Endpoints

Four endpoints. Every response carries an as_of date and at least one citation.

Base URL: https://api.lexcel.ai/v1. Bearer token in the Authorization header.

POST /v1/ask

Ask a natural-language question, get a cited answer scoped to one jurisdiction.

Request

{
  "question": "Can a Delaware LLC waive fiduciary duties in its operating agreement?",
  "jurisdiction": "DE",
  "as_of": "2025-08-01"
}

Field	Type	Required	Notes
`question`	string	yes	Plain English. No length limit but shorter questions get faster answers.
`jurisdiction`	string	yes	Two-letter code (`DE`, `NY`, `CA`, `DC`). See Coverage.
`as_of`	string	no	ISO date. Defaults to today.

Response

{
  "answer": "Yes. Delaware permits an LLC operating agreement to expand, restrict, or eliminate the duties (including fiduciary duties) of members and managers, provided the implied contractual covenant of good faith and fair dealing is preserved.",
  "citations": [
    {
      "code": "6 Del. C. § 18-1101(c)",
      "section_number": "18-1101(c)",
      "section_title": "Construction and application of chapter and limited liability company agreement",
      "quote": "the member's or manager's or other person's duties may be expanded or restricted or eliminated by provisions in the limited liability company agreement",
      "effective_as_of": "2025-08-01",
      "status": "CURRENT"
    }
  ],
  "jurisdiction": "DE",
  "confidence": "high"
}

GET /v1/statute/{citation}

Retrieve a specific section’s canonical text, effective date, version history, and cross-references.

Request

GET /v1/statute/6%20Del.%20C.%20%C2%A7%2018-1101(c)

Pass any recognizable citation. URL-encode the whole citation string.

Response

{
  "code": "6 Del. C. § 18-1101(c)",
  "section_number": "18-1101(c)",
  "section_title": "Construction and application of chapter and limited liability company agreement",
  "text": "...",
  "history": "Enacted 1992. Amended 2004, 2013, 2018.",
  "cross_references": ["6 Del. C. § 18-1104"],
  "effective_as_of": "2025-08-01",
  "status": "CURRENT",
  "jurisdiction": "DE"
}

POST /v1/compare

Same question, multiple jurisdictions, one call.

Request

{
  "question": "May an LLC operating agreement eliminate fiduciary duties?",
  "jurisdictions": ["DE", "NY", "CA", "TX"]
}

Response

{
  "results": [
    { "jurisdiction": "DE", "answer": "Yes...", "citations": [...] },
    { "jurisdiction": "NY", "answer": "No, but they may be modified...", "citations": [...] },
    { "jurisdiction": "CA", "answer": "Only in limited circumstances...", "citations": [...] },
    { "jurisdiction": "TX", "answer": "Yes...", "citations": [...] }
  ]
}

POST /v1/verify

Pass a legal assertion and a jurisdiction, get back whether the statute supports it and where.

Request

{
  "assertion": "Delaware allows an LLC operating agreement to eliminate the duty of loyalty.",
  "jurisdiction": "DE"
}

Response

{
  "verdict": "SUPPORTED",
  "explanation": "Section 18-1101(c) permits duties, including fiduciary duties, to be expanded, restricted, or eliminated by the operating agreement.",
  "citations": [
    {
      "code": "6 Del. C. § 18-1101(c)",
      "quote": "...",
      "effective_as_of": "2025-08-01",
      "status": "CURRENT"
    }
  ]
}

verdict is one of SUPPORTED, CONTRADICTED, NO_MATCH.

Errors

Status	Meaning
`400`	Malformed request (missing jurisdiction, unknown code)
`401`	Missing or invalid API key
`403`	Key revoked or expired
`422`	Jurisdiction not supported (see Coverage)
`429`	Rate limit exceeded — retry after the `Retry-After` header
`503`	Temporarily unavailable — retry after `Retry-After`

Error bodies are JSON: { "detail": "..." }.