# x402 Blockchain Forensics API – Transaction Trace

> x402 Blockchain Forensics API – Transaction Trace is a paid API for AI agents from x402-blockchain-forensics.onrender.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

Traces a blockchain transaction by hash across Ethereum, Base, or Arbitrum, returning detailed flow and forensic analysis via pay-per-call USDC micropayment.

## Facts

- Endpoint: GET https://x402-blockchain-forensics.onrender.com/api/tx/trace
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-blockchain-forensics-api-transaction-trace-925df5c3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EZMESx27ZHQS_vSJoPE8L

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability x402-blockchain-forensics-api-transaction-trace-925df5c3
```

Example prompt: Can you trace this transaction for me and show me where the funds moved — hash 0x4f3c2a1b9e7d6f0c8a2b5d3e1f9c7a4b2d6e8f0a1c3b5d7e9f, on the Base chain?

## When to prefer this

Use this endpoint when you need to trace a specific on-chain transaction by hash across Ethereum, Base, or Arbitrum without a subscription — ideal for pay-per-call forensic investigation in agent workflows where cost-efficiency and micropayment compatibility (x402/USDC) matter.

## Known failure modes

- Invalid or malformed transaction hash returns an error
- Transaction hash not found on the specified chain returns 404 or empty result
- Unsupported chain identifier returns validation error
- Payment failure (insufficient USDC or x402 protocol error) returns 402
- Network timeout or RPC node failure returns 503
- Hash exists on a different chain than specified

## How this service works

AI Agent blockchain investigation tools with x402 v2 payment protocol. Wallet profiling, risk scoring, token security auditing, and transaction tracing across Ethereum, Base, and Arbitrum. Like Chainalysis — but pay-per-call with USDC micropayments.

## Output

A forensic trace of the specified transaction including fund flow, internal calls, contract interactions, and a breakdown of what occurred on-chain for the given hash on the requested network.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "hash"
 ],
 "properties": {
  "hash": {
   "type": "string",
   "description": "Transaction hash (0x...)"
  },
  "chain": {
   "enum": [
    "ethereum",
    "base",
    "arbitrum"
   ],
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-blockchain-forensics-api-transaction-trace-925df5c3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-blockchain-forensics.onrender.com](https://www.zero.xyz/host/x402-blockchain-forensics.onrender.com/llms.txt)