NEXUS LEGAL · DEVELOPER PLATFORM
Defensible legal analysis, one line of code.
63 jurisdictions · ISO 31000 certainty locks · Zero Retention EU · SLA 99.5–99.9% · Official SDKs on npm & PyPI
Citation verification (citation-fidelity checks) + jurisprudence + analysis · 63 jurisdictions · Zero-Retention
https://legal.nexusquantum.legal/api/mcpAvailable now as a custom connector — directory listing under review.
Install in 30 seconds
Full TypeScript types. Pythonic data classes. Zero runtime deps.
npm install @nexus-legal/sdkpip install nexus-legalimport { NexusClient } from "@nexus-legal/sdk";
const nexus = new NexusClient({
apiKey: process.env.NEXUS_API_KEY!,
});
const result = await nexus.analyze({
text: "Por el presente contrato, el arrendador cede el uso…",
jurisdiction: "ES",
legalBranch: "civil",
});
// Certainty locks: [L1] literal text · [L2-J] verified jurisprudence
// [L4] reasoned inference · [L5-C] critical risk
console.log(result.analysis.certaintyLocks);
// → ["[L2-J] Art. 1554 CC confirmed in CENDOJ #123456",
// "[L5-C] unilateral termination clause — high risk"][L1]Literal text match[L2-J]Verified jurisprudence (multi-jurisdiction)[L4]Reasoned inference[L5-C]Critical riskWHAT'S INCLUDED
Everything you need. Nothing you don't.
Bearer auth with tiers
Standard / Premium / Enterprise — 10 / 200 / 1,000 rpm. Auto-throttled; no silent drops. Rotate keys without downtime.
Idempotency-Key built-in
Retransmit without double-charging. Pass the same key on retry; get the same deterministic response from cache.
Batch up to 50 docs
Concurrency 1–10, credit pre-check before any processing starts. One auth round-trip, one response envelope.
Async jobs + HMAC webhooks
Don't block your UI. Fire a job, get a signed POST when it's done. Replay-safe retry schedule 1m → 5m → 30m → 2h → 12h, verifiable with your secret key.
Multi-tenancy
Master keys + revocable sub-keys, usage rollup per client. Built for distributors and legal SaaS with multi-firm deployments.
MCP server
14 legal tools inside Claude Desktop, Claude Code, and Cursor — no browser required. Published in the Anthropic MCP Registry as io.github.djtellado/nexus-legal. npx -y @nexus-legal/mcp and you're done.
Microsoft Word add-in
Sideload-ready taskpane that inserts Nexus analysis into drafts in place. Lawyers stay in Word while certainty locks land next to the clause they audit.
Statute corpus API
POST /api/v1/normativa/search for semantic search and POST /api/v1/normativa/verify-cita to verify any citation against the in-force corpus before signing. The normativa.updated webhook fires when a tracked law changes. Each jurisdiction's corpus activates under a Premium contract.
Citator API (Premium add-on)
Five REST endpoints — /validity · /citations · /cited-by · /timeline · /coverage — plus a new L2-J-V audit lock for validity-verified citations. Activates per contracted jurisdiction: 5 business days (Essentials) or 10 (Pro).
USE CASES
Built for the technical buyer
Automate contract review in your existing stack
Call /analyze from NetDocuments or iManage. ISO 31000 risk locks come back as structured JSON — no copy-paste, no context switch, no browser.
Embed legal intelligence without building the engine
Skip 8 months of jurisdiction research. Drop in the SDK, point it at your users' documents, surface certainty locks in your own UI — all in an afternoon.
White-label per client, full usage tracking
Issue a sub-key per client firm, set spend caps, receive usage rollup by key. Sell analysis under your brand with credit-back commitments in writing.
COMPLIANCE & COMMITMENTS
Contractual commitments. Not just marketing.
GDPR Art. 28 — Pre-signed DPA
14 sections, 8 documented sub-processors. Available at /legal/dpa. No negotiation round-trips — download, sign, done.
SLA with automatic credit-back
99.5% (Standard) / 99.9% (Enterprise). Breach triggers an automatic credit-back — no support ticket needed. Terms at /legal/sla.
Zero Retention by default
Documents processed in RAM in the Netherlands (Railway europe-west4). Never written to disk, never used to fine-tune any model.
PII Gatekeeper
ID numbers, IBANs, email addresses anonymised before any upstream LLM call. Audit log records every redaction with timestamp and field type.
Annual third-party audit committed in DPA §6
Report available to Enterprise customers under NDA. Proof that the commitments are real, not just stated.
OFFICIAL DISTRIBUTION
Installable from every major registry.
All packages open source (MIT / Apache 2.0). TypeScript SDK: zero runtime dependencies.
PARTNER MODEL
Multi-tenant and event-driven.
Build resellers, agencies or white-label integrations. The Organizations API lets you provision sub-keys, set credit limits per client and query usage by tenant. Webhooks deliver signed analysis-complete events so your downstream systems react instantly.
HMAC Webhooks
Signed POST callbacks on analysis-complete, job-failed and credit-low events. Replay-safe with X-Nexus-Signature-256 header verification.
/developers/webhooks ↗🏢Organizations API
Provision sub-keys per client, set credit limits, query per-tenant usage and rotate credentials programmatically. One master key — unlimited tenants.
/developers/organization ↗Start building in 2 minutes.
Generate a key and make your first API call. Scale when you're ready.
@nexus-legal/sdk v0.8.0 · nexus-legal v0.5.0 · @nexus-legal/mcp v0.1.2 · API v1.8.0