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Kairo Agent x402 API — Onchain Address Lookup
x402
Kairo Agent x402 API — Onchain Address Lookup is a paid API for AI agents from kairo-x402.onrender.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
Looks up ETH and USDC balances, transaction count, contract status, and activity status for any EVM address on-chain, paid per-call via x402.
Price / call$0.02
Success—
StatusUnknown
How this service works
Crypto-native ($0.02 USDC on Base, x402) utility endpoints for agents. No accounts, no KYC — pay-per-call.
Output
Returns a JSON object with the queried address, the network name, current ETH balance, current USDC balance, total transaction count, a boolean indicating if the address is a smart contract, a boolean for whether it is active, and a boolean for whether it is funded.
Example use cases
Verify counterparty wallet before payment
“Before I send funds, can you check if 0xAbCd1234567890abcdef1234567890AbCd123456 is a real active wallet with some transaction history, or if it's brand new and unfunded?”
Detect smart contract vs user wallet
“Tell me whether 0xdAC17F958D2ee523a2206206994597C13D831ec7 is a smart contract or a regular EOA address, and show me its ETH and USDC balances.”
Monitor agent wallet funding status
“Check if my agent's wallet at 0x1111111111111111111111111111111111111111 has enough funds — show me the ETH balance, USDC balance, and whether it's marked as active.”
Technical details
Endpoint
GEThttps://kairo-x402.onrender.com/api/onchainWhen to prefer
Choose this endpoint when you need quick, no-account-required onchain data for any EVM address — especially ETH/USDC balances and activity status — and you want to pay micro-amounts per call via x402 without API keys or KYC. Ideal for agent workflows on Base that need to verify wallet state before executing transactions.
Side effects
- Invalid or malformed 0x address returns an error
- Address not found on network may return zero balances with is_active=false
- Payment failure via x402 protocol will block the response
- Network congestion or RPC downtime may cause slow or failed responses
- Non-EVM address formats (e.g. Solana pubkeys) will be rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| addressrequired | string | 0x EVM address |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| addressrequired | string | |
| networkrequired | string | |
| tx_countrequired | integer | |
| is_activerequired | boolean | |
| is_funded | boolean | |
| eth_balancerequired | number | |
| is_contractrequired | boolean | |
| usdc_balancerequired | number |
Tags
x402
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