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2s.io EVM Gas Oracle
x402
2s.io EVM Gas Oracle is a paid API for AI agents from 2s.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Returns real-time EVM gas price tiers (slow/standard/fast) derived from recent block priority-fee percentiles plus a transfer cost estimate, for Ethereum, Base, Polygon, Arbitrum, or Optimism.
Price / call$0.001
Success—
StatusUnknown
How this service works
Live EVM gas oracle. Returns latest block baseFeePerGas + slow/standard/fast tiers derived from priority-fee percentiles (p25/p50/p75) over the trailing 4 blocks, plus a 21,000-gas transfer cost estimate in the chain native unit. Chains: base, ethereum, polygon, arbitrum, optimism. Real-time post-training data, ~5s freshness.
Output
Returns the latest block baseFeePerGas, three gas price tiers (slow/standard/fast) derived from priority-fee percentiles (p25/p50/p75) over the trailing 4 blocks, and a 21,000-gas transfer cost estimate denominated in the chain's native unit. Data is approximately 5 seconds fresh.
Example use cases
Example prompt
“What are the current slow, standard, and fast gas prices on Ethereum right now, and how much would a basic ETH transfer cost?”
Technical details
Endpoint
GEThttps://2s.io/api/crypto/gas-oracleWhen to prefer
Use this endpoint when you need real-time, multi-tier EVM gas price data (slow/standard/fast tiers) with ~5s freshness across Base, Ethereum, Polygon, Arbitrum, or Optimism. Prefer this over static estimates or training-data-based answers when a live transaction is being prepared and accurate fee estimation matters.
Side effects
- Unsupported chain value returns 400 or validation error
- Network congestion or upstream RPC unavailability may return 5xx
- Missing required 'chain' query parameter causes request rejection
- Rate limiting if usage exceeds quota without valid x402 payment
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"chain": "base"
}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
{
"data": {
"ok": true,
"items": [
{
"block": {
"number": 47485487,
"timestamp": 1781760321000,
"baseFeePerGasWei": "5000000",
"baseFeePerGasGwei": 0.005
},
"chain": {
"key": "base",
"name": "Base",
"chainId": 8453,
"nativeSymbol": "ETH"
},
"tiers": {
"fast": {
"maxFeePerGasWei": "9750000",
"maxFeePerGasGwei": 0.0098,
"transferNativeCost": 2.1e-7,
"priorityFeePerGasWei": "4750000",
"priorityFeePerGasGwei": 0.0048
},
"slow": {
"maxFeePerGasWei": "6000000",
"maxFeePerGasGwei": 0.006,
"transferNativeCost": 1.3e-7,
"priorityFeePerGasWei": "1000000",
"priorityFeePerGasGwei": 0.001
},
"standard": {
"maxFeePerGasWei": "6152500",
"maxFeePerGasGwei": 0.0062,
"transferNativeCost": 1.3e-7,
"priorityFeePerGasWei": "1152500",
"priorityFeePerGasGwei": 0.0012
}
},
"source": {
"method": "eth_getBlockByNumber + eth_feeHistory",
"license": "public RPC; no terms beyond fair-use rate limits",
"provider": "public-evm-rpc",
"rpcEndpoint": "https://mainnet.base.org"
}
}
],
"total": 1,
"source": {
"url": "https://2s.io",
"license": "No upstream license — computed by 2s.io from public RPC",
"provider": "EVM JSON-RPC (eth_feeHistory)"
}
},
"meta": {
"cost": {
"usd": 0.001,
"tier": 0
},
"caller": "x402",
"version": null,
"endpoint": "crypto.gas-oracle",
"settlement": {
"txHash": "0x5cea61838302739f0ba91b1bb825a653a2d6229604af4e97a0afbc36ce0d6ddb",
"network": "eip155:8453",
"success": true
}
}
}Tags
x402
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