$0.001
per call · USD Coin on Base
Base gas oracle from Otto's own RPC: current base fee (wei+gwei), legacy gas price, and slow/standard/fast EIP-1559 priority-fee tiers (p25/p50/p90 over the last 20 blocks) with a ready-to-sign maxFeePerGas per tier. Unlike the crowded gas shelf it PUBLISHES the formula, so every tier is reproducible from the response. Flat JSON, refreshed every minute. Base gas oracle, gas price, priority fee, EIP-1559, maxFeePerGas. $0.001 per call.
Endpoint
GET https://x402.ottoai.services/gas-oracle4
Calls / 30d
3
Unique payers / 30d
Sep 8
Last called
exact
Payment scheme
Call this service
import { wrapFetchWithPayment } from "@x402/fetch";
import { privateKeyToAccount } from "viem/accounts";
const account = privateKeyToAccount(process.env.PRIVATE_KEY);
const fetchWithPay = wrapFetchWithPayment(fetch, account);
const res = await fetchWithPay("https://x402.ottoai.services/gas-oracle", {
method: "GET",
});
const data = await res.json();curl -X GET \
"https://x402.ottoai.services/gas-oracle" \
-H "X-PAYMENT: <signed x402 payment>"Example response
{
"data": {
"baseFeePerGas": {
"gwei": 0.005,
"wei": "5000000"
},
"chain": "base",
"chainId": 8453,
"formula": "priorityFee tiers = mean of the p25/p50/p90 priority-fee tips over the last 20 blocks (eth_feeHistory); suggested maxFeePerGas = baseFeePerGas*2 + tierTip.",
"gasPrice": {
"gwei": 0.006,
"wei": "6000000"
},
"generatedAt": "2026-09-01T12:01:00.000Z",
"priorityFeePerGas": {
"fast": 0.0025,
"slow": 0,
"standard": 0.00025,
"unit": "gwei"
},
"suggested": {
"fast": {
"maxFeePerGasGwei": 0.0125,
"maxFeePerGasWei": "12500000",
"maxPriorityFeePerGasGwei": 0.0025
},
"slow": {
"maxFeePerGasGwei": 0.01,
"maxFeePerGasWei": "10000000",
"maxPriorityFeePerGasGwei": 0
},
"standard": {
"maxFeePerGasGwei": 0.01025,
"maxFeePerGasWei": "10250000",
"maxPriorityFeePerGasGwei": 0.00025
}
},
"window": {
"avgGasUsedRatio": 0.1132,
"blocks": 20,
"congestion": "low",
"oldestBlock": 50738536
}
},
"meta": {
"degraded": false,
"generatedAt": "",
"stalenessSec": 0,
"validUntil": ""
},
"status": "success"
}Payment details
0x0e84ddedaae6a779c462c22a59f301ec31b6b808USD Coin · 0x833589fcd6edb6e08f4c7c32d4f71b54bda02913Is this your API?
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