Stablecoins from OP Mainnet (Optimism) to Arbitrum One: USDC Optimism → USDT Arbitrum

Q: What rate does USDC Optimism to USDT Arbitrum run at?

As of Sep 17, 2026 16:53 it is 1 USDC Optimism = 1.0006 USDT Arbitrum. The figure recalculates on its own, and the calculator always shows the fresh one. In dollars that is around $0.999775.

Q: What amounts does USDC Optimism → USDT Arbitrum accept?

From 200 to 10,000,000 USDC Optimism per order. The lower limit is roughly $199.91.

Q: Where does the 200 USDC Optimism floor come from?

Network fees and order handling eat a small transfer alive — below 200 USDC Optimism the swap stops making sense for either side.

Q: What else is taken on top of the rate?

The payout is already calculated at the rate in the calculator. On top of it you only pay the network fee for sending USDC Optimism, and that one goes to the blockchain, not to us.

Q: How long does USDC Optimism to USDT Arbitrum take?

The clock starts with confirmations: the order goes into work once Optimism confirms your transfer. After that it comes down to how busy the network is. A block in Optimism closes in about 2 sec.

Q: Will native USDT arrive, or a wrapper?

USDT Arbitrum is the standard USDT token in Arbitrum One — exactly what exchanges send when they withdraw into this network.

Q: Do I need ETH to receive USDT Arbitrum?

Not to receive. ETH comes into play later, when you want to send USDT from your address.

Q: Which network will USDT Arbitrum arrive in?

The payout leaves in Arbitrum One. Make sure the receiving wallet works with that network.

Q: Where is receiving USDT cheaper?

The cheapest is usually USDT BEP20, USDT SOL, USDT Polygon, USDT Arbitrum, USDT TON, USDT AVAX C, USDT Optimism. Still, the network is chosen by what the recipient supports, not by the fee.

Q: What if the rate moves while I am paying?

The rate is pinned to the order and does not move while the order is alive. It can be recalculated if the payment arrives late or for a different amount — so send the exact sum, and send it promptly.

The direction runs at 1.0006 USDT Arbitrum per USDC Optimism, or 0.9994 USDC Optimism per USDT Arbitrum. Market over 24 hours: USDC Optimism against USDT Arbitrum plus 0.01%. The week added plus 0.02%.

The weekly corridor ran from 1 to 1.0004 USDT Arbitrum, a spread of 0.04%. A single order takes 200 to 10,000,000 USDC Optimism. In dollars that is roughly $199.91.

The payout leaves in the Arbitrum One network, so the receiving address has to belong to that network. By market cap USD Coin sits 6th ($73.56 B) and Tether 3th ($183.29 B). Daily moves of USDC and USDT over 90 days line up at 0.16 (they travel apart).

Who takes the USDC Optimism → USDT Arbitrum route

A road both waysThe USDT Arbitrum → USDC Optimism direction is open too, so going back into USDC takes the same route.

USDC Optimism → USDT Arbitrum rate and amounts

1 USDC Optimism = 1.0006 USDT Arbitrum

1 USDT Arbitrum = 0.9994 USDC Optimism

Send USDC Optimism — receive USDT Arbitrum

USDC Optimism	USDT Arbitrum
200	200.12
1,000	1,000.6
2,000	2,001.2
10,000	10,006
20,000	20,012
100,000	100,060

Need USDT Arbitrum — send this much USDC Optimism

USDT Arbitrum	USDC Optimism
500	499.7002
1,000	999.4004
5,000	4,997
10,000	9,994
50,000	49,970.02
100,000	99,940.04

Payout network for USDT

The same USDT goes out in several networks. Rates and lower limits differ, and the fee is charged by the network itself.

Network	Per USDC Optimism	From	Network fee	Speed
OMNI	1.0006	—	—	—
Ethereum (ERC20)	1.0006	200 USDC Optimism	≈ $0.055	medium
TRON (TRC20)	1.0006	200 USDC Optimism	≈ $2.3	fast
BNB Smart Chain (BEP20)	1.0006	200 USDC Optimism	≈ $0.0024	fast
Solana	1.0006	200 USDC Optimism	≈ $0.0005	fast
Polygon	1.0006	200 USDC Optimism	≈ $0.0018	fast
Arbitrum One open now	1.0006	200 USDC Optimism	≈ $0.0033	fast
TON	1.0006	200 USDC Optimism	low	fast
Avalanche C-Chain	1.0006	—	≈ < $0.0001	fast
NEAR	1.0006	—	—	—
Optimism	1.0006	—	≈ $0.00017	fast

USDT network fees

How the USDC Optimism → USDT Arbitrum order runs

Work out the amount in the calculator: orders start at 200 USDC Optimism.
Enter a USDT address in Arbitrum One and a way to reach you.
Send USDC Optimism in Optimism for exactly the amount stated in the order.
Once the network confirms your transfer, Tether leaves for your address. The order page tracks every step.

Swap USDC Optimism for USDT Arbitrum

Check this before sending USDC Optimism

The address network is Arbitrum One. Sending through another network usually means losing the transfer.
The transfer must not be smaller than 200 USDC Optimism.
Copy the address whole, then compare the first and last characters after pasting.
Ethereum, Arbitrum, Optimism, BNB Smart Chain and Polygon all use the same address shape (0x…). Make sure the wallet is switched to Arbitrum One.
To move USDT on later, put a little ETH at the same address.
Coins go through an AML check: a flagged transfer can be held until the check is finished.

OP Mainnet (Optimism) against Arbitrum One

	OP Mainnet (Optimism)	Arbitrum One
Network type	L2, optimistic rollup	L2, optimistic rollup
Fees are paid in	ETH	ETH
Fee level	≈ $0.00017	≈ $0.0033
Speed	fast	fast
Block	~2 sec	~0.25 sec
Address shape	0x…	0x…
Memo or tag	not needed	not needed
Ethereum-style address (0x…)	yes	yes
Official withdrawal to Ethereum	≈ 7 days (challenge period)	≈ 7 days (challenge period)

Fee and speed levels are comparative: both move with how busy the network is.

How this differs from a classic bridge

	RubyCash	Classic bridge
What lands at your address	USDT in Arbitrum One	The same stablecoin; turning USDT into USDC is a separate step
Wallet and signatures	Not needed: the coins go to the address from the order	Needed: connect the wallet and sign contract transactions
A coin for fees in Arbitrum One	Not needed to receive	Often needed, or the funds cannot be claimed or moved on
Timing	After confirmations in OP Mainnet (Optimism); the order page tracks it	Depends on the bridge and the load of both networks
Who holds the funds meanwhile	RubyCash for the life of the order, with an AML check	The bridge contract or its validators

Bridge OP Mainnet (Optimism) → Arbitrum One: all directions The Arbitrum One network

Where the USDC Optimism to USDT Arbitrum rate has been

WeekMonthQuarterYear

high 1.0004 USDT Arbitrumlow 1 USDT Arbitrum

Sep 10, 2026 16:56Sep 17, 2026 16:56

high 1.0004 USDT Arbitrumlow 0.999785 USDT Arbitrum

Aug 18, 2026 03:00Sep 17, 2026 03:00

high 1.0007 USDT Arbitrumlow 0.999785 USDT Arbitrum

Jun 19, 2026 03:00Sep 17, 2026 03:00

high 1.0032 USDT Arbitrumlow 0.998284 USDT Arbitrum

Sep 18, 2025 03:00Sep 17, 2026 03:00

24 hours: +0.01%
Week: +0.02%
Weekly high: 1.0004 USDT Arbitrum
Weekly low: 1 USDT Arbitrum
Spread: 0.04%

Market data from CoinGecko as of Sep 17, 2026 15:54; the exchange rate is calculated separately and differs. Where these numbers come from

How far USDC Optimism/USDT Arbitrum travelled, by period

Period	High	Low	Middle	Net move
24 hours	1.0004	1.0003	1.0004	+0.01%
Week	1.0004	1	1.0002	+0.02%
Month	1.0004	0.999785	1.0001	0%
Quarter	1.0007	0.999785	1.0003	0%

Figures are in USDT Arbitrum per unit sent, from market data.

Daily USDC Optimism → USDT Arbitrum rate

Day	Close	Against the day before
Sep 17, 2026	1.0004 USDT Arbitrum	+0.01%
Sep 16, 2026	1.0003 USDT Arbitrum	+0.03%
Sep 15, 2026	1 USDT Arbitrum	−0.01%
Sep 14, 2026	1.0002 USDT Arbitrum	+0.01%
Sep 13, 2026	1.0001 USDT Arbitrum	0%
Sep 12, 2026	1 USDT Arbitrum	−0.02%
Sep 11, 2026	1.0002 USDT Arbitrum	0%

The numbers on USDC and USDT

USD Coin USDC

Price: $0.999571
24 hours: −0.01%
Week: 0%
Market cap: $73.56 B
24-hour turnover: $18.85 B
Rank by cap: #6
In circulation: 73.59 B USDC
Record price: $1.04

Tether USDT

Price: $0.999175
24 hours: −0.02%
Week: 0%
Market cap: $183.29 B
24-hour turnover: $60.77 B
Rank by cap: #3
In circulation: 183.44 B USDT
Record price: $1.32

Source: CoinGecko, Sep 17, 2026 15:54.

USD Coin against Tether

	USD Coin (USDC)	Tether (USDT)
Ticker	USDC	USDT
Type	token	token
Network	Optimism	Arbitrum One
Fees are paid in	ETH	ETH
Launched	2018	2014
Built by	Circle	Tether Limited
Supply cap	no cap	no cap
In circulation	73.59 B USDC	183.44 B USDT
Market cap	$73.56 B	$183.29 B
Rank by cap	#6	#3

Daily moves of USDC and USDT over 90 days line up at 0.16 — they travel apart.

Common questions: USDC Optimism → USDT Arbitrum

What rate does USDC Optimism to USDT Arbitrum run at?

As of Sep 17, 2026 16:53 it is 1 USDC Optimism = 1.0006 USDT Arbitrum. The figure recalculates on its own, and the calculator always shows the fresh one. In dollars that is around $0.999775.

What amounts does USDC Optimism → USDT Arbitrum accept?

From 200 to 10,000,000 USDC Optimism per order. The lower limit is roughly $199.91.

Where does the 200 USDC Optimism floor come from?

Network fees and order handling eat a small transfer alive — below 200 USDC Optimism the swap stops making sense for either side.

What else is taken on top of the rate?

The payout is already calculated at the rate in the calculator. On top of it you only pay the network fee for sending USDC Optimism, and that one goes to the blockchain, not to us.

How long does USDC Optimism to USDT Arbitrum take?

The clock starts with confirmations: the order goes into work once Optimism confirms your transfer. After that it comes down to how busy the network is. A block in Optimism closes in about 2 sec.

Will native USDT arrive, or a wrapper?

USDT Arbitrum is the standard USDT token in Arbitrum One — exactly what exchanges send when they withdraw into this network.

Do I need ETH to receive USDT Arbitrum?

Not to receive. ETH comes into play later, when you want to send USDT from your address.

Which network will USDT Arbitrum arrive in?

The payout leaves in Arbitrum One. Make sure the receiving wallet works with that network.

Where is receiving USDT cheaper?

The cheapest is usually USDT BEP20, USDT SOL, USDT Polygon, USDT Arbitrum, USDT TON, USDT AVAX C, USDT Optimism. Still, the network is chosen by what the recipient supports, not by the fee.

What if the rate moves while I am paying?

The rate is pinned to the order and does not move while the order is alive. It can be recalculated if the payment arrives late or for a different amount — so send the exact sum, and send it promptly.

What did the USDC Optimism to USDT Arbitrum rate do this month?

The month came in at a move of 0%. Low 0.999785, high 1.0004, middle 1.0001 USDT Arbitrum per USDC Optimism.

Can I go back, USDT Arbitrum to USDC Optimism?

Yes, the reverse direction is open: 1 USDT Arbitrum = 0.9996 USDC Optimism. The link sits right under the calculator.