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HALOWERK kettenwerk – EVM Transaction Simulator
x402
HALOWERK kettenwerk – EVM Transaction Simulator is a paid API for AI agents from kette.netzhandwerker.de, paid per call via x402, $0.012/call, status unknown (last checked 2026-09-15).
Simulates an EVM transaction on a specified chain and block without broadcasting it, returning execution results and state changes.
Price / call$0.012
Success—
StatusUnknown
How this service works
HALOWERK kettenwerk — bezahlte Endpunkte nach x402. Preise in USDC auf Base Mainnet.
Output
Returns the outcome of the simulated EVM transaction including success/failure status, gas consumed, return data, revert reason (if applicable), and any state changes — without broadcasting anything to the network.
Example use cases
Pre-flight DeFi swap check
“Before I execute this swap on Arbitrum, simulate it for me: from 0xDead...Beef to 0x1234...5678, calldata 0xa9059cbb..., value 0, latest block — will it succeed and how much gas will it use?”
Debug a reverting contract call
“My transaction keeps reverting on Base. Can you simulate it with sender 0xAABB...CCDD, target 0x4200...0006, calldata 0x095ea7b3..., value 0, and tell me the revert reason?”
Historical block state replay
“Replay this Polygon transaction as it would have executed at block 45000000: from 0x1111...2222, to 0x3333...4444, calldata 0x12345678, value 1000000000000000 wei — show me what state changes it made.”
Technical details
Endpoint
POSThttps://kette.netzhandwerker.de/tx/simulateWhen to prefer
Choose this endpoint when you need to simulate a raw EVM transaction across Ethereum, Base, Arbitrum, Optimism, Polygon, or BSC with optional state overrides — particularly useful for pre-flight validation, debugging reverts, or replaying historical transactions. Prefer this over general RPC providers when you want a simple HTTP POST API with per-call micropayment billing (x402/USDC) rather than managing your own node or RPC credentials.
Side effects
- Invalid Ethereum address format for 'from' or 'to' → validation error
- Unsupported chain value → enum validation failure
- Gas limit below 21000 or above 30000000 → rejected
- Malformed calldata (not valid hex) → parse error
- Block number not found on the target chain → simulation error
- Node unavailable for the requested chain → 503 or timeout
- Insufficient payment (x402 payment missing or wrong amount) → 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | Target address. |
| gas | integer | Optional gas limit for the simulation. |
| data | string | Call data. |
| from | string | Sender address. No signature is needed and none is created. |
| block | string | "latest" or a block number as decimal string. |
| chain | string | Chain to simulate on. |
| value | string | Value in wei, decimal or 0x. |
| state_overrides | object | Optional state overrides per address, in the eth_simulateV1 format (balance, nonce, code, state, stateDiff). |
Tags
x402
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