Add CrossFin to ecosystem directory

[bubilife1202]

Add CrossFin to ecosystem directory

CrossFin is an x402 Agent Services Gateway for Korean financial and crypto market data. Live at https://crossfin.dev

What CrossFin provides

35 Paid Korean Market x402 Endpoints

Category	Endpoints	Price Range
Kimchi Premium & Arbitrage	4 endpoints (real-time index, history, opportunities, cross-exchange)	$0.05–$0.10
Exchange Data	6 endpoints (Bithumb/Upbit/Coinone orderbooks, tickers, volume, signals)	$0.02–$0.05
Korean Stock Market	8 endpoints (KOSPI/KOSDAQ indices, momentum, investor flow, stock detail, themes, disclosure, ETF)	$0.03–$0.05
FX & News	3 endpoints (USD/KRW, crypto FX rate, headlines)	$0.01–$0.03
Bundle APIs	4 endpoints (Morning Brief, Crypto Snapshot, Kimchi Stats, Stock Brief)	$0.10–$0.20
Routing Engine	1 paid + 4 free endpoints (optimal crypto transfer route across 6 exchanges)	$0.10
Global Indices	2 endpoints (chart data for Dow, NASDAQ, Hang Seng, Nikkei, etc.)	$0.02–$0.05
Crypto Candles	1 endpoint (Upbit OHLCV candles, 1m to monthly)	$0.02
5-Exchange Comparison	1 endpoint (compare prices across 5 Korean exchanges)	$0.08

All paid endpoints return HTTP 402 with x402 payment headers. Settlement: USDC on Base mainnet.

184 Verified x402 Service Registry

Endpoint	Description
GET /api/registry/search?q=crypto	Search 184 x402 services by keyword
GET /api/registry	List all services (filterable by category, provider)
GET /api/registry/categories	Categories with counts
GET /api/registry/stats	Total: 35 CrossFin + 149 external
GET /api/registry/{id}	Service detail with guide, inputSchema, outputExample
GET /api/proxy/{serviceId}	Forward to any registered service (5% proxy fee)

MCP Server — 16 tools

search_services, list_services, get_service, list_categories, get_kimchi_premium, get_analytics, get_guide, create_wallet, get_balance, transfer, list_transactions, set_budget, call_paid_service, find_optimal_route, list_exchange_fees, compare_exchange_prices

Agent Integration

• Agent guide: GET /api/docs/guide (structured JSON)
• Discovery: GET /.well-known/crossfin.json
• OpenAPI 3.1: GET /api/openapi.json
• ACP (Agentic Commerce Protocol): quote + execute endpoints

Try it now

# Free demo (no payment needed)
curl https://crossfin.dev/api/arbitrage/demo

# Search x402 services
curl https://crossfin.dev/api/registry/search?q=crypto

# Agent guide
curl https://crossfin.dev/api/docs/guide

Technical details

• Cloudflare Workers + Hono
• x402 payment via @x402/hono middleware
• Base mainnet (eip155:8453), USDC
• MCP server: npx -y crossfin-mcp

Links

• Live: https://crossfin.dev
• Live Demo: https://live.crossfin.dev
• GitHub: https://github.com/bubilife1202/crossfin
• OpenAPI: https://crossfin.dev/api/openapi.json
• MCP Server: https://www.npmjs.com/package/crossfin-mcp

Checklist

• Working mainnet integration (Base, USDC)
• 35 paid endpoints with x402 402 responses
• Service registry with 184 verified x402 services
• MCP Server with 16 tools (published on npm)
• Routing engine (6 exchanges, 10 bridge coins)
• 4 bundle APIs (Morning Brief, Crypto Snapshot, Kimchi Stats, Stock Brief)
• Agent guide API + discovery endpoint
• ACP compatibility layer
• OpenAPI 3.1 specification

Files changed

• typescript/site/app/ecosystem/partners-data/crossfin/metadata.json (updated description)
• typescript/site/public/logos/crossfin.png (logo)

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 1 Sum 2

[vercel]

@bubilife1202 is attempting to deploy a commit to the Coinbase Team on Vercel.

A member of the Team first needs to authorize it.

[Must-be-Ash]

Hi there, all commits must have verified signatures. Please sign them and tag me to review again.

Thanks!

[bubilife1202]

@Must-be-Ash Commits are now signed and squashed into a single verified commit. Also updated the metadata and PR description to reflect current product state (35 paid endpoints, 184 services, 16 MCP tools, routing engine, bundle APIs). Ready for review!

[Must-be-Ash]

must have verified signatures

[bubilife1202]

@Must-be-Ash The commit is now signed and verified ✅ — could you take another look when you get a chance? Thanks!

[Must-be-Ash]

Please provide a logo with a bit more resolution and tag me to review again
thanks