Convert 10 Old Sierra Leonean Leone (SLL) to Optimism (OP)

Convert old Sierra Leonean leones to Optimism at the live mid-market rate. Reverse: OP to SLL

The Old Sierra Leonean Leone is no longer in use

Old Sierra Leonean Leone (SLL) was replaced by the Sierra Leonean Leone (SLE) in 2022. For today’s money, convert SLE to OP.

Amount

From

10 old Sierra Leonean leones =

0.00324 OP +1.71% today

1 SLL = 0.00032399 OP · 1 OP = 3,086.52 SLL

Mid-market rate, updated 07:40 UTC. Paid plans update as often as every 60 seconds. Get SLL→OP rates via API

SLL to OP over the last year

52-week high: 0.00053319
52-week low: 0.00005811
52-week average: 0.00030170
Change over the year: +431.86%

Conversion tables

SLL to OP
SLL	OP
1 SLL	0.000324 OP
10 SLL	0.00324 OP
100 SLL	0.0324 OP
1,000 SLL	0.324 OP
10,000 SLL	3.23989100 OP
50,000 SLL	16.19945500 OP
100,000 SLL	32.39891000 OP

OP to SLL
OP	SLL
1 OP	3,086.52 SLL
10 OP	30,865.24 SLL
100 OP	308,652.36 SLL
1,000 OP	3,086,523.58 SLL
10,000 OP	30,865,235.80 SLL
50,000 OP	154,326,178.98 SLL
100,000 OP	308,652,357.97 SLL

Get SLL→OP rates via API

The live rate, the rate on any past day or a whole range, for OP and 170+ other currencies, as JSON. Free plan included. See the exchange rate API.

Get a free API key API documentation

curl https://api.currencyapi.com/v3/latest \
  -G -d base_currency=SLL -d currencies=OP \
  -H "apikey: YOUR-API-KEY"

# the rate on a past day
curl https://api.currencyapi.com/v3/historical \
  -G -d base_currency=SLL -d currencies=OP \
  -d date=2025-10-04 \
  -H "apikey: YOUR-API-KEY"

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Questions about SLL to OP

How much is 10 SLL in OP?

10 old Sierra Leonean leones is 0.00324 Optimism at the mid-market rate of 4 October 2026, 07:40 UTC, when 1 SLL = 0.00032399 OP.

What was the SLL to OP rate over the last year?

Over the last 52 weeks 1 SLL ranged from 0.00005811 to 0.00053319 OP, 0.0003017 OP on average.

Which exchange rate is this?

The mid-market rate: the midpoint between what currency markets pay and ask for SLL/OP, without the margin a bank or card issuer adds, so the rate you are charged is usually a little worse.