Terms of Service

Mast Finance Sàrl. Effective date: 22 October 2026. Version 1.0

English version. These Terms exist in French and in English, maintained together. In case of a difference between the two versions, the French version prevails (§24).

1. Scope and Acceptance

These Terms of Service ("Terms") govern access to and use of the Mast Finance cloud-based accounting and treasury software platform and related services (the "Service"), provided by Mast Finance Sàrl, a Swiss limited liability company registered under CHE-136.079.732, with registered address at Rue Centrale 15, 1003 Lausanne, Switzerland ("Mast Finance", "Mast", "we", "us").

The Service is intended exclusively for business customers (B2B). By accessing or using the Service, you confirm that you are acting on behalf of a legal entity and have authority to bind that entity to these Terms.

These Terms incorporate by reference:

2. Order of Precedence

In the event of conflict between documents, the following order of precedence applies:

Any signed Order Form provided by Mast Finance.
Data Processing Agreement.
These Terms of Service.
Referenced policies (Privacy Policy, AUP, Cookie Policy, Data Retention Policy, Refund and Cancellation Policy, Subprocessors).

Where no Order Form has been signed, precedence begins at the Data Processing Agreement and these Terms.

3. Description of the Service

3.1 What the Service does

The Service provides cloud-based tools including accounting support, invoicing, supplier and employee expense management, financial reporting, cash and treasury analytics, and related functionalities. Specific features depend on the subscription plan selected.

Mast Finance may add, modify, or discontinue features at any time, and will endeavour to provide reasonable advance notice of material changes.

Important: The Service does not submit filings, declarations, or returns to any regulatory or tax authority unless explicitly agreed in a separate written agreement.

3.2 Your right to use the Service

Mast Finance grants you, for the duration of your subscription, a non-exclusive, non-transferable right to use the Service for your business purposes (for a fiduciary or advisory firm, including the work it does for its clients through the Service), within the limits of your plan. Mast Finance and its licensors keep all rights in the Service, its software, its documentation and its trademarks. You may not copy, modify, decompile or reverse engineer the Service, make it available to third parties other than your authorised users, or use it to build a competing product, except to the extent the law allows despite this clause.

3.3 Feedback

If you send us suggestions or feedback about the Service, we may use them freely and without any obligation to you.

3.4 Third-party services, bank connections and payments

The Service can connect to services that third parties provide under their own terms, such as your bank, a payment provider, an e-commerce platform or an email provider. You connect them yourself, or we connect them for you at your request; either way the connection rests on your authorisation and on your own agreement with that provider, and you can withdraw it at any time. By connecting one, or asking us to, you authorise Mast Finance to exchange with it the data the connection requires. Mast Finance is not responsible for the availability, accuracy or terms of these services, nor for the consequences of a change they make to their interfaces, and may suspend a connection where its provider or security requires it. To end a connection completely, also revoke the authorisation you gave the provider (for example, at your bank).

Where the Service prepares payment orders or payment files, no payment is executed without your authorisation at your bank. Check each payment before you authorise it: you remain responsible for the payments your bank executes on your instructions.

3.5 Bank connection through bLink

Where you connect a bank account through bLink, the Swiss open banking platform operated by SIX BBS AG, Mast fetches that account's balance and booked transactions from your bank, regularly and on request, and records them in the Service as transactions of that account. Where the Service offers it, payment orders you prepare in it are sent to your bank through bLink; your bank executes them only once you have approved them in your e-banking (§3.4).

You give your consent to your bank, in its e-banking, through SIX's Consent-as-a-Service. The access token your bank then issues is kept by SIX on Mast's behalf, not by Mast, which keeps only a reference to it.

Mast uses these data only to provide the Service to you: it does not sell them, does not hand them to any third party for that party's own use, and uses them for no purpose of its own without your express consent. They are stored in Switzerland. Connecting a bank requires your express consent, given in a separate step of the connection, to the access and processing outside Switzerland that apply to these data: occasional access by Mast staff and contractors from the countries stated in §6.3; the Service's AI features, processed in the European Union; the sending of e-mail, from Ireland; the routing of the Service's traffic through a content delivery network, encrypted and without being stored, via the access point nearest to the user, which can be outside Switzerland, in particular when the user is abroad; and the AI assistance Mast staff use under §6.2, processed in the United States under a data processing agreement that incorporates the Standard Contractual Clauses, the provider not using the data to train its models. The providers concerned are listed on our Subprocessors page. You withdraw this consent by disconnecting the bank.

You can disconnect a bank at any time in the Service; Mast's access then ends at once. Within 24 hours of the disconnection, or of the end of the Service for your company, Mast has SIX delete the access token; it is up to you to also withdraw your consent in your e-banking. Transactions already imported stay in your books.

For fraud, a technical problem or a complaint about a bank connection, write to Mast support at support@mastfinance.io.

4. No Professional Advice

The Service does not provide legal, tax, accounting, financial, HR, or any other form of regulated professional advice. All outputs, reports, simulations, calculations, narratives, or recommendations generated by the Service:

are informational only and do not constitute professional advice;
require independent professional and human review before reliance;
must not be used as a substitute for qualified legal, tax, or financial advice.

You remain solely responsible for compliance with all applicable laws, regulations, and filing obligations.

5. Accounts and Security

You are responsible for:

all activities conducted under your account(s);
maintaining the confidentiality and security of credentials;
assigning appropriate access rights to authorized users only;
promptly notifying Mast Finance at contact@mastfinance.io of any unauthorized access or misuse.

Mast Finance is not liable for losses arising from your failure to maintain adequate account security.

6. Customer Data and Responsibility

6.1 Ownership and Licence

You retain all rights to data that you upload, input, or generate through the Service ("Customer Data"). You grant Mast Finance a limited, non-exclusive licence to process Customer Data solely as necessary to provide the Service and as described in the Data Processing Agreement.

You represent and warrant that:

you hold all necessary rights, consents, and lawful bases to provide Customer Data;
your use of the Service complies with all applicable laws;
Customer Data does not infringe the rights of any third party.

You are solely responsible for validating all outputs, statutory record-keeping, and ensuring the accuracy of Customer Data. Data rights and control over each tenant vest in the account holder (the legal entity that created the account, or for which a fiduciary firm opened it), acting through its account owner. Where a fiduciary, accounting or advisory firm (a "fiduciary firm") opened an account for a company, or holds it for that company until the company accepts it, that company is the account holder: its Customer Data and its books belong to it. A fiduciary firm's working papers follow §5.1 of the Data Processing Agreement.

A fiduciary firm that acts on behalf of a company through the Service, including by opening or holding its account, warrants to Mast Finance that it holds that company's authority to do so.

6.2 Support and Operational Access

Authorised Mast Finance staff, including contractors it engages on the terms described on our Subprocessors page, may access your tenant and your Customer Data, consult them and carry out operations in your tenant, to provide the Service, support, onboarding, data import, setup and the setting up of integrations, and to maintain and secure the Service. This access is limited to what those purposes require, and is subject to the following safeguards:

Staff access runs through controlled internal mechanisms, including a scoped staff session, in which staff may use the Service's screens as you see them and write data there, a proposal-and-approval flow, or, as a last resort, a logged raw-write session.
Staff are bound by confidentiality obligations no less protective than §11 of these Terms.
Every change staff make to your data is recorded in audit logs, as are their sessions in your tenant.
Where staff use AI assistance to help deliver support, onboarding, data import or setup, or to diagnose and maintain the Service, that processing runs with a provider listed on our Subprocessors page, in the country stated there, under a data processing agreement with that provider and, outside Switzerland and the European Union, the Standard Contractual Clauses; the provider does not use the data to train its models. It creates no data flow beyond those listed on that page.

This clause is the contractual basis on which Mast Finance staff may access a tenant for these purposes. It does not authorise access for any purpose other than providing, supporting, maintaining or securing the Service, or complying with a legal obligation.

6.3 Where Customer Data is stored

Customer Data is stored in Switzerland. Mast staff, like the contractors listed on the Subprocessors page, access it only from Switzerland or from a country that the Swiss Federal Council recognises as providing adequate data protection for all organisations there, such as the countries of the European Union, including when travelling, and from nowhere else. The Privacy Policy lists those countries. Apart from that access, it is processed outside Switzerland only where that page says so, and then only in the European Union, in a country recognised as providing adequate protection, or under the safeguards stated there. We announce a new subprocessor as the Data Processing Agreement provides, and you may object to it as it provides.

7. Automated and AI-Based Features

The Service may include automated, statistical, or AI-based features. You acknowledge that:

AI-generated outputs are probabilistic and may be incorrect, incomplete, biased, or outdated;
outputs are provided "as is" for informational purposes only;
you must not use AI outputs as the sole basis for decisions with legal, tax, or financial consequences;
you are responsible for all inputs and confirm you have the legal right to use such data;
Mast Finance does not guarantee uniqueness of AI-generated outputs.

Mast AI processes relevant data from your account on AI infrastructure operated by the providers listed on our Subprocessors page. Customer Data is stored in Switzerland, and AI inference runs in Switzerland or in the European Union, in regions covered by the Switzerland–EU adequacy decision. Neither the infrastructure provider nor the model providers use your inputs or outputs to train their models. By using the Service, you acknowledge that data relevant to your queries (including company names, amounts, and transaction summaries) may be processed by this infrastructure as described in our Privacy Policy and on our Subprocessors page.

Three uses of AI, three regimes. In every case described here, the models concerned are Mast Finance's own. The third-party providers whose models or services we use, listed on our Subprocessors page, are contractually barred from using your data to train or improve their models; nothing in this section creates an exception to that. (a) Running the Service. Mast Finance runs its own models, and the services of the providers listed on our Subprocessors page, on your Customer Data to provide the Service to you: document recognition, entry categorisation, reconciliation, anomaly detection, forecasting. This is the very purpose of the Service and requires no separate authorisation. (b) A model dedicated to you. Mast Finance may train, fine-tune, or parameterise a model of its own whose outputs benefit only your organisation. Such a model, its weights, and its derivatives are siloed to your organisation, are not made available to any third party, and are deleted together with your Customer Data. (c) The shared model improvement programme. This programme is not offered yet: until the authorisation described here can be given in the application, Mast Finance trains no shared model on your data. Mast Finance training its own models on examples drawn from your data, where the resulting improvements benefit its other customers, requires your organisation's express, optional authorisation, given in the application by an owner or administrator, disabled by default and deemed refused in its absence. Refusing or revoking it has no effect on your price, your features, or your Service. Where enabled, only training examples that have first been irreversibly anonymised are used: no names, no addresses, no account or identification numbers, and amounts reduced to orders of magnitude. What remains are patterns, not your accounting. Revocation takes effect immediately for all future extraction; examples already anonymised are, by that anonymisation, no longer personal data and are not affected. The authorisation, its version, its timestamp, and its author are recorded in your organisation's consent history.

8. Acceptable Use and Suspension

Your use of the Service is subject to the Acceptable Use Policy (AUP).

Mast Finance may suspend or restrict access, in whole or in part, where this is needed to prevent harm to the Service, to you or to others, to investigate a serious suspicion of misuse or of a breach of these Terms, to meet a legal obligation or an order of an authority, or for non-payment as set out in §9.7. Mast Finance limits a suspension to what its reason requires, tells you of it and of its reason, in advance where the circumstances allow, and lifts it once the reason is gone. While access is suspended, you keep the right to export your Customer Data, unless the reason for the suspension prevents it.

9. Fees, Billing, and Renewal

9.1 Plans and billing periods

Paid access is sold as a subscription to a plan. When you subscribe, you choose the plan and the billing period, either monthly or annual. The billing period you choose is the term of the subscription.

Negotiated plans (including practice and enterprise arrangements) are governed by the Order Form or written agreement signed for them. Where such a document exists, it prevails over this section.

9.2 Automatic renewal

Your subscription renews automatically at the end of each billing period for another period of the same length, and the renewal is charged to the payment method on file, at the price then in force for your plan and billing period. This continues until the subscription is cancelled.

For an annual subscription, we send a renewal reminder at least 7 days before the renewal date. Your payment history is available in your billing settings, where each invoice can be downloaded as a PDF.

9.3 Cancellation

You may cancel at any time from the billing settings in the application. You may also request cancellation by writing to contact@mastfinance.io from the account owner's address or that of an authorised administrator. No notice period applies.

Cancellation takes effect at the end of the current billing period: you keep access to paid features until that date, and no further renewal is charged. Fees already paid for the current period are not refunded. Mast Finance may grant a refund at its discretion in individual cases; see the Refund and Cancellation Policy.

After the paid period ends, the account enters the lifecycle described in §13 and in the Data Retention & Account Deletion Policy: your Customer Data remains readable and exportable for 30 days, personal data is anonymised at Day 30, and the remaining financial data is permanently purged from the Service at Day 90. Cancelling therefore starts that clock — export a complete copy of your Customer Data before it runs out. We send export reminders to the billing or contact address on the account around Day 20 and again around Day 25, but running the export remains your responsibility.

9.4 Taxes

Prices are shown and charged in Swiss francs, exclusive of VAT. Mast Finance Sàrl is registered for Swiss VAT (CHE-136.079.732 VAT). The VAT applicable to your subscription, determined by your country of establishment and your VAT status (Swiss VAT at the rate in force, 8.1% on the effective date of this version), is added to the displayed price and shown separately before you confirm any payment and on every invoice.

9.5 Price changes

We may change the price of a plan. A price change never affects the period you have already paid for. We will give you at least 30 days' written notice before a price change applies to a renewal of your subscription, so that you can cancel before it takes effect if you do not wish to continue.

9.6 Changes to your subscription

You may upgrade at any time; the upgrade takes effect immediately and the price difference for the remainder of the current period is charged on a pro-rata basis by our payment processor.

You may move to a lower plan where your usage allows it. Because plans carry limits (including the number of users), a change to a lower plan may require you to reduce usage first, and the application will tell you what must be reduced. A change to a lower plan takes effect at the end of the current billing period.

9.7 Failed payments and non-payment

If a renewal payment fails, our payment processor retries the charge and we notify you. If payment has still not succeeded after approximately seven days, your account becomes read only: you and your users keep access to your data, including export, but can no longer record new entries.

If the account is still unpaid thirty days after it became read only, we send a final written notice to the billing or contact address on the account.

If the account is still unpaid sixty days after it became read only, the subscription is cancelled. Your Customer Data then follows the lifecycle described in §13 and in the Data Retention & Account Deletion Policy: it remains recoverable and exportable for 30 days, personal data is anonymised at Day 30, and financial data is purged from the Service at Day 90.

You can restore full access at any point before cancellation by settling the outstanding amount.

9.8 Free and complimentary access

Mast Finance may grant free access to the Service, including beta access and access granted with an invitation code. Mast Finance decides freely whether to offer free access, its scope and its duration, and may change or end it at any time. No payment is taken for free access, and no refund arises from it. Free access is governed by §9.9.

9.9 Free trials and free tiers

Mast Finance may offer free trials, beta access, or free-tier plans at its discretion. During any free or trial period:

the Service is provided "as is": the commitment in §14 to remedy defects does not apply, and §12 applies;
Mast Finance may limit features, usage, storage, or support;
Mast Finance may terminate or modify free access at any time without liability;
all other provisions of these Terms apply, including data protection, acceptable use, and limitation of liability.

Upon expiry of a free trial, access to paid features will cease unless you subscribe to a paid plan. Customer Data then follows the same lifecycle described in §13 and in the Data Retention & Account Deletion Policy: it stays available for export during a grace period, personal data is anonymised at Day 30, and financial data is purged from the Service at Day 90.

9.10 Usage beyond your plan's allowance

Some features are measured, such as the AI used by Mast AI, and your plan includes an allowance of them each month. Once it is used up, the feature pauses until the next month, unless pay-as-you-go is switched on for your account: the feature then keeps working, and the use beyond the allowance is charged on your next invoice at the price stated for your plan. An owner or administrator switches pay-as-you-go on or off and sets its monthly maximum in the application. A new account starts with pay-as-you-go switched on and a maximum of CHF 20 a month, unless its plan states another. We never charge more than that maximum for a month: the feature pauses when it is reached. A change to the price of usage beyond the allowance follows §9.5.

9.11 Clients of a fiduciary firm

Where a fiduciary firm works with you through the Service, preferential terms may apply to your subscription under a separate agreement between that firm and Mast Finance. Your subscription may be paid by you or by that firm. Who pays may change by agreement between you and that firm; the change takes effect at a billing date.

10. License Compliance, Verification, and Misuse

10.1 Accuracy Obligation

You must provide accurate information relevant to pricing metrics, including number of users, legal entities, and company size.

10.2 Verification

Mast Finance may reasonably verify compliance with these Terms.

10.3 True-Up and Back-Billing

If underpayment or misuse is identified, Mast Finance may invoice retroactive fee differences, verification costs, and interest as permitted by Swiss law.

10.4 Material Breach

Intentional misrepresentation or circumvention of pricing metrics constitutes a material breach. Mast Finance may immediately suspend access, terminate the agreement, and pursue all available legal remedies.

11. Confidentiality

Each party keeps confidential the information of the other party that it receives in connection with the Service and that is marked as confidential or should reasonably be understood to be so, including Customer Data, business information and the terms of any Order Form ("Confidential Information"). It uses it only to provide or use the Service, protects it with at least the care it gives its own confidential information and never less than reasonable care, and discloses it only to its staff, contractors, subprocessors and professional advisers who need it for that purpose and are bound by equivalent obligations of confidentiality.

These obligations do not apply to information that is or becomes public without a breach of these Terms, that the receiving party already knew or developed independently, or that it lawfully receives from a third party without restriction. A party may disclose Confidential Information where the law, a court or an authority requires it, after telling the other party where it is allowed to.

These obligations continue for three years after the contract ends, and for Customer Data and trade secrets for as long as they remain confidential.

12. Availability and Maintenance

The Service is provided on an "as available" basis. Mast Finance operates it with reasonable care and endeavours to minimise disruption and to give advance notice of scheduled maintenance where practicable, but does not commit to any specific level of availability.

Availability targets, support response times, and any associated remedies such as service credits exist only where Mast Finance has agreed them in writing with a customer, in a signed Order Form or a separate service level agreement. Absent such a written agreement, no availability target, no support response time and no service credit applies.

Support is provided by email at contact@mastfinance.io.

13. Term and Termination

Except as provided in §10.4, either party may terminate for material breach not remedied within 30 days of written notice.

Mast Finance may end the Service, or stop offering it in a country, by telling you at least 90 days in advance. It then refunds, pro rata, the fees you paid in advance for any period after the end date, and your Customer Data follows the lifecycle below from that date, so that you can export it.

Where a fiduciary firm stops paying for or holding a company's account, the company keeps access to its account for a transitional period, whose length and terms Mast Finance states in the notice it sends the company. If, at the end of that period, neither the company nor a fiduciary firm pays for the account, the ordinary end-of-contract rules apply, including the lifecycle below.

Upon termination or account deletion, Customer Data follows the lifecycle set out in the Data Retention & Account Deletion Policy:

your access to the Service becomes read-only for 30 days, so that you can export your data, and then ends;
Day 0: account deletion is requested by writing to contact@mastfinance.io from the account owner's address. Before we confirm the deletion we offer you a complete export of your Customer Data, which you may decline in writing. A complete export can also be downloaded at any time before deletion via Settings > Data Export.
Grace period (Day 0 to Day 30): your data remains fully intact and the account can be recovered.
Day 30: individual personal data is anonymised and the tenant is archived; recovery is no longer possible.
Day 90: all tenant-scoped financial data is permanently purged from the Service. Only a minimal tenant record (company name and subscription metadata), cryptographic fingerprints of the audit trail (no content), and Mast's own Stripe billing records are retained, as required for Mast's 10-year bookkeeping obligation under CO Art. 958f.
Backups: encrypted disaster-recovery copies of the production database are kept apart from the Service for the period stated in the Privacy Policy, and may contain your data until they expire. They are used only to restore the Service after a disaster.

You remain responsible for retaining your own accounting records for the statutory period under Swiss law.

14. Quality of the Service and Warranty

Mast Finance provides the Service with the care that can be expected of a professional provider, in line with the state of the art, and remedies, within a reasonable time after becoming aware of them, reproducible defects that significantly impair the use of the Service. Mast Finance does not warrant that the Service will be uninterrupted or free of errors, or that it will meet needs it does not describe. Any further warranty, statutory or otherwise, is excluded to the extent permitted by law. Free, trial and beta access is provided as described in §9.9.

15. Limitation of Liability

15.1 Mast Finance is liable without limitation for damage it causes intentionally or through gross negligence.

15.2 For damage caused through slight negligence, and to the extent permitted by law:

Mast Finance is not liable for indirect or consequential damage, in particular lost profit, lost savings or loss of business, nor for claims made against you by third parties;
for lost or damaged data, its liability is limited to the reasonable cost of restoring the data from the most recent backup;
its total liability is limited to the greater of the fees you paid for the Service in the twelve months before the event giving rise to the claim, and CHF 500.

15.3 Mast Finance answers for the subcontractors and subprocessors it uses as for its own conduct, within the same limits.

15.4 Nothing in these Terms limits a liability that mandatory law does not allow to be limited.

16. Indemnification

You agree to indemnify Mast Finance from third-party claims arising from your Customer Data, misuse of the Service, or breach of these Terms.

17. Force Majeure

Neither party shall be liable for failure or delay caused by circumstances beyond reasonable control, including acts of God, war, pandemics, or failures of third-party infrastructure.

18. Assignment

You may not assign your rights without Mast Finance's prior written consent, except in connection with a merger or acquisition. Mast Finance may assign these Terms upon written notice.

19. Notices

Notices shall be given in writing by email. Notices to Mast Finance: contact@mastfinance.io. Notices to you: the email address associated with your account.

20. Changes to These Terms

20.1 Mast Finance may change these Terms where there is a reason to: a change in the law or in the position of an authority or a court, a new or changed feature or service, a technical or security development, a change of provider, or a change in our offer. Price changes follow §9.5.

20.2 We tell you of a change at least 30 days before it takes effect, by email to the account owner and in the application, saying what changes. A change the law requires at shorter notice takes effect when the law requires it. Corrections, clarifications and changes that are only in your favour may take effect when they are published.

20.3 If you do not accept a change, you may cancel your subscription before it takes effect, without any notice period (§9.3). If the change is materially to your disadvantage and you have paid in advance for a period that runs beyond the day it takes effect, you may instead end your subscription on that day, and we refund the fees paid for the rest of that period, pro rata.

20.4 If you keep using the Service after a change takes effect, the changed Terms apply. We update the version number and effective date at the top of this document on every change. The current version is always available at /terms, and earlier versions on request.

20.5 The Acceptable Use Policy, the Cookie Policy and the Privacy Policy may be updated at any time; the updated version applies from its publication. A change of subprocessor follows the Data Processing Agreement.

21. Governing Law and Jurisdiction

These Terms are governed by Swiss law, excluding its conflict-of-laws rules. The parties submit to the exclusive jurisdiction of the courts of Lausanne, Switzerland. The CISG is excluded.

22. Severability

If any provision is found invalid, it shall be modified to the minimum extent necessary or severed. The remaining provisions continue in full force.

23. Waiver

No failure or delay in exercising any right constitutes a waiver. No waiver shall be effective unless in writing.

24. Entire Agreement, Survival and Language

These Terms, with the documents they incorporate and any agreement you have signed with Mast Finance for the Service (such as an Order Form or a beta evaluation agreement), are the whole agreement between you and Mast Finance about the Service. They replace any earlier understanding about it, written or oral, that those documents do not contain. Provisions that by their nature outlast the contract continue after it ends, in particular those on Customer Data after termination, confidentiality, liability, fees owed and governing law.

These Terms exist in French and in English, maintained together. In case of a difference between the two versions, the French version prevails. A rendering in any other language is provided for information only.

Mast Finance Sàrl — Rue Centrale 15, 1003 Lausanne, Switzerland — contact@mastfinance.io