ChainRead Nonce Lookup

x402

ChainRead Nonce Lookup is a paid API for AI agents from api.firstmention.uk, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-29).

Retrieves the nonce (transaction count) for a blockchain address on Base or Ethereum, useful for transaction sequencing and wallet analysis.

Price / call$0.01

Seller volume →—

Success—

StatusUnknown

How this service works

Pay-per-call HTTP APIs, paid with x402 in USDC on Base (eip155:8453): agentkit, api-change-check, basedue, basewatch, chainread, check-sanctions, chgwatch, company-facts, composite, edgar, feednews, pageaudit, solcheck, token-dd, txpreflight, walletcheck, webmd, webread, websearch, x402index. Each operation describes its service.

Output

Returns a JSON object containing the blockchain address, chain, nonce-derived risk score (0-100), a verdict (e.g. CAUTION, SAFE, RISKY), an array of flags with severity levels (e.g. owner_holds_power: high), and metadata including the payer address and price paid in USD.

Example use cases

Pre-transaction nonce check

“Before I send a transaction from 0x1234abcd...5678 on Base, can you grab the current nonce for that address so I know what sequence number to use?”

Wallet activity risk assessment

“Can you check the nonce and risk profile for 0xABC123...DEF456 on Ethereum — I want to know how active this wallet is and if there are any red flags before I interact with it?”

Smart contract nonce audit

“Pull the on-chain nonce for the contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base and tell me the verdict and any risk flags you see.”

Technical details

Endpoint

POSThttps://api.firstmention.uk/s/chainread/nonce?utm_source=zero.xyz

When to prefer

Use this endpoint when you need on-chain nonce data for an address on Base or Ethereum, especially when combined with risk scoring and flagging. Prefer it over raw RPC calls when you want structured risk metadata alongside the nonce, or when building agents that need pay-per-call blockchain reads without managing infrastructure. Best for AI agents that need transaction sequencing data plus compliance-grade risk context in a single call.

Side effects

Invalid or malformed 0x address returns an error
Unsupported chain value (not 'base' or 'ethereum') returns a validation error
Payment failure via x402/USDC results in 402 Payment Required
Network or RPC node unavailability causes timeout or 503
Address with no on-chain history may return minimal data or zero nonce

Input

Schema · Request body

Field	Type	Description
hash	string	0x transaction hash (for /tx)
chain	string
number	string	Block number or 'latest' (for /block)
address	string	0x address or ERC-20 contract address
addresses	array	Up to 25 addresses (for /batch)

Output

Schema · Response

{
  "type": "json",
  "example": {
    "risk": "medium",
    "_meta": {
      "payer": "0x...",
      "price_usd": 0.01
    },
    "chain": "base",
    "flags": [
      {
        "code": "owner_holds_power",
        "severity": "high"
      }
    ],
    "score": 45,
    "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "verdict": "CAUTION"
  }
}

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