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Riley Craig x402 Agent Store — Estimate Gas
x402
Riley Craig x402 Agent Store — Estimate Gas is a paid API for AI agents from x402-agent-store.rileycraig14.workers.dev, paid per call via x402, $0.09/call, status unknown (last checked 2026-09-15).
Estimates the gas units required for an EVM transaction on Base, Ethereum, Optimism, Arbitrum, Polygon, or Gnosis — payable per call in USDC via x402, no API key needed.
Price / call$0.09
Success—
StatusUnknown
How this service works
Estimate the gas a transaction will use via eth_estimateGas — the pre-send read every tx-building, trading and settlement agent makes to size gas and avoid out-of-gas reverts. Pass from/to/value/data. Across Base, Ethereum, Optimism, Arbitrum, Polygon, Gnosis. Free public RPC; undercuts onesource at $0.001 on 6 chains.
Output
Returns a JSON object with the estimated gas units (e.g. {"gas": 21000, "chain": "base"}) — the raw unit count required to execute the transaction, not converted to ETH or USD.
Example use cases
Example prompt
“What's the estimated gas for a transaction from 0xAbCd...1234 to the Uniswap router at 0x1234...5678 with calldata 0xa9059cbb... and zero ETH value on Base?”
Technical details
Endpoint
GEThttps://x402-agent-store.rileycraig14.workers.dev/chain/estimate-gasWhen to prefer
Use this endpoint when an AI agent needs a quick, on-demand gas estimate for any EVM-compatible chain without managing RPC credentials or API keys. Ideal for pre-flight checks before submitting transactions, cost estimation in DeFi workflows, or validating that a smart contract call won't run out of gas. The pay-per-call x402 model makes it suitable for ephemeral agent usage without subscription overhead.
Side effects
- Invalid or missing 'to' address returns an error response
- Unsupported chain string returns an error or falls back to Base
- Malformed calldata may cause estimation to fail or return an inflated estimate
- Insufficient USDC balance or payment failure blocks the request with a 402
- RPC node unavailability may cause timeouts or 5xx errors
- If the transaction would revert on-chain, gas estimation may fail with an execution error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"gas": 21000,
"chain": "base"
}
}Tags
x402
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