# Base Transaction Explainer

> Base Transaction Explainer is a paid API for AI agents from 402.com.tr, paid per call via x402, $0.04/call, status unknown (last checked 2026-09-14).

Takes a Base blockchain transaction hash and returns a plain-English explanation of what the transaction did, including action summary, risk assessment, and contextual notes.

## Facts

- Endpoint: GET https://402.com.tr/api/x402/ai-tx-explain
- Price: $0.04/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/base-transaction-explainer-ae5b6a68
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MeVZvhM_24zYXtQbZHIuQ

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 base-transaction-explainer-ae5b6a68
```

Example prompt: Can you explain what this Base transaction actually did in plain English — what action was taken, whether it looks risky, and any notes I should know about? The hash is 0x4a3b2c1d5e6f7890abcdef1234567890abcdef1234567890abcdef1234567890ab

## When to prefer this

Use this endpoint when you need a human-readable interpretation of a specific Base transaction — especially when raw calldata or event logs are opaque and you need risk context (failed tx, risky approvals, high-value transfers) alongside the action summary. Prefer this over generic block explorers when an AI-generated natural language explanation with risk annotation is needed.

## Known failure modes

- Invalid or malformed transaction hash returns an error
- Transaction hash not found on Base network
- Transaction is too complex or involves unknown contracts that cannot be decoded
- Network timeout or upstream RPC failure
- Payment of $0.04 USDC not fulfilled, returning 402 payment required

## How this service works

Give a Base transaction hash and Claude explains what it actually did in plain English — the action, a risk read (failed tx, risky approval, high-value transfer), and notes. Turns raw calldata into an answer agents and humans can use.

## Output

Returns a plain-English breakdown of the transaction: what action was performed (e.g. token swap, approval, transfer), a risk read flagging issues like failed tx, risky unlimited approvals, or high-value transfers, and additional contextual notes to help humans and agents understand what actually happened on-chain.

## 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"
    },
    "pathParams": {
     "type": "object"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "hash"
     ],
     "properties": {
      "hash": {
       "type": "string",
       "description": "Transaction hash"
      }
     }
    }
   },
   "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/base-transaction-explainer-ae5b6a68/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 402.com.tr](https://www.zero.xyz/host/402.com.tr/llms.txt)