# Crypto ETF Sentinel – XBRL Time Series for Single Issuer

> Crypto ETF Sentinel – XBRL Time Series for Single Issuer is a paid API for AI agents from api.cryptoetfsentinel.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).

Returns a historical quarterly time series for one XBRL concept (AUM, NAV, shares outstanding, expense ratio, etc.) for a specific crypto ETF issuer identified by CIK.

## Facts

- Endpoint: GET https://api.cryptoetfsentinel.com/v1/xbrl/issuers/0001980994/series
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-cryptoetfsentinel-com-8cd5d210
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TNXXyDgosoR_ln9D0QNCC

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-8cd5d210
```

Example prompt: Can you pull the full quarterly historical time series for AUM on the crypto ETF issuer with CIK 0001980994 from Crypto ETF Sentinel?

## When to prefer this

Use this endpoint when you need a historical trend or time series for a specific XBRL financial concept (AUM, NAV, shares outstanding, expense ratio) on a single crypto ETF issuer, rather than just the latest snapshot. Prefer this over the single-issuer snapshot endpoint when temporal analysis, trend detection, or quarter-over-quarter comparison is the goal.

## Known failure modes

- Issuer CIK not found – returns 404 if the CIK does not correspond to a tracked crypto ETF issuer
- XBRL concept not available for issuer – some issuers may not have filed certain concepts, returning empty series
- No historical data yet – newly listed ETFs may have only one or zero quarterly data points
- Payment not authorized – x402 payment required; missing or invalid payment header returns 402
- Rate limiting or quota exceeded – returns 429 if too many calls are made in a short period

## How this service works

Historical time series for one XBRL concept (AUM, NAV, shares-outstanding, etc.) on one issuer. Quarterly cadence.

## Output

A quarterly time series array of values for the requested XBRL concept (e.g. AUM, NAV per share, shares outstanding, or expense ratio) for the specified issuer CIK, with each entry date-stamped by reporting period, derived from SEC XBRL filings.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-cryptoetfsentinel-com-8cd5d210/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)