# David YC Tseng > David YC Tseng is a product builder and AI agent architect based in Taipei. He co-founded Lootex, a cross-chain NFT marketplace that raised $9M and reached 80k+ MAU before shutting down in March 2026, and currently builds DAGRUN, a SwiftUI macOS agent runtime, and Polyox, a prediction market intelligence platform. Writes the Chinese-language Product Lab newsletter (1,000+ subscribers, since July 2022) and the daily AI Flash Note podcast. Single locale (`/en`). Source: https://davidyctseng.com. This file concatenates every project's full description verbatim so an LLM can ingest the entire body of work in one request. Based in Taipei, Taiwan (Asia/Taipei). Languages: en, zh-Hant. Topics: AI agents, AI agent architecture, Local-first software, macOS development, SwiftUI, iOS development, Large language models, Multi-LLM orchestration, Model Context Protocol, Agent2Agent protocol, Prediction markets, Web3, NFT marketplaces, Account abstraction, Product strategy, Technical writing. --- ## DAGRUN - Category: Product - Tags: AI, macOS, SwiftUI, Local-First, Multi-LLM, Agent - Canonical URL: https://dagrun-preview-website.vercel.app/ **Summary.** Agent Local Task Orchestrator — a native Mac app that turns AI into accountable, local-first workflows. Data never leaves the machine. Models never lock you in. DAGRUN (Agent Local Task Orchestrator) is a native macOS agent runtime built in SwiftUI by David YC Tseng. It turns AI from scattered prompts into accountable workflows your team can actually run. The problem isn't AI capability — it's deployment. Teams fear data leaks, get locked into single vendors, and rebuild automations from scratch every time. DAGRUN solves all three. Core architecture: - Local-First: All data stays on your Mac. LLMs only receive structured summaries, never raw files - Multi-Model Routing: Use OpenAI, Anthropic Claude, or on-device models (Ollama, Apple MLX) — pick the right model per step - Skill System: Install pre-built workflow templates, configure via UI, execute with one click - Approval Gates: Human review at high-risk steps — every execution logged with who, when, what - Audit Trail: Complete run logs with timing, inputs, outputs, and approvers How it works: 1. Install a Skill (self-contained workflow package: prompt + tools + scripts) 2. Authorize permissions (file access, email OAuth, etc.) 3. Click Execute — the agent triages inputs, routes to the right model, runs multi-step actions, and delivers artifacts 4. Review outputs, approve critical steps, export as Markdown/PDF Built in SwiftUI for deep macOS integration. Not a chatbot. Not a web app wrapped in Electron. A proper Mac-native agent workstation. Target users: - SME operations teams (document automation, receipt processing, report generation) - Consultants & system integrators (develop once, deploy to many clients) - Content teams (ideation → production → distribution pipelines) Engagement model: 14-day paid PoC sprints with before/after metrics. No free pilots. --- ## Lootex - Category: Product - Tags: Web3, NFT, GameFi, GKE, ERC-4337 - Canonical URL: https://davidyctseng.com/en/projects/lootex **Summary.** Cross-chain NFT marketplace for blockchain gaming. Co-founded and led product/engineering. Raised $9M seed, reached 140k+ wallets and 80k+ MAU. Featured as a Google Cloud case study. Lootex was a gamer-centric, cross-chain NFT marketplace — "Loot + Exchange" — co-founded by David YC Tseng in 2018 and operated until March 2026. The mission was simple: give digital asset ownership back to the players. The platform specialized in blockchain gaming assets with interfaces designed for characters, equipment, cards, and in-game items — not generic art-focused NFT browsing. Key features: - Cross-chain support across Ethereum, Polygon, BNB Chain, Arbitrum, Avalanche, Mantle, Base, and Soneium - 3D asset previews, NFT Launchpad, and Lootpedia analytics explorer - Smart Accounts powered by ERC-4337 account abstraction - Custom branded storefronts for game developers - Infrastructure on Google Kubernetes Engine with zero downtime during extreme traffic spikes Backed by Spartan Capital, Infinity Ventures Crypto, LD Capital, Akatsuki, Polygon Studio, HTC, Huobi Ventures, and angel investors including Kevin Lin (Twitch co-founder), Holly Liu (Kabam co-founder), and Patrick Lee (Rotten Tomatoes co-founder). The NFT market shifted dramatically. Lootex shut down in March 2026 after 8 years of operation. All on-chain smart contracts continue to function — user assets were never custodied. --- ## Polyox - Category: Product - Tags: AI, Prediction Markets, MCP, A2A, TypeScript - Canonical URL: https://davidyctseng.com/en/projects/polyox **Summary.** Prediction market intelligence platform aggregating Polymarket and Kalshi into unified consensus signals. AI agents trade autonomously across 2,100+ markets with $847M+ volume. Polyox is a prediction market intelligence platform — "Convergence of Truth." It acts as a cross-market consensus layer, aggregating real-time probability data from both Polymarket (decentralized) and Kalshi (regulated) into a unified view. Core capabilities: - Unified liquidity aggregation normalizing on-chain and off-chain order books - Weighted median consensus probability computation across fragmented markets - Arbitrage detection when probability spreads exceed thresholds - AI Agent network with specialized vertical agents: Hoops (NBA), Silicon (tech), Polls (elections), Macro (economics) - Real-time terminal with heatmaps and treemap volume visualization Built on an AI-native architecture with MCP, A2A, ERC-8004, and x402 micropayment protocol (USDC on Base Sepolia) — meaning AI agents can discover, call, and pay for Polyox intelligence autonomously. --- ## BYOF - Category: Product - Tags: Community, Social, Events - Canonical URL: https://davidyctseng.com/en/projects/byof **Summary.** Bring Your Own Friends — a curated social introduction platform where trusted friends nominate and present you, flipping the dating app model. Running bi-monthly events in Taipei. BYOF — Bring Your Own Friends. A curated social introduction platform that inverts dating app logic. Instead of writing your own profile, a trusted friend nominates you and speaks on your behalf. The tagline: "讓最懂你的人幫你說話" — Let the people who know you best speak for you. How it works: - A nominator writes a brief profile of a single friend they want to introduce - At bi-monthly "簡報之夜" (Presentation Night) events, nominators give 3-minute live presentations - Curated groups of 10-15 nominators per event ensure quality interactions - Application-based access with screening — invite codes expedite approval Currently running in Taipei with events on the 2nd and 4th Saturdays of each month. --- ## Correlate Health Insights - Category: Apps - Tags: iOS, Swift, Health, Journaling - Canonical URL: https://davidyctseng.com/en/projects/correlate **Summary.** Privacy-first iOS journaling app that treats your life as a personal dataset. Track habits, discover which behaviors correlate with your outcomes. 5.0 stars on the App Store. Correlate is a privacy-first iOS journaling and habit-tracking app. The core idea: journal your daily behaviors, then discover which habits statistically correlate with your successes. Features: - One-tap journal entries with customizable trackers for nutrition, water, weight, exercise, conversations, goals, and memories - All data stored entirely on-device — no cloud sync, no account required - Searchable journal with date-based navigation - Goal setting and habit monitoring over time - Data export for personal analysis - Universal app for iPhone, iPad, and Mac (Apple Silicon) Free to download with optional subscription ($1.99/month, $3.99/quarter, $7.99/year). --- ## FoodCamAI - Category: Apps - Tags: iOS, Swift, AI, Computer Vision - Canonical URL: https://davidyctseng.com/en/projects/foodcam **Summary.** iOS app using computer vision to make food logging instant. Point your camera at a meal to identify items and estimate nutritional content automatically. FoodCamAI is an iOS app that uses computer vision to simplify food logging. Point your camera at a meal, and the app identifies food items and estimates nutritional content — removing the friction that kills most diet tracking habits. Built as a native iOS application with on-device image recognition. --- ## Toki - Category: Apps - Tags: iOS, Swift, Date Tracker, Widgets - Canonical URL: https://davidyctseng.com/en/projects/toki **Summary.** A beautifully minimal iOS date tracker with widgets. Count up or count down to the moments that matter — birthdays, anniversaries, deadlines, milestones. Toki is a native iOS date tracker app with home screen widgets. Track the days that matter — count up from past events or count down to upcoming ones. Clean, focused, and designed to stay out of your way while keeping important dates visible at a glance. --- ## AI Flash Note - Category: Content - Tags: Podcast, AI, Substack, Chinese - Canonical URL: https://davidyctseng.com/en/projects/ai-flash-note **Summary.** Daily 10-minute Chinese-language AI podcast. Distilling signal from noise — covering model releases, tool updates, and industry shifts from OpenAI, Anthropic, DeepMind, and more. AI 新知快報 — 10 minutes a day to keep up with the new AI era. A daily Chinese-language podcast that curates the latest AI tools, model releases, tech trends, and industry dynamics. Published Monday through Friday with occasional weekend deep-dives. Topics covered: - Breaking AI tool releases and model updates (OpenAI, Anthropic Claude, Google DeepMind) - Tech industry dynamics and startup news (a16z, Palantir, Revolut) - AI in enterprise and workforce disruption - Open source vs. closed AI ecosystem developments - Weekend specials with longer-form analysis Available on Substack, Spotify, and Apple Podcasts. --- ## Product Lab Newsletter - Category: Content - Tags: Newsletter, AI, Web3, Substack, Chinese - Canonical URL: https://davidyctseng.com/en/projects/newsletter **Summary.** Chinese-language newsletter on AI and Web3 for developers and entrepreneurs. 59+ long-form articles and 1,000+ subscribers since 2022. From Claude Code teardowns to market analysis. 大衛曾產品實驗室 — David YC Tseng's Product Lab. A Chinese-language newsletter on AI and Web3 published since July 2022, with 59+ long-form articles and 1,000+ subscribers. Sits in the front row of the AI and Web3 wave, helping developers and entrepreneurs find practical paths and break free from information anxiety. Topics covered: - AI tools and infrastructure (Claude Code, LangChain, agent frameworks) - Context engineering and agentic system design - Web3, DeFi, and fintech analysis - Software evolution (Software 2.0, vibe coding) - Product strategy and startup analysis - Industry deep-dives (Palantir, a16z investment thesis) Published since July 2022 with 59+ long-form articles and 1,000+ subscribers. --- ## Contact Email: davidyctseng@gmail.com. Page with copy-to-clipboard: https://davidyctseng.com/en/contact. Also reachable via https://www.linkedin.com/in/davidyctseng/, https://x.com/davidyctseng, https://davidyctseng.substack.com, https://www.facebook.com/davidyctseng.