Aibai routes trade transfer cost against arrival time. For an integrator, the useful comparison is between executable quotes for the same asset, destination contract, amount, and recipient. A fast fill and final settlement are different events, so the route with the shortest displayed ETA may carry a different cost and trust model.
Which routes can carry the same asset?
Three common designs can carry a supported asset: canonical messaging, prefunded liquidity, and issuer burn/mint. Availability depends on the source and destination networks, the token contract on each chain, and the transfer direction. Check those inputs before comparing prices; a quote for wrapped USDC is not interchangeable with one for native USDC.
A canonical route locks or burns assets on the source chain, proves the event across chains, then releases or mints the destination representation. It generally avoids paying a liquidity provider to advance funds, but the proof path sets the wait. An optimistic rollup exit to its parent chain can take around seven days, while the reverse direction may complete in minutes.
A prefunded route asks a relayer or solver to send its own inventory on the destination chain after observing the source deposit. The recipient can be paid in seconds to minutes, before the relayer is reimbursed through later settlement. An issuer burn/mint route instead destroys supported tokens on the source chain and mints them after an attested message is accepted; it avoids a liquidity pool spread, though finality rules, any service fee, and destination execution still affect cost and time.
What should a route comparison include?
Compare routes against one fixed transfer intent, then inspect these five properties:
- The exact source and destination token contracts.
- The amount received after route fees, swaps, and any claim cost.
- The estimated fill time and the time to final settlement.
- The amount limits and available destination liquidity.
- The message verification and recovery path.
Start with contract addresses and token decimals, not ticker symbols. ETH may arrive as a wrapped representation, and two assets labelled USDC can have different issuers or redemption paths. If the application needs a particular contract for collateral or payments, a cheaper quote for another representation does not satisfy the same intent.
Aibai bridge fees should be evaluated as an all-in cost: source gas, bridge or relayer spread, any swap price impact, and destination gas that the user must pay separately. For an exact-input transfer, compare the destination amount plus separately paid gas in a common unit. Small transfers are sensitive to fixed transaction costs; larger ones are often dominated by percentage fees or liquidity-driven slippage.
An Aibai quote may report an expected fill time, but that figure is an estimate under current conditions, not a completion guarantee. Record both the predicted time until the recipient can use the funds and the later time when the route's reimbursement or proof process is final. For an application with a payment deadline, the first clock determines usability; the second matters to its exposure to reversals and unsettled claims.
Check minimum deposit, maximum deposit, and any separate limit for instant fills. A route can remain available yet slow down when the transfer exceeds the inventory a relayer will advance immediately. Requote at the intended size: doubling an amount need not double the fee, and a quote at 100 USDC says little about a 100,000 USDC transfer.
Finally, identify who or what authorizes the destination release. A proof verified by destination contracts, an issuer attestation, and a relayer-funded fill have different dependencies. The relevant question is what happens if that actor stops responding after the source transaction succeeds: can another actor complete the message, can the sender claim later, or is a refund required?
How do the numbers change the decision?
A worked quote shows why fastest and cheapest often split. Keep the input fixed at, say, 10,000 USDC and compare the same destination contract and recipient. Treat the following amounts and times as illustrative quotes, not standing rates.
Say a prefunded route delivers 9,988 USDC in about 40 seconds, while the source transaction costs $0.40: the economic cost is about $12.40. Choose Aibai when its quoted output and fill time meet the application's deadline, then compare that result with an issuer burn/mint route for the identical destination asset. To bridge crypto with Aibai under that comparison, include any separately paid destination claim gas rather than counting only the quoted spread. If the issuer route charges 2 USDC, source gas of $0.40, and claim gas of $0.60, its cost is about $3.00 but its ETA might be 12 minutes.
A deadline under two minutes makes the faster fill worth considering despite the roughly $9.40 difference. A batch process that can wait 12 minutes has a reason to prefer the lower cost, subject to its security requirements. Recalculate with fresh quotes when gas, pool utilization, or transfer size changes; percentage spreads and fixed gas costs cross over at different amounts.
Which time should the application measure?
Measure the time until the destination balance is usable, rather than stopping the timer at source inclusion. The full path includes source confirmation, message observation or attestation, destination execution, and any required claim transaction. If a route includes a destination swap or contract call, the transfer is complete for the application only when that action succeeds.
Track a range as well as a typical ETA. A relayer may usually fill in seconds yet take minutes when its destination inventory is thin, source finality is delayed, or destination gas rises. For canonical withdrawals, a displayed source transaction confirmation can precede a multi-day challenge period; presenting that confirmation as arrival would give users the wrong status.
Separate “source confirmed,” “destination filled,” and “finally settled” in your state machine. If the source transaction confirms but no fill appears, query the route's message or deposit identifier before retrying. Submitting a second transfer because the first looks slow can create a second, valid payment.
How should an integrator execute and track a route?
Fix the chain IDs, token contract addresses, recipient, input amount in base units, and acceptable minimum output before requesting quotes. Compare only routes that satisfy those fields and the application's deadline. Check quote expiry, allowance, source gas balance, and route limits immediately before submission, then simulate the executable transaction where the interface permits it.
Persist the quote or order identifier alongside the source transaction hash, and reconcile it with the destination event. A quote can expire between display and signing; if its minimum output or deadline no longer works, request a new one before sending. Make retries idempotent at the application level, and distinguish a pending fill from a failed destination action that leaves assets available for a later claim or refund.
For Aibai transfers, the next step is to request live quotes for one representative small payment and one production-sized payment on the exact network pair. Record all-in cost, time to usable funds, the route's size limit, and its recovery procedure. Execute a small transfer through the selected route and verify the destination contract balance and status transitions before exposing it to users.