https://api.cryptoetfsentinel.com/v1/xbrl/fee-war/history
https://api.cryptoetfsentinel.com/v1/xbrl/fee-war/historyOverview
Historical expense-ratio trajectory per issuer — the fee-war timeline. Crypto ETF Sentinel — regulatory data oracle for US spot crypto ETFs. Pay in USDC on Base or Solana.
Protocol
x402
Price
—
Payment Asset
USD Coin
Payment Network
eip155:8453
Category
finance/etf-data
Provider
cryptoetfsentinel
Source
bazaar
Indexed
2026-05-12 14:55:50
Health
Status
healthy
Latency (p50)
42ms
Uptime (30d)
100.0%
Reliability Score
100/100
Last Checked
2026-07-21 11:39:14
Last Healthy
2026-07-21 11:39:14
Consecutive Failures
0
x402 Payment Validation
Payment Requirements
Valid
Asset Verified
Known USDC
Facilitator
—
Recent Health Checks
| Time | Status | HTTP | Latency | Error |
|---|---|---|---|---|
| 2026-07-21 11:39:14 | healthy | 402 | 39ms | |
| 2026-07-21 07:01:18 | healthy | 402 | 42ms |