Superseded. DCL Evaluator is the earlier DCL product, including its MCP endpoint (/sse, API key) and its offline desktop audit trail. Agents should use the hosted DCL Trust Oracle at https://mcp.fronesislabs.com/mcp. References below to /sse, API keys, dcl_commit, dcl_verify, dcl_get_chain, dcl_report, and fixed prices are historical.

DCL Evaluator

Cryptographic audit trail for AI agents. Powered by Leibniz Layer™

Every decision your AI agent makes — sealed, verified, auditable.

DCL Evaluator is the first implementation of Leibniz Layer™ — a cryptographic verification protocol for AI agent decisions. It brings deterministic, tamper-evident audit trails to any LLM-powered system.

Why DCL Evaluator

AI agents make decisions. Those decisions carry risk — legal, financial, reputational. Yet most AI systems are black boxes: no record of what was decided, why, or whether the decision was tampered with afterward.

DCL Evaluator solves this with a simple principle borrowed from cryptography: commit every decision into a hash chain. Modify any past record and the entire chain invalidates. Mathematical proof of integrity — no trust required.

Related MCP server: Agent Audit Trail MCP Server

Core capabilities

• SHA-256 hash chain — every agent action cryptographically sealed

• Merkle tree audit trail — tamper-evident by design

• Deterministic policy engine — identical input = identical decision, 100% reproducible

• Drift detection — statistical Z-test catches behavioural drift before it becomes a compliance failure

• Multi-LLM support — Claude, GPT-4, Grok, Gemini, DeepSeek, Ollama (local, air-gapped)

• MCP server — connect any agent in minutes via Model Context Protocol

• Compliance reports — tamper-evident PDF export, ready for regulators

• Offline-capable — runs fully air-gapped, zero data leaves your infrastructure

💳 Pay-per-Audit via x402

DCL Evaluator supports the x402 payment protocol.
AI agents can request audits autonomously — no API keys, just HTTP 402 + USDC on Base.

Endpoint: https://x402.fronesislabs.com
Network: Base Mainnet (eip155:8453)

Any agent that speaks HTTP can pay for and receive a cryptographic audit — no human required.

Connect via MCP

{
  "mcpServers": {
    "dcl-evaluator": {
      "url": "https://mcp.fronesislabs.com/sse",
      "headers": {
        "x-api-key": "your-key"
      }
    }
  }
}

Four tools available:

Health check: https://mcp.fronesislabs.com/health

Download

→ Latest release — v1.2.0

Desktop app (Windows). Wails + Go + React. Works offline.

Compliance coverage

Built-in policy templates:

DEFAULT · EU AI ACT · GDPR · FINANCE · MEDICAL · RED TEAM

Leibniz Layer™

DCL Evaluator is the first product implementing Leibniz Layer™ — the cryptographic verification layer for the AI agent economy.

Named after Gottfried Wilhelm Leibniz — mathematician, logician, pioneer of deterministic reasoning.

"Every decision, every action deterministically sealed, tamper-evident, auditable."

leibniz.fronesislabs.com

Links

• Website: fronesislabs.com

• Leibniz Layer™: leibniz.fronesislabs.com

• IP & Patents: leibniz.fronesislabs.com/ip-patents.html

• MCP endpoint: mcp.fronesislabs.com

• X: @keykeeper42

• White Paper: WHITEPAPER.md · leibniz.fronesislabs.com/whitepaper.html

© 2026 Fronesis Labs · Leibniz Layer™, DCL Evaluator™ — Patent Pending · Source-Available License