# x402 Chain Intel – Pending Mempool Transactions

> x402 Chain Intel – Pending Mempool Transactions is a paid API for AI agents from x402-chain-intel.vercel.app, paid per call via x402, $0.19/call, status unknown (last checked 2026-09-14).

Fetches pending (unconfirmed) mempool transactions from the blockchain for trading bot analysis

## Facts

- Endpoint: POST https://x402-chain-intel.vercel.app/api/mempool/pending
- Price: $0.19/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-pending-mempool-transactions-7f0fee1e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KZiQuUiRRMIasFEXnO_Jp

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-pending-mempool-transactions-7f0fee1e -d '<json body>'
```

Example prompt: Pull the current pending mempool transactions on Ethereum so I can see any large unconfirmed DEX swaps my trading bot should be aware of right now.

## When to prefer this

Choose this endpoint when you need real-time visibility into unconfirmed blockchain transactions for time-sensitive trading strategies such as MEV detection, sandwich attack monitoring, or front-running analysis. Prefer this over block-confirmed data endpoints when sub-block latency matters. Best suited for automated trading bots that need mempool intelligence priced per-call at $0.19 USDC via the x402 payment protocol.

## Known failure modes

- Mempool node temporarily unavailable returns 5xx error
- Invalid or unsupported chain parameter returns 4xx
- Payment verification failure returns 402 if USDC payment is not correctly attached
- Empty result if mempool is unusually low-activity
- Stale data if node is lagging behind the network tip

## How this service works

27 paid endpoints for trading bots

## Output

Returns a list of pending (unconfirmed) blockchain transactions currently sitting in the mempool, likely including transaction hashes, sender/receiver addresses, token amounts, gas prices, and timestamps — structured for consumption by trading bots and on-chain analytics tools.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-chain-intel-pending-mempool-transactions-7f0fee1e/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)