user avatar
Mason Hall
Merit Systems
@0xMasonH
Open Agentic Payments. Building @agentcashdev at @merit_systems, prev investing + eng @a16z. Chess enthusiast.
New York City, NY
masonhall.tech
Joined December 2015
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  • Pinned
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    Mason Hall
    Merit Systems
    @0xMasonH
    Mar 18
    The Machine Payments Protocol (MPP) is here. And it's awesome. Let's proliferate Open Agentic Commerce (MPP + x402). Discover what's possible at MPPScan [dot] com
    user avatar
    Merit Systems
    Merit Systems
    @merit_systems
    Mar 18
    Introducing MPPscan, the ecosystem explorer for MPP: - Track usage metrics - Explore popular resources - Invoke with AgentCash or Tempo CLI Check out MPPscan [dot] com 🧵
    4.9K
  • user avatar
    Mason Hall
    Merit Systems
    @0xMasonH
    Dec 3, 2024
    PERSONAL UPDATE: After an amazing 3.5 years, I’m leaving a16z to work on something new (more on that below). It’s been an incredible experience getting to work with our portcos alongside some of the smartest people I know.
    88K
  • user avatar
    Mason Hall
    Merit Systems
    @0xMasonH
    Jan 11, 2023
    Never worry about testnet ETH again - if you have deployed any contracts to Mainnet/Goerli/Sepolia, you are eligible for 10 ETH on each of those testnets grabteeth.xyz
    142K
  • user avatar
    Mason Hall
    Merit Systems
    @0xMasonH
    May 26, 2022
    A smart contract that lets you bet with your friends on when the merge will happen. No oracle or adjudicator required 😎
  • user avatar
    Mason Hall
    Merit Systems
    @0xMasonH
    Mar 13, 2024
    Just posted the entire Bee Movie script to Ethereum for $5. We love the blobs
    73K
  • user avatar
    Mason Hall
    Merit Systems
    @0xMasonH
    Oct 28, 2021
    The 4 most dangerous words in venture capital are “this time it's different” The 13 most dangerous words in venture capital are “The 4 most dangerous words in venture capital are “this time it's different”" — @pmarca
  • user avatar
    Mason Hall
    Merit Systems
    @0xMasonH
    Oct 13, 2025
    x402 is progressing at an absurd rate. 1. @CoinbaseDev creates x402, launches SDKs 2. @Cloudflare adds x402 to their Agents SDK 3. @vercel (@ethanniser) creates the x402-mcp SDK 4. @merit_systems launches x402scan and ai-x402 SDK to complete the x402 coverage of ANY AI resource
    user avatar
    Merit Systems
    Merit Systems
    @merit_systems
    Oct 13, 2025
    As promised, the x402 AI SDK is live. Docs: echo.merit.systems/docs/x402
    76K
  • user avatar
    Mason Hall
    Merit Systems
    @0xMasonH
    Jan 16, 2025
    Excited to announce that we at @merit_systems have raised $10m from our friends at a16z crypto and Blockchain Capital to accelerate what we are calling Open Source Capitalism.
    31K
  • user avatar
    Mason Hall
    Merit Systems
    @0xMasonH
    Dec 29, 2021
    How my Reddit bot became ranked #2 out of 55k. A story about chess, cheating, and the most passionate community on Reddit. 🧵 👇 (1/15)
  • user avatar
    Mason Hall
    Merit Systems
    @0xMasonH
    Nov 12, 2025
    Replying to @alexalbert__
    Here's the prompt: <frontend_aesthetics> You tend to converge toward generic, "on distribution" outputs. In frontend design,this creates what users call the "AI slop" aesthetic. Avoid this: make creative,distinctive frontends that surprise and delight. Focus on: - Typography:
    17K
  • user avatar
    Mason Hall
    Merit Systems
    @0xMasonH
    Aug 8, 2024
    Why don’t we see more app tokens? There are three main issues that projects run into: (1) Governance - governance rights can introduce legal risks (and governance should be minimized anyway) (2) Value distribution - giving economic rights may raise concerns under US laws (3)
    57K
  • user avatar
    Mason Hall
    Merit Systems
    @0xMasonH
    Oct 28, 2024
    The urge to sequester myself in a cabin and write a textbook on Applied Memetics. How does this not exist? I'd draw on Dennett, Dawkins, Deutsch, Hofstadter, Shannon, etc. From fiction: Stephenson, Asimov, Tchaikovsky, etc.
    39K
  • user avatar
    Mason Hall
    Merit Systems
    @0xMasonH
    Oct 29, 2021
    It’s time we change the way auditing is done in web3 🧵
  • user avatar
    Mason Hall
    Merit Systems
    @0xMasonH
    Dec 23, 2022
    Excited to see where they take this - always supportive of chess x crypto cc @fiveoutofnine
    user avatar
    Avalanche🔺
    @avax
    Dec 23, 2022
    1/ In 1924, @FIDE_Chess was formed to revolutionize the game of chess. 100 years later, FIDE is again innovating the game, and they’re doing it on #Avalanche. With a global audience of over 500M, FIDE is building on Avalanche to bring chess to Web3. medium.com/avalancheavax/…
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    37K