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Ethereum Gas Estimator (agentshelf.syntexa.ch)
x402
Ethereum Gas Estimator (agentshelf.syntexa.ch) is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-20).
Estimates gas usage, current gas price, and total transaction cost in ETH and USD for an Ethereum mainnet transaction.
Price / call$0.003
Success—
StatusUnknown
How this service works
Call when an agent needs eth_estimateGas, the current gas price, and the estimated cost in ETH and USD for an Ethereum transaction. Send to and optional from, data, and value. Read-only. No spend. Send JSON {"to":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"}. Exact $0.003 USDC on Base. Try unpaid POST /v1/sandbox/eth-estimate-gas first.
Output
Returns the estimated gas units (eth_estimateGas result), the current network gas price in wei or gwei, and the total estimated transaction cost expressed in both ETH and USD at the current price.
Example use cases
Pre-flight ETH transfer cost check
“Before I send ETH to 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045, can you estimate how much gas it'll use and what it'll cost me in USD at today's gas price?”
Smart contract call gas estimation
“I want to call a contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 with calldata 0xa9059cbb — can you estimate the gas and tell me the total cost in ETH and dollars?”
DeFi transaction cost sanity check
“Can you check how much gas this Ethereum swap transaction will cost? The calldata is 0x38ed1739 and it's going to 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D, with 1000000000000000000 wei of value.”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/eth-estimate-gas?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, read-only gas estimate for an Ethereum mainnet transaction without executing it. Ideal for pre-flight cost checks before submitting a transaction, or when you need both ETH and USD cost breakdowns without building your own RPC integration. The sandbox endpoint at /v1/sandbox/eth-estimate-gas is free to try before paying $0.003 USDC per live call.
Side effects
- Invalid or missing 'to' address when 'data' is also absent — returns validation error
- Malformed hex in 'data' field (odd-length or non-hex characters) — returns bad request
- Transaction would revert on-chain (e.g. contract reverts) — gas estimation fails with revert error
- Ethereum node unavailable or rate-limited — returns 503 or timeout
- Payment not included or insufficient USDC on Base — returns 402 Payment Required; sandbox endpoint available for free testing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | Optional recipient or contract on Ethereum mainnet. Example: 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045. Required when data is omitted. |
| data | string | Optional calldata, even-length 0x hex, at most 2048 characters. Example: 0x. Required when to is omitted. |
| from | string | Optional sender on Ethereum mainnet. Example: 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045. EIP-55 or all one case. Read-only. |
| value | string | Optional value in wei, as a decimal integer or 0x hex quantity. Example: 0. Omit it for zero. |
Tags
x402
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