Stablecoins from OP Mainnet (Optimism) to Ethereum: USDC Optimism → DAI

The direction runs at 1.0028 DAI per USDC Optimism, or 0.997191 USDC Optimism per DAI. Market over 24 hours: USDC Optimism against DAI plus 0.01%. The week added a move of 0%.

The weekly corridor ran from 0.999454 to 1.0002 DAI, a spread of 0.07%. A single order takes 200 to 10,000,000 USDC Optimism. In dollars that is roughly $199.91.

By market cap USD Coin sits 6th ($73.6 B) and Dai 22th ($4.57 B).

Who takes the USDC Optimism → DAI route

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

USDC Optimism → DAI rate and amounts

1 USDC Optimism = 1.0028 DAI

1 DAI = 0.997191 USDC Optimism

Send USDC Optimism — receive DAI

USDC Optimism	DAI
200	200.5634
1,000	1,002.82
2,000	2,005.63
10,000	10,028.17
20,000	20,056.34
100,000	100,281.7

Need DAI — send this much USDC Optimism

DAI	USDC Optimism
500	498.5954
1,000	997.1909
5,000	4,985.95
10,000	9,971.91
50,000	49,859.54
100,000	99,719.09

How the USDC Optimism → DAI order runs

Work out the amount in the calculator: orders start at 200 USDC Optimism.
Enter a DAI address in Dai 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, Dai leaves for your address. The order page tracks every step.

Swap USDC Optimism for DAI

Check this before sending USDC Optimism

The address network is Dai. 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 Ethereum.
To move DAI 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 Ethereum

	OP Mainnet (Optimism)	Ethereum
Network type	L2, optimistic rollup	Layer one (L1)
Fees are paid in	ETH	ETH
Fee level	≈ $0.00017	≈ $0.026
Speed	fast	medium
Block	~2 sec	~12 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)	—

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	DAI in Ethereum	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 Ethereum	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	≈ 7 days for the official withdrawal from OP Mainnet (Optimism) to Ethereum
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) → Ethereum: all directions The Ethereum network

Where the USDC Optimism to DAI rate has been

Week

high 1.0002 DAIlow 0.999454 DAI

Sep 10, 2026 13:05Sep 17, 2026 13:05

24 hours: +0.01%
Week: 0%
Weekly high: 1.0002 DAI
Weekly low: 0.999454 DAI
Spread: 0.07%

Market data from CoinGecko as of Sep 17, 2026 11:54; the exchange rate is calculated separately and differs. Where these numbers come from

How far USDC Optimism/DAI travelled, by period

Period	High	Low	Middle	Net move
24 hours	0.999862	0.999454	0.999665	+0.01%
Week	1.0002	0.999454	0.9999	0%

Figures are in DAI per unit sent, from market data.

The numbers on USDC and DAI

USD Coin USDC

Price: $0.999551
24 hours: −0.01%
Week: 0%
Market cap: $73.6 B
24-hour turnover: $18.23 B
Rank by cap: #6
In circulation: 73.64 B USDC
Record price: $1.04

Dai DAI

Price: $0.999981
24 hours: −0.02%
Week: 0%
Market cap: $4.57 B
24-hour turnover: $320.11 M
Rank by cap: #22
In circulation: 4.58 B DAI
Record price: $1.22

Source: CoinGecko, Sep 17, 2026 11:54.

USD Coin against Dai

	USD Coin (USDC)	Dai (DAI)
Ticker	USDC	DAI
Type	token	token
Network	Optimism	—
Fees are paid in	ETH	—
Launched	2018	2017
Built by	Circle	MakerDAO
Supply cap	no cap	no cap
In circulation	73.64 B USDC	4.58 B DAI
Market cap	$73.6 B	$4.57 B
Rank by cap	#6	#22

Common questions: USDC Optimism → DAI

What rate does USDC Optimism to DAI run at?

As of Sep 17, 2026 13:03 it is 1 USDC Optimism = 1.0028 DAI. The figure recalculates on its own, and the calculator always shows the fresh one. In dollars that is around $1.00.

What amounts does USDC Optimism → DAI 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 DAI 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 DAI arrive, or a wrapper?

DAI is the standard DAI token in Ethereum — exactly what exchanges send when they withdraw into this network.

Do I need ETH to receive DAI?

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

What is wrong with the official OP Mainnet (Optimism) bridge?

The official withdrawal from OP Mainnet (Optimism) to Ethereum waits around seven days — that is the challenge period of an optimistic rollup. Here DAI arrives as soon as the order is processed.

Which network will DAI arrive in?

Dai leaves in its own Dai network — a plain DAI address is all you need.

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.

Can I go back, DAI to USDC Optimism?

Yes, the reverse direction is open: 1 DAI = 1.0052 USDC Optimism. The link sits right under the calculator.