In most agricultural economies the farmer sells at the farm gate, to an aggregator, at a price they have no way of checking, for a grade they have no way of disputing. A commodity exchange built on warehouse receipts changes all three at once: the lot is graded and receipted, the price is discovered in a public auction, and the receipt is collateral a bank will actually lend against.
The chain from farm to processor is long, and every link in it prices the risk that the next link is misinforming them. That risk is real, and the cost of it is paid almost entirely by the person at the start.
An aggregator quotes a number. The seller has no reference price for their grade, in their region, this week, and no practical way to reach a second buyer before the crop deteriorates. The information asymmetry is the aggregator’s margin.
Moisture, foreign matter, defect count and bean size determine value, and in a farm-gate sale they are assessed by the party who benefits from assessing them harshly. Disputes are settled by the seller accepting the assessment or taking the crop home.
A paper receipt can be forged, double-pledged or simply lost, so lenders discount it heavily or refuse it. Stored crop that ought to be good collateral is dead capital, and the farmer sells at harvest — into the lowest price of the year — because they cannot borrow against the alternative.
Where a reference price is published at all it is a survey figure, a week old, for a national average grade that nobody actually trades. It is better than nothing, which is the strongest thing that can be said for it.
The exchange is the smaller half of the reform; the graded, receipted lot is the larger. Together they turn a bilateral negotiation over an unverifiable good into a public auction over a defined one.
“Maize, grade 2, Nakuru warehouse, 2026 crop” is an instrument with its own order book and its own price. Grading stops being an argument at the point of sale and becomes an inspection at the point of deposit, done once, by someone with no position in the trade.
One call auction a day at a published time produces a price formed from real orders in a defined grade. That number travels — by SMS, by radio, by the aggregator’s own phone — and the farm-gate conversation starts from it instead of from nothing.
A registered electronic receipt, backed by an inspected deposit in a bonded warehouse, with a daily market price attached to it, is collateral a lender can value and enforce. That is what lets a farmer or a cooperative hold the crop past harvest, which is where most of the recoverable value is.
A cooperative’s lot is in the same book as everyone else’s, and price–time priority does not know how large the seller is. The buyer who values that grade most highly takes it, rather than the buyer who happened to drive down that road.
A day of small lots between the same processors and brokers nets to a handful of payments per settlement date, which matters a great deal where the payment rail is slow, expensive, or both.
An exchange that a broker with a laptop and an intermittent connection can actually use, with the session flexibility a harvest calendar demands.
| Setting | Typical starting point |
|---|---|
| Instrument | Commodity × grade × warehouse × crop year |
| Lot size | One tonne, or the receipt denomination |
| Sessions | One call auction a day; per-instrument and per-day overrides for the harvest calendar |
| Validity | DAY and GTD, so a seller can rest an offer across several auctions |
| Price band | A tolerance around the previous uncrossing, halting rather than printing outside it |
| Members | Brokers acting for farmers, cooperatives and processors under a Firm / Node / User hierarchy |
| Settlement | Netted cash on a short cycle; receipt reassignment instructed to the warehouse |
Call auctions scheduled per instrument with per-day overrides, so a thinly traded grade can uncross twice a week while the main crop trades daily through the harvest.
Read more →03 · channelA bundled Client Trading Front-End means member brokers participate on day one with nothing to install and short onboarding — decisive where members have no development capability at all.
Read more →02 · channelInstruments, grades, warehouses, calendars and participants maintained in a browser by a small operations team, with four-eyes approval on every market-affecting change.
Read more →05 · post-tradeNetting per participant and settlement date, fees per trade, and enriched trade-capture records that tell the warehouse which receipts to reassign.
Read more →This is the market where the engine is the smallest part of the programme. Almost everything that makes it work is institutional, and most of it has to exist before the first auction is worth running.
Bonded, inspected, insured storage with an operator who can be held liable, and an electronic warehouse receipt statute that makes the registered receipt the legal title. Several countries have run exchanges without that statute; the receipts were not bankable and the exchanges did not take. This is legislation, not integration.
Published grade standards, trained inspectors, calibrated equipment at every delivery point, and a way for a depositor to contest an assessment. If the grade cannot be trusted, the instrument is meaningless and the book is trading a fiction.
A registry that records who holds which receipt, supports pledging to a lender, and reassigns on settlement. Mehrex emits the trade-capture records that say what must move; the registry that moves it, and stays reconciled with the engine’s positions, is a system you build and operate.
Bank transfer, mobile money, or both, with settlement finality your rules can rely on. In practice this is the constraint that sets the settlement cycle, and it is worth designing the cycle around the rail rather than the other way round.
Brokers, cooperatives and processors have to be recruited, licensed, trained and given a reason to abandon a system that pays some of them very well. Budget for field operations and for several seasons of patience; exchange launches in this sector fail on adoption far more often than on technology.
Price floors, strategic reserves, export bans and subsidy programmes can be announced overnight and can suspend the economic logic of your market for a season. Your rulebook needs to say what the venue does when that happens, and your operators need the Control Panel to be able to do it.
It trades whatever the instrument definition says it trades. A receipt-backed lot — commodity, grade, warehouse, crop year — is configured as an instrument with its own book, tick table and session schedule. The receipt itself lives in a registry outside the engine, and the trade-capture record is what instructs the reassignment.
No. A Client Trading Front-End is bundled, so licensed brokers can participate from a browser on day one, with credentials bound to their firm. Firms that later want their own order-management system can integrate over the trading API or the FIX 4.4 gateway and remain subject to identical risk controls.
Yes. Session timetables are configured per market with per-instrument and per-day overrides, so a grade can trade daily in season and twice a week outside it, and a public holiday or a special auction is a calendar change made in the Control Panel rather than a deployment.
Silver, zinc and copper in physical lots — brokered by telephone today, at differentials nobody publishes.
Read the page →Commodities & industrialsrPET, rHDPE and secondary raw materials — obligated demand, fragmented supply, and no reference price.
Read the page →Precious metalsAn app that sells sub-gram quantities of gold to retail buyers, run as a real order book instead of a dealer’s quote.
Read the page →A live demonstration runs about an hour: the order book, the Control Panel, an auction uncrossing, and a replay of the journal that produced it.