The trust, audit & observability layer for AI agents
ProofLedger drops in beside any agent framework and records exactly what your agents did — in a tamper-evident, developer-friendly audit trail you can replay and verify.
See ProofLedger in 35 seconds — from drop-in SDK to a verifiable, tamper-evident audit trail.
import { ProofLedger } from "@proofledger/sdk";
ProofLedger.enable({ apiKey: process.env.PROOFLEDGER_API_KEY });
await ProofLedger.withRun(
{ agentId: "support-agent", model: "claude-4-opus", provider: "anthropic" },
async (run) => {
return await myAgent.run("Resolve ticket #4821");
}
);Drop it in. Every run is captured in a tamper-evident audit trail.
Everything you need to trust your agents
Observability, audit and replay — built for production AI from the first run.
Tamper-evident hash chains
SHA-256 canonical chains make every run cryptographically verifiable.
Full run traces & replay
Capture inputs, outputs, events and tool calls — then replay them step by step.
Step-by-step debugging
Pinpoint exactly where a run failed with focused, automated insights.
Cost & latency observability
Track spend, tokens and latency across agents, models and providers.
Run comparison & diffing
Diff prompts, outputs, models, tools, latency and cost between any two runs.
Framework-agnostic SDK
Drop-in TypeScript and Python SDKs that sit beside any agent stack.
How it works
Three steps from import to a verifiable audit trail.
Install the SDK
Add @proofledger/sdk and drop in ProofLedger.enable() — no rewrites required.
Your agents run as usual
Every run, event and tool call is captured automatically in the background.
Watch, replay & verify
Inspect every run, replay it step by step and prove the audit trail in the dashboard.
Simple pricing
Start free. Upgrade when you scale.
Pro
Popular$49 / month
- ✓100,000 runs / month
- ✓Unlimited projects
- ✓Team members
- ✓90-day retention
- ✓Email support
TypeScript & Python SDKs included on every plan.
Start capturing trustworthy AI in minutes
No rewrites, no lock-in. Drop in the SDK and watch every run become auditable.