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  2. OP to ARB

Optimism (OP) to Arbitrum (ARB)

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

1 Optimism =

0.6633 ARB −1.97% today

1 OP = 0.66331 ARB · 1 ARB = 1.50759 OP

Mid-market rate, updated 03:45 UTC. Paid plans update as often as every 60 seconds. Get OP→ARB rates via API

OP to ARB over the last year

0.501.001.50Nov ’25Jan ’26Mar ’26May ’26Jul ’26Sep ’26
52-week high
1.75737
52-week low
0.54432
52-week average
1.24552
Change over the year
−60.22%

Conversion tables

OP to ARB
OP ARB
1 OP 0.6633 ARB
10 OP 6.63309770 ARB
100 OP 66.33097703 ARB
1,000 OP 663.30977030 ARB
10,000 OP 6,633.09770300 ARB
50,000 OP 33,165.48851500 ARB
100,000 OP 66,330.97703000 ARB
ARB to OP
ARB OP
1 ARB 1.50759124 OP
10 ARB 15.07591241 OP
100 ARB 150.75912414 OP
1,000 ARB 1,507.59124140 OP
10,000 ARB 15,075.91241400 OP
50,000 ARB 75,379.56207000 OP
100,000 ARB 150,759.12414000 OP

Get OP→ARB rates via API

The live rate, the rate on any past day or a whole range, for ARB 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=OP -d currencies=ARB \
  -H "apikey: YOUR-API-KEY"

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

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Questions about OP to ARB

How much is 1 OP in ARB?

1 Optimism is 0.66331 Arbitrums at the mid-market rate of 4 October 2026, 03:45 UTC, and 1 ARB is 1.50759 OP.

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

Over the last 52 weeks 1 OP ranged from 0.544321 to 1.75737 ARB, 1.24552 ARB on average.

Which exchange rate is this?

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