0x Protocol (ZRX) → Tether (USDT Optimism)

The order runs on autopilot: the rate is locked when you create it, and the payout leaves as soon as the network confirms your transfer. No manual approval, no working hours.

Rate and amounts for ZRX → USDT Optimism 1 ZRX = 0.121899 USDT Optimism 1 USDT Optimism = 8.2035 ZRX

Rate as of Sep 30, 2026 15:45

Orders from: 837.5208 ZRX ≈ $101.79
Payout network: Optimism
24 hours: −0.29%

You send

ZRX

You get 1,218.99

USDT Optimism

Create the order

Rate: 1 ZRX = 0.121899 USDT Optimism
From: 837.5208 ZRX
Up to: 82,300,000 ZRX

Preliminary figure: the final amount is locked in the order.

Current maths: 0.121899 USDT Optimism for every ZRX, and 8.2035 ZRX per USDT Optimism in reverse. Over 24 hours ZRX/USDT Optimism came in at minus 0.29%. Over the week, minus 4.42%.

The weekly range ran from 0.116096 to 0.129693 USDT Optimism, a spread of 11.71%. One order takes from 837.5208 to 82,300,000 ZRX. In dollars that is roughly $101.79.

The robot sends the payout in the Optimism network, so the address has to belong to that network — a transfer to another one will not arrive. Market capitalisation puts 0x Protocol at No. 284 ($103.1 M) and Tether at No. 3 ($183.8 B). Over 90 days the daily moves of ZRX and USDT correlate at 0.03 (they travel apart).

Which network USDT arrives in

The same USDT goes out in several networks. Each has its own rate and its own floor, and the fee is charged by the network itself.

Network	Per 1 ZRX	From	Network fee	Speed
Ethereum (ERC20)	0.121899	837.5208 ZRX	≈ $0.041	medium
TRON (TRC20)	0.121899	837.5208 ZRX	≈ $2.3	fast
BNB Smart Chain (BEP20)	0.121899	837.5208 ZRX	≈ $0.0025	fast
Solana	0.121899	837.5208 ZRX	≈ $0.0006	fast
Arbitrum One	0.121899	837.5208 ZRX	≈ $0.0036	fast
Avalanche C-Chain	0.121899	837.5208 ZRX	≈ $0.0036	fast
NEAR	0.121899	837.5208 ZRX	—	—
Optimism open	0.121899	837.5208 ZRX	≈ $0.00019	fast

ZRX → USDT: all networks side by side Network charges for USDT

Rate and amounts for ZRX → USDT Optimism

Send ZRX — receive USDT OptimismNeed USDT Optimism — send this much ZRX

ZRX	USDT Optimism
1,000	121.8988
5,000	609.4939
10,000	1,218.99
50,000	6,094.94
100,000	12,189.88
500,000	60,949.39

USDT Optimism	ZRX
200	1,640.71
1,000	8,203.53
2,000	16,407.05
10,000	82,035.27
20,000	164,070.55
100,000	820,352.75

How the ZRX → USDT Optimism exchange runs

Work out the amount in the calculator — orders start at 837.5208 ZRX.
Give a USDT address on Optimism and a contact for the order.
Send ZRX on 0x Protocol, exactly the amount the order shows.
Nothing else is needed from you: as soon as the network confirms the transfer, the robot sends Tether to your address. The order page shows the status.

Swap ZRX for USDT Optimism

Check this before sending ZRX

The address network is Optimism. Sending through another network almost always means losing the transfer.
The transfer must not be smaller than 837.5208 ZRX.
Copy the address in full, then check its first and last characters once it is pasted.
Send exactly the amount stated in the order: the automation matches your payment against it, and any difference sends the order back for recalculation.

How the ZRX to USDT Optimism rate has moved

WeekMonthQuarterYear

high 0.129693 USDT Optimismlow 0.116096 USDT Optimism

Sep 23, 2026 15:46Sep 30, 2026 15:46

high 0.127877 USDT Optimismlow 0.0936107 USDT Optimism

Aug 30, 2026 05:00Sep 29, 2026 05:00

high 0.127877 USDT Optimismlow 0.0747394 USDT Optimism

Jul 1, 2026 05:00Sep 29, 2026 05:00

high 0.261703 USDT Optimismlow 0.0747394 USDT Optimism

Oct 1, 2025 05:00Sep 29, 2026 05:00

24 hours: −0.29%
Week: −4.42%
Weekly high: 0.129693 USDT Optimism
Weekly low: 0.116096 USDT Optimism
Spread: 11.71%

Market data from CoinGecko as of Sep 30, 2026 15:27. The exchange rate is worked out separately and differs from the market one. How these numbers are counted

The ZRX/USDT Optimism spread by period

Period	High	Low	Middle	Period result
24 hours	0.123392	0.118902	0.120811	−0.29%
Week	0.129693	0.116096	0.122829	−4.42%
Month	0.127877	0.0936107	0.109145	+23.99%
Quarter	0.127877	0.0747394	0.0930198	+53.78%

Figures are in USDT Optimism per unit of the currency you send, taken from market data.

Daily ZRX → USDT Optimism rate

Day	Close	Against the day before
Sep 29, 2026	0.119395 USDT Optimism	−5.01%
Sep 28, 2026	0.125691 USDT Optimism	−1.71%
Sep 27, 2026	0.127877 USDT Optimism	+1.21%
Sep 26, 2026	0.126353 USDT Optimism	+4.22%
Sep 25, 2026	0.121239 USDT Optimism	+3.51%
Sep 24, 2026	0.117124 USDT Optimism	−4.36%
Sep 23, 2026	0.12246 USDT Optimism	+2.64%

Market data: ZRX and USDT

0x Protocol ZRX

Price: $0.121532
24 hours: −0.3%
Week: −3.25%
Market cap: $103.1 M
24-hour turnover: $4.38 M
Rank by cap: #284
In circulation: 848.4 M ZRX
All-time high: $2.50

Tether USDT

Price: $0.999608
24 hours: −0.01%
Week: −0.02%
Market cap: $183.8 B
24-hour turnover: $55.82 B
Rank by cap: #3
In circulation: 183.87 B USDT
All-time high: $1.32

Source: CoinGecko, Sep 30, 2026 15:27.

0x Protocol and Tether: how they differ

	0x Protocol (ZRX)	Tether (USDT)
Ticker	ZRX	USDT
In circulation	848.4 M ZRX	183.87 B USDT
Market cap	$103.1 M	$183.8 B
Rank by cap	#284	#3
Type	—	token
Network	—	Optimism
Fees are paid in	—	ETH
Launched	—	2014
Built by	—	Tether Limited
Supply cap	—	no cap

Daily moves of ZRX and USDT over the quarter link at 0.03 (they travel apart).

Why people take the ZRX → USDT Optimism route

Stepping out of the swingsZRX moved +23.95% over the past month. USDT tracks the dollar, so after the swap the amount stops following ZRX.
It works both waysThe USDT Optimism → ZRX direction is open as well — going back into ZRX takes the same route and the same automation.

Common questions: ZRX → USDT Optimism

What rate does ZRX to USDT Optimism run at?

As of Sep 30, 2026 15:45 it is 1 ZRX = 0.121899 USDT Optimism. The figure updates on its own, and the calculator always shows the current one. On the market that is around $0.121851.

What amounts does ZRX → USDT Optimism accept?

From 837.5208 to 82,300,000 ZRX per order. The floor is roughly $101.79.

Why can I not swap less than 837.5208 ZRX?

The network fee and the handling do not depend on the amount. On a transfer below 837.5208 ZRX they eat a noticeable share of it, and the swap stops making sense for either side.

Is anything charged on top of the rate?

No. The payout is already worked out at the rate in the calculator. Separately you pay only the network fee for sending ZRX, and the blockchain takes that one.

How long does swapping ZRX for USDT Optimism take?

The clock starts with confirmations: as soon as 0x Protocol confirms your transfer, the order goes out for payout with no operator involved. After that the timing is set by how busy the network is — which is the difference between quick and instant.

Which network will USDT Optimism arrive in?

The payout goes out on Optimism. Check that the receiving wallet supports that network.

Which network is cheaper for receiving USDT?

Usually USDT BEP20, USDT SOL, USDT Arbitrum, USDT AVAX C, USDT Optimism works out cheaper. Still, the network is picked by what the recipient accepts, not by the fee.

What happens if the rate moves while I am paying?

Nothing: the rate is locked in the order and holds for as long as the order is alive. It is recalculated only if the payment arrives late or for a different amount — so send the exact sum, and send it promptly.

What did the ZRX to USDT Optimism rate do over the month?

Over the month, plus 23.99%: a low of 0.0936107, a high of 0.127877, an average of 0.109145 USDT Optimism per 1 ZRX.

Can I swap back, USDT Optimism for ZRX?

Yes, the reverse is open too: 1 USDT Optimism = 8.2034 ZRX. The link to switch sits under the calculator.