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Crypto ETF Sentinel — Fee War (Expense Ratio Leaderboard)
x402
Crypto ETF Sentinel — Fee War (Expense Ratio Leaderboard) is a paid API for AI agents from api.cryptoetfsentinel.com, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-15).
Returns the current expense ratio for every trading US spot crypto ETF, sorted cheapest first, with outliers capped at 200bps to filter bad XBRL extractions.
Price / call$0.1
Success—
StatusUnknown
How this service works
Crypto ETF Sentinel — Crypto ETF fee comparison: current expense ratio for every trading US spot crypto ETF, cheapest first, outlier-capped at 200 bps to drop bad XBRL extractions. Use when finding the lowest-cost Bitcoin, Ethereum or other crypto ETF, or benchmarking a fee. Optional crypto filter.
Output
An array of all currently trading US spot crypto ETFs ordered by expense ratio ascending, with each entry including ticker, issuer, and expense ratio in basis points. Values are outlier-capped at 200bps to exclude likely XBRL extraction errors. Includes pagination metadata (total, limit, offset) and an error field.
Example use cases
Finding the cheapest crypto ETF for a client
“Help me find the lowest-cost US spot crypto ETF right now — pull up the full fee leaderboard so I can recommend the most expense-efficient option to my client who's looking to invest in Bitcoin.”
Monitoring crypto ETF fee war dynamics
“Can you keep tabs on how crypto ETF fees are moving week over week? I want to track when the major issuers cut their expense ratios and see if there's a competitive pricing trend emerging across spot Bitcoin and Ethereum ETFs.”
Comparing management fees across issuers
“Show me how the different crypto ETF issuers stack up on fees right now — I'm trying to understand which companies are being most aggressive on pricing and whether any of them have recently dropped their costs to stay competitive.”
Technical details
Endpoint
GEThttps://api.cryptoetfsentinel.com/v1/xbrl/fee-warWhen to prefer
Use this endpoint when you need a ranked, clean snapshot of all live US spot crypto ETF fees in one call — especially for fee competition analysis, cheapest-fund selection, or monitoring fee-cutting events. Prefer over single-issuer endpoints when you need the full cohort view rather than one fund's details.
Side effects
- No ETFs in trading status — empty data array returned
- XBRL source data temporarily unavailable — stale or partial results
- Payment not included or insufficient — 402 Payment Required response
- Rate limit exceeded — HTTP 429
- Upstream SEC XBRL pipeline outage — error field populated in response
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
{
"_truncated": true,
"_originalSize": 16375
}Schema · Response
{
"type": "json",
"example": {
"data": [
{
"cik": "0001980994",
"name": "iShares Bitcoin Trust",
"ticker": "IBIT",
"fee_bps": 25,
"fee_pct": "0.25%"
}
],
"meta": {
"total": 1
}
}
}Tags
x402
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