How to Pay for AI APIs With ETH (And When You Should Not)

You cannot pay OpenAI, Anthropic, or Google for API access with Ether. None of them accept crypto in their billing settings. The working method is an OpenAI compatible gateway that takes ETH deposits, and on MixRoute that means one network: Ethereum mainnet.

That single network, plus one thing ETH has that stablecoins do not, makes this a different decision from depositing USDT or USDC. This guide covers the deposit flow, the gas question, and the honest case for using a stablecoin instead.

Quick answer

Fund an OpenAI compatible gateway with ETH on Ethereum mainnet, get one API key, and reach 200+ models through a single endpoint. No card, no KYC to start. There is one network and no cheaper route, so gas is a real consideration, and because ETH is volatile you are converting a price exposed asset into fixed dollar credit at the moment you deposit.

The thing that makes ETH different

Every other crypto option here is a dollar stablecoin. USDT, USDC, and PYUSD are all designed to hold a one to one dollar peg, so depositing them is a transfer, not a trade.

ETH is not pegged to anything. Its price moves, sometimes a lot.

What that means in practice. When you deposit ETH, it converts to API credit denominated in dollars at that moment’s rate. From that point on your balance is fixed in dollar terms. If ETH rises afterward, the credit does not rise with it. If ETH falls, your credit does not fall either.

Neither outcome is inherently bad. It is a decision rather than a mechanical transfer, and it is worth making deliberately rather than by accident.

Two ways to think about it.

If you hold ETH as a long term position and expect it to appreciate, spending it on operating costs means giving up that exposure. Many people in that position prefer to hold ETH and pay expenses from stablecoin.

If ETH is simply what you have, or you were going to sell some anyway to cover costs, depositing it directly is fine and saves you a conversion step and its associated fees.

One thing to be aware of. In many jurisdictions, spending a volatile asset is treated differently from spending a stablecoin for accounting and tax purposes. Rules vary widely by country and by circumstance, so if you are running this through a business, check with an accountant familiar with your jurisdiction rather than assuming it works the same way as a stablecoin transfer.

One network, so gas actually matters

ETH deposits run on Ethereum mainnet. That is the only option, which means there is no cheap chain to route around gas fees the way there is with USDT on Tron or USDC on Solana.

Why that matters more than it sounds. Ethereum gas is charged per transaction, not per dollar moved. Sending $50 of ETH and sending $5,000 of ETH cost roughly the same in gas. So the fee is negligible on a large deposit and can be a meaningful percentage on a small one.

The practical rule. ETH is a reasonable choice for a larger deposit where gas rounds to nothing. For a small top up, the fee may be a real fraction of what you are depositing, and a stablecoin on a cheaper chain will usually cost less to move.

Timing helps. Ethereum gas prices fluctuate with network demand, and the difference between a busy period and a quiet one is substantial. If your deposit is not urgent, checking gas conditions before sending and waiting for a quieter window is a legitimate way to reduce the cost. Any Ethereum gas tracker will show you current levels.

How to pay for AI APIs with ETH, step by step

Step 1: Create your account

Sign up with an email address. No identity document, no card, no business verification. New accounts include a starting credit, so you can test a model and confirm the flow works before depositing anything of your own.

Step 2: Select ETH on the deposit screen

Choose ETH (Ether) from the coin list. The deposit screen shows the network and the address.

Step 3: Confirm the network and check gas

ETH deposits are on Ethereum mainnet. Confirm what the deposit screen shows before sending.

This is also the moment to check current gas conditions, particularly if your deposit is modest. A few minutes of patience during a busy period can save a noticeable amount.

Step 4: Send to the deposit address

Copy the address rather than typing it. Never type a crypto address by hand.

On a first deposit, or a large one, send a small test amount, confirm it credits, then send the rest. On Ethereum this costs you a second gas fee, so weigh it against the size of the transfer. For a large deposit it is clearly worth it.

Step 5: Save the transaction hash and wait

Your wallet gives you a transaction hash when the transfer broadcasts. Save it, because until your balance updates it is your only proof the transfer happened and the only thing support can use to trace it.

Confirmation time on Ethereum depends on network conditions and the gas price you paid. A transaction sent with a low gas price during a busy period can sit pending for a while.

Step 6: Generate your API key and make a call

Create a key in the console and copy it once. Store it in an environment variable, never in client side code, and never commit it to a repository.

from openai import OpenAI

client = OpenAI(
    base_url="https://api.mixroute.ai/v1",
    api_key="YOUR_MIXROUTE_KEY",
)

response = client.chat.completions.create(
    model="claude-opus-4-8",
    messages=[{"role": "user", "content": "Say hello in one sentence."}],
)

print(response.choices[0].message.content)

Make sure the base URL ends in /v1. That trailing path is what tells the SDK it is talking to an OpenAI compatible server, and leaving it off is the most common setup mistake.

Switching models is a one string change. Same key, same base URL, different model ID from the catalog.

When ETH is the right choice, and when it is not

An honest split, because the answer genuinely depends on your situation.

ETH makes sense when:

• ETH is what you hold and you were going to convert some to cover costs anyway
• Your deposit is large enough that Ethereum gas is a rounding error
• Your funds already sit on Ethereum mainnet and moving them elsewhere would cost more than sending directly
• You operate onchain and holding stablecoins is not part of how you work

A stablecoin is the better choice when:

• You are making a small top up, where Ethereum gas is a meaningful percentage
• You want to keep your ETH position and pay expenses from something else
• You top up frequently, since repeated mainnet gas adds up
• You want the cheapest possible route, in which case USDT on Tron or Solana, or USDC on Solana, will beat ETH on cost every time

If you top up often, the arithmetic favours a stablecoin clearly. Ten small deposits on Ethereum mainnet means ten gas fees. Ten deposits of USDT on Tron costs a fraction of that in total.

If your ETH deposit does not arrive

Check the transaction first. Paste your transaction hash into Etherscan. If it shows as pending, it may simply need more time, particularly if you sent with a low gas price during a busy period. If it shows as confirmed and the funds reached the deposit address, contact support with the hash.

If you sent on a network other than Ethereum mainnet, the funds are generally unrecoverable, because the deposit address may not exist on the chain you sent to. Contact support with the hash regardless, but treat recovery as unlikely.

The USDT deposit guide has a fuller troubleshooting walkthrough that applies to crypto deposits generally.

Other ways to pay

ETH is one of several options. MixRoute also accepts:

• USDT on Ethereum, Arbitrum One, Polygon, Solana, TON Network, and Tron
• USDC on Ethereum, Arbitrum One, Polygon, and Solana
• PYUSD (PayPal USD) on Ethereum and Solana
• BTC on the native Bitcoin network, with Lightning support for smaller deposits
• Cards via Visa, Mastercard, and JCB

The full crypto payment guide covers every coin with its supported networks.

How the options compare

A 5% platform fee comes straight out of your usable credit. On a $10,000 deposit that is $500 that never becomes tokens. On a zero fee gateway your only cost is the on chain gas fee, which for ETH on a large deposit is a small fraction of the total.

FAQ

Can I pay for AI API access with ETH? Not with OpenAI, Anthropic, or Google directly, since none of them accept crypto. You can through an OpenAI compatible gateway that takes ETH deposits. On MixRoute, ETH is accepted on Ethereum mainnet and converts to API credit you can spend across 200+ models with one key.

Which network does MixRoute support for ETH? Ethereum mainnet only. Unlike the stablecoins, which run on multiple chains, ETH has one route in, so there is no cheaper network to choose.

Does depositing ETH lock in the price? Yes. Your ETH converts to dollar denominated API credit at the rate when it credits. If ETH rises afterward your balance does not rise with it, and if ETH falls your balance is unaffected. This is the main difference from depositing a stablecoin, which is a straight transfer rather than a conversion.

Is ETH or a stablecoin better for funding API credits? A stablecoin is usually cheaper and simpler, because it runs on cheaper chains and involves no price conversion. ETH makes sense when it is what you hold, when your deposit is large enough that Ethereum gas is negligible, or when your funds are already on mainnet. For small or frequent top ups, a stablecoin on a cheap chain is the clear choice.

How much does it cost to deposit ETH? Beyond the gas fee, nothing on MixRoute, since there is no platform fee on deposits. Ethereum gas varies with network demand and is charged per transaction rather than per dollar moved, so it is negligible on a large deposit and a meaningful percentage on a small one. Checking a gas tracker before sending can reduce it.

Does paying with ETH require KYC? Not on MixRoute. You start with an email, fund with ETH, and generate an API key without submitting identity documents.

Are there tax implications to paying with ETH? Possibly, and they differ from paying with a stablecoin, because ETH is a volatile asset rather than a dollar equivalent. Rules vary by jurisdiction and circumstance, so consult an accountant familiar with your situation rather than assuming it is treated the same way.

Do I pay a markup on models versus going direct? No markup on tokens. You pay the same per token rate you would pay the provider directly. The difference is one key and one bill instead of several separate accounts, plus automatic failover when a provider has problems.

Do my credits expire? No. MixRoute credits have no expiration regardless of how you funded them.

The bottom line

You can fund AI API credits with ETH, on Ethereum mainnet, with no KYC and no platform fee. It works and it is straightforward.

Whether you should is a different question. ETH is the only volatile asset among the crypto options here, so depositing it converts price exposure into fixed dollar credit, and it runs on the single most expensive network with no cheaper route available. That combination makes it a good fit for large deposits from people who already hold ETH on mainnet, and a poor fit for small or frequent top ups.

If your priority is cost, a stablecoin on a cheap chain beats ETH every time. If ETH is what you have, this works fine.

MixRoute accepts ETH alongside USDT, USDC, PYUSD, Bitcoin, and cards. One OpenAI compatible API, 200+ models, credits that never expire. Start building on MixRoute