# preview_trade

Preview a buy or sell without executing.

Agent View of the PolicyLayer registry record for `preview_trade`. HTML page: https://policylayer.com/tools/launch-on-basis-mcp-ts/preview-trade

## Facts

- Tool: `preview_trade`
- Server: Basis MCP Server (`launch-on-basis/mcp-ts`) — https://policylayer.com/tools/launch-on-basis-mcp-ts.md
- Homepage: https://github.com/Launch-On-Basis/MCP-TS
- Risk category: Read (Low risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Allowed

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "preview_trade",
    "arguments": {}
  }
}
```

## Why preview_trade is rated Low

This tool retrieves information about a potential trade (price estimates, slippage calculations, etc.) but performs no actual transaction, fund transfer, or state modification. It is purely informational and matches the Read category definition of 'retrieves or queries data; no side effects.' Misuse by an AI agent would have minimal blast radius since no real assets are at risk.

From the tool's own definition: "Tool description explicitly states 'Preview a buy or sell without executing.' The word 'preview' combined with 'without executing' indicates this is a read-only operation that retrieves simulation or estimation data without side effects."

## Use case

AI agents call preview_trade to retrieve information from Basis MCP Server without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

## Recommended policy (PolicyLayer)

Verdict: **Allowed**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Basis MCP Server:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "preview_trade": {}
  }
}
```

## Other tools on Basis MCP Server (203)

- `cancel_order` — Destructive — https://policylayer.com/tools/launch-on-basis-mcp-ts/cancel-order.md
- `delete_project_comment` — Destructive — https://policylayer.com/tools/launch-on-basis-mcp-ts/delete-project-comment.md
- `delete_reef_comment` — Destructive — https://policylayer.com/tools/launch-on-basis-mcp-ts/delete-reef-comment.md
- `delete_reef_post` — Destructive — https://policylayer.com/tools/launch-on-basis-mcp-ts/delete-reef-post.md
- `pm_cancel_order` — Destructive — https://policylayer.com/tools/launch-on-basis-mcp-ts/pm-cancel-order.md
- `remove_dev_share` — Destructive — https://policylayer.com/tools/launch-on-basis-mcp-ts/remove-dev-share.md
- `unfreeze_token` — Destructive — https://policylayer.com/tools/launch-on-basis-mcp-ts/unfreeze-token.md
- `link_moltbook` — Execute — https://policylayer.com/tools/launch-on-basis-mcp-ts/link-moltbook.md
- `start_surge_tax` — Execute — https://policylayer.com/tools/launch-on-basis-mcp-ts/start-surge-tax.md
- `sync_order` — Execute — https://policylayer.com/tools/launch-on-basis-mcp-ts/sync-order.md
- `updown_cancel_stalled` — Execute — https://policylayer.com/tools/launch-on-basis-mcp-ts/updown-cancel-stalled.md
- `veto_outcome` — Execute — https://policylayer.com/tools/launch-on-basis-mcp-ts/veto-outcome.md
- `vote_on_dispute` — Execute — https://policylayer.com/tools/launch-on-basis-mcp-ts/vote-on-dispute.md
- `bet` — Financial — https://policylayer.com/tools/launch-on-basis-mcp-ts/bet.md
- `buy_multiple_orders` — Financial — https://policylayer.com/tools/launch-on-basis-mcp-ts/buy-multiple-orders.md
- `buy_order` — Financial — https://policylayer.com/tools/launch-on-basis-mcp-ts/buy-order.md
- `buy_orders_and_contract` — Financial — https://policylayer.com/tools/launch-on-basis-mcp-ts/buy-orders-and-contract.md
- `buy_token` — Financial — https://policylayer.com/tools/launch-on-basis-mcp-ts/buy-token.md
- `claim_bounty` — Financial — https://policylayer.com/tools/launch-on-basis-mcp-ts/claim-bounty.md
- `claim_faucet` — Financial — https://policylayer.com/tools/launch-on-basis-mcp-ts/claim-faucet.md
- `claim_leverage_liquidation` — Financial — https://policylayer.com/tools/launch-on-basis-mcp-ts/claim-leverage-liquidation.md
- `close_leverage` — Financial — https://policylayer.com/tools/launch-on-basis-mcp-ts/close-leverage.md
- `dispute_outcome` — Financial — https://policylayer.com/tools/launch-on-basis-mcp-ts/dispute-outcome.md
- `finalize_market` — Financial — https://policylayer.com/tools/launch-on-basis-mcp-ts/finalize-market.md
- `leverage_buy` — Financial — https://policylayer.com/tools/launch-on-basis-mcp-ts/leverage-buy.md
- `pm_buy` — Financial — https://policylayer.com/tools/launch-on-basis-mcp-ts/pm-buy.md
- `pm_buy_multiple_orders` — Financial — https://policylayer.com/tools/launch-on-basis-mcp-ts/pm-buy-multiple-orders.md
- `pm_buy_order` — Financial — https://policylayer.com/tools/launch-on-basis-mcp-ts/pm-buy-order.md
- `pm_buy_orders_and_contract` — Financial — https://policylayer.com/tools/launch-on-basis-mcp-ts/pm-buy-orders-and-contract.md
- `pm_finalize` — Financial — https://policylayer.com/tools/launch-on-basis-mcp-ts/pm-finalize.md
- …and 173 more: https://policylayer.com/tools/launch-on-basis-mcp-ts.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=launch-on-basis-mcp-ts · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/launch-on-basis-mcp-ts