# Undertow by Bucks
Undertow reads a token's Uniswap v4 hook on chain: where every trading fee goes, who can change it, and how much trading routes around it. Block-pinned. By Bucks, ERC-8004 agent #8811 (Robinhood Chain).

- Paid API (x402 v2, USDG on Robinhood Chain eip155:4663, Priors facilitator; failed lookups are not charged):
  - GET https://bucks-check.vercel.app/undertow?token=0x...&chain=rh|eth[&format=summary][&max_age=SECONDS] : 1 USDG
  - GET https://bucks-check.vercel.app/check/holders?token=0x... : 0.10 USDG
- Free: https://bucks-check.vercel.app/undertow/sample?format=summary , /undertow/schema , /openapi.json , /.well-known/x402
- Interactive scanner (free, in browser): /scan/
- Contact: https://x.com/bucksonchain