# x402donghang Crypto Radar

> Primary product: live Crypto Radar with recent source URLs and market context. Pay with x402 USDC on Base/Solana or an operator-issued prepaid API key.

## Start here
- Free BTC sample: GET https://x402donghang.duckdns.org/x402/v1/crypto-radar/sample
- Fresh custom radar: POST https://x402donghang.duckdns.org/x402/v1/crypto-radar — $0.02/call
- Request schema and examples: https://x402donghang.duckdns.org/openapi.json

## Quick start (API Key — no wallet needed)
1. Get a key: POST https://x402donghang.duckdns.org/x402/v1/apikey/create (admin-only; contact @PayPerAI_x402)
2. Check balance: GET https://x402donghang.duckdns.org/x402/v1/apikey/balance (Authorization: Bearer sk-x402-...)
3. Top up: send payment to the operator; only the operator can credit a verified deposit
4. Call any paid endpoint with header: Authorization: Bearer sk-x402-...
5. Balance auto-debited per call; response headers X-Balance-After and X-Price-Charged show remaining

## Discovery
- Website: https://x402donghang.duckdns.org/x402/
- OpenAPI: https://x402donghang.duckdns.org/openapi.json
- x402 manifest: https://x402donghang.duckdns.org/.well-known/x402
- Integration guide: https://x402donghang.duckdns.org/x402/integrate
- Free samples: https://x402donghang.duckdns.org/x402/v1/samples
- Service info: https://x402donghang.duckdns.org/x402/v1/info
- API Key management: https://x402donghang.duckdns.org/x402/v1/apikey/balance

## Paid tools
- Live crypto radar: POST or GET https://x402donghang.duckdns.org/x402/v1/crypto-radar — $0.02 per call
- Crypto radar LITE (fast quick take, 1h): POST or GET https://x402donghang.duckdns.org/x402/v1/crypto-radar/lite — $0.008 per call
- Crypto radar PRO (deep 7d dive): POST or GET https://x402donghang.duckdns.org/x402/v1/crypto-radar/pro — $0.08 per call
- Crypto brief: POST https://x402donghang.duckdns.org/x402/v1/crypto-brief — $0.01 per call
- URL/text summarize: POST https://x402donghang.duckdns.org/x402/v1/summarize — $0.01 per call
- Watchlist brief (up to 10 tickers, one call): POST https://x402donghang.duckdns.org/x402/v1/watchlist-brief — $0.05 per call
- Single-symbol brief (cheap per-token loops): POST https://x402donghang.duckdns.org/x402/v1/single-brief — $0.005 per call
- Token due diligence card: POST https://x402donghang.duckdns.org/x402/v1/token-dd — $0.01 per call
- Crypto intel (funding + liquidation + sentiment): POST https://x402donghang.duckdns.org/x402/v1/crypto-intel — $0.05 per call

## Retired (410 Gone — do not call)
- OpenAI-compatible chat (/v1/chat/completions, /v1/models/*/chat/completions), starter deal, image-gen, video-gen were removed in the 2026-09-05 SKU trim. Use the crypto-data tools above.

## Trust & integrity
- Every successful paid response carries header X-Content-SHA256 = sha256 hex of the response body bytes. Recompute the body sha256 and compare.
- Self-check endpoint (free, no 402): GET https://x402donghang.duckdns.org/x402/v1/golden/self-check — live price table, receiving-address prefixes, and verify instructions.