# Transaction Explainer

> Transaction Explainer is a paid API for AI agents from chain.intel.rallylive.ca, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-02).

Explains any blockchain transaction in plain English, including status, parties, decoded method/parameters, USD value, fees, and token movements across multiple EVM chains.

## Facts

- Endpoint: GET https://chain.intel.rallylive.ca/tx/explain?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/transaction-explainer-5ea1af55
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_e-M0ftaCb4ZzGthOk3VgY

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 transaction-explainer-5ea1af55
```

Example prompt: Can you explain what happened in this transaction in plain English — 0x4a3b...f9c2 on Arbitrum? I want to know who sent what to whom, what method was called, the USD value, the fee, and any token transfers.

## When to prefer this

Use this endpoint when you need a human-readable, USD-denominated breakdown of a specific transaction across Base, Ethereum, Arbitrum, Optimism, or Polygon — especially when you need decoded method parameters, labeled addresses, and token movement details in one call. Prefer this over raw RPC calls or block explorers when the consumer is a non-technical user or an agent that needs structured plain-English output without parsing ABI data manually.

## Known failure modes

- Invalid or malformed transaction hash returns an error
- Transaction hash not found on the specified chain
- Unsupported chain prefix returns an error
- Unrecognized or unverified contract ABI may result in partially decoded method data
- Network or RPC timeout may delay or fail the response
- Rate limiting or payment failure (x402) blocks the call

## How this service works

Explain any transaction in plain English: status, from/to (with names), decoded method and parameters, native value and fee in USD, and every token movement. Default chain Base; prefix another: ethereum:, arbitrum:, optimism:, polygon:. $0.02 per call.

## Output

A plain-English explanation of the transaction including: status (success/failed/pending), labeled from and to addresses, decoded smart contract method name and parameters, native token value and fee in USD, and a breakdown of every ERC-20 or other token movement with amounts and USD values.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/transaction-explainer-5ea1af55/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from chain.intel.rallylive.ca](https://www.zero.xyz/host/chain.intel.rallylive.ca/llms.txt)