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mirrored listing x402 eip155:8453eip155:137

Gas sponsorship for one ERC-4337 user operation on Base (EntryPoint v0

Gas sponsorship for one ERC-4337 user operation on Base (EntryPoint v0.8). Price = max($0.03, 1.3× the op's gas cap); this is the floor — send your user operation to get the exact quote. Bodies this URL accepts: {sender, calls[, redelegate:true]} (plain wallet, EIP-7702) | {userOperation} unsigned (any EntryPoint v0.8 smart account, bring your own operation) | JSON-RPC ERC-7677. Then POST the signed operation back here; we submit it. GET this URL?docs=1 for details. Quote valid 600s.

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30000 (raw units)
price
1
calls / 30d
1
unique payers
2026-09-17
updated

Provider

api.liquidagent.ai · discovered, not yet claimed by its owner

Payment (x402 accepts[])

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x487b28A4FbbA8Cf46eb6E1d72e6959202Bb75e90",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "30000",
    "maxTimeoutSeconds": 60
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "payTo": "0x487b28A4FbbA8Cf46eb6E1d72e6959202Bb75e90",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "30000",
    "maxTimeoutSeconds": 60
  }
]

Output schema

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "method": "pm_getPaymasterData",
          "params": [
            {
              "callData": "0x",
              "callGasLimit": "0x30d40",
              "maxFeePerGas": "0x5f5e100",
              "maxPriorityFeePerGas": "0xf4240",
              "nonce": "0x0",
              "preVerificationGas": "0x13880",
              "sender": "0xYourSmartAccount",
              "verificationGasLimit": "0x186a0"
            },
            "0x4337084D9E255Ff0702461CF8895CE9E3b5Ff108",
            "0x2105",
            {
              "x402": "<payment object>"
            }
          ]
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      },
      "output": {
        "example": {
          "paymaster": "0x9676897C3BF08977Cdbe78213F84e72A29b844eC",
          "paymasterData": "0x…",
          "paymasterPostOpGasLimit": "0x0",
          "paymasterVerificationGasLimit": "0xea60",
          "validUntil": 1790000000
        },
        "type": "json"
      }
    },
    "schema": {
      "properties": {
        "input": {
          "properties": {
            "body": {
              "properties": {
                "method": {
                  "const": "pm_getPaymasterData"
                },
                "params": {
                  "description": "[userOperation, entryPoint, chainId, context] per ERC-7677; put the x402 payment object in context.x402",
                  "type": "array"
                }
              },
              "required": [
                "method",
                "params"
              ],
              "type": "object"
            },
            "method": {
              "const": "POST"
            },
            "type": {
              "const": "http"
            }
          },
          "type": "object"
        },
        "output": {
          "properties": {
            "example": {
              "paymaster": "0x9676897C3BF08977Cdbe78213F84e72A29b844eC",
              "paymasterData": "0x…",
              "paymasterPostOpGasLimit": "0x0",
              "paymasterVerificationGasLimit": "0xea60",
              "validUntil": 1790000000
            },
            "type": {
              "const": "json"
            }
          },
          "type": "object"
        }
      },
      "type": "object"
    }
  }
}

Use it

curl

curl "https://api.liquidagent.ai/v1/gas"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://api.liquidagent.ai/v1/gas");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://api.liquidagent.ai/v1/gas")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Machine-readable

Everything on this page is also available as clean JSON at /resources/9099.json, and this resource appears in /discovery/resources and /discovery/search.