# BaseBuilder Trading Whale Entry Signal

> BaseBuilder Trading Whale Entry Signal is a paid API for AI agents from bb-trading-gold.vercel.app, paid per call via x402, $0.066653/call, status unknown (last checked 2026-10-23).

Detects whale entry signals for crypto tokens on Base chain to inform trading decisions

## Facts

- Endpoint: POST https://bb-trading-gold.vercel.app/api/holder/whale-entry?utm_source=zero.xyz
- Price: $0.066653/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/basebuilder-trading-whale-entry-signal-cdc8c84b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_a6ieyWGamCukhF9vWM7bI

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 basebuilder-trading-whale-entry-signal-cdc8c84b -d '<json body>'
```

Example prompt: Check BaseBuilder Trading for whale entry signals on the Base chain token at address 0xAbC123... and tell me if any large holders have recently entered a position.

## When to prefer this

Use this endpoint when you need on-chain whale entry detection specifically for Base chain tokens and want a pre-processed trading signal rather than raw blockchain data. Preferred over generic block explorers when you need actionable buy signals based on large holder behavior.

## Known failure modes

- Invalid or unrecognized token address returns an error or empty result
- Token has no whale activity and returns null or empty signal
- Rate limit exceeded due to high request volume
- Payment of 0.066653 USDC not processed correctly via x402 protocol resulting in 402 response
- Network timeout or Vercel cold start causing delayed or failed response

## How this service works

BaseBuilder Trading API hub - 20 paid endpoints

## Output

Returns whale entry signal data including detected large holder activity, entry price levels, wallet addresses of whales entering the token, and signal confidence for a given Base chain token.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/basebuilder-trading-whale-entry-signal-cdc8c84b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bb-trading-gold.vercel.app](https://www.zero.xyz/host/bb-trading-gold.vercel.app/llms.txt)