{
  "x402Version": 2,
  "id": 12573,
  "slug": "12573",
  "resource": "https://api.carbon-cashmere.de/v1/btc-derivatives/fee-curve",
  "description": "Bitcoin smart-fee curve for 1/3/6/12/24/144-block confirmation targets + trend classification (rising/stable/falling/surging) from 2h moving average.",
  "type": "http",
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:8453",
      "payTo": "0xf8b2dD46542175AD46e14e6133340E652665F2Ee",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "amount": "20000",
      "maxTimeoutSeconds": 300
    },
    {
      "scheme": "exact",
      "network": "eip155:137",
      "payTo": "0xf8b2dD46542175AD46e14e6133340E652665F2Ee",
      "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
      "amount": "20000",
      "maxTimeoutSeconds": 300
    },
    {
      "scheme": "exact",
      "network": "eip155:42161",
      "payTo": "0xf8b2dD46542175AD46e14e6133340E652665F2Ee",
      "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
      "amount": "20000",
      "maxTimeoutSeconds": 300
    },
    {
      "scheme": "exact",
      "network": "eip155:480",
      "payTo": "0xf8b2dD46542175AD46e14e6133340E652665F2Ee",
      "asset": "0x79A02482A880bCE3F13e09Da970dC34db4CD24d1",
      "amount": "20000",
      "maxTimeoutSeconds": 300
    },
    {
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "payTo": "GgS891nMiEETjBEFw1QQxVcAqsRV34mDYpxh24TrpCiD",
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "amount": "20000",
      "maxTimeoutSeconds": 300
    },
    {
      "scheme": "exact",
      "network": "algorand:wGHE2Pwdvd7S12BL5FaOP20EGYesN73ktiC1qzkkit8=",
      "payTo": "5GRGZVUNRF2S4BY2TNRBCUCKUOT3H6BP56ACPCZVGR3ISTTRRSSB2RGJGI",
      "asset": "31566704",
      "amount": "20000",
      "maxTimeoutSeconds": 300
    },
    {
      "scheme": "exact",
      "network": "stellar:pubnet",
      "payTo": "GDYFWCUFLG7MZAITOOVITYDNCLVJXWJ7OASYJAJPPOTONUQRNBCRO2VP",
      "asset": "USDC:GA5ZSEJYB37JRC5AVCIA5MOP4RHTM335X2KGX3IHOJAPP5RE34K4KZVN",
      "amount": "200000",
      "maxTimeoutSeconds": 300
    }
  ],
  "outputSchema": {
    "bazaar": {
      "info": {
        "input": {
          "method": "GET",
          "type": "http"
        },
        "output": {
          "example": {},
          "type": "json"
        }
      },
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "input": {
            "additionalProperties": false,
            "properties": {
              "method": {
                "enum": [
                  "GET",
                  "HEAD",
                  "DELETE"
                ],
                "type": "string"
              },
              "queryParams": {
                "properties": {},
                "type": "object"
              },
              "type": {
                "const": "http",
                "type": "string"
              }
            },
            "required": [
              "type",
              "method"
            ],
            "type": "object"
          },
          "output": {
            "properties": {
              "example": {
                "type": "object"
              },
              "type": {
                "type": "string"
              }
            },
            "required": [
              "type"
            ],
            "type": "object"
          }
        },
        "required": [
          "input"
        ],
        "type": "object"
      }
    },
    "eip2612GasSponsoring": {
      "info": {
        "description": "The facilitator accepts EIP-2612 gasless Permit to Permit2 canonical contract.",
        "version": "1"
      },
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "amount": {
            "description": "The amount to approve (uint256).",
            "pattern": "^[0-9]+$",
            "type": "string"
          },
          "asset": {
            "description": "The address of the ERC-20 token contract.",
            "pattern": "^0x[a-fA-F0-9]{40}$",
            "type": "string"
          },
          "deadline": {
            "description": "The timestamp at which the signature expires.",
            "pattern": "^[0-9]+$",
            "type": "string"
          },
          "from": {
            "description": "The address of the sender.",
            "pattern": "^0x[a-fA-F0-9]{40}$",
            "type": "string"
          },
          "nonce": {
            "description": "The current EIP-2612 nonce of the sender.",
            "pattern": "^[0-9]+$",
            "type": "string"
          },
          "signature": {
            "description": "The 65-byte concatenated signature (r, s, v) as a hex string.",
            "pattern": "^0x[a-fA-F0-9]+$",
            "type": "string"
          },
          "spender": {
            "description": "The address of the spender (Canonical Permit2).",
            "pattern": "^0x[a-fA-F0-9]{40}$",
            "type": "string"
          },
          "version": {
            "description": "Schema version identifier.",
            "pattern": "^[0-9]+(\\.[0-9]+)*$",
            "type": "string"
          }
        },
        "required": [
          "from",
          "asset",
          "spender",
          "amount",
          "nonce",
          "deadline",
          "signature",
          "version"
        ],
        "type": "object"
      }
    },
    "erc20ApprovalGasSponsoring": {
      "info": {
        "description": "The facilitator accepts a raw signed approval transaction and will sponsor the gas fees.",
        "version": "1"
      },
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "amount": {
            "description": "Approval amount (uint256).",
            "pattern": "^[0-9]+$",
            "type": "string"
          },
          "asset": {
            "description": "The ERC-20 token contract address to approve.",
            "pattern": "^0x[a-fA-F0-9]{40}$",
            "type": "string"
          },
          "from": {
            "description": "The address of the sender.",
            "pattern": "^0x[a-fA-F0-9]{40}$",
            "type": "string"
          },
          "signedTransaction": {
            "description": "RLP-encoded signed transaction calling ERC20.approve().",
            "pattern": "^0x[a-fA-F0-9]+$",
            "type": "string"
          },
          "spender": {
            "description": "The address of the spender (Canonical Permit2).",
            "pattern": "^0x[a-fA-F0-9]{40}$",
            "type": "string"
          },
          "version": {
            "description": "Schema version identifier.",
            "pattern": "^[0-9]+(\\.[0-9]+)*$",
            "type": "string"
          }
        },
        "required": [
          "from",
          "asset",
          "spender",
          "amount",
          "signedTransaction",
          "version"
        ],
        "type": "object"
      }
    },
    "offer-receipt": {
      "info": {
        "offers": [
          {
            "acceptIndex": 0,
            "format": "eip712",
            "payload": {
              "amount": "20000",
              "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
              "network": "eip155:8453",
              "payTo": "0xf8b2dD46542175AD46e14e6133340E652665F2Ee",
              "resourceUrl": "https://api.carbon-cashmere.de/v1/btc-derivatives/fee-curve",
              "scheme": "exact",
              "validUntil": 1788946234,
              "version": 1
            },
            "signature": "0xcb38015369f2609fc1b67f9b995c5f2ea22a76ae04f0cb0eefcbfefb2964d8cc272042830891e705d3b4c003f9914748a9b564ff8884da58729d4984146bf6d21c"
          },
          {
            "acceptIndex": 1,
            "format": "eip712",
            "payload": {
              "amount": "20000",
              "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
              "network": "eip155:137",
              "payTo": "0xf8b2dD46542175AD46e14e6133340E652665F2Ee",
              "resourceUrl": "https://api.carbon-cashmere.de/v1/btc-derivatives/fee-curve",
              "scheme": "exact",
              "validUntil": 1788946234,
              "version": 1
            },
            "signature": "0xdf034e9930c7be404f7ca7f11b549e44f9adeecf3664bf48d9e12c20344d77680b41492a0ac59280fd72fbdf8aaaeac7a37693f120a5fca8bafc6a6de6a9a9921b"
          },
          {
            "acceptIndex": 2,
            "format": "eip712",
            "payload": {
              "amount": "20000",
              "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
              "network": "eip155:42161",
              "payTo": "0xf8b2dD46542175AD46e14e6133340E652665F2Ee",
              "resourceUrl": "https://api.carbon-cashmere.de/v1/btc-derivatives/fee-curve",
              "scheme": "exact",
              "validUntil": 1788946234,
              "version": 1
            },
            "signature": "0x2bc358df9c56f76f38dfb8a5cf97f604a90b701973763c807237f4764ae63f4775e2aacda06f0587e6dd7bd42469921f299fc80ec84bf147b4051806950692801b"
          },
          {
            "acceptIndex": 3,
            "format": "eip712",
            "payload": {
              "amount": "20000",
              "asset": "0x79A02482A880bCE3F13e09Da970dC34db4CD24d1",
              "network": "eip155:480",
              "payTo": "0xf8b2dD46542175AD46e14e6133340E652665F2Ee",
              "resourceUrl": "https://api.carbon-cashmere.de/v1/btc-derivatives/fee-curve",
              "scheme": "exact",
              "validUntil": 1788946234,
              "version": 1
            },
            "signature": "0x96a175e29082ed9b3341c3ac563cb5769d7efe76e233d041f4ea782360859bd35e088fcecbca7e9a486137513d8748f15d0023ac1598ccdb33e02765e4c805001c"
          },
          {
            "acceptIndex": 4,
            "format": "eip712",
            "payload": {
              "amount": "20000",
              "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
              "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
              "payTo": "GgS891nMiEETjBEFw1QQxVcAqsRV34mDYpxh24TrpCiD",
              "resourceUrl": "https://api.carbon-cashmere.de/v1/btc-derivatives/fee-curve",
              "scheme": "exact",
              "validUntil": 1788946234,
              "version": 1
            },
            "signature": "0xa2364680135d23a3f144304af2da8dc5da1ce13d785343178bf87e68d0311cfd2ac9982ef59bf30c21fa19ab371411a7ddfa4e46faa202c54702751d30f983121b"
          },
          {
            "acceptIndex": 5,
            "format": "eip712",
            "payload": {
              "amount": "20000",
              "asset": "31566704",
              "network": "algorand:wGHE2Pwdvd7S12BL5FaOP20EGYesN73ktiC1qzkkit8=",
              "payTo": "5GRGZVUNRF2S4BY2TNRBCUCKUOT3H6BP56ACPCZVGR3ISTTRRSSB2RGJGI",
              "resourceUrl": "https://api.carbon-cashmere.de/v1/btc-derivatives/fee-curve",
              "scheme": "exact",
              "validUntil": 1788946234,
              "version": 1
            },
            "signature": "0x341019731754e45b4184564f616a10823209c76847ce6f67130cdd9c316458a02191b003747e381b07f9b030f9bea9013354be12fbb3716a7400977b9395ce1d1c"
          },
          {
            "acceptIndex": 6,
            "format": "eip712",
            "payload": {
              "amount": "200000",
              "asset": "USDC:GA5ZSEJYB37JRC5AVCIA5MOP4RHTM335X2KGX3IHOJAPP5RE34K4KZVN",
              "network": "stellar:pubnet",
              "payTo": "GDYFWCUFLG7MZAITOOVITYDNCLVJXWJ7OASYJAJPPOTONUQRNBCRO2VP",
              "resourceUrl": "https://api.carbon-cashmere.de/v1/btc-derivatives/fee-curve",
              "scheme": "exact",
              "validUntil": 1788946234,
              "version": 1
            },
            "signature": "0x068fd63ed857f27aed927bbf963f0ea200e57589e912c7bae0295f099ca75e7359a15ebf97956d974560ff4ee742b9eb4d6469b1dc5b8a1cddeb819bd08a61661b"
          }
        ]
      },
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "format": {
            "enum": [
              "eip712",
              "jws"
            ],
            "type": "string"
          },
          "payload": {
            "type": "object"
          },
          "signature": {
            "type": "string"
          }
        },
        "required": [
          "format",
          "payload",
          "signature"
        ],
        "type": "object"
      }
    },
    "payment-identifier": {
      "info": {
        "required": false
      },
      "schema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "id": {
            "maxLength": 128,
            "minLength": 16,
            "pattern": "^[a-zA-Z0-9_-]+$",
            "type": "string"
          },
          "required": {
            "type": "boolean"
          }
        },
        "required": [
          "required"
        ],
        "type": "object"
      }
    }
  },
  "tags": [
    "bazaar",
    "eip2612GasSponsoring",
    "erc20ApprovalGasSponsoring",
    "offer-receipt",
    "payment-identifier"
  ],
  "sourceHost": "api.carbon-cashmere.de",
  "lastUpdated": "2026-09-09T08:30:34.823Z",
  "quality": {
    "calls30d": 1,
    "uniquePayers30d": 1,
    "lastCalledAt": "2026-09-09T08:30:34.619Z"
  },
  "liveness": {},
  "verified": false,
  "featured": false,
  "provider": {
    "host": "api.carbon-cashmere.de",
    "manifest_name": "api.carbon-cashmere.de",
    "source": "cdp-mirror",
    "source_manifest_url": "https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources",
    "submitted_at": "2026-09-18T22:00:31.484Z"
  }
}