magent PHQ-9 Depression Severity Calculator

x402

magent PHQ-9 Depression Severity Calculator is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).

Computes the Kroenke 2001 PHQ-9 total score (0-27), severity band, and screen_ge_10 flag from nine caller-supplied DSM-IV symptom ratings (0-3 each).

Price / call$0.005

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StatusUnknown

How this service works

Kroenke 2001 PHQ-9 from nine caller-assigned DSM-IV depression items as integers 0-3 (0 not at all, 1 several days, 2 more than half the days, 3 nearly every day). magent does not interpret the items. Total 0-27. Severity: 0-4 none_minimal, 5-9 mild, 10-14 moderate, 15-19 moderately_severe, 20-27 severe. Returns screen_ge_10 (score ≥10; this paper 88% sensitivity and 88% specificity for major depression). Not a diagnosis, not a treatment order, not GAD-7, and not PHQ-2/PHQ-8.

Output

Returns a JSON object with: total PHQ-9 score (integer 0-27), severity string (none_minimal, mild, moderate, moderately_severe, or severe), screen_ge_10 boolean (true if score ≥10, with ~88% sensitivity and specificity for major depression per the citation), a per-item component breakdown showing each factor's value and points, the Kroenke 2001 academic citation (DOI, PMID, journal), the formula expression, and a disclaimer that this is not a medical device and a licensed clinician retains responsibility for patient care.

Example use cases

Telehealth intake depression screen

“A patient just completed a telehealth intake and rated their PHQ-9 symptoms as: anhedonia 2, depressed 2, sleep 3, energy 2, appetite 1, failure 1, concentration 2, psychomotor 1, self-harm 0. Can you calculate their PHQ-9 total and tell me the severity category and whether they screen positive?”

EHR clinical workflow automation

“I'm building an automated clinical notes assistant. Given these PHQ-9 item scores — anhedonia 1, depressed 1, sleep 0, energy 1, appetite 0, failure 0, concentration 1, psychomotor 0, self-harm 0 — compute the PHQ-9 total score, severity label, and the screen_ge_10 flag so I can populate the EHR record.”

Research data pipeline PHQ-9 batch prep

“For a study participant who rated themselves: anhedonia 3, depressed 3, sleep 3, energy 3, appetite 2, failure 2, concentration 2, psychomotor 2, self-harm 1 — what is their PHQ-9 score, severity classification, and does the screen_ge_10 flag come back true? Include the Kroenke 2001 citation in the output.”

Technical details

Endpoint

GEThttps://api.magentlab.com/api/calc/phq_9

When to prefer

Choose this endpoint when you need a deterministic, citable, machine-readable PHQ-9 score computation with severity banding and the screen_ge_10 flag for autonomous agent workflows, EHR integrations, or clinical documentation pipelines. It is not appropriate for GAD-7, PHQ-2, PHQ-8, or any other instrument. Prefer it over hand-coding PHQ-9 arithmetic when you need the full Kroenke 2001 citation, per-item component breakdown, and structured disclaimer in the response payload.

Side effects

Missing any of the nine required query parameters returns an error — all nine items (anhedonia, depressed, sleep, energy, appetite, failure, concentration, psychomotor, self_harm) must be supplied
Integer values outside 0-3 range may cause validation errors or unexpected results
Payment failure via x402 protocol will block the response (endpoint costs $0.005 USDC per call)
Passing non-integer (e.g. float or string) values for symptom items will likely cause a schema error

Input

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "path": "/api/calc/phq_9",
    "count": 2,
    "items": [
      {
        "score": 0,
        "formula": "phq_9",
        "citation": {
          "id": "kroenke-2001",
          "doi": "10.1046/j.1525-1497.2001.016009606.x",
          "pmid": "11556941",
          "title": "The PHQ-9: validity of a brief depression severity measure",
          "source": "J Gen Intern Med. 2001;16(9):606-613",
          "authors": "Kroenke K, Spitzer RL, Williams JBW"
        },
        "severity": "none_minimal",
        "max_score": 27,
        "components": [
          {
            "value": 0,
            "factor": "anhedonia",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "depressed",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "sleep",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "energy",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "appetite",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "failure",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "concentration",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "psychomotor",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "self_harm",
            "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.",
        "screen_ge_10": false,
        "formula_expression": "PHQ-9 = anhedonia + depressed + sleep + energy + appetite + failure + concentration + psychomotor + self_harm; each caller-assigned 0-3; max 27"
      },
      {
        "score": 0,
        "formula": "phq_9",
        "citation": {
          "id": "kroenke-2001",
          "doi": "10.1046/j.1525-1497.2001.016009606.x",
          "pmid": "11556941",
          "title": "The PHQ-9: validity of a brief depression severity measure",
          "source": "J Gen Intern Med. 2001;16(9):606-613",
          "authors": "Kroenke K, Spitzer RL, Williams JBW"
        },
        "severity": "none_minimal",
        "max_score": 27,
        "components": [
          {
            "value": 0,
            "factor": "anhedonia",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "depressed",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "sleep",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "energy",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "appetite",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "failure",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "concentration",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "psychomotor",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "self_harm",
            "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.",
        "screen_ge_10": false,
        "formula_expression": "PHQ-9 = anhedonia + depressed + sleep + energy + appetite + failure + concentration + psychomotor + self_harm; each caller-assigned 0-3; max 27"
      }
    ]
  }
}

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How this service works

Output

Example use cases

Telehealth intake depression screen

EHR clinical workflow automation

Research data pipeline PHQ-9 batch prep

Technical details

Endpoint

GEThttps://api.magentlab.com/api/calc/phq_9

When to prefer

Side effects

Missing any of the nine required query parameters returns an error — all nine items (anhedonia, depressed, sleep, energy, appetite, failure, concentration, psychomotor, self_harm) must be supplied
Integer values outside 0-3 range may cause validation errors or unexpected results
Payment failure via x402 protocol will block the response (endpoint costs $0.005 USDC per call)
Passing non-integer (e.g. float or string) values for symptom items will likely cause a schema error

Input

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "path": "/api/calc/phq_9",
    "count": 2,
    "items": [
      {
        "score": 0,
        "formula": "phq_9",
        "citation": {
          "id": "kroenke-2001",
          "doi": "10.1046/j.1525-1497.2001.016009606.x",
          "pmid": "11556941",
          "title": "The PHQ-9: validity of a brief depression severity measure",
          "source": "J Gen Intern Med. 2001;16(9):606-613",
          "authors": "Kroenke K, Spitzer RL, Williams JBW"
        },
        "severity": "none_minimal",
        "max_score": 27,
        "components": [
          {
            "value": 0,
            "factor": "anhedonia",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "depressed",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "sleep",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "energy",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "appetite",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "failure",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "concentration",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "psychomotor",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "self_harm",
            "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.",
        "screen_ge_10": false,
        "formula_expression": "PHQ-9 = anhedonia + depressed + sleep + energy + appetite + failure + concentration + psychomotor + self_harm; each caller-assigned 0-3; max 27"
      },
      {
        "score": 0,
        "formula": "phq_9",
        "citation": {
          "id": "kroenke-2001",
          "doi": "10.1046/j.1525-1497.2001.016009606.x",
          "pmid": "11556941",
          "title": "The PHQ-9: validity of a brief depression severity measure",
          "source": "J Gen Intern Med. 2001;16(9):606-613",
          "authors": "Kroenke K, Spitzer RL, Williams JBW"
        },
        "severity": "none_minimal",
        "max_score": 27,
        "components": [
          {
            "value": 0,
            "factor": "anhedonia",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "depressed",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "sleep",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "energy",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "appetite",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "failure",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "concentration",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "psychomotor",
            "points": 0,
            "present": true
          },
          {
            "value": 0,
            "factor": "self_harm",
            "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.",
        "screen_ge_10": false,
        "formula_expression": "PHQ-9 = anhedonia + depressed + sleep + energy + appetite + failure + concentration + psychomotor + self_harm; each caller-assigned 0-3; max 27"
      }
    ]
  }
}