# Coronavirus Anxiety Scale CAS Status: LIVE Price: $0.005 USDC `GET /api/calc/cas` HTML: https://magentlab.com/docs/cas Markdown: https://magentlab.com/docs/cas.md Not a medical device. Not a diagnosis, dose, or listing recommendation. ## What it computes Sum five caller-assigned Lee 2020 Coronavirus Anxiety Scale integers (0-4) and return the published total (max 20) and ≥9 screen. ## When to use When an agent has already assigned Lee 2020 CAS 0-4 integers for each of the five items over the past two weeks and needs the published total and ≥9 screen, not a GAD-7 score, PHQ-9, or an anxiety diagnosis. magent does not interview the patient. ## When not to use - Not a medical device and not a diagnosis or treatment order. - dizzy, sleep, paralyzed, appetite, and nausea are caller-assigned integers 0-4 for the past two weeks (0 not at all, 1 rare less than a day or two, 2 several days, 3 more than 7 days, 4 nearly every day). magent does not interview the patient or interpret the items. - Lee 2020 published an optimized cut of ≥9 for probable dysfunctional coronavirus-related anxiety (90% sensitivity, 85% specificity in this paper). magent does not invent extra mild/moderate severity bands. screen_ge_9 is that published screen, not a diagnosis. - This is Lee 2020 CAS only (five items; max 20). The scale is public domain per the author; still cite Lee 2020. magent does not score GAD-7 or PHQ-9 here. ## Formula ``` CAS = dizzy + sleep + paralyzed + appetite + nausea; each caller-assigned 0-4 (Lee 2020 / DSM-5 cross-cutting: 0 not at all, 1 rare less than a day or two, 2 several days, 3 more than 7 days, 4 nearly every day); past two weeks; max 20; screen_ge_9 iff score ≥ 9 ``` ## Citation [Coronavirus Anxiety Scale: A brief mental health screener for COVID-19 related anxiety](https://doi.org/10.1080/07481187.2020.1748481) Lee SA Death Studies. 2020;44(7):393-401 DOI: [10.1080/07481187.2020.1748481](https://doi.org/10.1080/07481187.2020.1748481) ## Worked example ### All items 0 Given: `appetite=0, dizzy=0, nausea=0, paralyzed=0, sleep=0` 1. dizzy 0 + sleep 0 + paralyzed 0 + appetite 0 + nausea 0 2. Score = 0 (max 20); screen_ge_9 false ### Published ≥9 cut Given: `appetite=2, dizzy=2, nausea=1, paralyzed=2, sleep=2` 1. dizzy 2 + sleep 2 + paralyzed 2 + appetite 2 + nausea 1 2. Score = 9 (max 20); screen_ge_9 true (threshold is ≥9) ### All items 4 Given: `appetite=4, dizzy=4, nausea=4, paralyzed=4, sleep=4` 1. Score = 20 (max 20) 2. screen_ge_9 true ## Also searched as - Coronavirus Anxiety Scale - CAS - Lee 2020 CAS - COVID-19 related anxiety scale - coronavirus anxiety screener - five-item coronavirus anxiety - Lee CAS score ## Parameters - `dizzy` (integer, required): Caller-assigned Lee 2020 CAS item 1 (integer 0-4, past two weeks): I felt dizzy, lightheaded, or faint when I read or listened to news about the coronavirus (0 not at all, 1 rare less than a day or two, 2 several days, 3 more than 7 days, 4 nearly every day). magent does not interview the patient. - `sleep` (integer, required): Caller-assigned Lee 2020 CAS item 2 (integer 0-4, past two weeks): I had trouble falling or staying asleep because I was thinking about the coronavirus (0 not at all, 1 rare less than a day or two, 2 several days, 3 more than 7 days, 4 nearly every day). magent does not interview the patient. - `paralyzed` (integer, required): Caller-assigned Lee 2020 CAS item 3 (integer 0-4, past two weeks): I felt paralyzed or frozen when I thought about or was exposed to information about the coronavirus (0 not at all, 1 rare less than a day or two, 2 several days, 3 more than 7 days, 4 nearly every day). magent does not interview the patient. - `appetite` (integer, required): Caller-assigned Lee 2020 CAS item 4 (integer 0-4, past two weeks): I lost interest in eating when I thought about or was exposed to information about the coronavirus (0 not at all, 1 rare less than a day or two, 2 several days, 3 more than 7 days, 4 nearly every day). magent does not interview the patient. - `nausea` (integer, required): Caller-assigned Lee 2020 CAS item 5 (integer 0-4, past two weeks): I felt nauseous or had stomach problems when I thought about or was exposed to information about the coronavirus (0 not at all, 1 rare less than a day or two, 2 several days, 3 more than 7 days, 4 nearly every day). magent does not interview the patient. ## Bulk (POST) POST the same path with a JSON items array. The first item is the GET unit; each additional item is $0.002. Invalid items return HTTP 400 before settlement. Method: `POST /api/calc/cas` Max items: 25 Price: unit_amount + extra_item_amount * (n - 1) (unit 5000 atomic, extra 2000 atomic) Status: PREVIEW - 1 to 25 items. Each item uses the same keys as the GET query parameters. - POST of 1 item costs the same as GET. Lists longer than 25: chunk into multiple POSTs. Extra items still execute; do not pad dummy rows. - The first invalid item fails the whole request (index in the 400 JSON). You are not charged. - HTTP 200 is {count, path, items}. Each items[i] is the GET 200 body for that row. - Catalog misses (empty matches, found=false) stay paid 200s inside that slot. - x402 resource URL is this path plus n and body_sha256. Browsers that prefer text/html get the same paywall as GET; Pay retries POST with the same items. Example request: ```json { "items": [ { "appetite": "0", "dizzy": "0", "nausea": "0", "paralyzed": "0", "sleep": "0" }, { "appetite": "0", "dizzy": "0", "nausea": "0", "paralyzed": "0", "sleep": "0" } ] } ``` Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/cas Example 200: ```json { "count": 2, "path": "/api/calc/cas", "items": [ { "components": [ { "value": 0, "factor": "dizzy", "points": 0, "present": true }, { "value": 0, "factor": "sleep", "points": 0, "present": true }, { "value": 0, "factor": "paralyzed", "points": 0, "present": true }, { "value": 0, "factor": "appetite", "points": 0, "present": true }, { "value": 0, "factor": "nausea", "points": 0, "present": true } ], "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.", "citation": { "authors": "Lee SA", "doi": "10.1080/07481187.2020.1748481", "id": "lee-2020", "pmid": "32299304", "source": "Death Studies. 2020;44(7):393-401", "title": "Coronavirus Anxiety Scale: A brief mental health screener for COVID-19 related anxiety" }, "formula": "cas", "formula_expression": "CAS = dizzy + sleep + paralyzed + appetite + nausea; each caller-assigned 0-4 (Lee 2020 / DSM-5 cross-cutting: 0 not at all, 1 rare less than a day or two, 2 several days, 3 more than 7 days, 4 nearly every day); past two weeks; max 20; screen_ge_9 iff score ≥ 9", "max_score": 20, "score": 0, "screen_ge_9": false }, { "components": [ { "value": 0, "factor": "dizzy", "points": 0, "present": true }, { "value": 0, "factor": "sleep", "points": 0, "present": true }, { "value": 0, "factor": "paralyzed", "points": 0, "present": true }, { "value": 0, "factor": "appetite", "points": 0, "present": true }, { "value": 0, "factor": "nausea", "points": 0, "present": true } ], "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.", "citation": { "authors": "Lee SA", "doi": "10.1080/07481187.2020.1748481", "id": "lee-2020", "pmid": "32299304", "source": "Death Studies. 2020;44(7):393-401", "title": "Coronavirus Anxiety Scale: A brief mental health screener for COVID-19 related anxiety" }, "formula": "cas", "formula_expression": "CAS = dizzy + sleep + paralyzed + appetite + nausea; each caller-assigned 0-4 (Lee 2020 / DSM-5 cross-cutting: 0 not at all, 1 rare less than a day or two, 2 several days, 3 more than 7 days, 4 nearly every day); past two weeks; max 20; screen_ge_9 iff score ≥ 9", "max_score": 20, "score": 0, "screen_ge_9": false } ] } ``` ## Response fields - `formula` (string): cas - `formula_expression` (string): Exact expression used - `score` (integer): CAS points 0-20 - `max_score` (integer): 20 - `screen_ge_9` (boolean): true iff score ≥ 9 (Lee 2020 optimized cut: 90% sensitivity and 85% specificity for probable dysfunctional coronavirus-related anxiety). Not a diagnosis. No extra mild/moderate bands. - `components` (array): Per-item caller-assigned points - `citation` (object): Lee Death Studies 2020 citation - `disclaimer` (string): Not-a-device notice ## Example JSON Frozen fixture. Not a live lookup. ```json { "components": [ { "value": 0, "factor": "dizzy", "points": 0, "present": true }, { "value": 0, "factor": "sleep", "points": 0, "present": true }, { "value": 0, "factor": "paralyzed", "points": 0, "present": true }, { "value": 0, "factor": "appetite", "points": 0, "present": true }, { "value": 0, "factor": "nausea", "points": 0, "present": true } ], "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.", "citation": { "authors": "Lee SA", "doi": "10.1080/07481187.2020.1748481", "id": "lee-2020", "pmid": "32299304", "source": "Death Studies. 2020;44(7):393-401", "title": "Coronavirus Anxiety Scale: A brief mental health screener for COVID-19 related anxiety" }, "formula": "cas", "formula_expression": "CAS = dizzy + sleep + paralyzed + appetite + nausea; each caller-assigned 0-4 (Lee 2020 / DSM-5 cross-cutting: 0 not at all, 1 rare less than a day or two, 2 several days, 3 more than 7 days, 4 nearly every day); past two weeks; max 20; screen_ge_9 iff score ≥ 9", "max_score": 20, "score": 0, "screen_ge_9": false } ``` ## Errors - HTTP 400 `invalid_cas`: CAS needs the five Lee 2020 items as integers 0-4 (not at all through nearly every day). Returned before settlement; you are not charged. - HTTP 400 `invalid_items`: POST body must be a JSON object with only an items array Returned before settlement; you are not charged. - HTTP 400 `invalid_item_count`: items must be an array of 1 to 25 objects Returned before settlement; you are not charged. - HTTP 400 `invalid_item`: each items entry must be a JSON object Returned before settlement; you are not charged. Shared HTTP 402 and 503: https://magentlab.com/docs/payments ## Related tools - [PHQ-9](https://magentlab.com/docs/phq-9) — Sum nine caller-assigned Kroenke 2001 PHQ-9 integers (0-3) and return the published total (max 27), severity cutpoints, and ≥10 screen. - [GAD-7](https://magentlab.com/docs/gad-7) — Sum seven caller-assigned Spitzer 2006 GAD-7 integers (0-3) and return the published 0-21 total, 5/10/15 severity cuts, and ≥10 case-finding flag. ## Payment Unpaid requests return HTTP 402 even if query parameters or POST items are missing or invalid, so CDP and agents can index the path. After a PAYMENT-SIGNATURE, invalid params return HTTP 400 JSON before settlement. magent does not charge. Fix the params, then request a new 402 quote for that complete URL. Catalog misses (empty matches, found=false) are valid paid 200s. - GET the tool with Accept: application/json (do not send Accept: text/html unless you want the human paywall). - HTTP 402 means you have not paid. Decode the base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote. - Sign accepts[0] (exact, EIP-3009) with validBefore = now + maxTimeoutSeconds (600 seconds), or accepts[1] (batch-settlement deposit/voucher) on product GET. Ping and POST {items} stay exact. Magent retries transient facilitator 429/5xx before answering. - Retry the same URL with PAYMENT-SIGNATURE (base64 JSON of accepted and payload). Magent attaches canonical extensions.bazaar on CDP verify/settle; echoing 402 bazaar is optional. - Success is HTTP 200 JSON plus PAYMENT-RESPONSE. exact settles before the tool. batch-settlement verifies (and deposit-settles) before the tool and commits the charge after HTTP 2xx. HTTP 503: retry the same PAYMENT-SIGNATURE. Mint a new exact nonce only after a new HTTP 402. - offered `exact` on eip155:8453: Fixed-price USDC on Base. The buyer authorizes the advertised amount (EIP-3009). magent settles before the tool runs (paymentFlow upfront). extra.assetTransferMethod=eip3009 extra.paymentFlow=upfront. - offered `batch-settlement` on eip155:8453: Payment-channel vouchers claimed later in batches. Exact stays accepts[0]. Same-path POST {items} is still exact. extra.assetTransferMethod=eip3009 extra.paymentFlow=authorization. - not offered `upto`: Not offered. Usage-based: buyer authorizes a ceiling, seller settles the actual amount after work. Reserved for a future metered tool. Not for current calculators or code search. Same-path POST {items} is still scheme exact: one EIP-3009 authorization for GET unit plus $0.002 per extra item. That is not x402 batch-settlement (payment channels / vouchers). Shared HTTP 402 and 503 table: https://magentlab.com/docs/payments Stdio MCP (one process per host): https://magentlab.com/docs/mcp ## Guarantees - HTTP 402 is unpaid, including a missing query. After PAYMENT-SIGNATURE, invalid parameters return HTTP 400 before settlement. You are not charged. HTTP 402 never includes the tool JSON. - exact: settlement finishes before the tool (paymentFlow upfront). batch-settlement: verify/deposit before the tool; chargedCumulativeAmount commits after HTTP 2xx. Uncertain or failed settlement fails closed (HTTP 503). Retry the same PAYMENT-SIGNATURE. - HTTP 402 is unpaid only. Do not sign a second authorization because of a 503. - Execution is timeout-bounded and concurrency-capped. - Calculator inputs are stored encrypted for allowlisted operators (Magent Console). They are not in public logs, SSH lookups, catalog, or rollups. Request logs store path without query.