CrossFin — x402 Agent Services Gateway (Korean Crypto Markets) #5
Description
CrossFin — x402 Agent Services Gateway
Live: https://crossfin.dev | Live Demo: https://live.crossfin.dev
GitHub: https://github.com/bubilife1202/crossfin
Overview
CrossFin is an x402-native gateway providing:
- Korean market APIs — 35 paid endpoints covering 5 exchanges (Bithumb, Upbit, Coinone, GoPax, Binance), kimchi premium, stock analysis, ETF, routing engine, 4 bundle APIs
- Service registry — 184 verified x402 services with search, categories, and proxy access
- Agent tooling — MCP server (16 tools), agent guide API, OpenAPI spec, discovery endpoint
- Routing engine — Find optimal crypto transfer routes across 5 exchanges using 11 bridge coins (incl. KAIA). Bidirectional Korea↔Global.
All paid endpoints use x402 payment (USDC on Base mainnet).
Paid Endpoints (x402) — 35 total
| Category | Examples | Price Range |
|---|---|---|
| Kimchi Premium | Full index (11 pairs incl. KAIA), arbitrage signals, history | $0.05–$0.10 |
| Exchange Data | Bithumb orderbook/volume, Upbit ticker/signals/candles, Coinone ticker | $0.02–$0.05 |
| Korean Stocks | KOSPI/KOSDAQ indices, momentum, investor flow, stock detail, themes, ETF | $0.03–$0.05 |
| Cross-Exchange | 5-exchange BTC comparison, FX rate | $0.01–$0.08 |
| Bundle APIs | Morning Brief, Crypto Snapshot, Kimchi Stats, Stock Brief | $0.10–$0.20 |
| Routing Engine | Optimal transfer route (5 exchanges × 11 bridge coins) | $0.10 |
Full list: https://crossfin.dev/api/docs/guide
Free Endpoints
| Endpoint | Description |
|---|---|
GET /api/arbitrage/demo |
Top 3 kimchi premium pairs (no auth) |
GET /api/registry/search?q=crypto |
Search 184 x402 services |
GET /api/registry/stats |
Registry counts (CrossFin 35 + External 149) |
GET /api/route/exchanges |
Supported exchanges and fees |
GET /api/route/pairs |
Live prices across exchanges |
GET /api/route/status |
Exchange API health check |
GET /api/docs/guide |
Agent onboarding guide (JSON) |
GET /api/openapi.json |
OpenAPI 3.1 spec |
MCP Server (16 tools)
npx -y crossfin-mcpTools: search_services, list_services, get_service, list_categories, get_kimchi_premium, get_analytics, get_guide, call_paid_service, find_optimal_route, list_exchange_fees, compare_exchange_prices, wallet management (5 tools).
Try it
# Free demo
curl https://crossfin.dev/api/arbitrage/demo
# Search x402 services
curl "https://crossfin.dev/api/registry/search?q=crypto"
# Exchange health
curl https://crossfin.dev/api/route/statusLinks
- x402 ecosystem PR: Add CrossFin to ecosystem directory coinbase/x402#1187
- MCP Server (npm): https://www.npmjs.com/package/crossfin-mcp
- awesome-x402: Listed via https://github.com/xpaysh/awesome-x402 (commit 4bf7a1f)