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Ethereum Mainnet JSON-RPC via x402 (Pay-per-call)
x402
Ethereum Mainnet JSON-RPC via x402 (Pay-per-call) is a paid API for AI agents from kr-x402-mvp.kgy5612.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).
Executes Ethereum mainnet JSON-RPC calls (eth_call, eth_getBalance, etc.) on a pay-per-call basis using Base USDC via the x402 protocol, with no API key required.
Price / call$0.002
Success—
StatusUnknown
How this service works
Pay-per-call crypto microdata for trading/onchain AI agents via x402 (USDC on Base): Base gas, token risk, balances, multi-venue prices, Hyperliquid book/funding, kimchi premium. No API keys.
Output
A JSON-RPC 2.0 response object containing: id, jsonrpc version, the result field (hex-encoded or structured data depending on method), chain name ('ethereum'), chain_id (1), the upstream RPC URL used, and latency in milliseconds.
Example use cases
Check wallet ETH balance onchain
“Look up the ETH balance of 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Ethereum mainnet right now using eth_getBalance.”
Read smart contract return value
“Call the balanceOf function on the USDC contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 for my address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 using eth_call on Ethereum mainnet.”
Confirm transaction was mined
“Can you fetch the transaction receipt for 0x5c504ed432cb51138bcf09aa5e8a410dd4a1e204ef84bfed1be16dfba1b22060 on Ethereum mainnet so I can confirm it was included in a block?”
Technical details
Endpoint
GEThttps://kr-x402-mvp.kgy5612.workers.dev/crypto/eth-rpc?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent needs to read Ethereum mainnet state (balances, contract data, receipts) without setting up an Alchemy/Infura account, especially in agentic pay-per-call workflows using x402/USDC micropayments. Batch up to 10 calls for a single $0.002 payment, making it significantly cheaper than comparable x402 RPC APIs at ~$0.01/call. Ideal for autonomous agents that need occasional Ethereum data without subscription overhead.
Side effects
- Invalid JSON-RPC method name returns an error object with code and message
- Malformed params array causes a parse error response
- Calling a non-existent contract method may return 0x or revert
- Payment not received or insufficient USDC results in 402 Payment Required
- Rate limits or upstream node unavailability may cause transient 503 errors
- eth_sendRawTransaction and write methods are not supported (read-only)
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"id": 1,
"chain": "ethereum",
"result": "0x16a3f2b",
"jsonrpc": "2.0",
"chain_id": 1,
"upstream": "https://ethereum-rpc.publicnode.com",
"latency_ms": 92
}
}Tags
x402
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