# FINRA Short Interest Lookup

> FINRA Short Interest Lookup is a paid API for AI agents from marketdata.use.x402atlas.com, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-15).

Returns FINRA short interest data for a US stock ticker, including shares sold short, days-to-cover ratio, and average volume as a short-squeeze sentiment signal.

## Facts

- Endpoint: GET https://marketdata.use.x402atlas.com/short-interest
- Price: $0.015/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/finra-short-interest-lookup-e23a0b6c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Wnb09Szq0h1sfXaF9nXlO

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 finra-short-interest-lookup-e23a0b6c
```

Example prompt: What's the current FINRA short interest for GameStop (GME) — I want to know the shares sold short, days-to-cover, and whether it looks like a short squeeze candidate?

## When to prefer this

Use this endpoint when you need official FINRA-sourced short interest metrics for a specific US-listed stock, particularly for short-squeeze analysis, sentiment gauging, or fundamental research. Prefer this over FINRA daily short-sale volume endpoints when you need cumulative short interest position data (shares outstanding short) rather than single-day short volume. Best for equities-focused agents doing market research, risk assessment, or trading signal generation.

## Known failure modes

- Invalid or unrecognized ticker symbol returns an error or empty result
- Non-US ticker symbols may not be covered by FINRA data
- Limit parameter exceeds maximum of 50000 returns a validation error
- Service unavailable or payment failure returns a 402 or 5xx error
- Stale data if FINRA has not yet published the latest reporting period

## How this service works

FINRA short interest for a US stock — shares sold short, days-to-cover and average volume, a short-squeeze sentiment signal.

## Output

Returns FINRA-sourced short interest data for the requested US stock ticker, including the number of shares currently sold short, the days-to-cover ratio (short interest divided by average daily volume), and average trading volume — providing a quantitative short-squeeze sentiment signal.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "ticker"
     ],
     "properties": {
      "limit": {
       "type": "integer",
       "maximum": 50000,
       "minimum": 1,
       "description": "Max results returned"
      },
      "ticker": {
       "type": "string",
       "description": "US stock ticker, e.g. AAPL"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "queried_at",
      "ticker",
      "count",
      "records"
     ],
     "properties": {
      "count": {
       "type": "integer",
       "description": "Number of records returned."
      },
      "ticker": {
       "type": "string",
       "description": "Echo of the requested ticker."
      },
      "records": {
       "type": "array",
       "items": {
        "type": "object",
        "required": [
         "short_interest"
        ],
        "properties": {
         "days_to_cover": {
          "type": "number",
          "description": "short_interest / avg_daily_volume."
         },
         "short_interest": {
          "type": "integer",
          "description": "Total shares sold short."
         },
         "settlement_date": {
          "type": "string",
          "format": "date"
         },
         "avg_daily_volume": {
          "type": "integer"
         }
        }
       },
       "description": "FINRA bi-weekly short-interest history, most recent first."
      },
      "queried_at": {
       "type": "string",
       "format": "date-time",
       "description": "UTC timestamp when this bridge queried the upstream."
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "count": 1,
  "ticker": "A",
  "records": [
   {
    "days_to_cover": 1.67,
    "short_interest": 3906231,
    "settlement_date": "2025-03-14",
    "avg_daily_volume": 2340158
   }
  ],
  "queried_at": "2026-07-06T12:00:00Z"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/finra-short-interest-lookup-e23a0b6c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from marketdata.use.x402atlas.com](https://www.zero.xyz/host/marketdata.use.x402atlas.com/llms.txt)