API · x402

PAID ($0.005): Base transaction preflight

PAID ($0.005): Base transaction preflight. Simulate the supplied unsigned transaction and return success or a decoded EVM revert, gas estimate, fee values and an indicative plain-transaction USDC sponsorship estimate. No signing or broadcast. Unpaid calls do…

by api.liquidagent.ai · verified provider · updated 2026-11-08

What it does

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/76434.json for the price and payment options.
Pay. Call GET https://api.liquidagent.ai/v1/gas/preflight. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, Polygon, eip155:5042, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.005 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base, Polygon, eip155:5042

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.005	0x7475e9e0ee7c0d9f1abcaffb74f5f4e195ef3703	60s
exact	Polygon eip155:137	USDC	$0.005	0x7475e9e0ee7c0d9f1abcaffb74f5f4e195ef3703	60s
exact	eip155:5042 eip155:5042	0x3600000000000000000000000000000000000000	5000	0x7475e9e0ee7c0d9f1abcaffb74f5f4e195ef3703	60s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x7475e9e0ee7c0d9f1abcaffb74f5f4e195ef3703",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5000",
    "amountUsd": 0.005,
    "maxTimeoutSeconds": 60
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "payTo": "0x7475e9e0ee7c0d9f1abcaffb74f5f4e195ef3703",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "5000",
    "amountUsd": 0.005,
    "maxTimeoutSeconds": 60
  },
  {
    "scheme": "exact",
    "network": "eip155:5042",
    "payTo": "0x7475e9e0ee7c0d9f1abcaffb74f5f4e195ef3703",
    "asset": "0x3600000000000000000000000000000000000000",
    "amount": "5000",
    "maxTimeoutSeconds": 60
  }
]

Schemas

Output schema (JSON Schema)

"{chainId,blockNumber,success,from,senderContext,returnData?,gasEstimate,gasWithHeadroom?,fees?,sponsorshipEstimate?:{kind,priceUsd,usdcAtomic,ethUsd,l1DataFeeIncluded,validUntil,note},error?:{kind,reason,data?},_paid}"

Example shape — generated from the schema, not a captured live response

null

Examples

curl

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

Details

Provider: api.liquidagent.ai
Endpoint: https://api.liquidagent.ai/v1/gas/preflight
Machine-readable: /resources/76434.json