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agent402.tools Ethereum JSON-RPC Passthrough
x402
agent402.tools Ethereum JSON-RPC Passthrough is a paid API for AI agents from agent402.tools, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Forwards arbitrary read-only JSON-RPC method calls to EVM-compatible blockchain networks via a whitelisted set of safe, non-mutating methods
Price / call$0.002
Success—
StatusUnknown
How this service works
Escape hatch for power users: forward an arbitrary read-only JSON-RPC method to the chain. Method must be in our read-only whitelist (eth_call, eth_getLogs, eth_getBlockByNumber, eth_getTransactionReceipt, eth_chainId, eth_blockNumber, etc.). Mutating methods (eth_sendTransaction, eth_sendRawTransaction) are rejected - sign and broadcast through your own provider.
Output
Returns the JSON-RPC response object for the requested read-only method, including the result field (e.g. hex-encoded return value for eth_call, block object for eth_getBlockByNumber, array of log objects for eth_getLogs, or a hex block number for eth_blockNumber)
Example use cases
Example prompt
“Can you call eth_call on Base with params [{'to':'0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913','data':'0x18160ddd'},[]] so I can read the total supply of that contract?”
Technical details
Endpoint
POSThttps://agent402.tools/api/eth-callWhen to prefer
Use this endpoint when you need to make arbitrary read-only JSON-RPC calls to EVM chains (Ethereum, Base, Polygon, Arbitrum, Optimism) without managing your own RPC node or API key. Ideal for power-user scenarios where pre-built endpoints don't cover the exact method needed. Prefer this over managed single-purpose endpoints when you need low-level access to eth_call, eth_getLogs, eth_getBlockByNumber, eth_getTransactionReceipt, or eth_blockNumber directly.
Side effects
- Method not in read-only whitelist — endpoint rejects mutating or unsupported methods
- Invalid params array for the chosen method — JSON-RPC error returned
- Unsupported network name — defaults to Base or returns an error
- Malformed JSON body — 400 bad request
- Network congestion or node unavailability — upstream RPC timeout or 503
- Payment not completed via x402 protocol — 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| method | string | JSON-RPC method (must be in the read-only whitelist). |
| params | array | JSON-RPC parameter array (often empty for simple methods). |
| network | string | ethereum / base / polygon / arbitrum / optimism (default base). |
Output
Schema · Response
{
"type": "json",
"example": {
"method": "eth_blockNumber",
"result": "0x1234567",
"network": "base"
}
}Tags
x402
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