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EVM Transaction Count (Nonce) Lookup
x402
EVM Transaction Count (Nonce) Lookup is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-01).
Returns the transaction count (nonce) for a given Ethereum-compatible address on a specified EVM chain, optionally at a specific block.
Price / call$0.002
Success—
StatusUnknown
How this service works
Transaction count (nonce) for one address — Genesis402 / UnyKorn Operator Network
Output
Returns a JSON object with ok status, the nonce/transaction count value, a payment receipt including tx_hash, amount_usd, and receipt_id, and a generated_at ISO8601 timestamp.
Example use cases
Pre-flight nonce check before sending transaction
“Before I broadcast this transaction, can you check the current nonce for 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Ethereum so I know what nonce to use?”
Historical nonce at specific block
“How many transactions had 0xAbCdEf1234567890AbCdEf1234567890AbCdEf12 sent on Base as of block 12000000?”
Nonce check for wallet activity audit
“Can you tell me the total transaction count for 0x1234567890abcdef1234567890abcdef12345678 on Polygon — I want to verify how active this address has been?”
Technical details
Endpoint
POSThttps://twin.unykorn.org/evm-nonce?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need the transaction count or nonce for a specific EVM address on one of ten supported chains (Ethereum, Base, Polygon, Arbitrum, Optimism, BSC, Avalanche, Gnosis, Linea, Scroll), especially when you need optional historical block-level precision. It is a pay-per-call API suitable for agents that need sporadic on-demand nonce lookups without maintaining a full node or RPC subscription.
Side effects
- Invalid address format (not a valid 0x + 40 hex chars) returns an error
- Unsupported chain value returns a validation error
- Invalid or future block identifier returns an error
- Network timeout or RPC node unavailability may cause failure
- Insufficient payment (x402) causes request rejection
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| params | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"type": "evm-nonce",
"receipt": {
"tx_hash": "0x<64hex>",
"amount_usd": 0.25,
"receipt_id": "g402-<16hex>"
},
"generated_at": "<iso8601>"
}
}Tags
x402
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