# ABCD2 TIA Stroke Risk Score Calculator > ABCD2 TIA Stroke Risk Score Calculator is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-10). Calculates the ABCD2 score (Johnston 2007) to estimate early stroke risk after a transient ischemic attack (TIA), based on age, blood pressure, clinical features, symptom duration, and diabetes. ## Facts - Endpoint: GET https://api.magentlab.com/api/calc/abcd2?utm_source=zero.xyz - Price: $0.005/call - Payment: x402 - Status: unknown - Last checked: 2026-10-10 - Activations on Zero: 0 - Tags: x402 - Canonical page: https://www.zero.xyz/c/abcd2-tia-stroke-risk-score-calculator-0e24c48d - Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HdCRKGBywlkYF-oExse2_ 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 abcd2-tia-stroke-risk-score-calculator-0e24c48d ``` Example prompt: Calculate the ABCD2 stroke-risk score for a 68-year-old patient with TIA who had a systolic BP of 155 and diastolic of 92, presented with unilateral weakness, symptoms lasting 75 minutes, and has a history of diabetes. ## When to prefer this Use this endpoint when you need the specific ABCD2 (Johnston 2007) score — not ABCD (Rothwell 2005) or ABCD3-I — for early two-day stroke risk stratification after TIA. Ideal for clinical documentation workflows, automated triage tools, or risk band reporting where a deterministic, peer-cited formula is required and the caller already has all six input values from chart or triage data. ## Known failure modes - Missing required query parameters returns a validation error - Diastolic value equal to or exceeding systolic returns an error - Age outside 18–120 range or duration outside 0–1440 minutes is rejected - Invalid clinical_features enum string returns an error - Blood pressure values outside plausible ranges (systolic 50–250, diastolic 20–160) are rejected ## How this service works Deterministic published-formula arithmetic plus ICD-10-CM, RxNorm, and LOINC. Pay in USDC on Base via x402. ## Output Returns the numeric ABCD2 total score (0–7) and the corresponding risk band (low: 0–3, moderate: 4–5, high: 6–7), based on the deterministic Johnston 2007 scoring algorithm. Does not include a diagnosis or admission recommendation. ## 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": [ "age", "systolic_mm_hg", "diastolic_mm_hg", "clinical_features", "duration_min", "diabetes" ], "properties": { "age": { "type": "integer", "description": "Age in years (18-120). Age ≥60 scores 1; 59 scores 0." }, "diabetes": { "type": "boolean", "description": "Diabetes mellitus. true scores 1; false scores 0." }, "duration_min": { "type": "integer", "description": "Symptom duration in minutes (integer 0-1440). Under 10 scores 0; 10-59 scores 1; 60 or more scores 2." }, "systolic_mm_hg": { "type": "number", "description": "Cuff systolic blood pressure in mm Hg (50-250). ≥140 scores 1." }, "diastolic_mm_hg": { "type": "number", "description": "Cuff diastolic blood pressure in mm Hg (20-160). Must be less than systolic. ≥90 scores 1." }, "clinical_features": { "type": "string", "description": "Caller-assigned TIA features. none scores 0; speech_without_weakness scores 1; unilateral_weakness scores 2. Mutually exclusive. magent does not examine the patient." } } } }, "additionalProperties": false }, "output": { "type": "object", "required": [ "type" ], "properties": { "type": { "type": "string" }, "example": { "type": "object" } } } } } ``` ## Response schema (JSON Schema) ```json { "type": "json", "example": { "path": "/api/calc/abcd2", "count": 2, "items": [ { "score": 0, "formula": "abcd2", "citation": { "id": "johnston-2007", "doi": "10.1016/S0140-6736(07)60150-0", "title": "Validation and refinement of scores to predict very early stroke risk after transient ischaemic attack", "source": "Lancet. 2007;369(9558):283-292", "authors": "Johnston SC, Rothwell PM, Nguyen-Huynh MN, et al." }, "age_years": 55, "max_score": 7, "abcd2_band": "0-3", "components": [ { "value": 55, "factor": "age", "points": 0, "present": false }, { "factor": "blood_pressure", "points": 0, "present": false, "systolic_mm_hg": 120, "diastolic_mm_hg": 80 }, { "value": "none", "factor": "clinical_features", "points": 0, "present": false }, { "value": 5, "factor": "duration_min", "points": 0, "present": false }, { "factor": "diabetes", "points": 0, "present": false } ], "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.", "formula_expression": "ABCD2 = age_ge_60 + blood_pressure + clinical_features + duration + diabetes; age >=60 1; SBP >=140 or DBP >=90 1; none 0 / speech_without_weakness 1 / unilateral_weakness 2; duration <10 0, 10-59 1, >=60 2; diabetes 1; bands 0-3 / 4-5 / 6-7; max 7" }, { "score": 0, "formula": "abcd2", "citation": { "id": "johnston-2007", "doi": "10.1016/S0140-6736(07)60150-0", "title": "Validation and refinement of scores to predict very early stroke risk after transient ischaemic attack", "source": "Lancet. 2007;369(9558):283-292", "authors": "Johnston SC, Rothwell PM, Nguyen-Huynh MN, et al." }, "age_years": 55, "max_score": 7, "abcd2_band": "0-3", "components": [ { "value": 55, "factor": "age", "points": 0, "present": false }, { "factor": "blood_pressure", "points": 0, "present": false, "systolic_mm_hg": 120, "diastolic_mm_hg": 80 }, { "value": "none", "factor": "clinical_features", "points": 0, "present": false }, { "value": 5, "factor": "duration_min", … (truncated) ``` ## More - Live health (JSON, refreshed every minute): https://www.zero.xyz/c/abcd2-tia-stroke-risk-score-calculator-0e24c48d/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)