# NexusAPI Crypto Transaction Trace

> NexusAPI Crypto Transaction Trace is a paid API for AI agents from nexus-api-virid.vercel.app, paid per call via x402, $0.088035/call, status unknown (last checked 2026-09-16).

Traces and analyzes a blockchain transaction by hash or query, returning detailed execution and call trace data

## Facts

- Endpoint: POST https://nexus-api-virid.vercel.app/api/crypto/transaction/trace
- Price: $0.088035/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nexusapi-crypto-transaction-trace-9a53ea28
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Fy54yPHggsnEvmcZaTNZ0

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 nexusapi-crypto-transaction-trace-9a53ea28 -d '<json body>'
```

Example prompt: Can you trace transaction 0x4e3a8f... on the blockchain and show me all the internal calls and contract interactions that happened?

## When to prefer this

Use this endpoint when you need to inspect the internal execution details of a specific blockchain transaction — especially for debugging failed smart contract calls, auditing DeFi interactions, or forensic investigation of on-chain activity. Prefer this over simple transaction lookup endpoints when you need more than basic metadata (sender, receiver, value) and require the full execution trace including internal calls.

## Known failure modes

- Invalid or malformed transaction hash returns an error or empty result
- Transaction not found on the target chain returns a not-found error
- Network congestion or RPC timeout causes slow or failed response
- Query string too vague yields incomplete or irrelevant trace data
- Payment failure in USDC on Base prevents the call from completing

## How this service works

Crypto, AI, Social Media, Finance, Weather, Tools &amp; more. Pay per call in USDC on Base. No API keys.

## Output

A structured breakdown of the transaction's execution trace, including internal calls, contract interactions, value transfers, method signatures called, gas usage per step, and any reverts or errors encountered during execution.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "query": {
   "type": "string",
   "description": "Search query or input parameter"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "description": "API response data"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nexusapi-crypto-transaction-trace-9a53ea28/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from nexus-api-virid.vercel.app](https://www.zero.xyz/host/nexus-api-virid.vercel.app/llms.txt)