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Ethereum JSON-RPC via x402 Micropayment
x402
Ethereum JSON-RPC via x402 Micropayment 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).
Proxies Ethereum JSON-RPC calls (eth_blockNumber, eth_getBalance, eth_call, etc.) paid per-call with USDC on Base via x402 — 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, chain name ('ethereum'), chain_id (1), the RPC result (e.g. hex block number or balance), upstream RPC URL used, and latency in milliseconds.
Example use cases
Check ETH balance before sending
“Before I send ETH, check the current balance of 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Ethereum mainnet using the x402 pay-per-call RPC — I don't have an Infura key handy.”
Read smart contract state on-chain
“Call the Ethereum RPC with eth_call to read the totalSupply of the USDC contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on mainnet — use eth_call with the right params and pay per call.”
Get latest Ethereum block number
“What's the latest Ethereum block number right now? Use the pay-per-call JSON-RPC proxy with eth_blockNumber — no API key, just USDC micropayment.”
Technical details
Endpoint
GEThttps://kr-x402-mvp.kgy5612.workers.dev/v1/eth?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your AI agent needs Ethereum mainnet JSON-RPC access without pre-provisioning an API key, especially in automated or agent-to-agent workflows where USDC micropayments via x402 are already in the stack. Ideal for one-off or low-volume on-chain reads (balances, block height, contract calls) where per-call billing is more economical than a monthly RPC subscription.
Side effects
- Payment not received or insufficient USDC — returns 402 Payment Required
- Invalid JSON-RPC method name — upstream returns error object with code and message
- Malformed params array (not valid URL-encoded JSON) — parse error from upstream
- Upstream PublicNode unavailable — proxy may return 502 or timeout
- Calling a write method (eth_sendRawTransaction) may be blocked or unsupported by this proxy
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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