0.10 lot of EUR/USD is not 0.10 lot of USD/JPY

Lots first, margin later

MEXC's EURUSD CFD, checked on November 2, 2026, has a contract size of 100,000, a minimum order of 0.01 lot and a quantity step of 0.01 lot. One lot is 100,000 euros of exposure:

• 1.00 lot = 100,000 EUR
• 0.10 lot = 10,000 EUR, about $11,000 at a hypothetical 1.1000
• 0.01 lot = 1,000 EUR

Typing 0.10 in the quantity box means 0.10 lot, not ten cents and not $100. The step also explains a common rejection: 0.015 lot fails because it is not a multiple of 0.01.

The pip formula

Pip value in the quote currency = lots x contract size x pip size.

For EUR/USD a pip is 0.0001, and USD is the quote currency, so the answer is already in dollars:

• 1.00 lot: $10 per pip
• 0.10 lot: $1 per pip
• 0.01 lot: $0.10 per pip

Watch the decimals. A five-decimal quote moving from 1.10000 to 1.10001 is a tenth of a pip, often shown as a point. A 20-pip stop is 200 points. If an order field asks for a price, type the price and check it; do not assume it wants pips.

A full round trip, hypothetical prices

Buy 0.10 lot with the bid at 1.1000 and the ask at 1.1002. The spread is two pips, so closing instantly at an unchanged bid shows a $2 loss before anything has moved. That is the spread, not a fee.

Close later at a bid of 1.1032. The gain runs from your entry fill (1.1002) to your exit fill (1.1032): 30 pips, $30. Measuring bid to bid would show 32 pips and overstate the result by $2, because you never bought at the bid. Since the $30 already reflects the spread, do not subtract the spread a second time when you reconcile; only separate commissions and swap belong on top.

Plan a stop at 1.0982 and the price-based loss from the 1.1002 fill is 20 pips: $20 at 0.10 lot, $2 at 0.01 lot. That is an estimate, not a cap. A gap or fast market can fill you worse.

For a short, flip the sides. You open at the bid and close at the ask. A 0.10-lot short opened at 1.1000 and closed at an ask of 1.0975 makes 25 pips, $25. Because a short closes with a buy, a stop can trigger even when a bid-based chart never touched your level.

When USD is the base

USD/JPY also has a 100,000 contract size on MEXC, but now the units are dollars and the quote is yen. A pip is 0.01, so 0.10 lot = 0.10 x 100,000 x 0.01 = 100 yen per pip. At a hypothetical 150 yen per dollar that is about $0.67, not the $1 you got on EUR/USD. A 0.10-lot short from 150.000 to 149.700 earns 3,000 yen. Same lot, different dollar sensitivity.

CFD funds move over from Spot as USDT and convert 1:1 into USDx, the internal unit for CFD margin and settlement. A shared settlement unit is not a shared risk unit: convert every result before comparing two trades.

Two more traps. Long and short positions on the same instrument can stay open independently, so opening a sell does not close your buy; close the position itself. And a long EUR/USD plus a short USD/JPY is not diversification. Both carry USD exposure and both gain if the dollar weakens.

The same arithmetic on perps

Crypto perpetuals use the identical structure under different labels. At 10:28 AM ET today, MEXC's BTC_USDT perpetual had a contract size of 0.0001 BTC and a 0.1 price tick, with $BTC.USDT at 77,937.8 and funding at 0.01% per 8-hour interval. So 1,000 contracts = 0.1 BTC, and every $100 move in BTC is $10 on that position. $ETH.USDT contracts are 0.01 ETH (2,291.54, funding 0.0034% per 8h), $SOL.USDT contracts are 0.1 SOL (94.38, funding 0.01% per 8h), $XRP.USDT contracts are 1 XRP at 1.2539, and $DOGE.USDT contracts are 100 DOGE at 0.07547. A contract count means nothing until you multiply by contract size, exactly like lots.

Before any order: open the symbol's Info section, read contract size, minimum quantity and step, convert to units, then price one pip or one tick in your account currency. If that number surprises you, the position is the wrong size.