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Gas Cost in USD
x402
Gas Cost in USD is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Estimates the USD cost of an Ethereum transaction given gas used, gas price in wei, and a caller-supplied ETH/USD price, using pure local arithmetic with no external calls.
Price / call$0.001
Success—
StatusUnknown
How this service works
Estimate gas cost in USD given used gas, price, and ETH/USD. Call when operator reports that need approximate dollar gas spend. Returns usd cost estimate (caller supplies eth price) as deterministic JSON for $0.001 USDC via x402 on Base. First-party local math only—no RPC, live market feed, API keys, storage, or mediagen. Advisory only; the caller owns capital, risk, and production controls.
Output
A deterministic JSON response containing the estimated USD gas cost, computed locally from the supplied gas_used, gas_price_wei, and eth_usd values — no live market data or RPC calls involved. The result is advisory only and reflects the caller's supplied ETH price.
Example use cases
Post-trade gas cost accounting
“My on-chain swap used 180000 gas at 8 gwei and ETH is at $3100 right now — what did the gas cost me in USD?”
Pre-flight gas budget check
“Before I submit this transaction, can you estimate the dollar gas cost? It'll use about 250000 gas at 15 gwei, and I'll treat ETH as $2800.”
Agent fleet cost monitoring
“For the last 10 transactions my agent submitted, they each used around 65000 gas at 10 gwei — with ETH at $3500, what's the USD gas cost per transaction?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/gas-cost-usdWhen to prefer
Choose this endpoint when you need a fast, purely local, deterministic USD gas cost calculation and you already have the gas_used, gas_price_wei, and an ETH/USD price on hand. Prefer it over live-feed approaches when you want no external dependencies, no API keys, and reproducible results — e.g. for post-trade accounting, pre-flight budget checks, or cost summaries in agent pipelines.
Side effects
- Missing required fields (gas_used, gas_price_wei, or eth_usd) result in a validation error
- Non-numeric or malformed gas_price_wei string causes a parsing error
- Zero or negative eth_usd price may produce a zero or nonsensical result
- Result may diverge from actual on-chain cost if caller-supplied ETH price is stale
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| eth_usd | integer | Input field: eth usd. |
| gas_used | integer | Input field: gas used. |
| gas_price_wei | string | Input field: gas price wei. |
Output
Schema · Response
{
"type": "json",
"example": {
"schema": "delx/util-gas-cost-usd/v1",
"eth_usd": 3000,
"cost_eth": 0.000021,
"cost_usd": 0.063,
"gas_used": 21000
}
}Tags
x402
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