# Crypto ETF Sentinel Pipeline Deltas

> Crypto ETF Sentinel Pipeline Deltas 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 week-over-week delta metrics for the US spot crypto ETF approval pipeline: changes in stage counts, filings in last 7 days, and under-review count vs. a prior daily snapshot.

## Facts

- Endpoint: GET https://api.cryptoetfsentinel.com/v1/pipeline/deltas
- 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-00a535e9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pI8T6JJdC3eBmrpDOajwt

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-00a535e9
```

Example prompt: Pull the Crypto ETF Sentinel pipeline deltas for 7 days back and tell me how the US spot crypto ETF approval stages have shifted — specifically how many more or fewer filings and under-review ETFs there are compared to that snapshot.

## When to prefer this

Use this endpoint when you need to understand directional changes in the US spot crypto ETF regulatory pipeline over time — specifically how stage counts and filing activity have shifted relative to a prior snapshot. Prefer this over static directory endpoints when the goal is trend detection or monitoring rather than point-in-time lookup.

## Known failure modes

- 404 returned when no snapshot exists for the requested days_back value (no charge applied)
- Invalid days_back parameter may result in a 400 or empty response
- Service unavailable if underlying SEC data pipeline has not refreshed

## How this service works

Crypto ETF Sentinel — Week-over-week pipeline delta for US spot crypto ETFs: change in stage counts, filings-7d and under-review count vs a prior daily snapshot (days_back, default 7, max 90). Use when you want the net movement of the crypto ETF pipeline since your last check rather than a full snapshot. Returns 404 (no charge) when no snapshot exists.

## Output

A JSON object containing week-over-week pipeline delta metrics: changes in count per regulatory stage (e.g. registration_filed, under_review, launch_imminent, trading), number of new filings in the last 7 days, and delta in under-review count relative to the prior daily snapshot. Returns 404 (no charge) if no snapshot exists for the requested days_back value.

## Example request

```json
{
 "type": "http",
 "method": "GET",
 "queryParams": {
  "days_back": "7"
 }
}
```

## 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-00a535e9/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)