CrossFin — x402 Agent Services Gateway (Korean Crypto Markets)

[bubilife1202]

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:

1. Korean market APIs — 35 paid endpoints covering 5 exchanges (Bithumb, Upbit, Coinone, GoPax, Binance), kimchi premium, stock analysis, ETF, routing engine, 4 bundle APIs
2. Service registry — 184 verified x402 services with search, categories, and proxy access
3. Agent tooling — MCP server (16 tools), agent guide API, OpenAPI spec, discovery endpoint
4. 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-mcp

Tools: 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/status

Links

• x402 ecosystem PR: https://github.com/coinbase/x402/pull/1187
• MCP Server (npm): https://www.npmjs.com/package/crossfin-mcp
• awesome-x402: Listed via https://github.com/xpaysh/awesome-x402 (commit 4bf7a1f)