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AgentIndex x402 Gas Price
x402
AgentIndex x402 Gas Price is a paid API for AI agents from x402.agentindex.world, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-29).
Returns current gas price, base fee, and estimated native transfer cost for a specified EVM network (Base, Ethereum, Polygon, Arbitrum, Optimism).
Price / call$0.001
Success—
StatusUnknown
How this service works
Read the live gas price, EIP-1559 base fee and estimated native-transfer cost on Base, Ethereum, Polygon, Arbitrum or Optimism. No RPC key or account. Try GET /gas-price/sample.
Output
A JSON object containing the network identity (key, name, CAIP-2 identifier), current gas price in both wei and gwei, base fee (if EIP-1559 supported), current block number, and a native transfer estimate including symbol, fee in wei, gas limit, and fee in native token units. Also includes an x402 payment receipt.
Example use cases
Pre-transaction gas check on Arbitrum
“Before I send this transaction, can you check what the current gas price is on Arbitrum and estimate what a native ETH transfer would cost in wei?”
Multi-chain gas comparison for DeFi routing
“I need to compare gas fees right now — can you pull the current gas price and base fee on Ethereum vs Polygon so I can decide which chain is cheaper to use?”
Gas monitoring for automated agent wallet ops
“Check the current gas price on Base and tell me the block number we're at — I want to know if gas is low enough to proceed with my scheduled on-chain action.”
Technical details
Endpoint
GEThttps://x402.agentindex.world/gas-price?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent needs real-time EVM gas data across Base, Ethereum, Polygon, Arbitrum, or Optimism — especially when operating in a pay-per-call context via x402/USDC on Base. Prefer it over general blockchain APIs when the agent already has x402 payment infrastructure and needs lightweight, structured gas reads without a full node or heavy SDK dependency.
Side effects
- Unsupported or misspelled network enum value returns a 400 or validation error
- Network RPC temporarily unavailable results in 503 or timeout
- Missing required method or type field in input returns schema validation error
- Insufficient USDC balance or failed x402 payment results in 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"network": {
"key": "base",
"name": "Base",
"caip2": "eip155:8453"
},
"base_fee": {
"wei": "900000",
"gwei": 0.0009
},
"gas_price": {
"wei": "1000000",
"gwei": 0.001
},
"block_number": 51500000,
"native_transfer_estimate": {
"symbol": "ETH",
"fee_wei": "21000000000",
"gas_limit": 21000,
"fee_native": 2.1e-8
}
}
}Tags
x402
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