# Saylor Innovations MeSH Medical Term Lookup

> Saylor Innovations MeSH Medical Term Lookup is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-28).

Looks up medical terms in the NLM MeSH controlled vocabulary, returning descriptor IDs, preferred labels, synonyms, allowable qualifiers, and related headings

## Facts

- Endpoint: GET https://saylorinnovations.com/api/bio/mesh?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-mesh-medical-term-lookup-6ec07752
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cUfEjgadPXpyEHbQVr25o

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 saylor-innovations-mesh-medical-term-lookup-6ec07752
```

Example prompt: What is the official NLM MeSH descriptor ID and preferred label for 'myocardial infarction', and what synonyms and allowable qualifiers does it have? Return up to 5 matches.

## When to prefer this

Choose this endpoint when you need authoritative NLM MeSH-controlled vocabulary lookups for biomedical terms — ideal for indexing medical literature, standardizing clinical terminology, resolving synonyms to canonical descriptors, or finding allowable MeSH subheadings. Prefer this over general-purpose medical APIs when you specifically need MeSH descriptor IDs, qualifiers, and synonym entry terms from the official NLM vocabulary.

## Known failure modes

- Term not found in MeSH vocabulary — returns empty descriptors array and null top_match fields
- Invalid or missing 'q' query parameter — returns error response
- Limit parameter outside 1-25 range — may return default of 8 results or validation error
- Very general or ambiguous terms may return unrelated descriptors
- Non-English medical terms may not match MeSH entries which are primarily English

## How this service works

Look up medical terms in the NLM MeSH vocabulary - descriptor IDs, preferred label, entry-term synonyms, allowable qualifiers and related headings

## Output

Returns a JSON object with the interpreted query, data source attribution, total count, a top_match object (descriptor ID, preferred label, entry terms, allowable qualifiers, see-also links), and an array of additional matching MeSH descriptors each with ID, label, and a link to the MeSH browser.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "q"
     ],
     "properties": {
      "q": {
       "type": "string",
       "description": "Medical term to search"
      },
      "limit": {
       "type": "string",
       "description": "optional 1-25, default 8"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "query",
      "descriptors"
     ],
     "properties": {
      "count": {
       "type": "number",
       "description": "Number of items returned"
      },
      "query": {
       "type": "string",
       "description": "The query as the server interpreted it"
      },
      "source": {
       "type": "string",
       "description": "Data source the values come from"
      },
      "top_match": {
       "type": "object",
       "properties": {
        "id": {
         "type": [
          "string",
          "null"
         ],
         "description": "Identifier of the record"
        },
        "label": {
         "type": [
          "string",
          "null"
         ],
         "description": "Human-readable label"
        },
        "see_also": {
         "type": [
          "array",
          "null"
         ],
         "description": "See also"
        },
        "qualifiers": {
         "type": [
          "array",
          "null"
         ],
         "description": "Allowable qualifiers (subheadings) for the descriptor"
        },
        "entry_terms": {
         "type": [
          "array",
          "null"
         ],
         "description": "Entry terms"
        }
       },
       "description": "Top match"
      },
      "descriptors": {
       "type": "array",
       "description": "Matching MeSH descriptors with id, label and a link to the MeSH browser"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-mesh-medical-term-lookup-6ec07752/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)