# Send Vynn Backtester to your agent
Hand the extracted package to your coding agent with a concrete install brief instead of figuring it out manually.
## Fast path
- Download the package from Yavira.
- Extract it into a folder your agent can access.
- Paste one of the prompts below and point your agent at the extracted folder.
## Suggested prompts
### New install

```text
I downloaded a skill package from Yavira. Read SKILL.md from the extracted folder and install it by following the included instructions. Tell me what you changed and call out any manual steps you could not complete.
```
### Upgrade existing

```text
I downloaded an updated skill package from Yavira. Read SKILL.md from the extracted folder, compare it with my current installation, and upgrade it while preserving any custom configuration unless the package docs explicitly say otherwise. Summarize what changed and any follow-up checks I should run.
```
## Machine-readable fields
```json
{
  "schemaVersion": "1.0",
  "item": {
    "slug": "vynn-backtester",
    "name": "Vynn Backtester",
    "source": "tencent",
    "type": "skill",
    "category": "开发工具",
    "sourceUrl": "https://clawhub.ai/beee003/vynn-backtester",
    "canonicalUrl": "https://clawhub.ai/beee003/vynn-backtester",
    "targetPlatform": "OpenClaw"
  },
  "install": {
    "downloadUrl": "/downloads/vynn-backtester",
    "sourceDownloadUrl": "https://wry-manatee-359.convex.site/api/v1/download?slug=vynn-backtester",
    "sourcePlatform": "tencent",
    "targetPlatform": "OpenClaw",
    "packageFormat": "ZIP package",
    "primaryDoc": "SKILL.md",
    "includedAssets": [
      "SKILL.md",
      "config.example.toml",
      "plugin.py"
    ],
    "downloadMode": "redirect",
    "sourceHealth": {
      "source": "tencent",
      "slug": "vynn-backtester",
      "status": "healthy",
      "reason": "direct_download_ok",
      "recommendedAction": "download",
      "checkedAt": "2026-05-10T19:31:15.716Z",
      "expiresAt": "2026-05-17T19:31:15.716Z",
      "httpStatus": 200,
      "finalUrl": "https://wry-manatee-359.convex.site/api/v1/download?slug=vynn-backtester",
      "contentType": "application/zip",
      "probeMethod": "head",
      "details": {
        "probeUrl": "https://wry-manatee-359.convex.site/api/v1/download?slug=vynn-backtester",
        "contentDisposition": "attachment; filename=\"vynn-backtester-1.0.0.zip\"",
        "redirectLocation": null,
        "bodySnippet": null,
        "slug": "vynn-backtester"
      },
      "scope": "item",
      "summary": "Item download looks usable.",
      "detail": "Yavira can redirect you to the upstream package for this item.",
      "primaryActionLabel": "Download for OpenClaw",
      "primaryActionHref": "/downloads/vynn-backtester"
    },
    "validation": {
      "installChecklist": [
        "Use the Yavira download entry.",
        "Review SKILL.md after the package is downloaded.",
        "Confirm the extracted package contains the expected setup assets."
      ],
      "postInstallChecks": [
        "Confirm the extracted package includes the expected docs or setup files.",
        "Validate the skill or prompts are available in your target agent workspace.",
        "Capture any manual follow-up steps the agent could not complete."
      ]
    }
  },
  "links": {
    "detailUrl": "https://openagent3.xyz/skills/vynn-backtester",
    "downloadUrl": "https://openagent3.xyz/downloads/vynn-backtester",
    "agentUrl": "https://openagent3.xyz/skills/vynn-backtester/agent",
    "manifestUrl": "https://openagent3.xyz/skills/vynn-backtester/agent.json",
    "briefUrl": "https://openagent3.xyz/skills/vynn-backtester/agent.md"
  }
}
```
## Documentation

### Vynn Backtester

Backtest any trading strategy with natural language. Get Sharpe ratio, returns, drawdown, and full equity curves in seconds.

### What it does

Natural language strategies: Describe your strategy in plain English and Vynn translates it into a runnable backtest
Structured strategies: Power users can pass precise entry/exit rules as JSON
Full metrics: Sharpe ratio, total return, max drawdown, win rate, trade count, and equity curve
Multi-ticker: Backtest across any combination of stocks, ETFs, or indices
Strategy comparison: Compare multiple strategies head-to-head, ranked by Sharpe ratio
No infrastructure: No local data downloads, no dependencies beyond Python stdlib

### Setup

Get a free API key at the-vynn.com (10 backtests/month, no credit card)
Set VYNN_API_KEY in your environment or skill config
Run /backtest "your strategy here" from any OpenClaw agent

### Quick start

# Sign up (instant, returns your API key)
curl -X POST https://the-vynn.com/v1/signup -H "Content-Type: application/json" -d '{"email": "you@example.com"}'

# Set the key
export VYNN_API_KEY="vynn_free_..."

### Simple natural language backtest

/backtest "RSI mean reversion on AAPL, 2 year lookback"

### Momentum strategy

/backtest "MACD crossover on SPY with 20/50 EMA filter"

### Multi-ticker portfolio

/backtest --tickers AAPL,MSFT,GOOGL --strategy "momentum top 3"

### Structured entry/exit rules

/backtest '{"entries": [{"indicator": "RSI", "op": "<", "value": 30}], "exits": [{"indicator": "RSI", "op": ">", "value": 70}]}' --tickers AAPL

### Compare strategies

from plugin import VynnBacktesterPlugin

vynn = VynnBacktesterPlugin()
results = vynn.compare(
    strategies=[
        "RSI mean reversion",
        "MACD crossover",
        "Bollinger band breakout",
    ],
    tickers=["SPY"],
)
for r in results:
    print(f"{r.strategy}: Sharpe={r.sharpe_ratio}, Return={r.total_return_pct}%")

### Environment Variables

VariableRequiredDescriptionDefaultVYNN_API_KEYYesYour API key from the-vynn.com--VYNN_BASE_URLNoOverride API base URL (for self-hosted instances)https://the-vynn.com/v1

### External Endpoints

EndpointPurposeData Senthttps://the-vynn.com/v1/backtestExecute a strategy backtestStrategy text, ticker list, lookback periodhttps://the-vynn.com/v1/signupFree API key registrationEmail address

### Security & Privacy

All requests authenticated via X-API-Key header
Strategy descriptions and ticker lists are sent to the Vynn API for backtest execution
No trading data, portfolio holdings, or personal information is stored beyond the backtest run
Backtest results are ephemeral and not persisted on Vynn servers
No credentials are stored by the skill -- only your API key in environment variables
Source code is fully open: github.com/beee003/astrai-openclaw

### Model Invocation

This skill does not invoke any LLM models. It sends strategy descriptions to the Vynn backtest engine, which is a quantitative execution engine (not an AI model). No prompts or completions are generated.

### Pricing

Free: 10 backtests/month, all features, no credit card required
Pro ($29/mo): Unlimited backtests, priority execution, extended lookback periods
## Trust
- Source: tencent
- Verification: Indexed source record
- Publisher: beee003
- Version: 1.0.0
## Source health
- Status: healthy
- Item download looks usable.
- Yavira can redirect you to the upstream package for this item.
- Health scope: item
- Reason: direct_download_ok
- Checked at: 2026-05-10T19:31:15.716Z
- Expires at: 2026-05-17T19:31:15.716Z
- Recommended action: Download for OpenClaw
## Links
- [Detail page](https://openagent3.xyz/skills/vynn-backtester)
- [Send to Agent page](https://openagent3.xyz/skills/vynn-backtester/agent)
- [JSON manifest](https://openagent3.xyz/skills/vynn-backtester/agent.json)
- [Markdown brief](https://openagent3.xyz/skills/vynn-backtester/agent.md)
- [Download page](https://openagent3.xyz/downloads/vynn-backtester)