# Crypto ETF Sentinel — Recent Notable SEC Filings & Comment Letters Feed

> Crypto ETF Sentinel — Recent Notable SEC Filings & Comment Letters Feed is a paid API for AI agents from api.cryptoetfsentinel.com, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-14).

Returns an activity feed of recent notable SEC filings and comment letters for US spot crypto ETFs, filtered to drop trading-stage housekeeping noise, covering the last 60 days by default.

## Facts

- Endpoint: GET https://api.cryptoetfsentinel.com/v1/events
- Price: $0.1/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-3b09fe94
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_A1mFrA9FPBPpzwlV_qIKy

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-3b09fe94
```

Example prompt: What notable SEC filings and comment letters have come in for US spot crypto ETFs over the last 60 days? Filter out the trading-stage housekeeping noise so I just see the meaningful regulatory activity.

## When to prefer this

Use this endpoint when you need a curated, noise-filtered heartbeat of crypto ETF regulatory activity rather than a raw firehose of all SEC filings. Ideal for monitoring agents that need to detect meaningful regulatory changes without being overwhelmed by routine operational filings. Prefer over the raw filings feed when you want stage-filtered events only.

## Known failure modes

- No events in window: returns empty data array with total=0 if no notable filings in the period
- Payment required: 402 response if x402 USDC payment not provided
- Rate limit: 429 if too many calls in a short period
- Service unavailable: 503 if SEC EDGAR upstream is temporarily unreachable

## How this service works

Crypto ETF Sentinel — Activity feed of recent notable SEC filings and comment letters for US spot crypto ETFs (Bitcoin, Ethereum, Solana, XRP and more; last 60 days by default): S-1, 424B, 8-A12B, CERT, EFFECT and review correspondence, stage-filtered to drop trading-stage housekeeping. Use when a monitoring agent needs a 'what changed in crypto ETF regulation' heartbeat. Optional days and limit.

## Output

A stage-filtered chronological feed of notable SEC filing events and comment letters for US spot crypto ETFs from the last 60 days, including event type, issuer, filing date, and regulatory stage — with routine trading-stage housekeeping entries removed to surface only meaningful regulatory signals.

## Example request

```json
{
 "properties": "crypto_etf_filings"
}
```

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": [
   {
    "cik": "0002090011",
    "link": "https://www.sec.gov/Archives/edgar/data/.../THYP_8A_Cert_2090011.pdf",
    "crypto": "hyperliquid",
    "company": "21Shares Hyperliquid ETF",
    "timestamp": "2026-05-11T00:00:00+00:00",
    "event_type": "filing",
    "description": "21Shares Hyperliquid ETF certified for exchange listing",
    "filing_type": "CERT"
   }
  ],
  "meta": {
   "total": 1
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-cryptoetfsentinel-com-3b09fe94/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)