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Cortex Cloud ETH Balance Lookup
x402
Cortex Cloud ETH Balance Lookup is a paid API for AI agents from api.cortexcloud.org, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Retrieves the ETH balance of a given Ethereum wallet address on the Ethereum network
Price / call$0.001
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
Returns a JSON object containing the queried wallet address, its current ETH balance as a decimal string, and the network name (e.g. 'ethereum'). Example: {"address":"0x...","balance":"1.234","network":"ethereum"}.
Example use cases
DeFi portfolio balance check
“Check the ETH balance on Ethereum for wallet 0x742d35Cc6634C0532925a3b8D4C9B7e1aFb2e123 — I want to know how much ETH it currently holds.”
Pre-transaction liquidity verification
“Before I send a transaction, can you check whether 0xDead...Beef has at least 0.5 ETH available on Ethereum mainnet?”
Automated treasury monitoring
“Pull the ETH balance for our treasury wallet 0x1234...abcd on Ethereum so I can see if we need to top it up.”
Technical details
Endpoint
GEThttps://api.cortexcloud.org/x402/v1/data/eth/balanceWhen to prefer
Use this endpoint when an AI agent needs to retrieve an Ethereum wallet's ETH balance on-demand without managing API keys or subscriptions. Ideal for pay-per-call agent workflows using x402/USDC micropayments on Base. Prefer this over RPC node providers when you want zero-setup, per-call billing with no long-term credential management.
Side effects
- Invalid or malformed Ethereum address returns an error response
- Address not found on Ethereum mainnet returns zero balance or error
- Network congestion may cause delayed or stale balance data
- Payment failure via x402/USDC results in 402 Payment Required without returning data
- Rate limiting or service downtime returns 5xx errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| required | string | |
| properties | string |
Output
Schema · Response
{
"type": "object",
"format": "application/json",
"example": {
"address": "0x...",
"balance": "1.234",
"network": "ethereum"
}
}Tags
x402
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