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HALOWERK kettenwerk Gas Fee API
x402
HALOWERK kettenwerk Gas Fee API is a paid API for AI agents from kette.netzhandwerker.de, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-13).
Returns current gas fees and estimated transaction costs for a specified EVM-compatible blockchain and transaction type
Price / call$0.002
Success—
StatusUnknown
How this service works
HALOWERK kettenwerk — bezahlte Endpunkte nach x402. Preise in USDC auf Base Mainnet.
Output
Returns gas fee data for the requested EVM chain across all three speed tiers (slow/normal/fast), along with a total cost estimate in native token and USD for the specified transaction type profile, including the assumed gas limit and calldata byte size used in the calculation.
Example use cases
DeFi swap cost check before execution
“Before I do this token swap on Polygon, can you check the current gas fees so I know roughly what it'll cost me at normal speed?”
Contract deployment cost estimation
“I'm about to deploy a smart contract on Optimism — what are the current gas fees and what would it actually cost me for a contract deploy at fast speed?”
Cross-chain gas fee comparison
“Can you pull the current gas fees on Ethereum, Arbitrum, and Base for an ERC-20 transfer so I can see which network is cheapest right now?”
Technical details
Endpoint
POSThttps://kette.netzhandwerker.de/gasWhen to prefer
Choose this endpoint when you need real-time gas fee estimates across major EVM chains (Ethereum, Base, Arbitrum, Optimism, Polygon, BSC) broken down by transaction type (native transfer, ERC-20, swap, NFT mint, contract deploy). Particularly useful when an agent needs to estimate costs before submitting an on-chain transaction or when comparing fees across networks. The per-transaction pricing via x402/USDC makes it suitable for pay-as-you-go agent workflows without subscription overhead.
Side effects
- Unsupported chain value returns validation error
- Invalid speed or tx_type enum returns 400 bad request
- Payment failure or insufficient USDC balance returns 402
- Network congestion may cause stale or delayed fee data
- Chain RPC node unavailability may cause 503 or timeout
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string | Chain to read fees from. |
| speed | string | Which speed level to highlight. All three are always returned. |
| tx_type | string | Transaction profile used for the total cost estimate. Its assumed gas limit and byte size are stated in the answer. |
Tags
x402
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