Convert 1,000 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

1,000 old Sierra Leonean leones =

0.3297 OP +3.51% today

1 SLL = 0.00032971 OP · 1 OP = 3,032.96 SLL

Mid-market rate, updated 11:52 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: 0.00030171
Change over the year: +441.25%

Conversion tables

SLL to OP
SLL	OP
1 SLL	0.0003297 OP
10 SLL	0.003297 OP
100 SLL	0.03297 OP
1,000 SLL	0.3297 OP
10,000 SLL	3.29710700 OP
50,000 SLL	16.48553500 OP
100,000 SLL	32.97107000 OP

OP to SLL
OP	SLL
1 OP	3,032.96 SLL
10 OP	30,329.62 SLL
100 OP	303,296.22 SLL
1,000 OP	3,032,962.17 SLL
10,000 OP	30,329,621.73 SLL
50,000 OP	151,648,108.66 SLL
100,000 OP	303,296,217.32 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 1,000 SLL in OP?

1,000 old Sierra Leonean leones is 0.3297 Optimism at the mid-market rate of 4 October 2026, 11:52 UTC, when 1 SLL = 0.00032971 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, 0.00030171 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.