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The Closed Loop / The rails
Desk 63 - the payment chain of custody

The money that must go back the way it came

A withdrawal is not a payment out of a balance. It is the reversal of the deposits that built it, rail by rail. This desk explains the rule that pairs every withdrawal to the deposits behind it - the four things it decides, the cap each rail carries, the arithmetic of splitting one request across several rails, and the routes left open when a rail has gone.

Rail stub
The rule
a rail may return only what it paid in
The name
the destination must carry the account holder
The split
one request, one payment per rail
The dead rail
re-route, or the cap is unreachable
the railA payment method that has carried a completed deposit - not a method saved on the account
the capWhat a rail paid in, less what it has already returned, and never below zero
released moneyThe part of a balance above every cap: payable, and travelling by the operator’s own route
Direct answerA closed loop means the money you take out must travel back along the rails that paid it in. Each rail may return at most what it deposited, and only to an account in your own name - so a withdrawal from a mixed account arrives as several payments, and money held behind a rail that has gone has to be re-routed.

Four decisions, one rule

The whole arrangement comes down to four questions, asked in this order every time a withdrawal is requested. Each one can stop a payment on its own, and each one is answered by the operator’s own withdrawal policy rather than by a rule a reader can appeal to a licence for.

Whose name is on the destination

The account that receives the money must carry the same name as the gambling account. A rail paid by somebody else cannot return the money - not because the payment failed, but because the name does not match.

Which rail the money must travel

A rail may only carry a withdrawal once it has carried a completed deposit. The test is a settled deposit, not a saved card: a rail with no completed deposit behind it has a cap of zero however long it has been on the account.

How much each rail may return

Each rail carries a cap - what it paid in, less what it has already paid back. Once a rail has returned its cap it cannot carry another withdrawal, so a large request is met by the next rail rather than by the first one alone.

What happens when the rail is gone

A closed bank account, an expired card and a dead wallet all leave a cap that exists on paper and cannot be paid. The money is not lost; it is unreachable until the operator re-routes it, and re-routing is where the delays and the fees sit.

Where every number on this desk comes from

No operator’s policy is quoted anywhere on this site. Six invented samples carry the arithmetic, and every other figure is derived from them. They are small enough to re-derive by hand, which is the point: a reader can check the mechanism without trusting a number.

S1 - the two-rail account

200.00 arrived by card and 240.00 by bank transfer, so 440.00 of cap exists. The balance is 500.00 after a 60.00 win, and the whole 500.00 is requested back.

S2 - the partial withdrawal

30.00 by card and 70.00 by e-wallet, with 40.00 requested back and 60.00 left in the account - the case that separates a waterfall rule from a proportional one.

S3 - the verification deposit

A 10.00 deposit from a rail never used before, then a 400.00 request - the case that shows what a test deposit actually unlocks.

S4 - the dead rail

200.00 arrived by a card that expired fourteen months ago, and 200.00 is requested back - the case where the cap exists and the rail does not.

S5 - the third-party payer

150.00 arrived on a card in somebody else’s name, and the withdrawal stops at the name check - the case where the money has a working rail and the name rule still closes it.

S6 - the desk’s book

12,000 withdrawal requests against a mixed-rail book, of which 8,160 used one rail, 2,880 used two and 960 used three or more - the sample behind the split rates on this desk.

S1, worked: the whole 500.00 back from a 440.00 cappaid in 200.00 card + 240.00 bank = 440.00 of cap cap, card 200.00 paid in - 0.00 returned = 200.00 cap, bank 240.00 paid in - 0.00 returned = 240.00 requested = 500.00 looped min(500.00, 440.00) = 440.00 released 500.00 - 440.00 = 60.00 payments 200.00 to the card, 300.00 to the bank result one request, two payments, and the 60.00 of winnings is not labelled as such

That is the whole mechanism in four lines. The 500.00 did not leave the account as one payment because it never entered as one: it entered as a 200.00 payment on one rail and a 240.00 payment on another, and the loop returns each part to where it came from. The 60.00 above the caps is the only part that behaves like a fresh payment, and on the sample terms it travels on the operator’s default rail for released funds.

Why a reversal reads as a refusal

The mechanism is an accounting reversal, and it lands as a rejection. That gap is worth naming, because a reader who understands it stops arguing about the wrong thing - the person in the queue cannot release a cap that has no rail behind it, however sympathetic they are.

One pot in the reader’s head

A balance screen shows a single number, so the money in it is treated as one pool - the mental account most people keep. The rule keeps several pools, one per rail, and the two do not agree. The reader is told they have 500.00 and cannot move 60.00 of it; both statements are true, which is what makes the exchange feel like a trick.

A rule that reverses a receipt

A withdrawal that returns to the card it came from is a refund of a payment, not a payment out of a balance. Reframed that way it is unremarkable - nobody expects a refund to arrive somewhere the purchase never came from. Framed as a withdrawal it reads as the operator redirecting money, and the delay that follows reads as withholding rather than as the card rail’s own settlement clock.

Neither framing is a discovery about any operator. Both are reasons a reader’s first instinct - ask for it to be sent to the account that is convenient - is answered with a rule rather than a yes, and why the answer is usually accurate even when it sounds evasive.

What to ask instead. Not “can you send it to my bank”, which has one honest answer, but “which rails have capacity, how much is on each, and which one will the request reach first”. Those three are answerable from the payment history and from the withdrawal terms, and they are the questions that move the payment.

Why the loop exists at all

Three reasons, and they are worth separating because only one of them is about the reader. First, a card payment can be charged back by its issuer long after it settled, so an operator that has paid a card deposit out to a bank account is left holding a reversed payment it cannot recover. Second, a payment that leaves by a different route than it arrived is the shape a money-laundering pattern takes, so the loop is written into anti-money-laundering procedure and sometimes into the conditions attached to the operator’s licence. Third, a rail that has paid a deposit has already been verified once, at the reader’s own bank, which makes it cheaper to trust than a rail the operator has never seen.

The loop is a policy, not a law. Nothing in this desk should be read as a rule a reader can cite. How strictly the loop is applied, which rail is tried first, whether a rail that has gone can be re-routed at all and what the re-route costs are all decisions the operator makes and publishes in its own terms. Two operators can run the same mechanism with opposite defaults.

What a reader can take away in one pass

Three things on this site are meant to be used rather than read, and all three can be produced from a payment history a reader already has.

The rails table

Which payment methods on an account can return money at all, which cannot and why. It answers the question before a request is made, in one screen.

Your own cap table

Four columns - the rail, what it paid in less what came back, the cap, and the rail’s state - built from the payment history and finished in a few minutes.

The prediction

How many payments the next withdrawal becomes, which rail closes first, and whether any part of the balance is released money with no rail behind it. A slow payment and a missing one stop looking alike.

How to use this desk

The pages run in the order the rule applies. Read the first two to learn the shape of the arrangement, the next four to work out what a specific account can actually return, and the last three to deal with a payment that has stopped moving.

The rails - what each one can take in, what it can return, and the cap it leaves behind
The railCan carry inCan returnThe cap it createsIts state
Carddeposits, up to the issuer’s own limitup to what it paid inwhat it paid inopen after one settled deposit
Bank transferdepositsup to what it paid inwhat it paid inopen after one settled deposit
E-walletdepositsup to what it paid inwhat it paid inopen after one settled deposit
Crypto addressdepositsto that same address onlywhat it paid inopen while the address is retained
Prepaid voucherdepositsnothing at allnoneclosed: no return path exists
Card since expirednothing furthernothingwhat it paid in, unreachablegone: re-route only
The rule in one lineany rail may pay inonly a rail that paid may pay outthe cap is what it paid inand only in the holder’s name
One of the six rails cannot return anything at all. A prepaid voucher is accepted as a deposit by most operators and creates a cap that no rail can reach, because there is no destination behind it to pay. A card that has since expired is the same problem from the other direction: the cap exists and the rail does not.
The allocation - the same 40.00 request, met by two published rules, and what each one moves
The railPaid inShare of depositsWaterfall: oldest firstProportionalDifference
Card30.0030.0012.00+18.00
E-wallet70.0010.0028.00−18.00
Both rules100.00 in100.0%40.0040.0018.00 moves between the rails
Both columns pay 40.00 and both respect every cap. What differs is which rail is left with capacity: under the waterfall the card is spent and the wallet keeps 60.00; under the proportional rule the card keeps 18.00 and the wallet keeps 42.00.