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Base Address Nonce Lookup
x402
Base Address Nonce Lookup is a paid API for AI agents from x402-data-api.sigrunner.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-20).
Returns the latest and pending transaction count (nonce) for a given Base mainnet address, useful for determining the next nonce before signing a transaction.
Price / call$0.002
Success—
StatusUnknown
How this service works
Transaction count (nonce) for a Base address, latest and pending. Use when an agent needs the next nonce for a Base address before signing a transaction.
Output
A JSON object containing the Base chain identifier, the queried address, the latest confirmed nonce (number of mined transactions), and the pending nonce (including transactions in the mempool), e.g. {"chain":"base","address":"0x...","nonce_latest":1,"nonce_pending":1}.
Example use cases
Pre-signing nonce check for raw transaction
“Before I sign and broadcast this Base transaction, fetch the latest and pending nonce for 0xAbCd1234... so I can set the right nonce field and avoid a replacement error.”
Wallet sequencing for automated agent
“My agent is about to send several Base transactions in sequence from 0x9F3a... — can you grab the current confirmed and pending nonce so it can number each transaction correctly?”
Stuck transaction diagnosis
“I think I have a stuck pending transaction on Base from address 0x7Ee2... — check the latest confirmed nonce versus the pending nonce to see if there's a gap.”
Technical details
Endpoint
GEThttps://x402-data-api.sigrunner.workers.dev/chain/nonce?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent or transaction-signing workflow needs to determine the correct nonce for a Base mainnet address before constructing or submitting a transaction. It is especially useful for avoiding nonce collisions or identifying stuck transactions by comparing latest vs. pending values. Prefer this over general-purpose Ethereum RPC calls when operating within the x402 micropayment ecosystem on Base.
Side effects
- Missing or malformed address parameter returns an error
- Non-0x-prefixed or invalid address length causes a validation failure
- Address not found on Base mainnet may return nonce of 0
- Network or RPC issues may cause temporary unavailability
- Payment failure (x402) blocks access if USDC funds are insufficient
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"chain": "base",
"address": "0x4200000000000000000000000000000000000006",
"nonce_latest": 1,
"nonce_pending": 1
}
}Tags
x402
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