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x402 Multi-Chain EVM RPC Proxy
x402
x402 Multi-Chain EVM RPC Proxy is a paid API for AI agents from x402tap.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-11).
Executes read-only JSON-RPC calls (eth_call, eth_getBalance, eth_getTransactionReceipt, etc.) against major EVM chains via a pay-per-call proxy
Price / call$0.01
Success—
StatusUnknown
How this service works
Safelisted read-only JSON-RPC proxy across major EVM chains (base, ethereum, polygon, arbitrum, optimism) — eth_call, eth_getBalance, eth_getTransactionReceipt, eth_getBlockByNumber, and more
Output
A JSON object containing the chain name, the RPC method called, and the result field with the raw RPC response value (e.g. hex-encoded balance, block number, transaction receipt object, or contract return data).
Example use cases
Verify on-chain transaction status
“Can you check whether transaction 0xabc123...def on Polygon confirmed successfully and how much gas it used?”
Read smart contract state on Base
“Call the balanceOf function on the USDC contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 for my wallet 0x1234...5678 on Base — what's my token balance?”
Monitor latest block on Arbitrum
“Fetch the latest block number on Arbitrum so I can check how far behind my local node is.”
Technical details
Endpoint
GEThttps://x402tap.com/api/rpc?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need lightweight, pay-per-call read-only access to EVM chain state across multiple networks without managing your own RPC provider keys or subscriptions. It is ideal for agents that occasionally query on-chain data across chains like Base, Ethereum, Polygon, Arbitrum, and Optimism without committing to a monthly RPC plan. Prefer alternatives (e.g. a dedicated Alchemy or Infura subscription) for high-volume or write operations.
Side effects
- Unsupported or write-only RPC method returns an error (only safelisted read-only methods allowed)
- Invalid or malformed params JSON array causes a parse error
- Unsupported chain name returns an error (only base, ethereum, polygon, arbitrum, optimism accepted)
- Invalid wallet address or transaction hash causes RPC-level error
- Payment not received causes 402 rejection before the call is executed
- Network timeout from the upstream RPC node
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"chain": "Base",
"method": "eth_blockNumber",
"result": "0x1234567"
}
}Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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