Last updated: 16 October 2026
These Seller Terms apply when you sell digital products on Synthosy. They supplement our general Terms of Service and should be read alongside them. By listing a product, you agree to these terms.
To sell on Synthosy you must: be at least 18 years old; complete our seller onboarding process; connect a valid Stripe account for payouts; and comply with all applicable laws in your jurisdiction.
You may be an individual seller or represent a business. If representing a business, you confirm you have authority to bind that business to these terms.
By listing a product, you warrant that you: own or are licensed to sell the content; have the right to grant the licence to buyers; have accurately described the product; and have complied with our Acceptable Use Policy.
All listings are subject to review and approval before going live. We may decline or remove listings that do not meet our standards, with or without explanation, at our sole discretion.
The price you set is your price before VAT. Do not add VAT to it — where VAT applies, Synthosy adds it for the buyer at checkout (see section 7).
Synthosy charges a 6% platform fee on each completed sale, calculated on your listed price and rounded down to the nearest penny.
You may optionally promote a listing for an additional 4% promotion fee on sales made while the promotion is active. Founding sellers do not pay the promotion fee (section 10).
There is no listing fee. You only pay when you make a sale.
Card processing fees. Synthosy currently pays Stripe's card processing fees on every sale out of its own fee, so they are not deducted from your earnings. We may change this by giving you at least 30 days' notice by email; any change will only apply to sales made after the notice period ends.
What you receive. For each sale you receive your listed price minus the fees above. This is the same wherever the buyer lives — VAT paid by buyers is never deducted from your earnings. The live profit estimate shown when you create a listing uses exactly this calculation.
Payouts are processed via Stripe Connect. Your share of each sale is transferred to your connected Stripe account when the buyer pays. You must maintain an active, verified Stripe account to receive payments; sales cannot be made until Stripe onboarding is complete. Stripe's terms apply to the payout process.
Payout timing is subject to Stripe's standard payout schedule, typically 2–7 business days after a completed sale. Synthosy is not responsible for delays caused by Stripe or your bank.
If a sale is refunded, or a buyer wins a dispute or chargeback, your share of that sale is reversed from your Stripe account or deducted from future payouts.
You retain ownership of your content. By listing on Synthosy, you grant us a limited, non-exclusive licence to display and promote your listing on the Platform.
You are solely responsible for ensuring your content does not infringe third-party intellectual property rights. Synthosy will respond promptly to valid IP infringement notices.
7.1 Synthosy is the supplier for VAT. Under UK and EU rules for electronically supplied services sold through online marketplaces, Synthosy is treated as the supplier of your products to buyers for VAT purposes. Synthosy decides whether VAT applies, charges it on top of your price at checkout, keeps it separately from your earnings, and reports and pays it to HMRC and EU tax authorities. You must not charge buyers VAT yourself for sales made on Synthosy.
7.2 Self-billing agreement. For VAT and record-keeping purposes you are treated as supplying your products to Synthosy, and Synthosy as buying them for the amount you receive under section 4. You agree that:
7.3 VAT-registered sellers. If you are registered for VAT, add your VAT number in VAT Settings. You remain responsible for any VAT due on your supply to Synthosy in your own VAT return. Contact us before your first sale if you need VAT shown on your self-billed statements, and we will agree how it is calculated and paid.
7.4 Income tax and reporting. You are responsible for declaring and paying tax on your earnings. Synthosy may be required to collect information about you (such as your name, address, date of birth and tax reference) and report your sales to HMRC under the UK reporting rules for digital platforms, and we may share it for that purpose. You can provide and update these in Tax details.
Buyers may raise disputes within 14 days of purchase. You will be notified of any dispute and given the opportunity to respond. Synthosy's decision in disputes is final at the platform level.
We may issue refunds to buyers at our discretion where a product is materially misdescribed or defective. On a refund, your share of the sale is reversed and Synthosy returns its fee and the VAT; any card processing fee that Stripe keeps is borne by Synthosy.
We may suspend or terminate your seller account if you: violate these terms or our policies; receive an excessive number of disputes or chargebacks; engage in fraudulent activity; or fail to maintain a valid Stripe account.
Any pending payouts for legitimate completed sales will still be processed following termination, subject to any outstanding disputes.
The Founding Seller Programme is a limited promotional offer open to the first 50 sellers who complete Stripe Connect onboarding. Founding spots are claimed automatically in order of onboarding completion, and the programme closes once 50 spots have been claimed.
Eligible founding sellers receive: (a) a Founding Seller badge displayed on their storefront and listings; (b) free listing promotion, meaning the 4% promotion fee is waived for the lifetime of the account while it remains active and in good standing; and (c) the Pro Seller subscription at 50% of the standard price for 12 months from the date the founding spot is claimed, after which the standard Pro price applies automatically.
Founding perks do not reduce the 6% platform fee, which continues to apply to all sales; card processing fees are dealt with under section 4. The free promotion benefit is intended for ordinary use; Synthosy reserves the right to limit or withdraw it where it is abused or used in a manner inconsistent with normal selling activity.
Founding status and its perks are personal to the account, non-transferable, and offered at Synthosy's sole discretion. We may modify, suspend, or end the Founding Seller Programme at any time, and may revoke founding status and its perks where a seller violates these terms, engages in fraud, has their account suspended or terminated, or closes their account. References to benefits provided “for life” mean for the lifetime of the active account in good standing and do not survive account closure or termination.
The Pro subscription is billed monthly through Stripe. Prices are shown before VAT; VAT is added where it applies to you, and VAT-registered businesses can enter their VAT number at checkout. You can cancel at any time from your billing portal; access continues until the end of the paid period.
We may update these terms. For changes that reduce your earnings or materially affect your rights we will give you at least 30 days' notice by email. Continuing to sell after a change takes effect means you accept it.
For seller queries: hello@synthosy.com
Synthosy Marketplace Ltd, 60 Tranmere Road, London, SW18 3QJ. Company No. 17252333.