# CP-SSS Calculator (Cincinnati Prehospital Stroke Severity Scale)

> CP-SSS Calculator (Cincinnati Prehospital Stroke Severity Scale) is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).

Computes the Katz 2015 Cincinnati Prehospital Stroke Severity Scale (CP-SSS) score from gaze deviation, level of consciousness, and arm weakness to flag potential large-vessel occlusion stroke.

## Facts

- Endpoint: GET https://api.magentlab.com/api/calc/cpsss
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/cp-sss-calculator-cincinnati-prehospital-stroke-severity-scale-f1f6a466
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kigoWpBMW7oYK6a0Sw74N

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 cp-sss-calculator-cincinnati-prehospital-stroke-severity-scale-f1f6a466
```

Example prompt: Score this suspected stroke patient on the Cincinnati Prehospital Stroke Severity Scale: gaze deviation is present (score 2), the patient cannot correctly answer their age or follow commands (LOC abnormal), and the arm falls without sustained effort — do the math and tell me if the score suggests a severe stroke.

## When to prefer this

Use this endpoint when you need a programmatic, auditable CP-SSS calculation based on the Katz 2015 three-item scale (gaze deviation, LOC, arm weakness) — especially in prehospital or emergency triage workflows where consistent scoring and large-vessel occlusion flagging are needed. Prefer this over manual arithmetic when integrating stroke scoring into an automated clinical decision-support pipeline. Do not use as a substitute for the classic three-item CPSS (facial droop/arm drift/speech), for NIHSS computation, or for tPA eligibility determination.

## Known failure modes

- Missing required query parameters (gaze_deviation, loc_abnormal, arm_weakness) returns a validation error
- gaze_deviation supplied as 1 instead of 0 or 2 is rejected (enum constraint)
- Network or payment failure returns HTTP 402 or 5xx
- Caller misclassifies clinical findings before input — garbage in, garbage out; the API cannot examine the patient

## How this service works

Katz 2015 Cincinnati Prehospital Stroke Severity Scale (CP-SSS): gaze deviation 2 if present else 0 + abnormal LOC 1 + arm cannot hold 10 s 1. Max 4. severe_stroke_suggested iff score ≥ 2. Not the 3-item CPSS facial/arm/speech screen, not NIHSS, not a tPA decision. magent does not examine the patient.

## Output

Returns the total CP-SSS score (integer 0–4, where gaze deviation contributes 0 or 2 points and each of LOC abnormality and arm weakness contribute 1 point each), plus a boolean or equivalent flag indicating whether the score is ≥ 2 (severe stroke suggested). Does not make treatment decisions or tPA recommendations.

## 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"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    },
    "queryParams": {
     "type": "object",
     "required": [
      "gaze_deviation",
      "loc_abnormal",
      "arm_weakness"
     ],
     "properties": {
      "arm_weakness": {
       "type": "boolean",
       "description": "Caller-assigned Katz 2015 arm weakness: cannot hold arm up for 10 s (arm falls or no effort against gravity). true if present. magent does not examine the patient."
      },
      "loc_abnormal": {
       "type": "boolean",
       "description": "Caller-assigned Katz 2015 incorrect level of consciousness (cannot answer age or current month correctly, or cannot follow commands). true if abnormal, false if normal. magent does not examine the patient."
      },
      "gaze_deviation": {
       "enum": [
        0,
        2
       ],
       "type": "integer",
       "description": "Caller-assigned Katz 2015 conjugate gaze deviation. Integer 0 absent or 2 present (not 1). magent does not examine the patient."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cp-sss-calculator-cincinnati-prehospital-stroke-severity-scale-f1f6a466/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.magentlab.com](https://www.zero.xyz/host/api.magentlab.com/llms.txt)