The Last Day FLAT Costs $1.00
May 12, 2026 — Today marks a historic moment for the FLAT protocol. As you read this, the Bureau of Labor Statistics (BLS) is releasing the April 2026 Consumer Price Index (CPI-U) data. Once we update the on-chain oracle with this number, FLAT's price will begin rising — every 12 seconds, every block — and it will never return to $1.00 again.
This post documents the before.
The Current State: $1.00000000000000000
Screenshot taken May 12, 2026 at 12:43 PM — Block 25,077,464. Oracle Price: $1.000000000000000000.
Right now, the FLAT oracle price is exactly one dollar. This is the base value — the starting point from which all future CPI adjustments will compound. The current CPI-U index (March 2026) is 330.293.
What Is CPI-U?
The Consumer Price Index for All Urban Consumers (CPI-U) is published monthly by the U.S. Bureau of Labor Statistics. It measures the average change in prices paid by urban consumers for a basket of goods and services. It is the most widely cited measure of inflation in the United States.
FLAT is pegged to CPI-U. Not to a dollar. Not to a basket of crypto assets. To the actual, measured cost of living.
79 Years of CPI-U Data
The chart below shows the complete history of CPI-U from 1947 to today. This is the same data available at FRED (Federal Reserve Economic Data).
| Decade | CPI-U Start | CPI-U End | Total Inflation |
|---|---|---|---|
| 1950s | 24.1 | 29.6 | +23% |
| 1960s | 29.6 | 38.8 | +31% |
| 1970s | 38.8 | 82.4 | +112% |
| 1980s | 82.4 | 130.7 | +59% |
| 1990s | 130.7 | 172.2 | +32% |
| 2000s | 172.2 | 218.1 | +27% |
| 2010s | 218.1 | 258.8 | +19% |
| 2020s | 258.8 | 330.3* | +28%* |
*2020s data through March 2026
The trend is clear: the dollar loses purchasing power every decade. A dollar in 1947 is worth about 6 cents today. CPI-U has risen from 21.48 to 330.29 — a 15.4x increase over 79 years.
How the FLAT Oracle Works
The CPIOracle v3 contract at 0xd4aA8f16258451561f7fc2B2CD0f0a59Db43c664 uses linear block-by-block interpolation to smoothly adjust the FLAT price over 216,000 blocks (~30 days):
- Owner calls
updateCPI(newValue)with the latest CPI-derived price - The contract stores the current price as
previousCPIValueand the new price ascurrentCPIValue - Over the next 216,000 blocks,
getInterpolatedPrice()returns a value that linearly transitions from old → new - Every ~12 seconds (one Ethereum block), the price ticks up by a tiny increment
The Math
If the April CPI-U comes in at (for example) 332.0, representing a +0.517% monthly increase, then:
New oracle value = 1.00000 × (332.0 / 330.293) = 1.00517...
Daily increment = 0.00517 / 30 = 0.000172 per day
Per-block increment = 0.00517 / 216,000 = 0.0000000239 per block
That means after the update, the price on the Buy FLAT page will show:
- Block 0: $1.00000000000000000
- Block 1 (12 seconds later): $1.00000002393...
- Block 7,200 (1 day later): $1.00017...
- Block 216,000 (30 days later): $1.00517...
The price rises continuously, smoothly, and irreversibly — exactly like inflation itself.
The 2% Circuit Breaker
The contract includes a safety mechanism: no single updateCPI() call can change the price by more than 2% (200 basis points). Since monthly CPI-U changes are typically 0.2–0.8%, this provides a massive safety margin while preventing any catastrophic oracle manipulation.
What Happens Next
Later today, after the BLS publishes the April 2026 CPI-U number:
- We will calculate the new oracle value based on the official BLS data
- The owner wallet will call
updateCPI()on the CPIOracle contract - The FLAT price will begin its first-ever upward interpolation
- We will publish a follow-up post showing the price change in real-time
After this update, FLAT will never cost $1.00 again. Every day, every block, every 12 seconds — it will be worth slightly more than the day before. Not because of speculation. Not because of hype. Because the cost of living went up, and FLAT tracks the cost of living.
Why This Matters
Every other stablecoin — USDT, USDC, DAI — is pegged to a dollar that loses value every year. Holding them means losing purchasing power at the rate of inflation. You're guaranteed to be poorer next year in real terms.
FLAT is different. It tracks what your money can actually buy. If eggs cost more next month, FLAT is worth more next month. If rent goes up, FLAT goes up. It's not a stablecoin in the traditional sense — it's a stable purchasing power coin.
Today is the last day the price is $1.00. Tomorrow begins the era of continuous appreciation.
— Flat Protocol team
Data source: FRED CPIAUCSL — U.S. Bureau of Labor Statistics, Consumer Price Index for All Urban Consumers: All Items in U.S. City Average