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  2. ARB to OP

Arbitrum (ARB) to Optimism (OP)

Convert Arbitrums to Optimism at the live mid-market rate. Reverse: OP to ARB

1 Arbitrum =

1.50564661 OP +1.88% today

1 ARB = 1.50565 OP · 1 OP = 0.664166 ARB

Mid-market rate, updated 04:54 UTC. Paid plans update as often as every 60 seconds. Get ARB→OP rates via API

ARB to OP over the last year

0.501.001.50Nov ’25Jan ’26Mar ’26May ’26Jul ’26Sep ’26
52-week high
1.8372
52-week low
0.5690
52-week average
0.8577
Change over the year
+151.08%

Conversion tables

ARB to OP
ARB OP
1 ARB 1.50564661 OP
10 ARB 15.05646608 OP
100 ARB 150.56466079 OP
1,000 ARB 1,505.64660790 OP
10,000 ARB 15,056.46607900 OP
50,000 ARB 75,282.33039500 OP
100,000 ARB 150,564.66079000 OP
OP to ARB
OP ARB
1 OP 0.6642 ARB
10 OP 6.64166475 ARB
100 OP 66.41664749 ARB
1,000 OP 664.16647490 ARB
10,000 OP 6,641.66474900 ARB
50,000 OP 33,208.32374500 ARB
100,000 OP 66,416.64749000 ARB

Get ARB→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=ARB -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=ARB -d currencies=OP \
  -d date=2025-10-04 \
  -H "apikey: YOUR-API-KEY"

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Questions about ARB to OP

How much is 1 ARB in OP?

1 Arbitrum is 1.50565 Optimism at the mid-market rate of 4 October 2026, 04:54 UTC, and 1 OP is 0.664166 ARB.

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

Over the last 52 weeks 1 ARB ranged from 0.569033 to 1.83715 OP, 0.857732 OP on average.

Which exchange rate is this?

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