Jerry T (@contentdj)

The Shareware Kid Who Took On Apple. How did a kid who sold shareware from his parents' house end up suing Apple and Google? ZZT, Unreal Engine, a two-month bet on free Fortnite, and the fight over the 30% app store toll. Full episode with sources on YouTube. #EpicGames #Fortnite #UnrealEngine #TimSweeney #BusinessHistory

Vector databases: how HNSW and ScaNN actually search. Vector databases find the 10 nearest out of millions in milliseconds. How HNSW graphs and Google's ScaNN buckets do it, and which one to pick. Full episode with sources on YouTube. #VectorDatabase #RAG #AI #Postgres #MachineLearning

How LiteLLM Works: One Word Switches Your AI Provider. Change one word in the model string and the same code calls Claude instead of GPT. A standalone codebase teardown. Repo link in the YouTube description. #LiteLLM #Python #LLM #AIGateway #CodeExplained

Garry Tan's AI Brain Treats Its Database as Disposable. GBrain, Garry Tan's AI agent memory, keeps 155,795 pages in Markdown and treats its Postgres database as a cache it can rebuild. A standalone codebase teardown. Repo: https://github.com/garrytan/gbrain #AIAgents #GBrain #GarryTan #Postgres #CodeExplained

The Card Company That Refused to Share. Visa moves 8x more money than American Express. Amex makes more revenue. Here's how the closed loop works, and how Amex built it. A freight company that lost its freight, the travelers cheque, a salad oil fraud, the Fresno drop that created Visa, and a 5–4 Supreme Court win. Full episode with sources on YouTube. #AmericanExpress #Amex #Visa #Payments #BusinessHistory

The Dutch Company Every Chip Depends On. ASML started in a leaky shed in 1984. Now it's the only company that makes EUV lithography machines. Philips, a near shutdown in 1988, the water trick that beat Nikon, and 22 years of EUV paid for by its own customers. Full episode with sources on YouTube. #ASML #Semiconductors #EUV #TSMC #BusinessHistory

The Best State Park in Washington Isn't What You Think. Deception Pass gets 3.4M visitors - but Moran, Steamboat Rock & Palouse Falls all rate 4.8 stars. The "best" park depends on what you actually want. Full episode with sources on YouTube. #WashingtonStateParks #PNW #DeceptionPass #PalouseFalls #HikingWashington

How AI agent identity actually works. Web Bot Auth, Visa TAP, Mastercard Agent Pay and Amex ACE are how stores tell your agent from a scraper. Episode 1 of 4 of Agentic Commerce. Full episode with sources on YouTube. Music: "Dreamer" Kevin MacLeod (incompetech.com), CC BY 4.0 #AgenticCommerce #AIAgents #Payments #Fintech #WebSecurity

A digital signature costs nothing, so who vouches for your AI agent? Mastercard makes agents register first. Amex covers registered agents' mistakes. Full episode on YouTube: "How AI agent identity actually works" #Mastercard #AmericanExpress #AgenticCommerce #AIAgents #Fintech

Visa's AI agents carry one signed tag to browse and another to buy. Here's how the Trusted Agent Protocol tells a store what your agent wants. Full episode on YouTube: "How AI agent identity actually works" #Visa #AgenticCommerce #AIShopping #Fintech #Payments

Websites can't tell your AI shopping agent from a scraper. Web Bot Auth fixes that with a cryptographic signature on every request. Full episode on YouTube: "How AI agent identity actually works" #AgenticCommerce #AIAgents #WebSecurity #Cloudflare #Payments

How does one made-up man keep stumbling into real history? The life of Forrest Gump, from leg braces to Watergate to Apple. #forrestgump #tomhanks #moviefacts #filmhistory #history #documentary

9 Optimus Prime facts you didn't know 🤖 Which one surprised you? #OptimusPrime #Transformers #FunFacts #Autobots #fyp

One thread. A million connections. Here's how the Node.js event loop pulls it off 🔁 Guess the print order before the reveal 👀 #nodejs #javascript #coding #programming #webdev #learntocode

Fortnite in 90 seconds: the rarest Sprite, Epic's forgotten first name, and the top earners of all time. Which fact got you? #fortnite #fortnitefacts #gaming #epicgames #fortnitesprites

How does buying inside ChatGPT work? OpenAI and Stripe's Agentic Commerce Protocol (ACP) connects ChatGPT to merchant checkout. Merchants share a product feed, ChatGPT sends the checkout request, and payment rides on a secure token instead of your card number. The merchant accepts the order, ships it, and stays the seller. ACP is open source. Part 12 of 12 in the Agentic Commerce series. Start from part 1: Web Bot Auth. #ACP #OpenAI #ChatGPT #Stripe #AgenticCommerce

How will you buy from Walmart, Target, and Etsy inside Gemini? Google's Universal Commerce Protocol (UCP) gives AI agents one checkout language. Built with Shopify, Etsy, Wayfair, Target, and Walmart, UCP covers discovery, cart, checkout, and returns through one interface. The retailer stays the merchant of record. It already powers checkout in Google AI Mode and Gemini. Part 11 of 12 in the Agentic Commerce series. Next: OpenAI and Stripe's Agentic Commerce Protocol. #UCP #Google #Gemini #AgenticCommerce #Ecommerce

How can your AI agent prove you approved a purchase? Mastercard Verifiable Intent attaches a tamper-resistant record to the payment. Built with Google and aligned with AP2, it encodes your spending rules, like a budget or a merchant, into a credential that travels through the Mastercard network. It shares only what's needed, and it's open source. Part 10 of 12 in the Agentic Commerce series. Next: Google's Universal Commerce Protocol. #Mastercard #VerifiableIntent #AgenticCommerce #Fintech #AIAgents

Your AI agent bought a $900 TV. Google's Agent Payments Protocol (AP2) uses signed mandates to prove what you actually approved. The intent mandate captures your instruction. The cart mandate locks the exact item and price. The payment mandate tells the bank an agent was involved. Each is cryptographically signed, so there's evidence if there's a dispute. Part 9 of 12 in the Agentic Commerce series. Next: Mastercard Verifiable Intent. #AP2 #Google #AgenticCommerce #AIAgents #Payments

How do AI agents pay APIs per request? Stripe and Tempo's Machine Payments Protocol (MPP), launched March 2026, uses HTTP 402 plus a receipt. MPP goes beyond one-off payments with price discovery, subscriptions, and balances. It works with stablecoins on Tempo or with cards, and the seller is paid into their Stripe balance either way. Part 8 of 12 in the Agentic Commerce series. Next: Google's AP2 mandates. #MPP #Stripe #Tempo #Stablecoins #AIAgents

HTTP 402 Payment Required sat unused for almost 30 years. Coinbase's x402 turns it into a way for AI agents to pay per API request. The server replies 402 with a price, say $0.01 in USDC. The agent signs a stablecoin payment, retries with proof attached, and gets the data. No account, no API key, no monthly bill. Part 7 of 12 in the Agentic Commerce series. Next: Stripe and Tempo's Machine Payments Protocol. #x402 #Coinbase #Stablecoins #AIAgents #Crypto

Stripe's Shared Payment Token (SPT) lets an AI agent pay a store without ever seeing your card, and it dies after one purchase. The token is scoped to one merchant, one maximum amount, and a short time window. The seller charges it through Stripe like a normal payment, with normal fraud checks. Once it's used or expired, it's worthless. Part 6 of 12 in the Agentic Commerce series. Next: x402 and HTTP 402. #Stripe #Payments #AgenticCommerce #ChatGPT #Fintech

What happens when your AI agent buys the wrong thing? Amex ACE (Agentic Commerce Experiences) connects agent intent, cart, and payment. Launched in April 2026, the developer kit lets builders register an agent, link a card member's account, and share what the customer asked for. Because Amex runs a closed-loop network, it can back registered agent purchases with Agent Purchase Protection. Part 4 of 12 in the Agentic Commerce series. Next: network and agentic tokens. #AmericanExpress #Amex #AgenticCommerce #AIShopping #Fintech

Before an AI agent can pay with Mastercard, it has to register. Here's how Mastercard Agent Pay gives agents a verified identity. Builders register and verify their agent. Merchants and banks can then check who they're dealing with, and if a purchase goes wrong there's a clear trail back to the builder. Part 3 of 12 in the Agentic Commerce series. Next: Amex Agentic Commerce Experiences. #Mastercard #AgentPay #AgenticCommerce #AIAgents #Fintech

Why your AI agent should use a token, not your real card number. Visa and Mastercard agentic tokens, explained in 40 seconds. A token stands in for your card and only works for one agent, with limits like a spending cap or specific merchants. If it leaks, it's useless elsewhere. If the agent misbehaves, you revoke that one token and your card keeps working. Part 5 of 12 in the Agentic Commerce series. Next: Stripe's Shared Payment Token. #Tokenization #Payments #AgenticCommerce #Visa #Mastercard

How does a store know your AI agent is legit and not a scraper? Visa's Trusted Agent Protocol (TAP) gives approved agents a signed pass. The signature proves three things: the agent is registered, it's acting for a real Visa customer, and it's here to browse or buy. TAP builds on Web Bot Auth, so merchants don't need new infrastructure. Part 2 of 12 in the Agentic Commerce series. Next: Mastercard Agent Pay. #Visa #AgenticCommerce #AIShopping #Fintech #Payments

Why do websites block AI shopping agents, and how does Web Bot Auth let the good ones in? Signed HTTP requests, explained in 40 seconds. Every request from the agent carries a cryptographic signature. The site checks it against a public key directory, then decides whether to let the agent in. It's an open IETF draft that Visa and Mastercard build on. Part 1 of 12 in the Agentic Commerce series. Next: Visa's Trusted Agent Protocol. #AgenticCommerce #AIAgents #WebSecurity #Cloudflare #TechExplained

Your Next Customer Won't Be Human Agentic commerce means AI agents that shop, compare, negotiate, and pay for you. Brands now have to win over machines too. You tell an agent what you want and your budget. It finds options, checks reviews, and checks out with secure, pre-approved payment credentials. No more hunting for flights or remembering to reorder groceries. That shifts how brands compete. Agents read clean product data, transparent pricing, and reliable fulfillment. Payment networks and fintech companies are building tokenized credentials, spending limits, and verification so agents can pay without exposing your card details. Follow for short breakdowns of AI agents and the future of payments.

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