# x402 Chain Intel – Mempool Whale Transaction Scanner

> x402 Chain Intel – Mempool Whale Transaction Scanner is a paid API for AI agents from x402-chain-intel.vercel.app, paid per call via x402, $0.2/call, status unknown (last checked 2026-09-14).

Detects and returns large whale transactions currently pending in the blockchain mempool for trading bot intelligence

## Facts

- Endpoint: POST https://x402-chain-intel.vercel.app/api/mempool/whale-tx
- Price: $0.2/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-chain-intel-mempool-whale-transaction-scanner-5d35775e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KdBE5NZDrO60DQ_TFC1yv

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 x402-chain-intel-mempool-whale-transaction-scanner-5d35775e -d '<json body>'
```

Example prompt: Scan the Ethereum mempool right now for any unconfirmed transactions above 500 ETH and give me the sender addresses, destination addresses, transaction hashes, and estimated values so my trading bot can front-run or react to whale moves.

## When to prefer this

Choose this endpoint when you need real-time pre-confirmation intelligence on large on-chain transactions for algorithmic trading, MEV (miner extractable value) strategies, or whale monitoring dashboards. It is particularly valuable when you need to act before a transaction confirms rather than reading historical on-chain data.

## Known failure modes

- Mempool may be empty or low-activity during off-peak hours, returning no results
- Threshold filters that are too high may yield zero matches
- Network congestion can cause stale or incomplete mempool snapshots
- Missing or invalid filter parameters may return a 400 error
- x402 payment failure (402 response) if USDC balance is insufficient or payment not attached
- Vercel cold-start latency may cause timeouts on first call

## How this service works

27 paid endpoints for trading bots

## Output

Returns a list of large unconfirmed transactions currently sitting in the blockchain mempool, including transaction hashes, sender and receiver wallet addresses, transaction values, token symbols or contract addresses, and mempool position metadata useful for trading bots to act on pre-confirmation signals.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-chain-intel-mempool-whale-transaction-scanner-5d35775e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-chain-intel.vercel.app](https://www.zero.xyz/host/x402-chain-intel.vercel.app/llms.txt)