How to Buy BNB Attestation Service (BAS)
Every exchange we track that lists BAS, what the buy costs, and what it costs to take BAS with you afterwards.
13 of the exchanges we track list BAS, and 13 of those accept fiat, so you can buy it without holding crypto first. The cheapest place to place the order is KCEX at $0.00 on a $1,000 market buy. It is also the cheapest once the withdrawal fee is added — $0.04 to buy $1,000 of BAS and move it to your own wallet. BAS moves over 2 networks (BNB Smart Chain (BEP20), Ethereum (ERC20)) — pick the same one on the exchange withdrawal screen and in your wallet. 1 of them has BAS withdrawals paused right now — you can buy there, but you cannot take the coin with you until it reopens.
Networks BAS runs on
Where to buy BAS
All-in cost is the trading fee on a $1,000 market buy plus the cheapest fee that exchange charges to withdraw BAS. It is the number the exchange’s own “how to buy” page never shows you, and it reorders the table more often than not. The coins column is how many assets each exchange lists in total, from our own sync — not the figure CoinMarketCap prints.
| Exchange | Buy fee on $1,000 | Move it out | All-in cost | Coins listed | Buy |
|---|---|---|---|---|---|
 MEXCReferralPay with Card | $0.500–0.05% taker | $0.14065 BAS · BNB Smart Chain (BEP20) | $0.64 | 9,475 | Visit ↗ |
 GateReferralPay with Card | $1.000.1% taker | $0.534419.01 BAS · BNB Smart Chain (BEP20) | $1.53 | 2,059 | Visit ↗ |
 KCEXPay with Card, 3rd-party | $0.000% taker | $0.037391.33 BAS · BNB Smart Chain (BEP20) | $0.04 | 908 | Visit ↗ |
 OurbitPay with Bank | $0.000% taker | $0.084343 BAS · BNB Smart Chain (BEP20) | $0.08 | 1,980 | Visit ↗ |
 KuCoinPay with Card | $1.000.1% taker | $0.843430 BAS · BNB Smart Chain (BEP20) | $1.84 | 2,147 | Visit ↗ |
 CoinExPay with P2P, 3rd-party | $2.000.2% taker | $0.010400.3700 BAS · BNB Smart Chain (BEP20) | $2.01 | 1,018 | Visit ↗ |
 DigiFinexPay with Card, P2P | $2.000.2% taker | $0.056232 BAS · BNB Smart Chain (BEP20) | $2.06 | 1,009 | Visit ↗ |
 ToobitPay with Card, Apple/Google Pay, 3rd-party | $1.000.1% taker | $1.4250.5557 BAS · BNB Smart Chain (BEP20) | $2.42 | 581 | Visit ↗ |
 XT.COMPay with Card, Bank, P2P | $2.000.2% taker | $0.590421 BAS · BNB Smart Chain (BEP20) | $2.59 | 1,110 | Visit ↗ |
 Biconomy.comPay with Card, P2P, 3rd-party | $1.000.1% taker | $1.6960 BAS · BNB Smart Chain (BEP20) | $2.69 | 990 | Visit ↗ |
 HibtPay with P2P | $2.000.2% taker | $2.81100 BAS · BNB Smart Chain (BEP20) | $4.81 | 1,721 | Visit ↗ |
 HitBTCCrypto deposit only | $2.500.1875–0.25% taker | $37.981,351 BAS · Ethereum (ERC20) | $40.48 | 1,786 | Visit ↗ |
 BitMartPay with Card, P2P, 3rd-party | $1.000.1% taker | withdrawals paused | — | 3,695 | Visit ↗ |
Showing 1–13 of 13 exchanges listing BAS
Buying BAS step by step
- Pick a venue from the table. For a coin this size the choice is usually short — 13 exchanges list BAS at all, and the table already shows what you will pay to leave as well as to buy.
- Fund the account. 13 of those exchanges take fiat, 9 of them by card. Card is fastest and dearest; a bank transfer costs a fraction of it. Depositing a stablecoin you already hold is free on almost every exchange here.
- Place the order. A market order pays the taker fee in the table; a limit order that rests on the book pays the lower maker fee. On a thinly traded coin the spread costs more than either, so a limit order is worth the wait.
- Decide whether to move it. Leaving BAS on the exchange is free but custodial. Moving it to a wallet that supports it costs one withdrawal fee, from $0.03739 — send a small test amount first, and match the network on both sides.
How to buy BAS — FAQ
Where can I buy BNB Attestation Service (BAS)?
On 13 exchanges we track: MEXC, Gate, KCEX, Ourbit, KuCoin and 8 more. The table above has each one with its trading fee, the payment methods it takes and what it charges to withdraw BAS.
What is the cheapest way to buy BAS?
KCEX, at $0.04 to buy $1,000 of BAS and withdraw it — $0.00 in trading fee plus $0.03739 to move it out over BNB Smart Chain (BEP20). If you are leaving the coin on the exchange, only the first half applies and a different venue may win. Paying by card adds the card processor's charge on top of both, typically 1.8–4%.
Can I buy BAS with a credit card?
Indirectly, yes. 9 of the exchanges listing BAS accept a card, but the card almost always buys a major asset — USDT, USDC, BTC — which you then swap for BAS on the same exchange. That means two fees: the card charge, then the trading fee in the table.
Do I have to pay a fee to withdraw BAS?
Yes, and it is worth checking before you choose where to buy. It is a flat amount of BAS, set by each exchange per network, so it does not scale with the size of your purchase — the cheapest in the table is $0.03739 on KCEX. Our full BAS withdrawal fee table compares every exchange and every network.
Is it safe to leave BAS on the exchange?
It is a custody choice, not a safety switch. While the coin sits there the exchange holds the keys: convenient, recoverable if you lose your password, and dependent on the exchange staying solvent and keeping withdrawals open. Moving it to a wallet you control removes that dependency and costs one withdrawal fee — from $0.03739 for BAS. For a trading balance, staying put is reasonable; for a long hold, most people move.
Which network should I use for BAS?
BAS is issued on 2 networks and they are not interchangeable — BAS sent over BNB Smart Chain (BEP20) will not arrive at an address on Ethereum (ERC20). BNB Smart Chain (BEP20) is the one most exchanges use (11 of them). Withdrawal fees differ per network too, sometimes by an order of magnitude, so the cheapest network is worth checking as well as the cheapest exchange.
Exchange coverage for BAS comes from each exchange’s own deposit and withdrawal endpoints (last sync 2026-08-29 00:53 UTC); trading fees are the published base tier, no volume discount applied (verified 2026-08-28). Exchanges we have a referral arrangement with appear first and are tagged as such — it changes no number in any row. Nothing here is investment advice; see our methodology.