taifoon.dev/v1/x402/class/market.price",
    "description": "Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape h…",
    "maxAmountRequired": "3000",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
    "scheme": "exact",
    "network": "eip155:42161",
    "mimeType": "application/json",
    "resource": "https://coord.taifoon.dev/v1/x402/class/market.price",
    "description": "Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape h…",
    "maxAmountRequired": "3000",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "0x3600000000000000000000000000000000000000",
    "extra": {
      "name": "USDC",
      "version": "2"
    },
    "payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
    "scheme": "exact",
    "network": "eip155:5042",
    "mimeType": "application/json",
    "resource": "https://coord.taifoon.dev/v1/x402/class/market.price",
    "description": "Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape h…",
    "maxAmountRequired": "3000",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168",
    "extra": {
      "name": "Global Dollar",
      "version": "1"
    },
    "payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
    "scheme": "exact",
    "network": "eip155:4663",
    "mimeType": "application/json",
    "resource": "https://coord.taifoon.dev/v1/x402/class/market.price",
    "description": "Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape h…",
    "maxAmountRequired": "3000",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "0x754704Bc059F8C67012fEd69BC8A327a5aafb603",
    "extra": {
      "name": "USDC",
      "version": "2"
    },
    "payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
    "scheme": "exact",
    "network": "eip155:143",
    "mimeType": "application/json",
    "resource": "https://coord.taifoon.dev/v1/x402/class/market.price",
    "description": "Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape h…",
    "maxAmountRequired": "3000",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "extra": {
      "feePayer": "F742C4VfFLQ9zRQyithoj5229ZgtX2WqKCSFKgH2EThq"
    },
    "payTo": "GQcEn5pLcweo7qaiy3rDdsiUPiygygmFBaixNtNqhQVD",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "mimeType": "application/json",
    "resource": "https://coord.taifoon.dev/v1/x402/class/market.price",
    "description": "Latest USD price of BTC, ETH, SOL, NQ, ES, YM from the Taifoon venue tape: the close of the last closed 1-minute bar, its time, age and sha256 digest, replayable with one GET. Only symbols the tape h…",
    "maxAmountRequired": "3000",
    "maxTimeoutSeconds": 300
  }
]

Provenance

Seen in the source catalog
2026-10-21 21:48Z
Last indexed by Roundhouse
2026-10-23 20:16Z
Last enriched (probe, favicon, geo)
2026-10-14 10:46Z
x402 version
1
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. 20 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 coord.taifoon.dev 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=coord.taifoon.dev'
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://coord.taifoon.dev/v1/x402/class/market.price, 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.