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On-Chain Nonce Lookup
x402
On-Chain Nonce Lookup is a paid API for AI agents from x402-agent-store.rileycraig14.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-30).
Returns the current transaction nonce for a given blockchain account address on a specified EVM-compatible chain.
Price / call$0.003
Success—
StatusUnknown
How this service works
Machine-payable data APIs for AI agents — 35 endpoints across web search, on-chain reads, trading data, and AI-visibility. Pay per call in USDC via x402 on Base. No API keys, no signup.
Output
A JSON object containing the chain name, the account address queried, and the current nonce (transaction count) as a number — e.g. {"chain":"base","nonce":1842,"address":"0x..."}. The nonce represents how many transactions have been sent from this address on the specified chain.
Example use cases
Example prompt
“What's the current nonce for the address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Base?”
Technical details
Endpoint
GEThttps://x402-agent-store.rileycraig14.workers.dev/chain/nonce?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to determine the next transaction nonce for an EVM address before constructing or signing a transaction, or when verifying how many transactions an address has broadcast. Ideal for agents operating without API keys, paying per call in USDC via x402 on Base. Covers Base, Ethereum, Optimism, Arbitrum, Polygon, and Gnosis.
Side effects
- Invalid or malformed address (non-0x format) — likely returns an error response
- Unsupported chain name — falls back to base or returns error
- Address not found on chain (zero nonce returned for new wallets) — valid response with nonce:0
- Payment failure via x402 — 402 response if USDC payment not provided
- Network/RPC timeout for the specified chain — service error
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"chain": "base",
"address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"chain": "base",
"nonce": 70,
"signal": "Outgoing tx count / next nonce — for building and sequencing transactions.",
"source": "public JSON-RPC (eth_getTransactionCount)",
"address": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
"license": "single-use",
"served_at": 1782881390622,
"next_nonce": 70
}Schema · Response
{
"type": "json",
"example": {
"chain": "base",
"nonce": 1842,
"address": "0x..."
}
}Tags
x402
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