Mason Hall (@0xMasonH) / X

Mason Hall

1,630 posts

Mason Hall

@0xMasonH

Open Agentic Payments. Building @agentcashdev at @merit_systems, prev investing + eng @a16z. Chess enthusiast.

New York City, NY

Joined December 2015

@0xMasonH

See Mason Hall’s full profile

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Mason Hall
@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
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 🧵
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Mason Hall
@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.
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Mason Hall
@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
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Mason Hall
@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 😎
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Mason Hall
@0xMasonH
Mar 13, 2024
Just posted the entire Bee Movie script to Ethereum for $5. We love the blobs
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Mason Hall
@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
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Mason Hall
@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
Merit Systems
@merit_systems
Oct 13, 2025
As promised, the x402 AI SDK is live. Docs: echo.merit.systems/docs/x402
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Mason Hall
@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.
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Mason Hall
@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)
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Mason Hall
@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:
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Mason Hall
@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)
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Mason Hall
@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.
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Mason Hall
@0xMasonH
Oct 29, 2021
It’s time we change the way auditing is done in web3 🧵
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Mason Hall
@0xMasonH
Dec 23, 2022
Excited to see where they take this - always supportive of chess x crypto cc @fiveoutofnine
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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