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Treasury Preflight - Stablecoin Transfer Fee Quotes
x402
Treasury Preflight - Stablecoin Transfer Fee Quotes is a paid API for AI agents from preflight.admapu.xyz, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-16).
Returns real-time gas fee quotes for stablecoin (USDC/USDT) transfers across supported EVM chains, including gas units, USD cost, and quote validity window.
Price / call$0.002
Success—
StatusUnknown
How this service works
x402-paid preflight checks for stablecoin transfers.
Output
A JSON object containing an array of fee quotes, each with: the current block number, chain name, stablecoin token, fee in USD, gas units required, gas price in Gwei, native token fee amount, L1 fee in native token, native currency symbol, gas sample size used for estimation, the timestamp the quote was observed, and a validUntil timestamp indicating how long the quote remains valid (typically ~12 seconds).
Example use cases
Cheapest chain selection before payment
“I want to send USDC to someone but I'm not sure which chain to use — can you get me current gas fee quotes for Base, Arbitrum, and Optimism so I can pick the cheapest one?”
Pre-transaction cost validation for DeFi agent
“Before my agent executes the USDT transfer on Ethereum, fetch a live preflight quote so I know the exact gas cost in USD and native ETH units right now.”
Real-time fee monitoring for stablecoin treasury ops
“Get me the latest USDC transfer fee quote on Polygon, including the gas price in Gwei and how many seconds the quote is valid, so our treasury system can decide whether to proceed.”
Technical details
Endpoint
GEThttps://preflight.admapu.xyz/v1/fees?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a real-time, on-chain gas cost estimate before executing a stablecoin transfer on an EVM-compatible chain. It is specifically designed for preflight validation — checking transfer feasibility and cost before committing a transaction. Prefer this over generic gas estimator APIs when you need USD-denominated fee quotes with validity windows, L1 fee breakdowns for L2 chains, and support for both USDC and USDT across multiple EVM networks simultaneously.
Side effects
- Unsupported token type returns validation error (only USDC/USDT accepted)
- Unsupported chain name in comma-separated list causes error or is ignored
- Quote expires quickly (~12 seconds validUntil window) — stale quotes must be refreshed before use
- Payment of $0.002 USDC required per call via x402 protocol; missing payment results in 402 response
- Network congestion may cause gas estimates to shift between quote and execution
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"errors": [],
"quotes": [
{
"block": 36123456,
"chain": "base",
"token": "USDC",
"feeUsd": 0.0021,
"gasUnits": 45012,
"feeNative": "0.000000812",
"observedAt": "2026-09-30T14:00:00.000Z",
"validUntil": "2026-09-30T14:00:12.000Z",
"l1FeeNative": "0.000000281",
"gasPriceGwei": 0.0118,
"nativeSymbol": "ETH",
"gasSampleSize": 17
}
]
}
}Tags
x402
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