# `ai.dripmetrics/mcp` 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/ai.dripmetrics/mcp
- JSON: https://anlyon.dev/api/v1/servers/ai.dripmetrics/mcp
- Version: 1.0.0 (active)
- Publisher: ai.dripmetrics (domain proven to the MCP Registry)
- Runs: remote (streamable-http)
- Sign-in to list tools: none
- Metadata from the official MCP Registry, synced 2026-10-21T17:41:40.226Z

Title and description, as the publisher wrote them:

```untrusted-server-text
DripMetrics
Crypto market microstructure, options, and on-chain metrics. Free discovery; $0.05/call via x402.
```

Scanned 2026-10-21T18:40:12.084Z over streamable-http.

**6 tools: 2 change things and 4 only read.**

| Group | Class | Tools | Claude Code |
| --- | --- | --- | --- |
| Deletes or cancels | destructive | 0 | deny |
| Can't be undone | irreversible | 0 | ask |
| Changes things | write | 2 | ask |
| Only reads | read | 4 | 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.


## Changes things (2)

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

### `compute_portfolio_var`

- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

Description, as the server wrote it:

```untrusted-server-text
Paid via x402 ($0.05 per request). Computes empirical and/or normal parametric VaR for a crypto portfolio. Provide either weights + portfolioValueUsd, or quantities. Invalid portfolios fail before payment.
```

### `compute_spread_greeks`

- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

Description, as the server wrote it:

```untrusted-server-text
Paid via x402 ($0.05 per request). Nets Black-76 greeks across up to 6 Deribit BTC option legs and returns a spot×vol scenario P&L grid. Invalid legs or unknown instruments fail before payment.
```

## Only reads (4)

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

### `describe_metric`

- The name "describe_metric" says "describe": a word for reading.

Description, as the server wrote it:

```untrusted-server-text
Free. Returns full details for one metric id from list_metrics: parameters, request/response schemas, price, and how to fetch it.
```

### `get_metric`

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

Description, as the server wrote it:

```untrusted-server-text
Paid via x402 (up to $0.25 per request; exact price per metric in list_metrics). Fetches any GET metric by id with query parameters. Without payment this returns the x402 challenge in _meta["x402/error"]; x402-capable clients (e.g. withX402Client) sign it and retry with _meta["x402/payment"] automatically. Invalid requests fail before payment.
```

### `get_payment_requirements`

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

Description, as the server wrote it:

```untrusted-server-text
Free. Dry-runs a metric request without payment and returns the exact x402 challenge the API issues (accepted networks, asset, amount, payTo). Invalid parameters fail here before any payment.
```

### `list_metrics`

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

Description, as the server wrote it:

```untrusted-server-text
Free. Lists every DripMetrics metric endpoint with its id, family, HTTP method, USD price, and summary. Use describe_metric for parameter details and get_metric (or the compute_* tools for POST endpoints) to fetch values. Paid fetches use x402 (USDC on Base); discovery is free.
```

## Claude Code permissions

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

```json
{
  "permissions": {
    "allow": [
      "mcp__dripmetrics__list_metrics",
      "mcp__dripmetrics__describe_metric",
      "mcp__dripmetrics__get_payment_requirements",
      "mcp__dripmetrics__get_metric"
    ],
    "ask": [
      "mcp__dripmetrics__compute_portfolio_var",
      "mcp__dripmetrics__compute_spread_greeks"
    ],
    "deny": []
  }
}
```

## Remote posture

What an anonymous client saw at the remote endpoint, last 2026-10-22T14:19:42.798Z, unchanged since 2026-10-22T14:19:42.798Z. 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 | `2` |
| 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` |

- **warn** 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 2 tools that change things (2 write). Whether a call also works without credentials was not tested: tools are never called.

https://mcp.dripmetrics.ai/mcp: tools/list returned 6 tools to an anonymous client, including compute_portfolio_var (write), compute_spread_greeks (write)
```