WEDGE

Ontology lookup

Exact code to preferred term. Deterministic catalog lookup. Not a billing submission.

WEDGE $0.005 USDC GET /api/ontology/lookup

When to use

Look up a current RxNorm, ICD-10-CM, or LOINC display from an exact code. Use when an agent already has a code and must not invent the preferred term.

Try

Opens the live endpoint. Unpaid browser requests show the paywall; agents should send Accept: application/json.

/api/ontology/lookup?system=rxnorm&code=198440

Full URL: https://api.magentlab.com/api/ontology/lookup?system=rxnorm&code=198440

Request

GET /api/ontology/lookup · x402 V2 · USDC on Base · $0.005 USDC

x402 V2 curl

Expect HTTP 402 and a PAYMENT-REQUIRED header until you retry with PAYMENT-SIGNATURE.

curl -i -H "Accept: application/json" "https://api.magentlab.com/api/ontology/lookup?system=rxnorm&code=198440"

Cursor mcp.json

Intended config for @magent/mcp. This is not npm @x402/fetch (a payment fetch wrapper).

{
  "mcpServers": {
    "magent": {
      "args": [
        "-y",
        "@magent/mcp"
      ],
      "command": "npx",
      "env": {
        "X402_PRIVATE_KEY": "0xYOUR_SPENDING_KEY"
      }
    }
  }
}

Query parameters

Success fields

Example

Frozen fixture. Not a live lookup.

{
  "code": "198440",
  "status": "current",
  "system": "rxnorm",
  "display": "acetaminophen 500 MG Oral Tablet",
  "tty": "SCD",
  "obsolete": false,
  "found": true,
  "disclaimer": "Not a medical device. Deterministic published-formula or coded-ontology output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
  "catalog": {
    "coverage": "full",
    "icd10cm_fy": "FY2026-04",
    "license": {
      "icd10cm": "ICD-10-CM from CMS/NCHS. US claims codes, not WHO ICD-10.",
      "loinc": "This material contains content from LOINC (http://loinc.org). LOINC is copyright © Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee and is available at no cost under the license at http://loinc.org/license. LOINC® is a registered United States trademark of Regenstrief Institute, Inc.",
      "rxnorm": "This product uses publicly available data courtesy of the U.S. National Library of Medicine (NLM), National Institutes of Health, Department of Health and Human Services; NLM is not responsible for the product and does not endorse or recommend this or any other product."
    },
    "loinc_version": "2.82",
    "notes": "ICD-10 entries are ICD-10-CM (US claims), not WHO ICD-10. RxNorm is Current Prescribable Content until a licensed full monthly ingest lands.",
    "rxnorm_release": "2026-08-03",
    "source": "postgres ingest",
    "systems": [
      "rxnorm",
      "icd10",
      "loinc"
    ],
    "version": "icd10:FY2026-04|loinc:2.82|rxnorm:2026-08-03"
  },
  "billable": null,
  "synonyms": [
    "acetaminophen 500 MG Oral Tablet",
    "APAP 500 MG Oral Tablet"
  ]
}

Payment

Unpaid requests return HTTP 402 with a base64 PAYMENT-REQUIRED header. Retry the same URL with PAYMENT-SIGNATURE. Settlement completes before the tool runs. Full handshake and shared payment errors: Payments.

Errors

Guarantees

• Settlement finishes before the tool executes. Uncertain settlement fails closed (HTTP 503).
• Lookups run on our nodes — no third-party data API wrappers.
• Localhost, IP literals, and metadata hostnames are rejected.
• Execution is timeout-bounded and concurrency-capped.