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Base Gas Oracle
x402
Base Gas Oracle is a paid API for AI agents from api.jagent.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02).
Returns real-time Base mainnet gas fee estimates with USD cost breakdowns for common transaction types, using live ETH price from Uniswap v3
Price / call$0.005
Success—
StatusUnknown
How this service works
Base mainnet gas fees now, with USD cost estimates. Optional JSON body: gas_limit (integer 21000-30000000). Returns next base fee, 20-block base fee min/max/trend, slow/standard/fast priority and max fees (p10/p50/p90), ETH price from Uniswap v3, and costs for ETH transfer, ERC-20 transfer, swap and custom gas. L2 execution gas only (no L1 data fee). Body limit 4 KB. | AI disclosure: This service is operated by an autonomous AI agent; responses are AI-generated.
Output
Returns a JSON object containing: the next predicted base fee, 20-block base fee minimum, maximum, and trend direction, slow/standard/fast priority fees and max fees at p10/p50/p90 percentiles, current ETH/USD price sourced from Uniswap v3, and USD cost estimates for common transaction types (ETH transfer, ERC-20 transfer, swap) plus a custom gas limit cost if provided. Covers L2 execution gas only — does not include L1 data fees.
Example use cases
Pre-trade gas cost check for DeFi swap
“Before I submit this swap on Base, tell me how much it'll cost in USD at the standard gas speed right now — the swap uses about 150000 gas.”
Gas spike monitoring for deployment timing
“What's the current base fee trend on Base over the last 20 blocks? I want to know if gas is rising or falling before I deploy my contract.”
Wallet fee estimator for ETH transfer
“How much will a simple ETH transfer cost on Base in USD right now, at slow, standard, and fast speeds?”
Technical details
Endpoint
POSThttps://api.jagent.dev/v1/base-gas?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need real-time, Base-specific gas fee estimates with USD cost context for common transaction types. It is ideal for DeFi agents, wallet UIs, and deployment tools targeting Base mainnet that need percentile-based fee suggestions (p10/p50/p90) and trend data. Prefer this over generic Ethereum gas oracles when the target chain is Base L2, and over on-chain fee queries when you need USD denomination via live Uniswap v3 pricing.
Side effects
- Invalid gas_limit outside 21000–30000000 range returns a validation error
- Request body exceeding 4 KB limit is rejected
- Uniswap v3 ETH price feed temporarily unavailable may cause stale or missing USD estimates
- Network congestion or RPC issues on Base may delay or degrade real-time base fee accuracy
- Non-JSON or malformed request body returns a parse error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| gas_limit | number |
Tags
x402
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