{"schema":"A2A/agent-card/1","name":"x402donghang","description":"Pay-per-call crypto intelligence APIs for AI agents. Crypto radar (lite/standard/pro), crypto brief, summarize, watchlist brief, single brief, token due-diligence, crypto intel. Primary product: Fresh crypto narrative research with market context and verifiable source URLs.","url":"https://x402donghang.duckdns.org/mcp","version":"1.4.0","protocol":"mcp-streamable-http","capabilities":{"streaming":false,"pushNotifications":false,"stateTransition":false},"skills":[{"id":"crypto-radar:lite","name":"Crypto Radar LITE","description":"Fast market-snapshot quick take. 1h window, CoinGecko price/24h + concise LLM read, no X/web search. ~3s.","price_usdc":"$0.008","url":"https://x402donghang.duckdns.org/x402/v1/crypto-radar/lite","free_sample":"https://x402donghang.duckdns.org/x402/v1/crypto-radar/sample"},{"id":"crypto-radar","name":"Crypto Radar","description":"Live narrative + sentiment radar. Recent X + web signals, CoinGecko snapshot, structured JSON, source URLs. 1h/6h/24h/7d.","price_usdc":"$0.02","url":"https://x402donghang.duckdns.org/x402/v1/crypto-radar","free_sample":"https://x402donghang.duckdns.org/x402/v1/crypto-radar/sample"},{"id":"crypto-radar:pro","name":"Crypto Radar PRO","description":"Deep 7d narrative radar. Expanded X+web search budget, more signals, higher-confidence synthesis. Daily/weekly dives.","price_usdc":"$0.08","url":"https://x402donghang.duckdns.org/x402/v1/crypto-radar/pro","free_sample":"https://x402donghang.duckdns.org/x402/v1/crypto-radar/sample"},{"id":"crypto-brief","name":"Crypto Brief","description":"Bilingual EN/ZH single-symbol market brief: bias, thesis, bullets, risks, invalidation, actions.","price_usdc":"$0.01","url":"https://x402donghang.duckdns.org/x402/v1/crypto-brief","free_sample":"https://x402donghang.duckdns.org/x402/v1/crypto-brief/sample"},{"id":"summarize","name":"Summarize","description":"Summarize a public URL or raw text into structured JSON: title, summary, key points, actions.","price_usdc":"$0.01","url":"https://x402donghang.duckdns.org/x402/v1/summarize","free_sample":"https://x402donghang.duckdns.org/x402/v1/summarize/sample"},{"id":"watchlist-brief","name":"Watchlist Brief","description":"Bulk bilingual briefs for 1-10 tickers in one call. One bias/thesis/risks/actions card per symbol.","price_usdc":"$0.05","url":"https://x402donghang.duckdns.org/x402/v1/watchlist-brief","free_sample":"https://x402donghang.duckdns.org/x402/v1/watchlist-brief/sample"},{"id":"single-brief","name":"Single Brief","description":"Single-symbol bilingual brief at a micro price. Cheap enough for per-token loops.","price_usdc":"$0.005","url":"https://x402donghang.duckdns.org/x402/v1/single-brief","free_sample":"https://x402donghang.duckdns.org/x402/v1/single-brief/sample"},{"id":"token-dd","name":"Token Due Diligence","description":"Token DD card: risk score/level, liquidity, holder concentration, red/green flags, verdict.","price_usdc":"$0.01","url":"https://x402donghang.duckdns.org/x402/v1/token-dd","free_sample":"https://x402donghang.duckdns.org/x402/v1/token-dd/sample"},{"id":"crypto-intel","name":"Crypto Intel","description":"Three-in-one derivative intelligence: funding regime, liquidation risk, market sentiment.","price_usdc":"$0.05","url":"https://x402donghang.duckdns.org/x402/v1/crypto-intel","free_sample":"https://x402donghang.duckdns.org/x402/v1/crypto-intel/sample"}],"payment":{"protocol":"x402","currency":"USDC","networks":["Base","Solana"],"description":"Pay-per-call with USDC via the x402 protocol (HTTP 402 challenge) on Base or Solana, OR use an operator-issued prepaid API key (Authorization: Bearer sk-x402-...). MCP tools/call charges the prepaid key; for on-chain payment call the REST endpoint directly.","apikey":{"header":"Authorization: Bearer sk-x402-...","balance_endpoint":"https://x402donghang.duckdns.org/x402/v1/apikey/balance"},"integrity":{"header":"X-Content-SHA256","description":"Every successful paid response carries X-Content-SHA256 (sha256 hex of the response body). Recompute the body sha256 and compare. See GET /x402/v1/golden/self-check."}},"discovery":{"openapi":"https://x402donghang.duckdns.org/openapi.json","well_known_x402":"https://x402donghang.duckdns.org/.well-known/x402","llms_txt":"https://x402donghang.duckdns.org/llms.txt","self_check":"https://x402donghang.duckdns.org/x402/v1/golden/self-check","sitemap":"https://x402donghang.duckdns.org/sitemap.xml"},"contact":{"name":"x402donghang","url":"https://x402donghang.duckdns.org/x402/health","email":"tangdonghang123@gmail.com"}}