Blog
Notes on money, markets, and method.
Essays, tutorials, and the math behind every Coinage feature.
A New Kind of Account
Checking pays 0.07%. Savings pays 0.38%. The best high-yield accounts in fintech pay 3.25% to 3.35%, and inflation is running at 3.4%. Every account you own is either ready or earning, never both.
August 12, 2026
EssayHow Many Years of Your Life Are You Selling to Interest?
By the time you retire, you will have worked years purely to service interest. Estimates of what the average American pays over a lifetime range from about $164K to about $649K. Translate that into work-years, and the unit changes from dollars into years of your life.
May 5, 2026
EssayCould a Car Pay for Itself?
The average new car loan is $43,925 at 6.39%. Here is the parallel-line math for matching each $736 payment with an investment, and what it could add up to under an illustrative return assumption.
May 3, 2026
EssayCould the Market Pay Your Grocery Bill?
A U.S. household spends about $10,000 a year on food, roughly $6,200 of it on groceries. Here is the ten-year math for matching the same monthly grocery bill with an investment, and what the gains could cover under an illustrative return assumption.
May 3, 2026
InteractiveTurn any spending category into an investing habit.
Move four sliders: monthly category spend, the slice you choose to invest, expected stock growth, and the profit-take rule that triggers each sale. Watch when gains could offset that category.
April 16, 2026
EssayYou Built This Economy. You Just Forgot to Get Paid.
Your spending powers the economy that drives stock returns. Spend matching puts you on both sides of that loop so market growth funds your everyday life.
April 16, 2026
EssayFrom the Coinage Act to the Coinage App
The Coinage Act of 1792 upgraded America from monetary chaos to monetary order. 230 years later, your checking account is still dead stock.
March 29, 2026
EssayCapitalism and Democracy Are the Greatest Wealth Engine Ever Built
The global economy has generated more wealth in the last century than in all of human history. Here's why most people's money still isn't part of it.
March 29, 2026
FeatureHow Spend Match Turns Spending into Investing
Every purchase you make can automatically invest a percentage into your portfolio. Here's how Spend Match works.
March 29, 2026
TutorialHow to Edit Your Nest
Add new stocks, remove old ones, adjust your allocations, and rebalance your entire portfolio in a few taps.
March 24, 2026
TutorialHow to Create a Goal Nest
Set a target amount and deadline, pick your stocks, and let Coinage track your progress. A walkthrough on Goal Nests.
March 24, 2026
TutorialHow to Create Your First Nest
A step-by-step guide to building a custom portfolio and setting up recurring investing in under two minutes.
March 24, 2026
FeatureNests — Build Your Own ETF in Minutes
Every brokerage built tools around the stock. But you've never believed in a single stock in isolation. Nests let you invest the way you actually think.
March 23, 2026
