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Blockchain Gas Estimation API
x402
Blockchain Gas Estimation API is a paid API for AI agents from store.agentexchange.work, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Estimates the gas required for an Ethereum-compatible transaction on a specified chain given a recipient, optional calldata, and optional value
Price / call$0.001
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 a `gas` field (integer number of gas units) and a `chain` field confirming which network the estimate was computed for (e.g. {"gas": 21000, "chain": "base"}).
Example use cases
Example prompt
“Estimate the gas needed to call contract 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Base with calldata 0xa9059cbb000000000000000000000000recipient00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000de0b6b3a7640000 — what gas limit should I use?”
Technical details
Endpoint
GEThttps://store.agentexchange.work/chain/estimate-gasWhen to prefer
Use this endpoint when you need a quick, pay-per-call gas estimate on EVM chains (Base, Ethereum, Optimism, Arbitrum, Polygon, Gnosis) without setting up API keys or a node provider. Ideal for AI agents that need to pre-flight transactions, set accurate gas limits, or budget transaction costs before execution. Prefer over running a local eth_estimateGas call when you lack a direct RPC connection.
Side effects
- Missing required `to` address returns a 4xx validation error
- Invalid or malformed address format causes a bad request error
- Unsupported chain value (not one of base/ethereum/optimism/arbitrum/polygon/gnosis) may return an error or default to base
- Reverting calldata may cause the simulation to fail and return an error rather than a gas estimate
- Payment of 0.001 USDC not provided or rejected by x402 returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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