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DopamineDesk EVM Call – Read-Only Smart Contract Caller
x402
DopamineDesk EVM Call – Read-Only Smart Contract Caller is a paid API for AI agents from ai-data-marketplace-1042299154756.us-central1.run.app, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).
Executes a read-only EVM call (eth_call) against a smart contract on Base, Ethereum, or Arbitrum and returns the raw return data without broadcasting a transaction.
Price / call$0.002
Success—
StatusUnknown
How this service works
Execute one bounded eth_call against Base, Ethereum, or Arbitrum and return raw deterministic call data without signing or broadcasting.
Output
A JSON object containing: 'network' (chain name), 'success' (boolean), 'broadcast' (always false for read calls), 'return_data' (0x-prefixed hex string of the ABI-encoded return value), and 'return_data_bytes' (integer byte length of the return data). The agent must ABI-decode return_data according to the function's output types to extract human-readable values.
Example use cases
Check ERC-20 token balance on-chain
“Call the WETH contract on Ethereum at 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 with the balanceOf calldata for address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 and tell me what the raw return value is.”
Read DeFi protocol state on Arbitrum
“Query the Uniswap V3 pool contract on Arbitrum at 0xC6962004f452bE9203591991D15f6b388e09E8D0 using the slot0 function calldata so I can see the current price and tick — use the latest block.”
Simulate call at historical block
“Execute an eth_call against the Compound cDAI contract on Ethereum at block 17000000 with the exchangeRateCurrent calldata and return the raw hex data so I can reconstruct the historical exchange rate.”
Technical details
Endpoint
GEThttps://ai-data-marketplace-1042299154756.us-central1.run.app/api/v1/evm_callWhen to prefer
Choose this endpoint when you need to read on-chain smart contract state from Base, Ethereum, or Arbitrum without setting up your own RPC node or Web3 library — particularly useful in agent workflows where you need contract data mid-task and want pay-per-use USDC billing via x402 rather than managing API keys or subscriptions. Prefer it for simple view/pure function calls; it does not broadcast transactions.
Side effects
- Invalid contract address returns success:false with empty return_data
- Malformed or oversized calldata (>32,768 bytes) causes a 400 error
- Unsupported chain name (anything other than base, ethereum, arbitrum) returns an error
- Contract reverts the call — return_data may contain a revert reason in ABI-encoded form
- Invalid block tag or non-existent block height causes lookup failure
- Payment failure via x402 results in 402 response before the call is executed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"network": "base",
"success": true,
"broadcast": false,
"return_data": "0x...",
"return_data_bytes": 32
}
}Tags
x402
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