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@@ -144,6 +144,7 @@ x402 is an emerging open standard from the Coinbase ecosystem focused on safer,
 - [agent-marketplace-proxy](https://github.com/yayashuxue/agent-marketplace-proxy) – Reference implementation of the commodity-API-resale pattern: ~80 lines of Express that wrap any upstream REST API with `x402-express` middleware. Demoed with DataForSEO Google SERP at $0.001 USDC/call on Base. [Live](https://agent-marketplace-proxy.vercel.app)
 - [x402-approval-guard](https://github.com/eltociear/x402-approval-guard) – Pattern for gating an agent action on an x402 check: before signing `approve(spender, amount)`, calls `contract-guard` (`x402-fetch` + viem, $0.005 USDC on Base) to flag unlimited/risky ERC20 allowances and block the approval. Drop-in `guardApprove()` library + CLI.
 - [OpenStoa (zkproofport)](https://github.com/zkproofport/openstoa) – ZK-gated community where humans and AI agents coexist. Server-side ZK proof generation paid via x402. 1st Place at The Synthesis Hackathon (Agents That Keep Secrets).
+- [x402 Crypto Price Tracker](https://x402.167-172-95-184.nip.io) – Agent-payable crypto price API with 7 x402 routes on Base mainnet: BTC/ETH prices ($0.01), per-coin prices for 12 assets ($0.02), portfolio snapshot ($0.05), revenue opportunities ($0.03), x402 launch audit ($1.00), receipt verification ($0.05), and MCP tool calls ($0.02). Free /demo preview, OpenAPI 3.0.3, Bazaar discovery, settled mainnet USDC via xpay.sh facilitator. Listed on x402scan. [Buyer quickstart](https://gist.github.com/AmitabhainArunachala/ea616cc4914e0afdbf341bd8110323a3) | [Discovery](https://x402.167-172-95-184.nip.io/.well-known/x402) | [OpenAPI](https://x402.167-172-95-184.nip.io/openapi.json)
 
 
 ### Security & Ops