CrossFin

Name: CrossFin
Author: bubilife1202

by bubilife1202version 1.18.0i★ –iComputer or cloud

Registry nameio.github.bubilife1202/crossfin

Install

Overview

Description from the maker (original English)

AI agent access to Asian crypto markets. Korean exchange routing and x402 paid APIs.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Computer or cloud
Transport: stdio, Streamable HTTP
Category: Other
You need to fill in: EVM_PRIVATE_KEY

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on the maker’s server: what you ask it goes through their server.
You fill in yourself: EVM_PRIVATE_KEY, CROSSFIN_API_URL, CROSSFIN_LEDGER_PATH

Values marked secret are keys to your account. Never share them or paste them into a chat.

You need

Runs in the cloudNothing to install; it connects over the internet
npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Works in Claude on the web, desktop and mobile:

Open Settings → Connectors
Press Add custom connector
Paste the address below and press Add
If it asks you to sign in, sign in with the maker

https://crossfin.dev/api/mcp

Or run it on your computer

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "crossfin": {
      "command": "npx",
      "args": [
        "-y",
        "crossfin-mcp"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "your-value",
        "CROSSFIN_API_URL": "your-value",
        "CROSSFIN_LEDGER_PATH": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add --transport http crossfin https://crossfin.dev/api/mcp

Or run it on your computer

claude mcp add crossfin --env EVM_PRIVATE_KEY=your-value --env CROSSFIN_API_URL=your-value --env CROSSFIN_LEDGER_PATH=your-value -- npx -y crossfin-mcp

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "crossfin": {
      "url": "https://crossfin.dev/api/mcp"
    }
  }
}

Or run it on your computer

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "crossfin": {
      "command": "npx",
      "args": [
        "-y",
        "crossfin-mcp"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "your-value",
        "CROSSFIN_API_URL": "your-value",
        "CROSSFIN_LEDGER_PATH": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "crossfin": {
      "type": "http",
      "url": "https://crossfin.dev/api/mcp"
    }
  }
}

Or run it on your computer

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "crossfin": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "crossfin-mcp"
      ],
      "env": {
        "EVM_PRIVATE_KEY": "your-value",
        "CROSSFIN_API_URL": "your-value",
        "CROSSFIN_LEDGER_PATH": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

ChatGPT connects only to servers on the internet:

Open ChatGPT on the web → Settings → Connectors (Apps)
Press Create or Add (some plans need Developer mode under Advanced first)
Paste the address below, give it a name and save
If it asks you to sign in, sign in with the maker

https://crossfin.dev/api/mcp

Menu names can differ slightly by plan and over time.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

EVM_PRIVATE_KEY secret env
Base wallet private key for x402 USDC payments (only needed for paid tools)
CROSSFIN_API_URL env
API base URL (default: https://crossfin.dev)
CROSSFIN_LEDGER_PATH env
Local ledger file path (default: ~/.crossfin/ledger.json)

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

We have not read this server’s tool list yet; we check endpoints in rotation.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account bubilife1202, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
… Not checked yet
Endpoint responds
Not checked yet; we check endpoints in rotation
… Not checked yet
Sign-in with OAuth
Not checked yet; we check endpoints in rotation
… Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint

Compared with others in Otheri

More stars than 0% of the other 32683 servers in this category
Published to the registry more recently than 3% of the other 32683 servers in this category
Basic checks equal to or better than 100% of the other 32683 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is CrossFin safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

You need to fill in: EVM_PRIVATE_KEY

Does it run on my computer or in the cloud?

Either way works: install it on your computer or connect to the cloud version.

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.18.0) reached the registry 8 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, MCP Server Autocad Lisp Helper

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

CrossFin MCP Server

Give your AI agent access to Asian crypto markets. 16 tools for real-time Korean exchange data, cross-exchange routing, and x402 paid API execution across 14 exchanges.

Quick Start

npx -y crossfin-mcp

That's it. Your agent now has 16 tools. Most tools work with no wallet setup, and payment-capable tools require EVM_PRIVATE_KEY.

Open beta note: CrossFin API endpoints are currently free, but payment-capable MCP tools still require wallet config for x402 flow compatibility.

Client Configuration

Claude Desktop

~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

"mcpServers": { "crossfin": { "command": "npx", "args": ["-y", "crossfin-mcp"], "env": { "EVM_PRIVATE_KEY": "0x..." } } } }

Cursor

.cursor/mcp.json in your project root:

"mcpServers": { "crossfin": { "command": "npx", "args": ["-y", "crossfin-mcp"], "env": { "EVM_PRIVATE_KEY": "0x..." } } } }

VS Code

.vscode/mcp.json in your project root (or user-level in settings):

"inputs": [ { "type": "promptString", "id": "evm-key", "description": "Base wallet private key for x402 payments (optional)", "password": true } ], "servers": { "crossfin": { "type": "stdio", "command": "npx", "args": ["-y", "crossfin-mcp"], "env": { "EVM_PRIVATE_KEY": "${input:evm-key}" } } } }

Windsurf

~/.codeium/windsurf/mcp_config.json:

"mcpServers": { "crossfin": { "command": "npx", "args": ["-y", "crossfin-mcp"], "env": { "EVM_PRIVATE_KEY": "0x..." } } } }

npx (standalone)

EVM_PRIVATE_KEY=0x... npx -y crossfin-mcp

No EVM key? Omit EVM_PRIVATE_KEY entirely. Free tools work without one.

All 16 Tools

Routing Engine

Tool	Price	Description
`find_optimal_route`	x402 flow	Optimal crypto transfer path across 14 exchanges with 13 bridge coins
`list_exchange_fees`	Free	Trading + withdrawal fee comparison for all exchanges
`compare_exchange_prices`	Free	Live Bithumb KRW vs Binance USD price comparison
`get_kimchi_premium`	Free	Korean vs. global route spread preview (top 3 pairs)

Paid API Gateway

Tool	Price	Description
`call_paid_service`	x402 flow	Call catalog premium endpoints with automatic x402 USDC payment

Service Registry

Tool	Price	Description
`search_services`	Free	Search registered services by keyword
`list_services`	Free	Browse the service catalog with category filter
`get_service`	Free	Get details for a specific service
`list_categories`	Free	List all service categories with counts
`get_guide`	Free	Full CrossFin agent guide (services, pricing, x402 flow)
`get_analytics`	Free	Gateway usage stats (total calls, top services)

Local Ledger

Tool	Price	Description
`create_wallet`	Free	Create a wallet in the local CrossFin ledger
`get_balance`	Free	Check wallet balance (KRW)
`transfer`	Free	Transfer funds between wallets
`list_transactions`	Free	Transaction history (optionally filtered by wallet)
`set_budget`	Free	Set a daily spend limit (KRW)

Sample Prompts

Korean

빗썸에서 바이낸스로 500만원 USDC 만들려면 가장 싼 방법이 뭐야?

지금 한국-글로벌 스프레드 얼마야?

거래소별 XRP 가격 비교해줘

오늘 한국 시장 브리핑해줘

English

What's the cheapest way to move 5M KRW from Bithumb to Binance as USDC?

Show me the current Korea-global crypto spread.

Compare XRP prices across exchanges.

Give me this morning's Korean market brief.

Supported Exchanges

Korea: Bithumb, Upbit, Coinone, GoPax Regional Fiat: bitFlyer, WazirX, bitbank, Indodax, Bitkub Global: Binance, OKX, Bybit, KuCoin, Coinbase

Bridge Coins

BTC, ETH, XRP, SOL, DOGE, ADA, DOT, LINK, AVAX, TRX, KAIA, SUI, APT

Environment Variables

Variable	Required	Description
`EVM_PRIVATE_KEY`	For paid tools	Base wallet private key for x402 USDC payments
`CROSSFIN_API_URL`	No	API base URL (default: `https://crossfin.dev`)
`CROSSFIN_LEDGER_PATH`	No	Local ledger file path (default: `~/.crossfin/ledger.json`)

x402 Payments

Paid tools use the x402 protocol for automatic micropayments. When your agent calls a paid endpoint:

The API responds with 402 Payment Required and a price header
The MCP server signs a USDC payment on Base (L2) using your EVM_PRIVATE_KEY
The payment is submitted and the API returns the data along with a transaction receipt

Payments settle on-chain. Each response includes txHash and a Basescan link for verification. Prices range from $0.01 to $0.20 per call.

To get started, fund a Base wallet with USDC and set EVM_PRIVATE_KEY. No account registration or API keys required.

Agent Discovery

CrossFin exposes standard discovery endpoints so agent frameworks can auto-detect capabilities:

Endpoint	Description
`/.well-known/ai-plugin.json`	OpenAI plugin manifest
`/.well-known/agent.json`	A2A Agent Card (Google Agent-to-Agent protocol)
`/.well-known/x402.json`	x402 payment discovery (network, token, payTo)
`/.well-known/crossfin.json`	CrossFin metadata (MCP, API, registry links)
`/llms.txt`	LLM-friendly service description

CrossFin

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Or run it on your computer

Or run it on your computer

Or run it on your computer

Or run it on your computer

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

MCP Server Autocad Lisp Helper

README from the maker

CrossFin MCP Server

Quick Start

Client Configuration

Claude Desktop

Cursor

VS Code

Windsurf

npx (standalone)

All 16 Tools

Routing Engine

Paid API Gateway

Service Registry

Local Ledger

Sample Prompts

Supported Exchanges

Bridge Coins

Environment Variables

x402 Payments

Agent Discovery

Links