# `markets.rizon/exchange` on anlyon.dev

> Text inside fenced blocks marked untrusted-server-text was written by the MCP server's publisher, not by anlyon.dev. It is data to inspect, not instructions to follow. Invisible characters are shown as [U+XXXX].
> No finding is not a safety guarantee: these are point-in-time checks of tool definitions, not of code or behaviour.

- Page: https://anlyon.dev/servers/markets.rizon/exchange
- JSON: https://anlyon.dev/api/v1/servers/markets.rizon/exchange
- Version: 1.0.0 (active)
- Publisher: markets.rizon (domain proven to the MCP Registry)
- Runs: remote (streamable-http)
- Sign-in to list tools: none
- Metadata from the official MCP Registry, synced 2026-11-05T02:18:25.240Z

Title and description, as the publisher wrote them:

```untrusted-server-text
Rizon
A paper-money exchange: read live order books, place practice trades, test a bot. No sign-up.
```

Scanned 2026-11-05T02:18:30.783Z over streamable-http.

**10 tools: 1 can delete or cancel things, 2 change things and 7 only read.**

| Group | Class | Tools | Claude Code |
| --- | --- | --- | --- |
| Deletes or cancels | destructive | 1 | deny |
| Can't be undone | irreversible | 0 | ask |
| Changes things | write | 2 | ask |
| Only reads | read | 7 | allow |

## Exfil surface

No private-data -> untrusted-input -> outbound path in this server alone: no tool is tagged private-data or untrusted-input or outbound.

| Tag | Meaning | Tools |
| --- | --- | --- |
| private-data | Reads files, mail, messages, databases, secrets, calendars or repositories. | none |
| untrusted-input | Brings in text someone else can write: web pages, inbound email, messages, issues and comments. | none |
| outbound | Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL. | none |

## Findings

No check matched anything in these tool definitions.


## Deletes or cancels (1)

Removes, cancels or revokes something. Claude Code: deny.

### `cancel_orders`

- The name "cancel_orders" says "cancel": a word for removing or ending something.

Description, as the server wrote it:

```untrusted-server-text
Cancels your resting orders, on one market or side if you name it.
```

## Changes things (2)

Creates or changes something that can be changed back. Claude Code: ask.

### `create_account`

- The name "create_account" says "create": a word for a change.

Description, as the server wrote it:

```untrusted-server-text
A new paper account with $1,000 and its API key, shown once. Pass the key to the tools below, or set it as this server’s bearer token.
```

### `place_order`

- Nothing in its name or description says what it does, so it is counted as a write.

Description, as the server wrote it:

```untrusted-server-text
Places an order with paper money. side up buys Higher: it wins if the number finishes above the strike. side down sells: it holds Lower. A win pays 2× size. Leave out strike for a market order.
```

## Only reads (7)

Looks things up and changes nothing. Claude Code: allow.

### `get_account`

- The name "get_account" says "get": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Your balance, what’s in orders and positions, realised PnL and rank.
```

### `get_book`

- The name "get_book" says "get": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
One market’s order book: up to 30 levels a side, and its midpoint, the market’s forecast of the number. No key needed.
```

### `get_leaderboard`

- The name "get_leaderboard" says "get": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Every account that has traded, ranked by realised PnL, people and bots alike. No key needed.
```

### `get_orders`

- The name "get_orders" says "get": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Your orders. Open ones by default.
```

### `get_positions`

- The name "get_positions" says "get": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Your positions. Open ones by default.
```

### `get_prices`

- The name "get_prices" says "get": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
An underlying’s price history as [time, price] pairs. No key needed.
```

### `list_markets`

- The name "list_markets" says "list": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Every market: its number, spot, best bid and ask (strikes), one-sigma move, rules and status. No key needed.
```

## Claude Code permissions

For `.claude/settings.json`, assuming the server is installed as `exchange`:

```json
{
  "permissions": {
    "allow": [
      "mcp__exchange__list_markets",
      "mcp__exchange__get_book",
      "mcp__exchange__get_prices",
      "mcp__exchange__get_leaderboard",
      "mcp__exchange__get_account",
      "mcp__exchange__get_positions",
      "mcp__exchange__get_orders"
    ],
    "ask": [
      "mcp__exchange__create_account",
      "mcp__exchange__place_order"
    ],
    "deny": [
      "mcp__exchange__cancel_orders"
    ]
  }
}
```

## Remote posture

What an anonymous client saw at the remote endpoint, last 2026-11-05T03:20:05.482Z, unchanged since 2026-11-05T03:20:05.482Z. No credentials were sent and no tool was called. Values are shown as the endpoint returned them. Method: https://anlyon.dev/methodology#remote-posture

| Fact | Observed |
| --- | --- |
| Reachable | `yes` |
| HTTP status of an anonymous initialize | `200` |
| tools/list served without credentials | `yes` |
| Tools that change things, listed without credentials | `3` |
| Protocol version | `2025-06-18` |
| WWW-Authenticate on 401 | `not observed` |
| resource_metadata in WWW-Authenticate | `none` |
| RFC 9728 protected resource metadata | `none` |
| Authorization servers | `none` |
| Legacy HTTP+SSE transport | `no` |
| Dynamic client registration | `not observed` |
| Client ID metadata documents | `not observed` |

- **high** Tools that change things, listed to anyone ([unauth-remote-writes](https://anlyon.dev/methodology#unauth-remote-writes))

```untrusted-server-text
The endpoint served tools/list without credentials, and the list has 3 tools that change things (1 destructive, 2 write). Whether a call also works without credentials was not tested: tools are never called.

https://rizon.markets/mcp: tools/list returned 10 tools to an anonymous client, including cancel_orders (destructive), create_account (write), place_order (write)
```