Every conversation about fuel eventually reaches the same question: who actually decides what oil costs? The honest answer is nobody and everybody, through a handful of institutions that each hold one piece of the machine. Understand one principle first and the rest of this page falls into place: oil's price is really three prices stacked on top of each other. A benchmark price, set by futures trading, carries the world's expectations about supply and demand. A differential, set against published assessments, adjusts that benchmark for what a specific barrel actually is and where it actually sits. And a local basis carries the last-mile logistics to your rack or your berth. This page introduces the institutions behind each layer, and one more idea worth keeping: markets move on surprise, not on news. A widely expected production cut moves nothing on announcement day, because it was priced in weeks earlier; an unexpected inventory build moves everything. Our fuel pricing guide covers what the numbers mean for a buyer's invoice; this one covers who makes the numbers, and why the machine works the way it does.
OPEC and OPEC+: the supply managers
The Organization of the Petroleum Exporting Countries, founded in Baghdad in 1960 and headquartered in Vienna, is a dozen-odd producing nations, Saudi Arabia at the center, that coordinate production levels; since 2016 the wider OPEC+ arrangement has folded in Russia and other large producers. The group's real lever is not its share of production, roughly 40 percent counting the plus, but its near-monopoly on spare capacity: producing wells deliberately held idle that can be brought on in weeks, historically a few million barrels a day, most of it Saudi. Spare capacity rules because of a quirk of oil economics: in the short run, neither supply nor demand responds much to price. Nobody cancels the school run because diesel rose a dime, and no well shuts in because crude dipped five dollars, so even a small physical imbalance, one percent of a hundred-million-barrel-a-day market, needs a violent price move to clear. Whoever controls the marginal million barrels controls where that violence lands, and that is the seat OPEC occupies.
The group's history is a textbook cartel problem playing out in public. A cartel raises price by restraining output, but the more it succeeds, the more each member is tempted to cheat, because every barrel produced above quota sells at the price the others' restraint created. So OPEC's decades run in cycles: discipline, quiet cheating, an enforcement price war in which the low-cost producer opens the taps to punish everyone (1986, the 2014 campaign against US shale, the brief 2020 collision with Russia), then a new agreement. Underneath runs the deeper dilemma: defend a high price and you finance your own competitors, since every dollar of price is a dollar of breakeven room for shale drillers and a nudge toward demand destruction; defend market share and you starve the national budgets the cartel exists to feed. When an OPEC meeting moves the market, the mechanism is the futures curve: traders holding a forecast of every future month's supply reprice that entire path the moment the guidance changes, which is why a two-sentence communiqué can move billions in seconds.
The Texas footnote belongs on a Texas company's website, and it is more than a footnote. Modern production management was invented in Austin. After the East Texas field opened in 1930 and crashed crude to pennies, the state put the Railroad Commission in charge of prorationing: monthly allowables matched to forecast demand, well by well, which stabilized world prices for four decades while Texas held the planet's spare capacity. OPEC's founders, Venezuela's Pérez Alfonso foremost, openly studied the RRC and said so. The pivot came in the spring of 1971, when the commission set allowables at 100 percent for the first time: Texas had no spare barrels left, the swing role crossed the Atlantic, and within two years the 1973 embargo demonstrated exactly who held it. The commission that files your P-5 today once did OPEC's job, and did it longer than OPEC has existed.
NYMEX and ICE: where the price trades in public
The number on every screen is a futures price: a standardized contract to deliver or receive a fixed quantity of a defined grade at a defined place and month. On NYMEX, the New York Mercantile Exchange, now part of CME Group, the WTI contract is 1,000 barrels of light sweet crude deliverable at Cushing, Oklahoma, and that delivery obligation is not a formality; it is the anchor. As a contract month expires, its price must converge with the physical market, because any gap is free money to whoever can make or take delivery, and Cushing, a pipeline crossroads wrapped in tank farms, is where that arbitrage gets settled in steel. The market delivered a brutal proof of the anchor on April 20, 2020: with the pandemic collapsing demand and Cushing's tanks effectively spoken for, the expiring May contract settled at 37 dollars and 63 cents below zero. Holders with no ability to take delivery paid to escape the obligation. A price that can go negative because tanks are full is a price tied to physical reality, which is precisely its value.
Who trades it, and why the volumes look outsized: hedgers on both sides use the contract to transfer price risk. A producer sells futures to lock revenue on barrels not yet pumped; a refiner, an airline, or a Texas distributor fixing a school district's winter diesel bid buys the other side, using the ULSD contract to turn an unknowable cost into a known one. Speculators stand between them, absorbing the risk each hedger sheds in exchange for expected return, and the continuous auction among all of them is price discovery. Paper volume runs many times physical production because the same barrel's risk is transferred, laid off, and re-hedged repeatedly on its way from wellhead to wingtip, and that repetition is the function, not froth: without the deep paper market, neither a cargo nor a season of fuel could be priced with confidence. NYMEX's RBOB gasoline and ULSD diesel contracts anchor US fuel the same way, and London's ICE exchange hosts Brent, the waterborne world's benchmark, a North Sea complex of grades held together by futures and assessments, because a pipeline continent and a tanker world each need a reference of their own.
One more instrument of learning hides in plain sight: the shape of the curve. When later months trade above the front, contango, the market is saying surplus: it literally pays to buy oil now, store it, and sell it forward, which is why gluts fill tank farms and, in 2020, an armada of chartered tankers sat at anchor as floating storage. When the front trades above later months, backwardation, the market is saying tightness now: barrels today command a premium, and holding inventory is punished. Traders read the curve the way a mud engineer reads a trend sheet: not as today's number, but as the system's own forecast of what is coming.
Platts, Argus, and the price reporters
Futures price two benchmarks; the world sells ten thousand things that are not exactly WTI at Cushing or Brent on the water. That gap belongs to the price reporting agencies, Platts and Argus foremost, whose daily assessments of specific grades at specific places become the reference numbers written into real contracts. The mechanics deserve a paragraph, because they are cleverer than "reporters ask around." The agencies run published methodologies built on structured trade reporting: firms submit bids, offers, and completed deals, and the day's assessment leans hardest on a defined end-of-day pricing window, the Market on Close process in Platts' case, where transactions are most visible and most scrutinized. Participants trade that window deliberately, because the print settles their contracts, and the agencies police the circularity, deals reference the assessment while the assessment observes the deals, with verification, corrections processes, and, since the benchmark scandals of the early 2010s, oversight aligned to international principles for price reporting. It works for the same reason auditing works: everyone's invoices depend on the number being defensible.
Read a differential and you are reading compressed information: the discount on a heavy sour grade prices the extra refining effort its sulfur and gravity demand, and the spread between the same product in two ports prices the freight between them. When a cargo trades at an assessment plus or minus, or a rack supply deal settles on a published average, this machinery is the index, and it is why a serious buyer asks not just "what is the price" but "priced against what, assessed by whom."
The statistics: EIA, API, IEA, and the stockpiles
Markets reprice on information, and the most honest information in oil is inventories. Stocks are the buffer between supply and demand, so the weekly change in stocks is the closest thing the market has to a direct reading of imbalance: a build means supply exceeded demand that week somewhere in the system, a draw means the opposite, and neither lies the way forecasts can. The US Energy Information Administration, the independent statistics arm of the Department of Energy, publishes the petroleum status report every Wednesday morning: crude and product inventories, the Cushing number that WTI watches doubly hard, production, refinery runs, and implied demand. Analysts publish expectations beforehand, and the price reaction keys on the gap between print and expectation, not the print itself, five million barrels of build moves nothing if six million was feared. The American Petroleum Institute, the industry's standards body, publishes its own survey the evening before, which is why prices often jump twice a week; the same API also writes the technical standards this library leans on from mud testing to tank construction, and lends its name to the gravity scale.
Around the weekly rhythm runs a monthly one: three outlooks, from the EIA, from OPEC's own research arm, and from the International Energy Agency in Paris, frame the world's expectations of supply and demand, and revisions in them move markets the same way inventory surprises do. The IEA itself is a child of the 1973 embargo, founded as the consuming countries' counterweight, and its standing job includes coordinating strategic stocks: government reserves like the US Strategic Petroleum Reserve, hundreds of millions of barrels in Gulf Coast salt caverns, held for the bad day and released or loaned when supply breaks. Markets treat those releases as what they are, borrowed time rather than new supply, and price them accordingly. Between the cartel's meetings, the exchanges' trading, the reporters' assessments, and the statisticians' Wednesdays, that is the whole machine that turns geology and geopolitics into the number on your invoice.
Common questions
Why do prices move on OPEC meetings that change nothing?
Because the market prices expectations, not announcements. A meeting that holds quotas steady when a cut was expected is bearish news wearing a neutral press release, and traders reprice the difference. The announcement is always measured against what was already in the price.
What are contango and backwardation, in one breath?
The curve's shape as a message: later months pricier than the front (contango) says surplus, and pays the trade that buys, stores, and sells forward; front pricier than later (backwardation) says tightness now, and punishes holding inventory. The curve is the market publishing its own scarcity forecast.
Is the futures price the price anyone actually pays?
Almost never directly: physical barrels trade at differentials to benchmarks, and fuel loads at racks priced off the futures complex plus local supply. The futures price is the tide; the basis and differentials are the local waves. Both matter to your invoice.
Who watches all this for a fuel buyer?
A supplier worth having. Reading the EIA report, the OPEC calendar, the curve's shape, and the local rack behavior is part of the wholesale trade's job description, and passing along what's coming, spec transitions, likely tightness, a market worth locking, is half the value of the relationship.
Where Vexon fits
Vexon trades physical fuel and crude priced off exactly this machinery, NYMEX-linked contracts, published indexes, assessed differentials, and does it with the market context this page describes. Related reading: how fuel pricing works, crude oil basics, and chartering a tanker. For supply or cargo conversations, get in touch.