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Base Gas & Fee Oracle (Live On-Chain)
x402
Base Gas & Fee Oracle (Live On-Chain) is a paid API for AI agents from x402-data-api.bodhinindustries.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).
Returns live Base network gas prices, fee tiers (slow/avg/fast), next-block base fee prediction, congestion status, and self-computed ETH/USD price — all derived directly from the Base blockchain with no third-party data.
Price / call$0.01
Success—
StatusUnknown
How this service works
Self-computed Base onchain toolkit for AI agents: ERC-20 safety scan, manipulation-resistant TWAP price oracle, gas/fee oracle, calldata decoder, token/address/contract intel, wallet approval-risk audit, and batch token triage — all computed live from raw Base chain, no third-party data.
Output
Returns current Base block height, base fee and predicted next-block base fee in gwei, three fee tiers (slow/avg/fast) each with maxFeePerGas, maxPriorityFeePerGas, and estimated USD cost, a self-computed ETH/USD spot price from Uniswap v3 on-chain, and a congestion/trend summary (direction: rising|falling|flat, congestion: low|medium|high, % change over last 10 blocks). No third-party oracle data is used.
Example use cases
Time a transaction for cheapest fees
“I need to send some tokens on Base but I want to pay the least amount possible in gas — is the network congested right now, is the base fee going up or down, and what would a slow-tier transaction cost me in USD if I wait a bit?”
Get ETH price from on-chain data
“What is the current ETH/USD price pulled directly from on-chain data on Base — no CoinGecko or external oracles — and what block height is that price derived from?”
Pick the right fee for fast confirmation
“I have a time-sensitive transaction I need confirmed in the next block on Base — what maxFeePerGas and maxPriorityFeePerGas should I set for the fast tier, and roughly what will that cost in USD for a 21000 gas transfer?”
Technical details
Endpoint
GEThttps://x402-data-api.bodhinindustries.workers.dev/gasWhen to prefer
Use this endpoint when you need live, self-computed Base network gas fees with no dependency on third-party oracles like Etherscan or CoinGecko. Ideal for AI agents that need to price transactions, decide when to submit a tx (congestion awareness), or display current ETH/USD pricing — all sourced trustlessly from raw Base chain data. Prefer this over general Ethereum gas APIs when operating specifically on Base (chainId 8453).
Side effects
- Base RPC node unavailable — returns 5xx with no gas data
- Invalid rewardPercentiles format (e.g. non-ascending or out-of-range values) — likely returns 400 or malformed response
- gasLimit of 0 or negative may produce nonsensical USD estimates
- ETH/USD price unavailable if Uniswap v3 WETH/USDC pool cannot be read — thirdPartyDataUsed remains false but ethUsd may be null
- Payment not included or invalid x402 payment header — returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| gasLimit | integer | Gas units to price the tx for (default 21000 = a plain ETH transfer). |
| rewardPercentiles | string | Three ascending priority-fee percentiles (0–100) mapped to slow,avg,fast. Default '25,50,90'. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| block | integer | Base block height |
| chain | string | base |
| tiers | object | |
| ethUsd | number | self-computed ETH/USD from Uniswap v3 WETH/USDC |
| method | string | self_computed_eth_feeHistory |
| chainId | integer | 8453 |
| gasLimit | integer | gas units priced |
| computedAt | string | ISO-8601 timestamp |
| baseFeeTrend | object | |
| baseFeePerGasGwei | number | current base fee (gwei) |
| thirdPartyDataUsed | boolean | always false |
| nextBlockBaseFeePerGasGwei | number | predicted next-block base fee (gwei) |
Tags
x402
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