# 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 by its hash, returning human-readable details about what occurred on-chain

## Facts

- Endpoint: GET https://geld-machen-x402.fly.dev/product/base-tx-explain
- 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-8d8ec895
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_s0vZSIgM-iV1u3ACT6pf-

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-8d8ec895
```

Example prompt: Can you explain what happened in this Base transaction: 0x3a1b2c4d5e6f7890abcdef1234567890abcdef1234567890abcdef1234567890ab?

## When to prefer this

Use this endpoint when you have a specific Base network transaction hash and need a plain-English explanation of what occurred on-chain. Prefer this over a generic block explorer when you need structured, agent-consumable output rather than a UI. Best suited for Base (Coinbase L2) transactions specifically, not Ethereum mainnet or other chains.

## Known failure modes

- Invalid or malformed transaction hash (missing 0x prefix or wrong length) returns an error
- Transaction hash not found on Base network returns not-found error
- Network or RPC timeout causes delayed or failed response
- Response schema is empty so exact error format is undocumented

## 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 human-readable explanation of the specified Base blockchain transaction, including details about what type of activity occurred (e.g. swap, transfer, mint, contract interaction), amounts, addresses involved, and outcome.

## 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-8d8ec895/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)