Spot, futures and stale quotes: which oil price are you seeing?

Two websites can display different oil prices without either number being fabricated. They may be showing different benchmarks, delivery periods, currencies, or observation times. Before asking which number is right, ask exactly what each number measures.

Build a quote label

A useful label includes the asset or benchmark, instrument, units, currency, source, and time. WTI is not the same benchmark as Brent. A price per barrel is not a price per liter. A futures quote for one contract month is not automatically interchangeable with a spot assessment or another delivery month.

Spot markets concern physical oil for near-term delivery under specific terms. Futures are contracts with defined specifications and delivery periods. The EIA guide to crude spot prices explains why crude grades have persistent price differentials. Its figures should not be treated as an executable offer from a broker.

A comparison you should reject

Imagine one card says WTI, USD 80 per barrel, observed Friday, and another says Brent, USD 83 per barrel, observed Monday. Subtracting them produces 3 dollars, but that is not a clean same-time benchmark spread. Time and benchmark changed together. All numbers here are illustrative.

A better comparison holds as much constant as possible. Match timestamps and currency, identify the contract or assessment, and note whether a value is delayed, last traded, bid, ask, or settlement. If those fields are absent, describe the difference as an unverified comparison rather than inventing precision.

A flat chart may be an old chart

An unchanged displayed number does not prove the market has been calm. A source might be delayed, a market may be closed, or a request may have failed. Look for the source timestamp and freshness status. Refreshing a page only tells you when you requested it; it does not tell you when the underlying price was measured.

• Keep stale data visibly labeled in your notes.
• Do not replace a missing price with zero or a plausible-looking estimate.
• Check whether a percentage change uses the previous close, a rolling 24-hour period, or another baseline.

Turning a quote into a useful observation

Write: benchmark, instrument if known, value, currency/unit, source time, and limitations. Then add your interpretation separately. This distinction is especially useful when discussing markets with friends: everyone can see where the observation ends and your opinion starts.

For physical-unit arithmetic, try the oil converter. Converting volume does not establish the market value or quality of a particular crude cargo.