The only way AI agents access Asian crypto markets. CrossFin is a financial router for AI agents. It finds the cheapest path to move money across 14 exchanges (Bithumb, Upbit, Coinone, GoPax, bitFlyer, WazirX, bitbank, Indodax, Bitkub, Binance, OKX, Bybit, KuCoin, Coinbase), pays for APIs with crypto (x402 protocol), and gives agents real-time access to market data that's normally locked behind Ko
Add this skill
npx mdskills install bubilife1202/crossfinComprehensive MCP server for Asian crypto market access with routing engine and 16 well-documented tools
The only way AI agents access Asian crypto markets.
CrossFin is a financial router for AI agents. It finds the cheapest path to move money across 14 exchanges (Bithumb, Upbit, Coinone, GoPax, bitFlyer, WazirX, bitbank, Indodax, Bitkub, Binance, OKX, Bybit, KuCoin, Coinbase), pays for APIs with crypto (x402 protocol), and gives agents real-time access to market data that's normally locked behind Korean-language interfaces and IP restrictions.
Live: crossfin.dev | Demo: live.crossfin.dev
Add this to your MCP client config:
{
"mcpServers": {
"crossfin": {
"command": "npx",
"args": ["-y", "crossfin-mcp"],
"env": {
"EVM_PRIVATE_KEY": "0x..."
}
}
}
}
Restart your MCP client. Done. 16 tools available immediately.
All API endpoints are currently free during open beta. No API key required. EVM wallet is optional (needed for x402 payment flow testing).
Ask your agent:
For developers/agents:
find_optimal_route — cheapest/fastest/balanced path across Bithumb, Upbit, Coinone, GoPax, bitFlyer, WazirX, bitbank, Indodax, Bitkub, Binance, OKX, Bybit, KuCoin, Coinbase using 13 bridge coins (BTC, ETH, XRP, SOL, DOGE, ADA, DOT, LINK, AVAX, TRX, KAIA, SUI, APT)get_kimchi_premium — real-time Korean vs. global route spreadcompare_exchange_prices — live Bithumb KRW vs Binance USD price comparisoncall_paid_service — call any paid API with automatic x402 USDC payment (currently free during open beta)Korean exchanges are a walled garden. Korean-language APIs, IP restrictions, real-name bank account requirements (실명확인 계좌제), and no English documentation. AI agents can't access them — unless they go through CrossFin.
Prices differ across exchanges. The same BTC can be 2-3% more expensive on Korean exchanges (route spread). CrossFin's routing engine finds the cheapest bridge coin and path, factoring in trading fees, withdrawal fees, slippage, and transfer time.
x402 ready. No API keys, no subscriptions, no invoices. All endpoints are currently free during open beta. x402 payment infrastructure (USDC on Base) ready for future activation.
The core product. Given a source (exchange + currency) and destination, CrossFin evaluates all possible paths:
Input: bithumb:KRW → binance:USDC, ₩5,000,000
Output: Buy AVAX on Bithumb → Transfer to Binance → Sell for USDC
Cost: 0.07% (₩3,500) | Time: ~3 min | Output: $3,452 USDC
Alternatives:
BTC → 0.33% | ~21 min | $3,443
DOT → 0.38% | ~6 min | $3,441
Considers: trading fees (0.10–0.25%), withdrawal fees (fixed per coin), orderbook slippage, transfer time, route spread direction.
Supports bidirectional routing: Korea → Global and Global → Korea.
Free preview: POST /api/acp/quote (ACP compatible)
Full route: GET /api/premium/route/find (free during open beta)
| Tool | What it does |
|---|---|
find_optimal_route | Optimal crypto transfer path across 14 exchanges (free) |
list_exchange_fees | Trading + withdrawal fee comparison |
compare_exchange_prices | Live Bithumb KRW vs Binance USD comparison |
get_kimchi_premium | Korean vs. global route spread (free preview) |
search_services | Search registered services |
get_guide | Full agent guide (services, payment flow, examples) |
call_paid_service | Call any paid API with automatic x402 payment |
create_wallet | Local ledger wallet |
get_balance | Check wallet balance |
transfer | Transfer between wallets |
list_transactions | Transaction history |
set_budget | Daily spend limit |
list_services | Browse service catalog |
get_service | Service details |
list_categories | Service categories |
get_analytics | Gateway usage stats |
Real-time crypto premium analysis across 4 Asian countries. All free, no API key needed.
| Endpoint | Description |
|---|---|
GET /api/premium/asia/japan | Japan premium — bitbank.cc JPY vs Binance USD |
GET /api/premium/asia/indonesia | Indonesia premium — Indodax IDR vs Binance USD |
GET /api/premium/asia/thailand | Thailand premium — Bitkub THB vs Binance USD |
GET /api/premium/asia/overview | 4-country overview (Korea + Japan + Indonesia + Thailand) |
Data sources: bitbank.cc (Japan), Indodax (Indonesia), Bitkub (Thailand), Bithumb (Korea), Binance (Global)
All endpoints are currently free during open beta. x402 payment infrastructure is ready for future activation.
Korean Market APIs
| Endpoint | Price | Description |
|---|---|---|
/api/premium/arbitrage/kimchi | Free | Full Route Spread (13 pairs incl. KAIA, SUI, APT) |
/api/premium/arbitrage/opportunities | Free | Arbitrage indicators (POSITIVE_SPREAD/NEUTRAL/NEGATIVE_SPREAD) |
/api/premium/bithumb/orderbook?pair=BTC | Free | Bithumb orderbook (30 levels) |
/api/premium/market/upbit/ticker | Free | Upbit ticker |
/api/premium/market/upbit/orderbook | Free | Upbit orderbook |
/api/premium/market/coinone/ticker | Free | Coinone ticker |
/api/premium/market/fx/usdkrw | Free | USD/KRW exchange rate |
/api/premium/market/korea | Free | Korean market sentiment |
/api/premium/market/cross-exchange | Free | Cross-exchange arbitrage decision |
/api/premium/news/korea/headlines | Free | Korean headlines |
/api/premium/arbitrage/kimchi/history | Free | Route spread history (7 days) |
/api/premium/bithumb/volume-analysis | Free | Bithumb volume analysis |
/api/premium/market/upbit/signals | Free | Upbit trading signals |
/api/premium/crypto/korea/5exchange | Free | Cross-exchange price comparison |
/api/premium/crypto/korea/exchange-status | Free | Deposit/withdrawal status |
/api/premium/crypto/korea/fx-rate | Free | Real-time KRW/USD (Upbit CRIX) |
/api/premium/crypto/korea/upbit-candles | Free | Upbit OHLCV candles |
Bundle APIs
| Endpoint | Price | Description |
|---|---|---|
/api/premium/morning/brief | Free | Morning Brief (route spread + FX + headlines) |
/api/premium/crypto/snapshot | Free | Crypto Snapshot (4-exchange + route spread + volume + FX) |
/api/premium/kimchi/stats | Free | Route Spread Stats (spreads + trend + arbitrage signal) |
Utility APIs (Temporarily Free in Open Beta)
| Endpoint | Price | Description |
|---|---|---|
/api/premium/report | Free | Premium report (agents/wallets/transactions summary) |
/api/premium/enterprise | Free | Enterprise receipt/proof endpoint |
/api/legal/disclaimer | Free | Full legal disclaimer (EN/KO) |
/api/analytics/overview | Free | Gateway analytics overview |
/api/analytics/funnel/overview | Free | Funnel analytics overview |
/api/analytics/funnel/events | Free | Funnel analytics event ingestion |
/api/analytics/services/{serviceId} | Free | Per-service analytics |
/api/onchain/usdc-transfers | Free | On-chain USDC transfer monitor (Base) |
/api/proxy/{serviceId} | Free | Proxy endpoint for registered services |
/api/telegram/webhook | Free | Telegram bot webhook endpoint |
Protocol APIs (A2A + ACP)
| Endpoint | Price | Description |
|---|---|---|
POST /api/a2a/tasks | Free | A2A task execution (crypto-routing, route-spread, market data) |
GET /api/acp/status | Free | ACP protocol status and capabilities |
POST /api/acp/quote | Free | ACP-compatible routing quote (preview) |
POST /api/acp/execute | Free | ACP execution endpoint |
Routing Engine
| Endpoint | Price | Description |
|---|---|---|
GET /api/route/exchanges | Free | Supported exchanges and coins |
GET /api/route/fees | Free | Fee comparison table |
GET /api/route/pairs | Free | Trading pairs with live prices |
GET /api/route/status | Free | Exchange health check |
GET /api/premium/route/find | Free | Full optimal route analysis |
POST /api/acp/quote | Free | ACP-compatible routing quote (preview) |
Registry & Discovery (Free)
| Endpoint | Description |
|---|---|
GET /api/registry | List all registered services |
GET /api/registry/search?q=... | Full-text search |
GET /api/registry/categories | Categories with counts |
GET /api/registry/stats | Registry stats (total/crossfin/external) |
GET /api/docs/guide | Structured agent guide |
GET /.well-known/crossfin.json | Agent auto-discovery |
GET /.well-known/x402.json | x402 discovery metadata |
GET /.well-known/agent.json | A2A Agent Card |
GET /.well-known/ai-plugin.json | OpenAI plugin manifest |
GET /llms.txt | LLM-readable site map |
GET /api/openapi.json | OpenAPI 3.1 spec |
Note: All endpoints are currently free during open beta. The x402 payment code below is for reference when payments are re-enabled.
No API keys. No subscriptions. Pay per call with USDC on Base.
import { x402Client, wrapFetchWithPayment } from '@x402/fetch'
import { registerExactEvmScheme } from '@x402/evm/exact/client'
import { privateKeyToAccount } from 'viem/accounts'
const signer = privateKeyToAccount(process.env.EVM_PRIVATE_KEY)
const client = new x402Client()
registerExactEvmScheme(client, { signer })
const paidFetch = wrapFetchWithPayment(fetch, client)
const res = await paidFetch('https://crossfin.dev/api/premium/arbitrage/kimchi')
console.log(await res.json())
Python
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client
client = x402ClientSync()
account = Account.from_key(os.environ['EVM_PRIVATE_KEY'])
register_exact_evm_client(client, EthAccountSigner(account))
with x402_requests(client) as session:
r = session.get('https://crossfin.dev/api/premium/arbitrage/kimchi')
print(r.json())
Cloudflare Workers + Hono, D1 (SQLite), x402 protocol, USDC on Base, MCP SDK, React + Vite (dashboard)
apps/
api/ Cloudflare Workers API
mcp-server/ MCP Server (16 tools, npm: crossfin-mcp)
web/ Gateway Dashboard (crossfin.dev)
live/ Live Demo (live.crossfin.dev)
docs/ Documentation (docs.crossfin.dev)
Run a full pre-deploy verification sweep in one command:
npm --prefix apps/api run verify:release
This command runs API contract/catalog verification, builds API/web/docs in parallel, checks production API/page responses, and fails on stale copy patterns in README/docs/web/live/examples.
CrossFin was built entirely through AI collaboration by a non-developer in 1 week. Zero prior coding experience. This project is proof that AI agents can build production software — and CrossFin is the infrastructure for that future.
Install via CLI
npx mdskills install bubilife1202/crossfinCrossFin is a free, open-source AI agent skill. The only way AI agents access Asian crypto markets. CrossFin is a financial router for AI agents. It finds the cheapest path to move money across 14 exchanges (Bithumb, Upbit, Coinone, GoPax, bitFlyer, WazirX, bitbank, Indodax, Bitkub, Binance, OKX, Bybit, KuCoin, Coinbase), pays for APIs with crypto (x402 protocol), and gives agents real-time access to market data that's normally locked behind Ko
Install CrossFin with a single command:
npx mdskills install bubilife1202/crossfinThis downloads the skill files into your project and your AI agent picks them up automatically.
CrossFin works with Claude Code, Claude Desktop, Cursor, Vscode Copilot, Windsurf, Continue Dev, Codex, Gemini Cli, Amp, Roo Code, Goose, Opencode, Trae, Qodo, Command Code. Skills use the open SKILL.md format which is compatible with any AI coding agent that reads markdown instructions.