Convert 1 Optimism (OP) to Arbitrum (ARB)

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

Amount

From

1 Optimism =

0.6671 ARB −1.42% today

1 OP = 0.66706 ARB · 1 ARB = 1.49912 OP

Mid-market rate, updated 05:04 UTC. Paid plans update as often as every 60 seconds. Get OP→ARB rates via API

OP to ARB over the last year

52-week high: 1.75737
52-week low: 0.54432
52-week average: 1.24553
Change over the year: −60.00%

Conversion tables

OP to ARB
OP	ARB
1 OP	0.6671 ARB
10 OP	6.67060093 ARB
100 OP	66.70600933 ARB
1,000 OP	667.06009330 ARB
10,000 OP	6,670.60093300 ARB
50,000 OP	33,353.00466500 ARB
100,000 OP	66,706.00933000 ARB

ARB to OP
ARB	OP
1 ARB	1.49911531 OP
10 ARB	14.99115312 OP
100 ARB	149.91153121 OP
1,000 ARB	1,499.11531210 OP
10,000 ARB	14,991.15312100 OP
50,000 ARB	74,955.76560500 OP
100,000 ARB	149,911.53121000 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"

Related conversions

Popular Optimism conversions

Popular Arbitrum conversions

Questions about OP to ARB

How much is 1 OP in ARB?

1 Optimism is 0.6671 Arbitrums at the mid-market rate of 4 October 2026, 05:04 UTC, when 1 OP = 0.66706 ARB.

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, 1.24553 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.