# Marketcaper - cross market cap comparer

> Use this tool when you need to compare market capitalizations across different asset classes, such as crypto, stocks, and fiat currencies, to gain insight into relative valuations and hypothetical scenarios. Marketcaper provides a simple interface for inputting pair comparisons and returns structured JSON output, along with citation information and hosted images. It is ideal for AI assistants and automation tools that require accurate and attributed market data for analysis, reporting, or content creation.

Canonical page: https://skillsregistry.net/skills/marketcaper-market  
JSON: https://api.skillsregistry.net/v1/skills/marketcaper-market

## Description

Marketcaper lets AI clients compare crypto, stocks, fiat currencies, GDP, and billionaire net worth on one scale. It turns abstract market-cap differences into concrete what-if scenarios like “What price would BTC be at ETH’s market cap?” or “What price would NVDA be at Elon Musk’s net worth?”

Valid public Marketcaper pair pages are directly readable HTML, but the MCP endpoint is the official structured path for deterministic JSON, canonical source URLs, citation text, and hosted comparison images. That makes it useful for AI assistants, automation tools, and agent workflows that need both numbers and attribution.

The server is deliberately narrow and citation-first. It focuses on single-asset snapshots, pair comparisons, and ready-to-publish comparison packs rather than bulk extraction. For valid comparisons, clients can also request a hosted PNG image that works well for social posts, alerts, and content workflows.

## Trust

- **Trust score (0–1):** 0.50
- **Verification tier:** unverified

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** finance
- **Updated:** 2026-05-12

## Source

- **Source listing:** [Smithery](https://smithery.ai/server/marketcaper/market)

## Use it

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "marketcaper-market"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/marketcaper-market` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/marketcaper-market/pull`

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