Cyberia

CXcentury index

$1.42

for 1 CX — the basket that cost $1 on 2022-01-07

1.421.431.4409-2309-2409-2509-2609-2709-2809-29

dollars per CX · fix of 2026-09-29 · hover the line for any day

What it is

The unit of account for century-scale obligations. A fixed basket of eight world assets: whoever owes the index owes quantities, and the quantities never change. A 25–80 year lease outlives every currency it could be written in — so the payment is a portfolio instead of a number.

Basket

crypto 35.0%fiat 30.0%elements 35.0%

leg	fix (USD)	quantity	weight	share now
BTC	79,902.48	0.000004197	20%	23.4%
ETH	2,522.29	0.000053024	15%	9.3%
CNY	0.145157	0.96724	15%	9.8%
USD	1	0.15000	15%	10.4%
GOLD	4,444.45	0.000083486	15%	25.9%
CU	12,687.61	0.000010687	10%	9.4%
OIL	85.75	0.0007021	5%	4.2%
UX	67.85	0.0015148	5%	7.1%

Quantities are what one CX holds. Weight is what a lease is written at; share is what the leg has become. Quantities were fixed on 2022-01-07 and never change, so the shares drift with prices — since 2022-01-07 the basket has moved to crypto 32.8% · fiat 20.3% · elements 46.8%. A lease signed today starts at the weights, not the drift. Every fix is a trailing 365-day average.

Definition

q_i = w_i · R₀ / P_i(t₀) R(t) = Σ q_i · P_i(t)

quantities fixed at signing · every price a trailing 365-day average of daily fixes

Mechanics

Reset — annual, on the contract anniversary; the TWAP window ends 30 days before payment, so the tenant knows the invoice a month ahead
Ruler — bitcoin: the basket is priced in sats over the BTC/USD 365-day TWAP
Collar — +35% / −15% per year in sats; wide enough to deliver the full index path, halving the descent toward the floor
Dual floor — never fewer satoshi than year 0, never fewer year-0 dollars; whichever binds
Oracle — a daily on-chain fix; on divergence the annex computation from named public fixes prevails — index disputes are arithmetic, never renegotiation

Pricer

What the index is for. The product is a leasehold — the right to use a parcel for a term, never its title. Part of its value is taken as a premium at signing, the rest returned as rent, indexed for the life of the contract. One thing moves: the indexation, so the lease can be stress-tested across the collar. The deal and the estate's underwriting are stated as the fixed figures they are, shown so the price can be checked rather than taken on faith.

Sources

This published series is a reconstruction from free public data, not the contractual annex fix: BTC and ETH from Coinbase daily closes, gold from the LBMA PM fix, CNY from the ECB reference rate, Brent and the IMF copper and uranium assessments from FRED. Copper and uranium publish monthly and carry forward between prints. A signed lease names its own fixes with fallbacks — see the protocol page in the graph. Machine-readable: cx.json.