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ChainRead Transaction Lookup
x402
ChainRead Transaction 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).
Fetches and risk-scores a blockchain transaction by hash on Base or Ethereum, returning flags, a risk score, and a verdict.
Price / call$0.01
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 with a numeric risk score (0-100), a verdict string (e.g. CAUTION, SAFE, HIGH_RISK), an array of flag objects each containing a code and severity level, the chain name, the queried address or hash, and metadata including the payer wallet and price paid in USD.
Example use cases
Pre-transfer risk check on Base
“Before I send funds, can you check transaction 0xabc123...def456 on Base and tell me if there are any high-severity risk flags or if the verdict is safe to proceed?”
Compliance audit of Ethereum transaction
“I need to audit this Ethereum transaction hash 0x9f8e...1234 — can you pull the risk score, verdict, and any flags like sanctions exposure or suspicious ownership?”
Investigate suspicious DeFi activity
“Someone sent me a payment from 0x1234...abcd on Base — can you fetch the transaction hash 0xdeadbeef...7890 and check whether there's any medium or high risk I should know about?”
Technical details
Endpoint
POSThttps://api.firstmention.uk/s/chainread/tx?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, pay-per-call risk score and flag breakdown for a specific transaction hash on Base or Ethereum without setting up your own blockchain node or analytics pipeline. It's ideal for agent workflows that need to gate actions on transaction risk before proceeding, or for compliance checks on individual transactions at minimal cost ($0.01 USDC).
Side effects
- Invalid or malformed transaction hash returns an error
- Unsupported chain value (not 'base' or 'ethereum') causes validation failure
- Transaction hash not found on the specified chain returns not-found error
- Insufficient USDC balance or x402 payment failure blocks the call
- Rate limiting or network timeouts on the RPC provider side
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"
}
}Tags
x402
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