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Liskov Service Credits and Payments Policy

Version 1.0 — effective 1 September 2026
Business customers only

This Policy forms part of the Liskov Contract between Customer and MOOSE LABS LTD trading as PROOF (PROOF). Capitalised words have the meanings in the Master Business Terms.

1.1 What a Service Credit is​

A Service Credit is a non-transferable contractual unit in Customer’s Workspace representing:

(a) a payment on account for Eligible Services supplied by PROOF;

(b) a promotional allowance; or

(c) a service adjustment or refund recorded as a credit.

The console may display Credits using USD or another reference currency for convenience. A reference denomination does not make Credits legal tender or give Customer ownership of currency or cryptoassets held by PROOF.

1.2 Closed use​

Credits may be used only by the Customer that acquired them, within the relevant Workspace, for Eligible Services supplied by PROOF. They cannot be:

  • transferred to another customer or Workspace without PROOF’s written approval for a genuine corporate reorganisation;
  • sold, traded, pledged, assigned or exchanged;
  • used to pay a Network Participant, Marketplace publisher or other third party;
  • withdrawn through an ATM, wallet or payment account;
  • used to send value to another person; or
  • represented by a freely transferable token.

1.3 No financial product​

Credits are not promoted or supplied as an investment, deposit, savings product, security or means of earning a return. They do not accrue interest or appreciate by reference to a market. PROOF does not provide investment, tax or financial advice.

1.4 No trust or safeguarding​

Unless a separately signed Order expressly says otherwise following legal review, money received for Credits is PROOF’s asset and is not held on trust, segregated or safeguarded for Customer. Customer has no beneficial interest in a specific bank account, wallet, token or reserve. On PROOF insolvency, an unused paid Credit balance would ordinarily be an unsecured contractual claim, subject to applicable law.

2. Acquiring Credits​

2.1 Methods​

Customer buys Credits through the checkout hosted by PROOF’s payment provider, using the payment methods shown there. PROOF does not accept cryptoassets as payment. Availability of a payment method may vary by country, plan and compliance status. PROOF may impose minimum and maximum purchase amounts and balance limits.

2.2 When Credits are issued​

Credits are added only after PROOF’s payment provider confirms the payment and PROOF completes reasonable fraud and compliance checks. A pending authorisation, a failed or reversed payment, or a payment to an incorrect account does not create Credits. VAT collected with a purchase is never converted into Credits.

2.3 Pricing and conversion​

Checkout states the USD value of Credits to be issued, the price, and the tax that applies. Credits are denominated in US dollars. A quote expires at the end of the checkout session.

2.4 Promotional Credits​

Promotional Credits:

  • have no cash value;
  • may be limited to specified Services;
  • may expire on the date shown when granted;
  • are consumed before or after paid Credits as stated in the promotion;
  • are not refundable; and
  • may be cancelled where obtained through error, fraud, duplicate accounts or breach of promotion terms.

A promotion does not amend paid-Credit rights unless expressly stated.

2.5 Errors​

Customer must notify PROOF promptly of an apparent ledger error. PROOF may correct a manifest error, duplicate entry, chargeback, reversed payment or fraudulent issue. PROOF will give reasonable detail and an opportunity to dispute a non-urgent correction.

3. Using Credits​

3.1 Eligible Services​

The pricing page, Order or console identifies Eligible Services and the rate or method by which Credits are consumed. PROOF may distinguish Subscription Fees, Launch Fees, Network Costs and other usage.

3.2 Authorisation​

Customer authorises consumption of Credits when an Authorised User launches, schedules, configures or continues an Eligible Service. Customer is responsible for permissions and spending controls within its Workspace.

3.3 Estimates​

A pre-Launch estimate is not a fixed quote unless expressly labelled as one. Actual Network Costs may vary with execution time, capacity, protocol fees, gas, retries and final settlement. PROOF will respect a hard spending cap that the Services explicitly confirm, except for a disclosed de minimis settlement overrun or already-committed non-cancellable cost outside PROOF’s reasonable control.

3.4 Order of consumption​

Unless the console states otherwise, Credits are consumed in this order:

  1. promotional Credits that expire first;
  2. other promotional Credits;
  3. paid Credits, oldest first; and
  4. service-adjustment Credits.

PROOF may use a different disclosed order where necessary for tax/accounting or a promotion.

3.5 Committed Credits​

Credits become Committed when PROOF has irreversibly or non-cancellably committed corresponding capacity, token spend or third-party cost for Customer. Committed Credits are treated as used for refund purposes even if Customer later cancels the workload, unless PROOF recovers the underlying cost.

3.6 Negative balances​

PROOF does not intentionally extend credit merely because the ledger becomes negative. Customer must pay a negative balance caused by authorised use, final Network settlement, reversal or chargeback. PROOF may suspend further use until it is paid.

4. Auto top-up​

4.1 Express instruction​

Where PROOF offers auto top-up, it is disabled unless an authorised Customer administrator enables it and selects or confirms:

  • trigger balance;
  • top-up amount;
  • payment method;
  • maximum amount or number of top-ups per billing period, where offered; and
  • notification destination.

Enabling it is a standing payment instruction until disabled.

4.2 Notifications and controls​

PROOF will show the settings in the console and send a receipt for each top-up. Customer may disable auto top-up for future charges. Disabling does not reverse an already initiated payment or committed cost.

4.3 Failed top-up​

If a top-up fails, PROOF may pause Launches, allow an authorised limited overrun, or charge the payment method again as disclosed. PROOF is not obliged to continue an unfunded workload.

5. Expiry​

5.1 Paid Credits​

Paid Credits do not expire while Customer maintains an active account in good standing, unless an Order clearly states a longer-dated enterprise allocation or legal/tax requirements require another treatment. After termination they are handled under section 6.

5.2 Promotional Credits​

Promotional Credits may expire on the disclosed date. PROOF will not shorten a stated promotional expiry retrospectively except to correct fraud or manifest error.

5.3 Dormant accounts​

Where an account has had no login, payment or Service use for 24 months, PROOF may contact Customer and require account verification. PROOF will not forfeit paid Credits merely for dormancy without at least 90 days’ notice and a lawful basis. It may deduct a reasonable, previously disclosed administration cost only where permitted by the Order and law.

6. Refunds and closure​

6.1 No routine cash withdrawal​

Credits are intended to be consumed for Services, not withdrawn on demand. Customer has no general right to convert an active balance into cash. Refunds are not automatic: PROOF considers refund requests case by case through support@proof.computer.

6.2 Refund events​

Subject to this section, PROOF will refund unused and uncommitted paid Credits where:

(a) PROOF permanently discontinues the relevant Eligible Service and does not offer a reasonable substitute;

(b) PROOF terminates Customer’s account or the Services other than for Customer breach, sanctions restriction or legal prohibition; or

(c) Customer validly terminates for PROOF’s uncured material breach.

PROOF may, at its discretion and case by case, refund unused paid Credits where Customer closes its account in good standing, requests a refund and completes verification, provided the refundable balance exceeds the reasonable cost of making the refund.

No refund is due for promotional Credits, consumed Credits, Committed Credits, current-period Subscription Fees, third-party costs already incurred, or amounts obtained through fraud/error.

6.3 Deductions and set-off​

PROOF may deduct:

  • unpaid Fees, taxes and negative balances;
  • chargebacks or reversed payments;
  • non-recoverable card, bank and payment-provider charges directly associated with the refund;
  • amounts PROOF is legally required to withhold; and
  • a reasonable recovery cost for an exceptional unsupported transfer requested by Customer.

PROOF will not impose an undisclosed arbitrary forfeiture fee.

6.4 Refund method​

PROOF refunds to the original payment method through its payment provider or, where that is not possible, to another verified method in Customer’s name.

6.5 Sanctions, fraud and disputes​

PROOF may delay or refuse a refund to the extent making it would breach law, sanctions, a court/regulator direction or a reasonable fraud investigation. PROOF will not use this clause to retain value arbitrarily and will communicate what it lawfully can.

6.6 Timing​

After receiving all required verification, PROOF will use reasonable efforts to process a valid refund within 14 Business Days, subject to payment-provider time and legal restrictions. This is a processing target, not a guarantee of bank settlement.

7. Chargebacks and reversals​

Customer must not initiate a chargeback for an undisputed valid charge. If a payment is charged back, reversed or found fraudulent after Credits are issued, PROOF may remove corresponding unused Credits, set off the amount, invoice Customer, suspend Services and recover reasonable costs. PROOF will reinstate amounts where Customer’s dispute succeeds.

8. Tax, records and statements​

8.1 Tax​

Prices exclude VAT and similar taxes unless stated. PROOF's VAT registration number is GB311456142. UK VAT is charged at the applicable rate where Customer’s billing address is in the United Kingdom, whether or not Customer is VAT-registered. A supply to a business customer with a billing address outside the United Kingdom is outside the scope of UK VAT; Customer accounts for any tax due in its own country, including under a reverse-charge mechanism where one applies. Tax is calculated at checkout by PROOF’s payment provider from the billing address and any VAT number Customer supplies, and the tax point for a Credit purchase is the purchase. Invoices and receipts show the subtotal, VAT and total and carry PROOF’s VAT number; PROOF issues credit notes where required. Customer is responsible for its own tax treatment of the Services and of any self-custody arrangement.

8.2 Ledger​

The console ledger is prima facie evidence of Credit acquisition, commitment, consumption, adjustment and refund, but Customer may show manifest error. PROOF will retain transaction records for the period required by tax, accounting, fraud and legal obligations.

8.3 Statements​

Customer should download statements it needs. PROOF may change display formats while retaining material underlying records during the required retention period.

9. Changes​

PROOF may change this Policy under the Master Terms. A change will not retrospectively remove the value of valid paid Credits, but it may change future purchase methods, eligible Services or consumption rates on the notice required by the Contract.

10. Conflict​

If this Policy conflicts with the Master Business Terms, the Master Business Terms prevail. An Order may vary this Policy only by expressly identifying the clause varied.

MOOSE LABS LTD trading as PROOF · Version 1.0 · effective 1 September 2026 · previous versions are archived by PROOF and available on request from legal@proof.computer.