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  2. SLE to OP

Sierra Leonean Leone (SLE) to Optimism (OP)

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

1 Sierra Leonean Leone =

0.3371 OP 0.00% today

1 SLE = 0.337053 OP · 1 OP = 2.96689 SLE

Mid-market rate, updated 23:59 UTC. Paid plans update as often as every 60 seconds. Get SLE→OP rates via API

SLE to OP over the last year

0.200.40Nov ’25Jan ’26Mar ’26May ’26Jul ’26Sep ’26
52-week high
0.52570
52-week low
0.05795
52-week average
0.29787
Change over the year
+477.93%

Conversion tables

SLE to OP
SLE OP
1 SLE 0.3371 OP
10 SLE 3.37052823 OP
100 SLE 33.70528232 OP
1,000 SLE 337.05282320 OP
10,000 SLE 3,370.52823200 OP
50,000 SLE 16,852.64116000 OP
100,000 SLE 33,705.28232000 OP
OP to SLE
OP SLE
1 OP 2.97 SLE
10 OP 29.67 SLE
100 OP 296.69 SLE
1,000 OP 2,966.89 SLE
10,000 OP 29,668.94 SLE
50,000 OP 148,344.70 SLE
100,000 OP 296,689.40 SLE

Get SLE→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=SLE -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=SLE -d currencies=OP \
  -d date=2025-10-02 \
  -H "apikey: YOUR-API-KEY"

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Questions about SLE to OP

How much is 1 SLE in OP?

1 Sierra Leonean Leone is 0.337053 Optimism at the mid-market rate of 1 October 2026, 23:59 UTC, and 1 OP is 2.96689 SLE.

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

Over the last 52 weeks 1 SLE ranged from 0.0579497 to 0.525697 OP, 0.297865 OP on average.

Which exchange rate is this?

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