# Crypto ETF Sentinel — Side-by-Side ETF Comparison

> Crypto ETF Sentinel — Side-by-Side ETF Comparison is a paid API for AI agents from api.cryptoetfsentinel.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-14).

Returns a side-by-side comparison of two US spot crypto ETFs including POS AM profiles, XBRL financials, market data, and Fund Health metrics for two specified CIKs.

## Facts

- Endpoint: GET https://api.cryptoetfsentinel.com/v1/profiles/comparison
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-cryptoetfsentinel-com-c6db176b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_X_jw2nPI_YA-wvOYj6wsE

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 api-cryptoetfsentinel-com-c6db176b
```

Example prompt: Compare these two US spot crypto ETFs side by side — CIK 0001980994 vs CIK 0001541439 — I want to see their POS AM profiles, XBRL financials, expense ratios, and Fund Health metrics.

## When to prefer this

Use this endpoint when you need a direct head-to-head comparison of exactly two US spot crypto ETFs by their SEC CIK numbers, combining regulatory profile data, XBRL financials, and fund health analytics in a single call. Prefer this over single-issuer endpoints when the task requires benchmarking or contrasting two funds simultaneously.

## Known failure modes

- Missing cik_a or cik_b query parameters returns a 400 or validation error
- Invalid or non-existent CIK returns empty or error response
- Market data fetch failure causes Fund Health fields to be null
- Non-trading or non-spot crypto ETF CIK may return incomplete profile data
- Payment not provided or invalid results in 402 Payment Required response

## How this service works

Crypto ETF Sentinel — Side-by-side comparison of ALL trading US spot crypto ETFs: POS AM profile, XBRL financials, market data and Fund Health metrics (premium/discount, tracking, implied NAV) per fund. Use when choosing between crypto ETFs or building a comparison table in one call. No params. Some Fund Health fields can be null if the market-data fetch fails.

## Output

Returns a structured JSON object containing a side-by-side comparison for two US spot crypto ETFs identified by their SEC CIK numbers. Includes POS AM-extracted fields (custodian, authorized participants, in-kind redemption), XBRL financial data (AUM, NAV per share, shares outstanding, expense ratio), live or recent market data, and derived Fund Health metrics. Some Fund Health fields may be null if market-data fetch fails.

## Example request

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {
   "cik_a": "0001980994",
   "cik_b": "0001541439"
  }
 }
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-cryptoetfsentinel-com-c6db176b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.cryptoetfsentinel.com](https://www.zero.xyz/host/api.cryptoetfsentinel.com/llms.txt)