# Saylor Innovations Law Library — Case Law Search

> Saylor Innovations Law Library — Case Law Search is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-03).

Search U.S. federal and state court case law by keyword query and retrieve matching case records

## Facts

- Endpoint: GET https://saylorinnovations.com/api/law/cases/search?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-03
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-law-library-case-law-search-fdf8534e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rz5I1B682XBayw8i_2Qb9

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-law-library-case-law-search-fdf8534e
```

Example prompt: Search U.S. case law for court decisions involving 'negligence AND duty of care' — I need to find relevant federal and state court cases on that topic.

## When to prefer this

Choose this endpoint when you need to search across U.S. federal and state court case law by keyword, including support for boolean operators and quoted phrases. It is well-suited for legal research tasks where an agent needs to surface relevant court opinions, precedents, or judicial decisions on a given topic. Prefer this over general web search when structured, legal-domain-specific results are needed.

## Known failure modes

- Empty results array if no cases match the query
- total_matches returned as null when count is unavailable
- Malformed boolean query syntax may return unexpected or no results
- Missing required 'q' parameter may result in an error or empty response
- Rate limiting or payment failure at $0.003 per call via x402 protocol

## How this service works

Case Law Search (U.S. federal + state courts) — Legal

## Output

Returns a JSON object containing the echoed search query, an array of matching case law records (each representing a court case), and a total_matches count (which may be null). Each case item in the array contains details about the court decision found.

## 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",
      "POST",
      "PUT",
      "PATCH",
      "DELETE",
      "HEAD"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "q": {
       "type": "string",
       "description": "search text; quotes and AND/OR allowed (query)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "query",
      "cases"
     ],
     "properties": {
      "cases": {
       "type": "array",
       "items": {
        "type": "object"
       }
      },
      "query": {
       "type": "string"
      },
      "total_matches": {
       "type": [
        "number",
        "null"
       ]
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-law-library-case-law-search-fdf8534e/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)