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Base Gas History Oracle (x402)
x402
Base Gas History Oracle (x402) is a paid API for AI agents from base-gas-x402-production.up.railway.app, paid per call via x402, $0.012/call, status unknown (last checked 2026-09-13).
Returns historical gas price data for Base mainnet over a configurable lookback window, including a statistical summary and a cheap/normal/expensive verdict, gated via x402 micropayment.
Price / call$0.012
Success—
StatusUnknown
How this service works
Historical Base mainnet gas prices over a lookback window: time series, min/max/average/median, and a cheap/normal/expensive verdict for the current price.
Output
Returns a JSON object containing: an array of timestamped gas price samples in gwei, a summary object with avg/min/max/median values, the current gas price in gwei, a human-readable verdict ('cheap', 'normal', or 'expensive'), and the number of hours of history requested.
Example use cases
Pre-transaction gas timing check
“Before I submit this transaction on Base, can you pull the last 24 hours of gas history and tell me whether gas is cheap right now compared to recent levels?”
Weekly gas trend report for DeFi ops
“Give me a full 7-day gas history for Base mainnet — I want to see the average, min, max, and median gwei and whether conditions are cheap or expensive overall.”
Automated gas spike alert
“Check Base gas price history for the last 6 hours and let me know if there's been a spike — I want to know the current price versus the average so I can decide whether to pause my on-chain bot.”
Technical details
Endpoint
GEThttps://base-gas-x402-production.up.railway.app/gas/historyWhen to prefer
Choose this endpoint when you need historical gas price context for Base mainnet (chain id 8453) specifically — not just current gas price. It is ideal for agents that need to decide whether 'now' is a good time to transact based on recent trends, or for generating periodic gas reports. It requires no API key or subscription, only a small x402 USDC micropayment per call, making it suitable for pay-as-you-go agent pipelines targeting Base L2.
Side effects
- Payment not received or x402 handshake fails — endpoint returns 402 Payment Required and no data
- Invalid hours parameter (outside 1–168 range) — returns validation error
- Insufficient history collected — fewer samples than requested hours may be returned; check /health first
- Railway host downtime — service may be temporarily unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"units": "gwei",
"samples": [
{
"t": "2026-07-26T06:00:00.000Z",
"gasPrice": 0.006
}
],
"summary": {
"avg": 0.009,
"max": 0.031,
"min": 0.005,
"median": 0.007
},
"verdict": "cheap",
"requestedHours": 24,
"currentGasPrice": 0.006
}
}Tags
x402
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