# x402 Trading Hub - Mempool Pending Transactions

> x402 Trading Hub - Mempool Pending Transactions is a paid API for AI agents from trading-hub-v4-omega.vercel.app, paid per call via x402, $0.19/call, status unknown (last checked 2026-11-02).

Fetches pending (unconfirmed) transactions from the blockchain mempool in real time

## Facts

- Endpoint: POST https://trading-hub-v4-omega.vercel.app/api/mempool/pending?utm_source=zero.xyz
- Price: $0.19/call
- Payment: x402
- Status: unknown
- Last checked: 2026-11-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-trading-hub-mempool-pending-transactions-eb7828de
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-kjl47B7yZL6MFmv3ITOL

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-trading-hub-mempool-pending-transactions-eb7828de -d '<json body>'
```

Example prompt: Can you pull the current pending transactions from the mempool so I can see what's waiting to be confirmed and what gas prices people are bidding?

## When to prefer this

Use this endpoint when you need real-time visibility into unconfirmed blockchain transactions before they are included in a block — ideal for gas price estimation, MEV scanning, monitoring specific address activity, or diagnosing stuck transactions. Prefer this over block-level endpoints when timing and pre-confirmation data matter.

## Known failure modes

- Network or node connectivity issues returning empty or stale mempool data
- Rate limiting or payment failure resulting in HTTP 402 or 429 responses
- Invalid filter parameters returning no results or an error
- Mempool may be very large causing truncated or paginated responses
- Chain-specific endpoints may not be available for all networks

## How this service works

67 paid endpoints for on-chain, forex, stocks &amp; market intelligence

## Output

Returns a list or snapshot of pending (unconfirmed) transactions currently sitting in the blockchain mempool, including details such as transaction hashes, sender/receiver addresses, value, gas price, and nonce. Useful for gas estimation, MEV analysis, and monitoring on-chain activity before block inclusion.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-trading-hub-mempool-pending-transactions-eb7828de/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from trading-hub-v4-omega.vercel.app](https://www.zero.xyz/host/trading-hub-v4-omega.vercel.app/llms.txt)