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Base Gas Price & Transfer Cost Estimator
x402
Base Gas Price & Transfer Cost Estimator is a paid API for AI agents from api.x-402.online, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-22).
Returns the current Base network gas price, base fee, priority fee, and ETH cost of ETH, ERC-20, and x402 USDC transfers at that gas price.
Price / call$0.005
Success—
StatusUnknown
How this service works
Get the current Base gas price and the ETH cost of an ETH, ERC-20 or x402 USDC transfer at that price. Current Base gas: gas price, base fee, priority fee, and the ETH cost of an ETH transfer, an ERC-20 transfer and an x402 USDC settlement at that price. Query: none.
Output
A JSON object containing the current Base network gas price, base fee, priority fee in Gwei or Wei, and the computed ETH cost (in ETH and/or USD) for three transaction types: a plain ETH transfer, an ERC-20 token transfer, and an x402 USDC settlement.
Example use cases
Pre-transaction gas check for agent
“Before I send this ETH on Base, what's the current gas price and how much will the transfer cost me in ETH?”
x402 payment cost monitoring
“How much does an x402 USDC settlement currently cost in ETH on Base, and what's the priority fee right now?”
Compare ERC-20 vs ETH transfer cost
“What's the difference in gas cost right now between sending ETH and sending an ERC-20 token on Base?”
Technical details
Endpoint
GEThttps://api.x-402.online/v1/chain/gas?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need real-time Base L2 gas fee data specifically, especially when estimating the ETH cost of x402 USDC settlements or comparing ETH vs ERC-20 transfer costs on Base. Prefer this over generic Ethereum mainnet gas APIs when operating on Base chain or building x402-compatible payment flows.
Side effects
- Base RPC node unavailable — service may return 503 or stale data
- Network congestion causing momentary data inconsistency
- Occasional latency spikes if gas oracle is slow to respond
- Invalid or unexpected response shape if Base undergoes a hard fork changing gas mechanics
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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