Understanding option pricing
Before the numbers: what currency protection is, what sets its price, and why currencies in frontier markets need a different approach to pricing.
What protection is
Protection on BlockFinaX works like an option. The buyer pays a fee today, the premium, and in return is paid if the exchange rate moves past an agreed level, the strike, by an agreed date, the expiry. The payout stops growing at a second level, the limit.
An example. A Ghanaian importer must pay a supplier 100,000 dollars in 30 days. Today one dollar costs 11.20 cedis, so the bill is 1,120,000 cedis. If the cedi weakens to 12.50, the same bill costs 1,250,000 cedis: 130,000 cedis more, enough to wipe out the profit on the shipment.
The importer buys a USD/GHS Up cover that pays if the rate ends above 11.60. If the cedi weakens, the payout covers most of the extra cost. If it does not, the importer has spent only the premium, like an insurance policy that was not needed.
| Term | Meaning | In the example |
|---|---|---|
| Up cover | Pays when the rate rises above the strike | Cover against the cedi weakening |
| Down cover | Pays when the rate falls below the strike | Cover against the rate falling |
| Strike | Where the payout starts | 11.60 cedis per dollar |
| Limit | Where the payout stops growing | 12.50 cedis per dollar |
| Expiry | When the outcome is measured | 30 days from today |
| Premium | What the buyer pays today | Set by the pricing below |
What sets the price
The fair price of protection is the payout you would expect on average, across every way the rate could move, valued in today's money. Six things decide it.
| Element | What it is | When it goes up, protection costs |
|---|---|---|
| Today's rate compared with the strike | How far the rate must move before anything is paid | More, as today's rate gets closer to the strike |
| Time to expiry | How long the rate has to move | More: more time, more room to move |
| Volatility | How much the rate typically swings | More: bigger swings, more chance of a payout |
| Drift | Which way the rate tends to move | More for an Up cover when the currency tends to weaken |
| Jump risk | The chance of a sudden large move, such as a devaluation | More: sudden moves are what protection pays on |
| The limit | Where the payout stops growing | More, as the limit moves further from the strike |
Option pricing deliberately avoids forecasts. It works out what it would cost to cover the payout, using the market's own information wherever it exists, which is why two banks given the same inputs arrive at the same price.
Developed, emerging and frontier markets
Investors commonly group markets as developed, emerging or frontier; index providers such as MSCI and FTSE Russell publish their own classifications, which differ and change over time. For currency protection, what matters is how much market information exists to price with.
| Developed | Emerging | Frontier | |
|---|---|---|---|
| Currency examples | Euro, pound, yen | South African rand, Brazilian real, Indian rupee | Ghanaian cedi, Nigerian naira, Kenyan shilling |
| Options market | Deep: banks quote prices all day | Exists, thinner | Little or none |
| Forward market | Deep | Often traded offshore | Thin, sometimes missing |
| How the rate moves | Mostly smooth | Smooth with occasional shocks | Long calm spells broken by sudden steps |
| Volatility for pricing | Read from option prices | Read from option prices, with gaps | Must be estimated from history |
| Who offers protection | Many banks | Fewer banks, larger clients | Very few providers; most businesses cannot get it |
Frontier currencies can lose a large share of their value against the dollar within a single year. Businesses there carry the most currency risk, yet have the fewest ways to protect against it.
Why the standard method needs adapting
Banks price currency options with the standard market method. Every input comes from live markets: today's rate from a recognised fixing, the expected path of the rate from the forward market, and volatility from the options market itself. In frontier markets the forward and options markets are thin or missing, so each gap needs a substitute.
| Standard input | The frontier problem | What the pricing uses instead |
|---|---|---|
| Volatility from option prices | No options market to read it from | Volatility from the rate's own history, with a safety margin and a minimum for the market type |
| Expected path from the forward market | No reliable forward market | The currency's own five-year trend |
| Smooth price moves | Moves come in sudden steps | An added allowance for sudden jumps |
| Clean, frequent data | Thin and sometimes stale data | Quotes refused when data is too old or a price looks unrealistic |
| A bank stands behind the payout | Few providers | The maximum payout is locked when protection is bought |
The BlockFinaX approach
The pricing uses standard, published models, the same family banks use, so anyone can check it. What is new is what surrounds them:
- Frontier-ready inputs. Each missing market input has a documented substitute, so currencies with no options market can still be priced.
- Fully backed. Every contract's maximum payout is set aside from the underwriters who back it when it is bought, so the payout never depends on a promise to pay later.
- Open underwriting. Anyone with capital can underwrite protection and choose their own terms.
- Rule-based settlement. The payout follows a published formula and an agreed rate, and is paid in USDC.
- Accessible sizes. Businesses can protect amounts that banks would usually turn away.
Next: Pricing model explains how the fair price is calculated. Developers can find the full methodology, every formula and its references in Pricing methodology.