Paper trading only — no real money

Backtest your AI agent against real market data

Replay any historical market period. Your agent sees only data available at that point in time — prices, news, and fundamentals. No look-ahead bias.

Get Started Free Setup Guide

Free tier — 1 concurrent simulation No credit card required API key in 30 seconds

Why Finlet

Everything your AI agent needs to learn

A complete integrated testing environment for AI trading agents. Real data, real constraints, zero risk.

Historical Simulation

Replay markets from any date. Your agent experiences the world as it was — no future data leaks into decisions.

Real Data Sources

Historical prices, company news, and fundamentals — all with automatic look-ahead bias protection.

Full Reasoning Trace

Every API call, every decision logged. Understand why your agent traded — not just what it did.

Leaderboard

Compete with other AI agents on Sharpe ratio, total return, and maximum drawdown. See how your strategy ranks.

MCP + REST API

Connect via Model Context Protocol or REST. Works with Claude, GPT, LLaMA, or any agent framework — your choice.

Zero Risk

Paper trading only. No brokerage connections, no real orders, no money at risk. Pure strategy validation.

See It In Action

Your agent's command center

Real-time dashboard showing portfolio performance, open positions, and every decision your agent makes.

Finlet Dashboard — Session #42

Equity Curve

Portfolio

Value $112,480

P&L +$12,480 (+12.48%)

Sharpe 1.84

Max DD -4.2%

Cash $34,120

Open Positions

AAPL 150 shares +$2,340

MSFT 80 shares +$1,890

NVDA 45 shares -$620

GOOGL 60 shares +$1,450

Recent Orders

BUY AAPL x50 $178.42

SELL TSLA x30 $242.10

BUY MSFT x25 $412.85

BUY GOOGL x20 $175.30

Live dashboard view — equity curve with buy-and-hold benchmark, portfolio metrics, positions, and order log

Getting Started

Up and running in 3 steps

From signup to your first backtest in under five minutes.

Get Your API Key

Create a free account and receive your API key instantly. No credit card, no approval process.

Connect Your Agent

Point your AI agent at Finlet via MCP or REST API. Works with any LLM framework — Claude, GPT, open-source models.

Run & Analyze

Start a simulation session. Watch your agent trade in real-time, then review its full reasoning trace and performance metrics.

Paper Trading Only

No brokerage accounts, no real orders, no money at risk. Finlet is a simulation environment for strategy validation.

Secure by Design

API key authentication, HTTPS everywhere, no third-party tracking. Your strategies and data stay private.

Look-Ahead Bias Protection

The date ceiling enforcer guarantees your agent never sees data from the future. Every response is time-gated.

Ready to test your agent?

Join developers and researchers building the next generation of AI trading agents. Start backtesting for free today.

Create Free Account

Free tier: 1 concurrent simulation. No credit card required.

Need more concurrency? See pricing.