# ISHOB Explain Transaction

> ISHOB Explain Transaction is a paid API for AI agents from api.ishob.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-15).

Decodes a blockchain transaction into plain-English: type (swap, transfer, NFT, etc.), net token changes with USD values, token movements, approvals, decoded function call, and fee — across 6 EVM chains.

## Facts

- Endpoint: GET https://api.ishob.com/v1/crypto/explain-tx?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ishob-explain-transaction-4b152cc1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MFz6jJ-NW4mt-Zq6z5X2R

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 ishob-explain-transaction-4b152cc1
```

Example prompt: Can you explain what happened in this Ethereum transaction — 0x4a7d3f2e1b8c9a0d6e5f2c4b3a1d8e7f9c0b2a3d4e5f6a7b8c9d0e1f2a3b4c5d — break down what tokens moved, the net changes in USD, and what function was called?

## When to prefer this

Use this endpoint when you need a detailed, rule-based (deterministic, no AI hallucination) breakdown of a specific on-chain transaction across Ethereum, Base, Arbitrum, Optimism, Polygon, or BNB Chain. Ideal when you need USD-valued net token changes, decoded function arguments, or failure/revert reasons for a single tx hash. Prefer this over block-explorer scraping when you need structured data programmatically, and over AI-based decoders when deterministic accuracy is required.

## Known failure modes

- Invalid or malformed transaction hash (not 0x + 64 hex) returns validation error
- Transaction hash not found on the specified chain returns 404 or not-found error
- Unsupported chain enum value returns schema validation error
- Unverified contract ABI falls back to signature-database lookup which may return generic function names
- Very new transactions not yet indexed may return not-found temporarily
- Payment failure via x402 protocol results in 402 response before data is returned

## How this service works

Explain any mined transaction in plain English: what happened (swap, transfer, approval, NFT buy/sell/mint, wrap, contract deploy, failed + revert reason), the sender's net token changes with USD values, every token and native-coin movement, approvals granted, the function called (named from the verified ABI or a signature database, with decoded arguments) and the fee. Rule-based, no AI. Ethereum, Base, Arbitrum, Optimism, Polygon, BNB Chain.

## Output

A structured plain-English breakdown of the transaction including: classified transaction type (swap, transfer, NFT buy/sell/mint, wrap, approval, contract deploy, or failure), the sender's net token changes with USD valuations, a list of every token and native-coin movement, any approvals granted with spender and amount, the named function called (from ABI or signature DB) with decoded arguments, and the gas fee paid — all derived rule-based without AI inference.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "chain",
      "hash"
     ],
     "properties": {
      "hash": {
       "type": "string",
       "pattern": "^0x[0-9a-fA-F]{64}$",
       "description": "Transaction hash (0x + 64 hex)"
      },
      "chain": {
       "enum": [
        "ethereum",
        "base",
        "arbitrum",
        "optimism",
        "polygon",
        "bsc"
       ],
       "type": "string"
      }
     }
    }
   },
   "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/ishob-explain-transaction-4b152cc1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.ishob.com](https://www.zero.xyz/host/api.ishob.com/llms.txt)