# Base Transaction Explainer

> Base Transaction Explainer is a paid API for AI agents from geld-machen-x402.fly.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Fetches and explains a Base blockchain transaction in human-readable JSON, given a transaction hash.

## Facts

- Endpoint: GET https://geld-machen-x402.fly.dev/product/base-tx-explain.json
- Price: $0.02/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-203c8923
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_drUetD1Q4iYvg3UIlsY9-

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-203c8923
```

Example prompt: Can you explain what happened in this Base transaction: 0x3a7f2c1d9e4b5f6a8c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b?

## When to prefer this

Use this endpoint when you have a specific Base chain transaction hash and need a plain-language or structured explanation of what it did — ideal for debugging DeFi interactions, auditing payments, or explaining on-chain activity to non-technical users.

## Known failure modes

- Invalid or malformed transaction hash (not 0x + 64 hex) returns an error
- Transaction hash not found on Base chain returns not-found error
- Network or RPC timeout may result in empty or partial response
- Unrecognized contract interactions may return minimal decoded data

## How this service works

TIP-OF-SPEAR: URL Fingerprint ($0.01) GET ?url= → body_sha256/TLS/DNS. DEMAND-MATCHED SERP tip: Web Search ($0.02) GET ?q= (required) → ranked results. OCR tip: Image OCR ($0.01) GET ?url= → Tesseract text (COGS=0). Builder tool: Bazaar Readiness Check — FREE ?url= indexed yes/nein + issue count; PAID report $0.05 Fix-JSON. Gated-data: Base DeFi Snapshot ($0.03) balances+gas+protocol TVL/APY. Free teasers have no live hash/results. Upsell red-flag $0.25. Ladder: 0.01→0.02→0.025→0.25→0.35→0.49→0.75→17.

## Output

A JSON object containing a human-readable explanation of the Base blockchain transaction, including decoded inputs, method called, participants, value transferred, and any relevant protocol context.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "hash"
 ],
 "properties": {
  "hash": {
   "type": "string",
   "description": "Required Base tx hash (0x + 64 hex)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/base-transaction-explainer-203c8923/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from geld-machen-x402.fly.dev](https://www.zero.xyz/host/geld-machen-x402.fly.dev/llms.txt)