# Wells PE Score Calculator > Wells PE 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 2026-10-12). Computes the Wells pulmonary embolism probability score from seven discrete clinical flags, returning both three-tier and two-tier risk bands. ## Facts - Endpoint: GET https://api.magentlab.com/api/calc/wells_pe?utm_source=zero.xyz - Price: $0.005/call - Payment: x402 - Status: unknown - Last checked: 2026-10-12 - Activations on Zero: 0 - Tags: x402 - Canonical page: https://www.zero.xyz/c/wells-pe-score-calculator-0c8441b7 - Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_v4vDN7AqVzr3ZwPfUFU9q 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 wells-pe-score-calculator-0c8441b7 ``` Example prompt: Calculate the Wells PE score for a patient who has clinical signs of DVT, PE is the number-one diagnosis, heart rate over 100, was immobilized for more than 3 days, has a history of previous DVT, no hemoptysis, and no active malignancy. ## When to prefer this Use this endpoint when you need a fast, deterministic, published Wells PE risk stratification from seven binary clinical flags without any free-text interpretation. Prefer it over general clinical reasoning endpoints when you need a citable, reproducible score that maps directly to the Wells 2000 literature — particularly in ED triage, telemedicine decision support, or prior-authorization workflows requiring documented pre-test probability. ## Known failure modes - Missing required query parameter returns validation error - Invalid boolean value for any flag causes schema rejection - All flags false returns valid low-risk score (not an error) - Network timeout if server is temporarily unavailable ## 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 Wells PE score along with a three-tier risk classification (low, moderate, high) and a two-tier classification (PE unlikely vs. PE likely), with a citation to the published Wells 2000/2001 scoring methodology. The result is deterministic and not a clinical diagnosis. ## 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": [ "signs_dvt", "pe_number_one", "hr_gt_100", "immobilization_or_surgery", "previous_dvt_pe", "hemoptysis", "malignancy" ], "properties": { "hr_gt_100": { "type": "boolean", "description": "Heart rate >100 (1.5 points)." }, "signs_dvt": { "type": "boolean", "description": "Clinical signs and symptoms of DVT (3 points)." }, "hemoptysis": { "type": "boolean", "description": "Hemoptysis (1 point)." }, "malignancy": { "type": "boolean", "description": "Malignancy with treatment in last 6 months or palliative (1 point)." }, "pe_number_one": { "type": "boolean", "description": "PE is the number-one diagnosis or equally likely (3 points)." }, "previous_dvt_pe": { "type": "boolean", "description": "Previous DVT or PE (1.5 points)." }, "immobilization_or_surgery": { "type": "boolean", "description": "Immobilization ≥3 days or surgery in previous 4 weeks (1.5 points)." } } } }, "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/wells_pe", "count": 2, "items": [ { "score": 6, "formula": "wells_pe", "citation": { "id": "wells-pe-2001", "doi": "10.7326/0003-4819-135-2-200107170-00010", "title": "Excluding pulmonary embolism at the bedside without diagnostic imaging: management of patients with suspected pulmonary embolism presenting to the emergency department by using a simple clinical model and d-dimer", "source": "Ann Intern Med. 2001;135(2):98-107", "authors": "Wells PS, Anderson DR, Rodger M, et al." }, "two_tier": "likely", "max_score": 12.5, "components": [ { "factor": "signs_dvt", "points": 3, "present": true }, { "factor": "pe_number_one", "points": 3, "present": true }, { "factor": "hr_gt_100", "points": 0, "present": false }, { "factor": "immobilization_or_surgery", "points": 0, "present": false }, { "factor": "previous_dvt_pe", "points": 0, "present": false }, { "factor": "hemoptysis", "points": 0, "present": false }, { "factor": "malignancy", "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.", "three_tier": "moderate", "formula_expression": "Wells PE = 3*signs_dvt + 3*pe_number_one + 1.5*hr_gt_100 + 1.5*immobilization_or_surgery + 1.5*previous_dvt_pe + 1*hemoptysis + 1*malignancy" }, { "score": 6, "formula": "wells_pe", "citation": { "id": "wells-pe-2001", "doi": "10.7326/0003-4819-135-2-200107170-00010", "title": "Excluding pulmonary embolism at the bedside without diagnostic imaging: management of patients with suspected pulmonary embolism presenting to the emergency department by using a simple clinical model and d-dimer", "source": "Ann Intern Med. 2001;135(2):98-107", "authors": "Wells PS, Anderson DR, Rodger M, et al." }, "two_tier": "likely", "max_score": 12.5, "components": [ { "factor": "signs_dvt", "points": 3, "present": true }, { "factor": "pe_number_one", "points": 3, "present": true }, { "factor": "hr_gt_100", "points": 0, … (truncated) ``` ## More - Live health (JSON, refreshed every minute): https://www.zero.xyz/c/wells-pe-score-calculator-0c8441b7/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)