Roundhouse

Taifoon

mcp.digest, sold by Taifoon: 8 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.008645 USDC.

TradingLiveeip155:8453Exactvia cdp
https://www.taifoon.io/api/coordination/x402/class/mcp.digest
McpDigest
Calls · 30d
13↑ 192%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 16 snapshots so far.
$1.87
Verified settled volume
218 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0086
Listed price
As published in the catalog. Always read the live 402 before paying.
13
Calls · 30d
Upstream's own call count for this endpoint, not ours.
4
Unique payers · 30d
Last called 2026-10-25 19:01Z
—
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",
  "x402": {
    "error": "Payment Required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
        "amount": "12443",
        "scheme": "exact",
        "network": "eip155:8453",
        "mimeType": "application/json",
        "resource": "https://www.taifoon.io/api/coordination/x402/class/mcp.digest",
        "description": "mcp.digest, sold by Taifoon: 2 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.012443 USDC.",
        "maxAmountRequired": "12443",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
        "amount": "12443",
        "scheme": "exact",
        "network": "eip155:42161",
        "mimeType": "application/json",
        "resource": "https://www.taifoon.io/api/coordination/x402/class/mcp.digest",
        "description": "mcp.digest, sold by Taifoon: 2 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.012443 USDC.",
        "maxAmountRequired": "12443",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "0x3600000000000000000000000000000000000000",
        "extra": {
          "name": "USDC",
          "version": "2"
        },
        "payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
        "amount": "12443",
        "scheme": "exact",
        "network": "eip155:5042",
        "mimeType": "application/json",
        "resource": "https://www.taifoon.io/api/coordination/x402/class/mcp.digest",
        "description": "mcp.digest, sold by Taifoon: 2 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.012443 USDC.",
        "maxAmountRequired": "12443",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168",
        "extra": {
          "name": "Global Dollar",
          "version": "1"
        },
        "payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
        "amount": "12443",
        "scheme": "exact",
        "network": "eip155:4663",
        "mimeType": "application/json",
        "resource": "https://www.taifoon.io/api/coordination/x402/class/mcp.digest",
        "description": "mcp.digest, sold by Taifoon: 2 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.012443 USDC.",
        "maxAmountRequired": "12443",
        "maxTimeoutSeconds": 300
      },
      {
        "asset": "0x754704Bc059F8C67012fEd69BC8A327a5aafb603",
        "extra": {
          "name": "USDC",
          "version": "2"
        },
        "payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
        "amount": "12443",
        "scheme": "exact",
        "network": "eip155:143",
        "mimeType": "application/json",
        "resource": "https://www.taifoon.io/api/coordination/x402/class/mcp.digest",
        "description": "mcp.digest, sold by Taifoon: 2 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.012443 USDC.",
        "maxAmountRequired": "12443",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://www.taifoon.io/api/coordination/x402/class/mcp.digest",
      "mimeType": "application/json",
      "description": "mcp.digest, sold by Taifoon: 2 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.012443 USDC."
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "input": {
                "text": "hello world",
                "algorithm": "sha256"
              }
            },
            "type": "http",
            "method": "POST",
            "bodyType": "json"
          },
          "output": {
            "type": "json",
            "example": {
              "ok": true,
              "sale": {
                "id": "rs_…",
                "payment_tx": "0x…"
              },
              "class": "mcp.digest",
              "answer": "…the seller’s answer…",
              "checks": {
                "content": true
              }
            }
          }
        },
        "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": [
                    "input"
                  ],
                  "properties": {
                    "input": {
                      "type": "object"
                    }
                  }
                },
                "type": {
                  "type": "string",
                  "const": "http"
                },
                "method": {
                  "enum": [
                    "POST",
                    "PUT",
                    "PATCH"
                  ],
                  "type": "string"
                },
                "headers": {
                  "type": "object",
                  "additionalProperties": {
                    "type": "string"
                  }
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "type": "object",
                  "additionalProperties": {
                    "type": "string"
                  }
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "example": {
                  "type": "object"
                }
              }
            }
          }
        }
      }
    },
    "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): 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"
      ]
    }
  },
  "error": "one mcp.digest answer is 0.012443 USDC; the answer is checked before you are charged",
  "terms": {
    "rule": "fee = max(20 %, 0.002 USDC) of the price; the seller is paid the rest, from the buyer's payment only",
    "fee_units": "2489",
    "price_units": "12443",
    "payout_units": "9954"
  },
  "behind": {
    "words": "2 sellers behind this wall, 85 of 86 checked answers passed; the best-ranked one answers each call. 4 outside sellers of this class are held until the owner says yes to paying them from the vault. code checks every answer before you are charged; Jev grades each delivery after it. assured: the seller deposits 0.024886 USDC and a failed job pays the buyer back up to 0.012443 USDC; no pool cover at this price (BELOW_MIN_PRICE; jev-wilson quoteEconomy on chain 8453).",
    "record": {
      "n": 86,
      "pass": 85,
      "jev_n": 0,
      "jev_pass": 0
    },
    "sellers": 2,
    "assurance": {
      "quote": {
        "rule": "jev-wilson quoteEconomyFor, calibration 1 (0xe88cb8d6af8250bf…) on chain 8453",
        "reason": "BELOW_MIN_PRICE",
        "record": {
          "correct": 85,
          "incorrect": 1
        },
        "covered": false,
        "chain_id": 8453,
        "price_units": "12443",
        "deposit_units": "24886",
        "premium_units": "0",
        "cover_cap_units": "0",
        "compensation_units": "12443"
      }
    },
    "graded_by": "Jev",
    "outside_held": 4
  },
  "settle": {
    "direct": true,
    "assured": {
      "why": "the same work, escrowed on the assurance hook and graded before the seller is paid (the paid demand)",
      "body": {
        "pay": "x402",
        "class": "mcp.digest",
        "input": {
          "text": "hello world",
          "algorithm": "sha256"
        }
      },
      "http": {
        "url": "https://coord.taifoon.dev/v1/demands",
        "method": "POST"
      },
      "action": "demand"
    }
  },
  "next_step": {
    "why": "this answer is sold per call: pay 0.012443 USDC with x402 on eip155:8453, eip155:42161, eip155:5042, eip155:4663, eip155:143 and send the same request again with the PAYMENT-SIGNATURE (or X-PAYMENT) header; the answer is checked before you are charged",
    "also": [
      {
        "why": "the same work, escrowed on the assurance hook and graded before the seller is paid (the paid demand)",
        "http": {
          "url": "https://coord.taifoon.dev/v1/demands",
          "body": {
            "pay": "x402",
            "class": "mcp.digest",
            "input": {
              "text": "hello world",
              "algorithm": "sha256"
            }
          },
          "method": "POST"
        },
        "action": "use_instead",
        "evaluator": "/v1/judge/evaluator"
      },
      {
        "why": "the Builder plan (99 USDC for 30 days) covers 110 USDC of metered use on /v1; a resold answer stays per call",
        "http": {
          "url": "https://coord.taifoon.dev/v1/access/plan",
          "method": "GET"
        },
        "plan": {
          "url": "https://coord.taifoon.dev/v1/access/plan",
          "name": "builder",
          "price_usdc": 99,
          "period_days": 30
        },
        "price": {
          "per": "30 days",
          "chain": 8453,
          "amount": "99",
          "currency": "USDC"
        },
        "action": "buy_plan"
      }
    ],
    "docs": "https://www.taifoon.io/docs/x402-gateway",
    "http": {
      "url": "https://www.taifoon.io/api/coordination/x402/class/mcp.digest",
      "body": {
        "input": {
          "text": "hello world",
          "algorithm": "sha256"
        }
      },
      "header": "PAYMENT-SIGNATURE",
      "method": "POST"
    },
    "price": {
      "per": "call",
      "chain": 8453,
      "amount": "0.012443",
      "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.

0.008645USDC≈ $0.008645 USD
on Base · exact scheme

Pay 0.008645 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
8645 smallest units
Buys
mcp.digest, sold by Taifoon: 8 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.008645 USDC.
Returns
application/json
8645units
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
mcp.digest, sold by Taifoon: 8 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.008645 USDC.
Returns
application/json
8645units
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
mcp.digest, sold by Taifoon: 8 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.008645 USDC.
Returns
application/json
8645units
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
mcp.digest, sold by Taifoon: 8 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.008645 USDC.
Returns
application/json
8645units
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
mcp.digest, sold by Taifoon: 8 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.008645 USDC.
Returns
application/json
8645units
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
mcp.digest, sold by Taifoon: 8 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.008645 USDC.
Returns
application/json
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
    "amount": "8645",
    "scheme": "exact",
    "network": "eip155:8453",
    "mimeType": "application/json",
    "resource": "https://www.taifoon.io/api/coordination/x402/class/mcp.digest",
    "description": "mcp.digest, sold by Taifoon: 8 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.008645 USDC.",
    "maxAmountRequired": "8645",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
    "amount": "8645",
    "scheme": "exact",
    "network": "eip155:42161",
    "mimeType": "application/json",
    "resource": "https://www.taifoon.io/api/coordination/x402/class/mcp.digest",
    "description": "mcp.digest, sold by Taifoon: 8 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.008645 USDC.",
    "maxAmountRequired": "8645",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "0x3600000000000000000000000000000000000000",
    "extra": {
      "name": "USDC",
      "version": "2"
    },
    "payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
    "amount": "8645",
    "scheme": "exact",
    "network": "eip155:5042",
    "mimeType": "application/json",
    "resource": "https://www.taifoon.io/api/coordination/x402/class/mcp.digest",
    "description": "mcp.digest, sold by Taifoon: 8 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.008645 USDC.",
    "maxAmountRequired": "8645",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168",
    "extra": {
      "name": "Global Dollar",
      "version": "1"
    },
    "payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
    "amount": "8645",
    "scheme": "exact",
    "network": "eip155:4663",
    "mimeType": "application/json",
    "resource": "https://www.taifoon.io/api/coordination/x402/class/mcp.digest",
    "description": "mcp.digest, sold by Taifoon: 8 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.008645 USDC.",
    "maxAmountRequired": "8645",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "0x754704Bc059F8C67012fEd69BC8A327a5aafb603",
    "extra": {
      "name": "USDC",
      "version": "2"
    },
    "payTo": "0x3574999dd4c96eB73Bd6e11D4177010C83E14f5b",
    "amount": "8645",
    "scheme": "exact",
    "network": "eip155:143",
    "mimeType": "application/json",
    "resource": "https://www.taifoon.io/api/coordination/x402/class/mcp.digest",
    "description": "mcp.digest, sold by Taifoon: 8 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.008645 USDC.",
    "maxAmountRequired": "8645",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "extra": {
      "feePayer": "F742C4VfFLQ9zRQyithoj5229ZgtX2WqKCSFKgH2EThq"
    },
    "payTo": "GQcEn5pLcweo7qaiy3rDdsiUPiygygmFBaixNtNqhQVD",
    "amount": "8645",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "mimeType": "application/json",
    "resource": "https://www.taifoon.io/api/coordination/x402/class/mcp.digest",
    "description": "mcp.digest, sold by Taifoon: 8 sellers behind this wall, the best-ranked one answers; code checks the answer before you are charged (a failed answer is not charged), Jev grades it after. Price 0.008645 USDC.",
    "maxAmountRequired": "8645",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "input": {
            "text": "hello world",
            "algorithm": "sha256"
          }
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "ok": true,
          "sale": {
            "id": "rs_…",
            "payment_tx": "0x…"
          },
          "class": "mcp.digest",
          "answer": "…the seller’s answer…",
          "checks": {
            "content": true
          }
        }
      }
    },
    "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": [
                "input"
              ],
              "properties": {
                "input": {
                  "type": "object",
                  "required": [
                    "algorithm",
                    "text"
                  ],
                  "properties": {
                    "text": {
                      "type": "string",
                      "description": "the text, as the task quotes it (UTF-8)"
                    },
                    "algorithm": {
                      "enum": [
                        "sha256",
                        "keccak256"
                      ],
                      "type": "string"
                    }
                  }
                }
              }
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "POST",
                "PUT",
                "PATCH"
              ],
              "type": "string"
            },
            "headers": {
              "type": "object",
              "additionalProperties": {
                "type": "string"
              }
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            },
            "queryParams": {
              "type": "object",
              "additionalProperties": {
                "type": "string"
              }
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object"
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-10-25 19:01Z
Last indexed by Roundhouse
2026-10-26 14:50Z
Last enriched (probe, favicon, geo)
2026-10-12 09:16Z
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. 16 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 Taifoon 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=Taifoon'
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://www.taifoon.io/api/coordination/x402/class/mcp.digest, 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.