base-gas-x402-production.up.railway.app

{
  "properties": {
    "baseFeePerGas": {
      "description": "Base fee per gas, in gwei.",
      "example": "0.012",
      "type": "string"
    },
    "blockNumber": {
      "example": "12345678",
      "type": "string"
    },
    "chain": {
      "example": "base-mainnet",
      "type": "string"
    },
    "chainId": {
      "example": 8453,
      "type": "integer"
    },
    "estimatedTransferCost": {
      "description": "Estimated cost for the requested gasLimit (default 21000, a plain ETH transfer).",
      "properties": {
        "basis": {
          "example": "baseFee + medium priority fee",
          "type": "string"
        },
        "eth": {
          "example": "0.000000294",
          "type": "string"
        },
        "gasLimit": {
          "example": 21000,
          "type": "integer"
        },
        "gwei": {
          "example": "294",
          "type": "string"
        },
        "usd": {
          "description": "Estimated cost in US dollars, 4 significant digits. Null if the ETH/USD price is unavailable.",
          "example": "0.0007791",
          "type": [
            "string",
            "null"
          ]
        }
      },
      "type": "object"
    },
    "ethUsd": {
      "description": "ETH/USD price used for the usd figures, read on-chain from the Chainlink ETH/USD feed on Base. Null when the feed cannot be read or is stale, in which case every usd field is null too.",
      "properties": {
        "price": {
          "example": "2650.12",
          "type": "string"
        },
        "source": {
          "example": "chainlink-eth-usd-base",
          "type": "string"
        },
        "updatedAt": {
          "format": "date-time",
          "type": "string"
        }
      },
      "type": [
        "object",
        "null"
      ]
    },
    "fetchedAt": {
      "example": "2026-06-22T00:00:00.000Z",
      "format": "date-time",
      "type": "string"
    },
    "gasPrice": {
      "description": "Network gas price, in gwei.",
      "example": "0.014",
      "type": "string"
    },
    "priorityFeePerGas": {
      "description": "Priority fee tiers, in gwei.",
      "properties": {
        "high": {
          "example": "0.004",
          "type": "string"
        },
        "low": {
          "example": "0.001",
          "type": "string"
        },
        "medium": {
          "example": "0.002",
          "type": "string"
        }
      },
      "type": "object"
    },
    "rpcSource": {
      "description": "Hostname of the RPC that answered. Never the full URL.",
      "example": "mainnet.base.org",
      "type": "string"
    },
    "suggestedFees": {
      "description": "EIP-1559 fee fields ready to pass to a wallet or viem sendTransaction, as wei strings. Null only if the latest block carries no base fee. maxFeePerGas is 2 x baseFee + priority: a ceiling, not the price; the chain charges baseFee + priority and refunds the rest. Pick medium unless the transaction is urgent (high) or can wait (low).",
      "properties": {
        "basis": {
          "type": "string"
        },
        "high": {
          "properties": {
            "maxFeePerGas": {
              "example": "11010000",
              "type": "string"
            },
            "maxPriorityFeePerGas": {
              "example": "1010000",
              "type": "string"
            }
          },
          "type": "object"
        },
        "low": {
          "properties": {
            "maxFeePerGas": {
              "example": "11010000",
              "type": "string"
            },
            "maxPriorityFeePerGas": {
              "example": "1010000",
              "type": "string"
            }
          },
          "type": "object"
        },
        "medium": {
          "properties": {
            "maxFeePerGas": {
              "example": "11010000",
              "type": "string"
            },
            "maxPriorityFeePerGas": {
              "example": "1010000",
              "type": "string"
            }
          },
          "type": "object"
        },
        "unit": {
          "example": "wei",
          "type": "string"
        }
      },
      "type": [
        "object",
        "null"
      ]
    },
    "units": {
      "properties": {
        "cost": {
          "example": "gwei + ETH + USD",
          "type": "string"
        },
        "fees": {
          "example": "gwei",
          "type": "string"
        }
      },
      "type": "object"
    }
  },
  "type": "object"
}