# ARC-HBR High Bleeding Risk Calculator (Urban 2019 Table 3) > ARC-HBR High Bleeding Risk Calculator (Urban 2019 Table 3) is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15). Evaluates ARC-HBR (Academic Research Consortium - High Bleeding Risk) criteria for PCI patients: classifies as high bleeding risk if ≥1 major or ≥2 minor criteria are met, per Urban 2019 Table 3. ## Facts - Endpoint: GET https://api.magentlab.com/api/calc/arc_hbr - Price: $0.005/call - Payment: x402 - Status: unknown - Last checked: 2026-09-15 - Activations on Zero: 0 - Tags: x402 - Canonical page: https://www.zero.xyz/c/arc-hbr-high-bleeding-risk-calculator-urban-2019-table-3-c3915bd7 - Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9Ra4KxyNybOane4HnK1o- 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 arc-hbr-high-bleeding-risk-calculator-urban-2019-table-3-c3915bd7 ``` Example prompt: For my patient scheduled for PCI who is 78 years old with moderate CKD (eGFR 35), on long-term OAC, with a prior spontaneous intracranial hemorrhage, and currently on chronic NSAIDs — can you run the ARC-HBR assessment and tell me if they meet high bleeding risk criteria under the Urban 2019 Table 3 definition? ## When to prefer this Use this endpoint when you need a standards-compliant, auditable ARC-HBR binary classification per the Urban 2019 Table 3 consensus definition for a PCI patient, where the calling system has already resolved lab values (eGFR, hemoglobin, platelet count) and clinical facts into boolean criteria. Do not use if you need a continuous weighted score, DAPT duration guidance, a medical device decision, or if you expect the service to interpret raw lab values or imaging. ## Known failure modes - HTTP 400 (mutex violation): mutually exclusive fields both set to true — e.g. severe_or_esrd_ckd and moderate_ckd both true, or hemoglobin_lt_11 and mild_anemia both true, or major and minor bleed both true, or moderate_severe_ischemic_stroke_6mo and any_ischemic_stroke_not_major both true - Missing required boolean query parameters returns a validation error - All boolean fields must be explicitly provided; omission of required fields will cause a 400/422 error - Payment failure if x402 USDC micropayment of $0.005 is not completed before the request ## How this service works ARC-HBR (Urban 2019 Table 3). High bleeding risk at PCI iff ≥1 major or ≥2 minor. Binary; no weighted point score. Caller-assigned booleans; magent does not assay labs or read NIHSS. Mutex (400): severe vs moderate CKD, Hb <11 vs mild anemia, major vs minor bleed, moderate-severe stroke <6 mo vs any other ischemic stroke. Not a DAPT duration. Not a medical device. ## Output Returns a binary high-bleeding-risk flag (true/false) indicating whether the patient meets ARC-HBR criteria (≥1 major or ≥2 minor criteria from Urban 2019 Table 3), along with counts of major and minor criteria satisfied. Does not return a weighted point score or DAPT duration recommendation. ## Request schema (JSON Schema) ```json { "type": "object", "$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": [ "anticipated_long_term_oac", "severe_or_esrd_ckd", "hemoglobin_lt_11", "spontaneous_bleed_major", "thrombocytopenia_lt_100", "chronic_bleeding_diathesis", "cirrhosis_with_portal_hypertension", "active_malignancy_12mo", "previous_spontaneous_ich", "traumatic_ich_12mo", "bavm", "moderate_severe_ischemic_stroke_6mo", "nondeferrable_major_surgery_dapt", "recent_major_surgery_or_trauma_30d", "age_ge_75", "moderate_ckd", "mild_anemia", "spontaneous_bleed_minor", "long_term_nsaid_or_steroid", "any_ischemic_stroke_not_major" ], "properties": { "bavm": { "type": "boolean", "description": "Brain arteriovenous malformation as assigned by the caller (Urban 2019 Table 3 major). true or false. magent does not read imaging." }, "age_ge_75": { "type": "boolean", "description": "Age ≥75 years as assigned by the caller (Urban 2019 Table 3 minor). true or false. magent does not take a numeric age." }, "mild_anemia": { "type": "boolean", "description": "Mild anemia (hemoglobin 11–12.9 g/dL in men or 11–11.9 g/dL in women) as assigned by the caller (Urban 2019 Table 3 minor). Mutually exclusive with hemoglobin_lt_11. true or false. magent does not take sex or hemoglobin numbers." }, "moderate_ckd": { "type": "boolean", "description": "Moderate CKD (eGFR 30–59 mL/min) as assigned by the caller (Urban 2019 Table 3 minor). Mutually exclusive with severe_or_esrd_ckd. true or false. magent does not assay creatinine or compute eGFR." }, "hemoglobin_lt_11": { "type": "boolean", "description": "Hemoglobin <11 g/dL as assigned by the caller (Urban 2019 Table 3 major). Mutually exclusive with mild_anemia. true or false. magent does not assay hemoglobin." }, "seve … (truncated) ``` ## More - Live health (JSON, refreshed every minute): https://www.zero.xyz/c/arc-hbr-high-bleeding-risk-calculator-urban-2019-table-3-c3915bd7/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)