Convert 100 Optimism (OP) to Arbitrum (ARB)

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

Amount

From

100 Optimism =

66.59424394 ARB −1.58% today

1 OP = 0.665942 ARB · 1 ARB = 1.50163 OP

Mid-market rate, updated 07:22 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: 1.24552
Change over the year: −60.07%

Conversion tables

OP to ARB
OP	ARB
1 OP	0.6659 ARB
10 OP	6.65942439 ARB
100 OP	66.59424394 ARB
1,000 OP	665.94243940 ARB
10,000 OP	6,659.42439400 ARB
50,000 OP	33,297.12197000 ARB
100,000 OP	66,594.24394000 ARB

ARB to OP
ARB	OP
1 ARB	1.50163128 OP
10 ARB	15.01631284 OP
100 ARB	150.16312836 OP
1,000 ARB	1,501.63128360 OP
10,000 ARB	15,016.31283600 OP
50,000 ARB	75,081.56418000 OP
100,000 ARB	150,163.12836000 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 100 OP in ARB?

100 Optimism is 66.59424394 Arbitrums at the mid-market rate of 4 October 2026, 07:22 UTC, when 1 OP = 0.665942 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, 1.24552 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.