Crypto ETF Sentinel — Week-over-week pipeline delta for US spot crypto ETFs: change in stage counts, filings-7d, under-review count vs. a prior daily snapshot. Returns 404 (no charge) when no snapshot exists for the requested ``days_back``.
| Network | Scheme | Amount | Pay To |
|---|---|---|---|
| Base | exact | $0.10 USDC | 0x169B...83d1 |
| solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp | exact | 0.10 tokens | Ezzbt3...pMxk |