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402rpc Ethereum JSON-RPC
x402
402rpc Ethereum JSON-RPC is a paid API for AI agents from 402rpc.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-16).
Executes Ethereum mainnet JSON-RPC calls (eth_, net_, web3_ methods) via a pay-per-call independently operated full node, with no API key required.
Price / call$0.001
Success—
StatusUnknown
How this service works
Ethereum mainnet JSON-RPC from an independently operated full node. One call per payment, no account or API key. Serves eth_, net_ and web3_ methods. Blocks, transactions, receipts and logs from the Merge (block 15537394) onward. Current state only, not an archive node: historical state calls are refused, not charged. eth_getLogs capped at 10000 blocks. Raw transactions go out via public relays. Price scales with method cost.
Output
Returns a standard JSON-RPC 2.0 response object containing either a 'result' field with the requested data (block, balance, receipt, logs, call output, etc.) or an 'error' object with code and message. Historical state before the Merge (block 15537394) is not available; eth_getLogs is capped at a 10,000-block range.
Example use cases
Check wallet ETH balance on-chain
“Can you look up the current ETH balance for the address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 directly on Ethereum mainnet?”
Fetch recent contract event logs
“Get me the event logs for the USDC contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 from block 20000000 to 20010000 on Ethereum mainnet.”
Broadcast signed raw transaction
“I have a signed raw transaction ready — can you submit it to the Ethereum network? Here it is: 0x02f8...”
Technical details
Endpoint
POSThttps://402rpc.com/rpc?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need permissionless, no-account Ethereum mainnet JSON-RPC access and are comfortable with micropayment-per-call billing via x402/USDC. Ideal for agents that make infrequent or unpredictable Ethereum queries without wanting to manage API keys or subscriptions. Not suitable for archive/historical state queries or methods outside eth_, net_, and web3_ namespaces.
Side effects
- Historical state queries (pre-Merge block state) are refused without charge
- eth_getLogs range exceeding 10,000 blocks returns an error
- Unsupported method prefixes (e.g. debug_, trace_) result in method-not-found errors
- Malformed JSON-RPC request returns parse or invalid-request error
- Insufficient USDC payment results in 402 Payment Required before processing
- Network congestion may delay raw transaction relay via public relays
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| id | — | |
| method | string | JSON-RPC method. eth_, net_ and web3_ only. |
| params | array | Positional parameters for the method. |
| jsonrpc | string |
Tags
x402
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