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Gas Oracle — Multi-Chain Fee Estimator
x402
Gas Oracle — Multi-Chain Fee Estimator is a paid API for AI agents from 4yearcycle.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).
Returns current gas fee estimates for Base, Ethereum, and/or Bitcoin networks in a single call.
Price / call$0.005
Success—
StatusUnknown
How this service works
Interactive Bitcoin 4-year halving cycle chart on a polar disc. Live price, 200W MA, Mayer Multiple, RSI, MACD, Pi Cycle and optional paid cycle projections.
Output
A JSON object containing a count of chains queried and an array of per-chain fee objects. EVM chains (Base, Ethereum) include baseFeeGwei, gasPriceGwei, priorityGwei tiers (fast/normal/slow), and the RPC endpoint used. Bitcoin includes satPerVb tiers (fast/normal/slow/minimum). All entries include the chain name, kind (evm or btc), and fetchedAt epoch timestamp. Data is cached server-side for 60 seconds.
Example use cases
Pre-send fee check for crypto wallet
“Before I send this Ethereum transaction, can you check the current base fee and fast priority fee on Ethereum mainnet so I know what to set?”
Bitcoin mempool cost monitoring
“What are the current Bitcoin fee tiers — slow, normal, and fast sat per vbyte — from mempool right now?”
Multi-chain fee dashboard refresh
“Pull the latest gas estimates for Base, Ethereum, and Bitcoin all at once so I can update my dashboard.”
Technical details
Endpoint
GEThttps://4yearcycle.com/x402/gas-oracleWhen to prefer
Choose this endpoint when you need real-time gas fee data across Base, Ethereum, and/or Bitcoin in a single lightweight call. It is ideal for wallets, trading bots, or automation agents that need to select an appropriate fee tier before broadcasting a transaction. Prefer it over chain-specific RPC calls when you need multi-chain coverage simultaneously, or when you need Bitcoin sat/vB estimates alongside EVM gwei data in one response.
Side effects
- Invalid chain name in query param returns an error or empty results
- Upstream RPC or mempool.space outage may cause stale or missing chain data
- Malformed chains query param (wrong delimiter or unsupported alias) may be rejected
- Payment of 0.005 USDC not provided or x402 handshake fails — returns 402 Payment Required
- Network timeout from upstream RPC results in missing chain entry
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"count": 3,
"chains": [
{
"rpc": "https://mainnet.base.org",
"kind": "evm",
"chain": "base",
"fetchedAt": 1787054938980,
"baseFeeGwei": 0.005,
"gasPriceGwei": 0.006,
"priorityGwei": {
"fast": 0.0085,
"slow": 0,
"normal": 0.001
}
},
{
"rpc": "https://ethereum-rpc.publicnode.com",
"kind": "evm",
"chain": "ethereum",
"fetchedAt": 1787054938937,
"baseFeeGwei": 0.06,
"gasPriceGwei": 0.0572,
"priorityGwei": {
"fast": 1,
"slow": 0.0001,
"normal": 0.0054
}
},
{
"kind": "btc",
"chain": "bitcoin",
"satPerVb": {
"fast": 2,
"slow": 1,
"normal": 1,
"minimum": 1
},
"fetchedAt": 1787054938881
}
]
}
}Tags
x402
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