Convert EXTRAon Optimism to B
Swap Extra Finance (EXTRA) on Optimism to BUILDon (B) at the best cross-chain rate. SwitchFi routes your EXTRA → B exchange across the top DEXs and bridges and settles straight from your wallet — non-custodial, no account, no sign-up.
EXTRA to B market data
| Metric | EXTRA · Optimism | B |
|---|---|---|
| Price | $0.004238 | $0.1676 |
| Market cap | $1.90M | $167.67M |
| 24h volume | $2,304 | $9.98M |
| 24h change | -2.21% | -7.58% |
| 7d change | +0.80% | +19.50% |
| 24h high / low | $0.004415 / $0.004209 | $0.1828 / $0.1668 |
| All-time high | $0.2879 | $0.7626 |
| Market cap rank | #2368 | #194 |
What is the EXTRA to B exchange rate?
At the current market price, 1 EXTRA ≈ 0.02528428 B, and 1 B ≈ 39.5503 EXTRA. The rate moves with the market; the exact amount you receive is quoted from live liquidity in your wallet before you sign.
BUILDon carries the larger market value of the two — $167.67M versus $1.90M for Extra Finance. On the overall leaderboard they sit at #2368 and #194 respectively. Over the past 24 hours EXTRA is -2.21% while B is -7.58%, so the EXTRA/B rate has moved in EXTRA's favour. Across the last 7 days the comparison reads +0.80% for EXTRA versus +19.50% for B. Daily turnover runs at $2,304 for EXTRA and $9.98M for B, so routed swaps between the two settle at market rates without moving the price. EXTRA currently trades 98.5% below its all-time high, while B sits 78.0% under its own peak.
EXTRA to B converter & price calculator
Indicative, based on current market prices. Get a live quote in the swap.
EXTRA / B conversion tables
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Indicative estimate — the exact amount is confirmed in your wallet at execution.
About Extra Finance and BUILDon
Extra Finance (EXTRA) is the #2368 cryptocurrency by market cap, worth $1.90M in aggregate. It is trading 98.5% below its all-time high of $0.2879. 448.97M EXTRA is circulating out of a hard cap of 1.00B EXTRA — about 45% of the eventual supply. Recent performance reads +0.80% over 7 days and -1.30% over the past month for EXTRA. Daily turnover comes to $2,304.
BUILDon (B) ranks #194 by market capitalisation at $167.67M. Compared with its $0.7626 all-time peak, it currently trades 78.0% lower. Of a maximum supply of 1.00B B, 1.00B B (100%) is already in circulation. Recent performance reads +19.50% over 7 days and +0.50% over the past month for B. Around $9.98M of B changes hands every 24 hours.
How to convert EXTRA to B
- 1 Enter the amount of EXTRA on Optimism you want to convert — the swap widget on this page is prefilled with the EXTRA → B pair.
- 2 Connect a compatible wallet: MetaMask, OKX, Trust Wallet, TokenPocket, TronLink, UniSat, Phantom and others.
- 3 Review the quoted route — the estimated and minimum amount of B you will receive, plus network, DEX and bridge fees, are all shown before you sign.
- 4 Confirm the transaction in your wallet and track the swap on the My transactions page until the funds arrive.
Other options to exchange B
Convert any other cryptocurrency from EXTRA
EXTRAOptimism → BTC
Bitcoin
EXTRAOptimism → ETH
Ethereum
EXTRAOptimism → USDTEthereum
Tether
EXTRAOptimism → BNB
BNB
EXTRAOptimism → XRP
XRP
EXTRAOptimism → USDCEthereum
USDC
EXTRAOptimism → SOL
Solana
EXTRAOptimism → TRX
TRON
EXTRAOptimism → FIGR_HELOC
Figure Heloc
EXTRAOptimism → ZEC
Zcash
EXTRAOptimism → HYPE
Hyperliquid
EXTRAOptimism → DOGE
Dogecoin
EXTRA to B FAQ
What is the EXTRA to B exchange rate?
Right now 1 EXTRA ≈ 0.02528428 B (and 1 B ≈ 39.5503 EXTRA). Rates update continuously from live market data; the exact amount you receive is quoted in your wallet before you sign.
How to swap, exchange or convert EXTRA to B on SwitchFi?
Enter the amount of EXTRA you want to pay, connect your wallet, review the quote and confirm. SwitchFi routes the swap across DEXs and bridges to the best EXTRA→B path — non-custodial, straight from your wallet.
Is the EXTRA to B swap instant?
Speed depends on the route: same-chain trades are near-instant, while bridged cross-chain paths usually complete in a few minutes. Progress is trackable the whole way.
Are there fees to convert EXTRA to B?
All costs — gas, DEX fees and any bridge fee — are included in the quote before you sign, along with the guaranteed minimum you'll receive. There are no account or custody charges.
Do I need an account to exchange EXTRA for B?
No account is needed. You connect a wallet, approve the swap and receive the funds directly — there is no registration or KYC step for on-chain swaps.
Market data by CoinGecko, cached server-side. Prices are informational — the exact swap rate is quoted at execution time.