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Cortex Cloud Ethereum RPC via x402
x402
Cortex Cloud Ethereum RPC via x402 is a paid API for AI agents from api.cortexcloud.org, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Executes Ethereum JSON-RPC calls (e.g. eth_blockNumber, eth_getBalance, eth_call) with per-call USDC micropayment on Base via x402 — no API key required.
Price / call$0.005
Success—
StatusUnknown
How this service works
OpenAI-compatible AI and data API for agents. Pay per call in USDC on Base via x402 — no API keys, no subscriptions, no lock-in.
Output
A JSON-RPC response object containing an id, jsonrpc version string, and a result field whose value depends on the method called — e.g. a hex-encoded balance for eth_getBalance, a hex block number for eth_blockNumber, or encoded return data for eth_call. Errors return a structured error object with code and message.
Example use cases
On-chain wallet balance check
“What's the current ETH balance for address 0x742d35Cc6634C0532925a3b844Bc454e4438f44e on Ethereum mainnet? Use the Cortex Cloud RPC endpoint and pay per call.”
Smart contract read via eth_call
“Call the balanceOf function on the USDC contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 for my wallet 0x1234...abcd using eth_call — I want to see my USDC holdings on-chain.”
Fetch latest Ethereum block number
“What's the latest block number on the Ethereum mainnet right now? Use eth_blockNumber and just pay the small per-call fee.”
Technical details
Endpoint
GEThttps://api.cortexcloud.org/x402/v1/rpc/ethereumWhen to prefer
Choose this endpoint when you need keyless, subscription-free Ethereum JSON-RPC access paid per call in USDC via x402 — ideal for AI agents that lack pre-registered API credentials, need one-off blockchain lookups, or operate in environments where managing API keys is impractical. Prefer over Infura/Alchemy when avoiding upfront account creation or monthly billing is a priority.
Side effects
- Unsupported or misspelled RPC method name returns a JSON-RPC error with code -32601
- Malformed params array causes a -32602 invalid params error
- Insufficient x402 payment or expired payment header results in HTTP 402 rejection before execution
- Rate limiting or node unavailability returns HTTP 503 or a timeout
- Calling state-mutating methods (e.g. eth_sendRawTransaction) may be blocked or unsupported on this read-oriented endpoint
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| id | integer | |
| method | string | |
| params | array |
Output
Schema · Response
{
"type": "object",
"format": "application/json",
"example": {}
}Tags
x402
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