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EVM Contract Call Simulator (eth_call with Revert Decoding)
x402
EVM Contract Call Simulator (eth_call with Revert Decoding) is a paid API for AI agents from agent.connskill.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-13).
Executes a read-only EVM smart contract call (eth_call) on supported chains, returning the decoded result, revert reason, and optional gas estimate — without broadcasting a transaction.
Price / call$0.02
Success—
StatusUnknown
How this service works
Read-only EVM contract call (eth_call) with decoded revert reason and optional gas estimate — simulate before you sign
Output
Returns a JSON object with: `result` (hex-encoded return data from the call), `status` (success or failure string), and `reverted` (boolean indicating whether the call reverted). When a `from` address is provided, a gas estimate is also included. If the call reverts, the decoded revert reason is surfaced in the response.
Example use cases
Check token balance via contract call
“Simulate a balanceOf call on the USDC contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum for address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 using calldata 0x70a08231000000000000000000000000d8da6bf26964af9d7eed9e03e53415d37aa96045 — tell me the raw result.”
Debug a reverting contract call
“I'm getting a revert when calling my contract at 0x1234567890abcdef1234567890abcdef12345678 on Base with calldata 0xabcdef01 — can you simulate it at the latest block and tell me why it's reverting?”
Gas estimate before DeFi transaction
“Before I sign anything, can you simulate calling 0xDefiContractAddress on Arbitrum with calldata 0x38ed1739 from my wallet 0xMySenderAddress and give me the gas estimate so I know what to expect?”
Technical details
Endpoint
POSThttps://agent.connskill.com/chain/v1/chain-callWhen to prefer
Choose this endpoint when you need to read on-chain EVM contract state or simulate a transaction before signing, especially when you want decoded revert reasons rather than raw hex errors. It supports 5 major EVM chains (Base, Ethereum, Arbitrum, Optimism, Polygon) and includes optional gas estimation in a single call. Prefer it over raw RPC calls when you need human-readable revert decoding and a clean JSON response without managing your own RPC provider.
Side effects
- Invalid or non-existent contract address returns reverted: true with an error message
- Malformed ABI-encoded calldata causes a revert or empty result
- Unsupported chain name returns a validation error
- Block tag referencing a pruned or unavailable block may return an error
- Network timeout or RPC provider unavailability returns a 5xx error
- Missing required fields (chain or to) return a 400-level validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| torequired | string | Contract address to call (0x…) |
| data | string | ABI-encoded calldata (0x…), e.g. 0x70a08231… for balanceOf |
| from | string | Caller address — when set, a gas estimate is included |
| block | string | latest (default), safe, finalized, earliest, or hex block number |
| chainrequired | string | One of: base, ethereum, arbitrum, optimism, polygon |
| value | string | Value in wei (hex or decimal string) |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| result | string | |
| status | string | |
| reverted | boolean |
Tags
x402
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