Terms of Service

Effective date: 10 November 2026These Terms of Service ("Terms") form a binding agreement between you and LetterAPI ("LetterAPI", "we", "us", "our"). They govern your access to and use of the letterapi.uk website, dashboard, API, SDKs, documentation, credits, shop partner tools and every related service (together, the "Platform"). Please read them carefully. By creating an account, generating an API key, placing an order, buying credits, applying as a print shop, or otherwise using the Platform, you agree to these Terms. If you do not agree, do not use the Platform.

1. Who we are and what the Platform is

1.1 LetterAPI is a technology platform and marketplace. It lets users submit letters and mail items through a dashboard or API, and routes each order to an independent third-party print shop or printing provider (a "Shop") that prints, envelopes and hands the item to a postal carrier such as Royal Mail.1.2 LetterAPI is not a printer, a postal operator, a courier, a law firm, a regulated financial or credit provider, or a legal, tax or compliance adviser. We provide software and a marketplace connection only. Printing, enveloping, postage and delivery are performed by third parties that we do not own, control or supervise.1.3 Each Shop is an independent business. No Shop is our employee, agent, partner or representative, and we do not act on behalf of any Shop or any user in any capacity beyond providing the Platform.1.4 Our registered business details are available on request through the Contact page. Notices to us must be sent through the Contact page on the website.

2. Eligibility and business use

2.1 You must be at least 18 years old and capable of entering a binding contract. If you use the Platform on behalf of a company or other organisation, you confirm you have authority to bind it, and "you" includes that organisation.2.2 The Platform is offered for business, professional and trade purposes only. By using it you confirm that you are not acting as a consumer within the meaning of the Consumer Rights Act 2015 and the Consumer Contracts (Information, Cancellation and Additional Charges) Regulations 2013, and that you are using the Platform wholly or mainly for the purposes of your trade, business, craft or profession.2.3 If you use the Platform for personal purposes anyway, you agree these Terms still apply to the fullest extent the law allows, and you accept that the Platform is custom, bespoke, print-on-demand fulfilment that begins immediately on your order.2.4 We may refuse registration, or restrict, suspend or close any account, at our sole discretion and without giving a reason.

3. Accounts, API keys and security

3.1 You must give accurate, current and complete information when you register and keep it up to date. Accounts are personal to you and may not be shared, sold or transferred.3.2 You are solely responsible for all activity under your account and for every API key issued to you, whether or not you authorised that activity. Keep keys and sign-in methods confidential and rotate any key you believe is compromised. We are not liable for any loss, charge, order or data exposure arising from lost, stolen, leaked or misused credentials.3.3 Orders placed with a valid API key or from a signed-in session are treated as authorised by you and are binding.3.4 You must notify us promptly through the Contact page if you suspect unauthorised access. Notifying us does not make us responsible for earlier or later activity.3.5 Sandbox or test mode is provided for development only. Test orders are not printed or posted, and test data, keys and results carry no guarantee of any kind.

4. Orders and your content

4.1 You are solely responsible for everything you submit, including letter content, attachments, templates, recipient names and addresses, sender details, selected options and the selected Shop ("Your Content"). We do not review, verify, proofread or correct Your Content and are not obliged to.4.2 Orders are printed and sent exactly as submitted. Layout, margins, fonts, colours, paper, page breaks, PDF conversion and print output can differ from on-screen previews. Previews are indicative only, and we make no promise that the printed item will match them.4.3 You are responsible for the accuracy and deliverability of every address. Items sent to a wrong, incomplete, outdated or non-existent address, returned, lost or opened by someone other than the recipient are your risk and are not refundable or reprintable by right.4.4 You confirm that you have all rights, licences, consents and lawful grounds required to send Your Content to each recipient, including under data protection, privacy, direct marketing and communications laws.4.5 An order is accepted only when we or the Shop begin processing it. We may decline, hold, delay, cancel, reroute to another Shop, or refuse any order at any time and for any reason, before or after payment or acceptance, at our sole discretion.4.6 Once an order has been submitted to a Shop it may not be possible to amend or cancel it. Physical items cannot be recalled. Any cancellation is at our and the Shop's sole discretion.4.7 You grant us and the relevant Shop a non-exclusive, worldwide, royalty-free licence to host, copy, process, transform, print and transmit Your Content as needed to operate the Platform, fulfil your orders, prevent abuse, comply with law and enforce these Terms.

5.1 Before you place a bulk order, you must confirm on the order page that the people you are writing to have agreed to receive your mail. You confirm this each time you place an order. We record that you gave this confirmation, and when, with the order.5.2 That confirmation means you asked each recipient for their postal address, told them what you would send and who it would come from, and they agreed to receive it (an opt-in). It is your responsibility to hold evidence of each recipient's agreement and to give it to us on request.5.3 You must only send marketing or promotional mail to a person who has agreed to receive it, or where you otherwise have a lawful basis to send it under data protection and direct marketing law. You must honour any request to stop, remove someone from your list immediately, and not include them in later orders.5.4 You must not upload address lists that you bought, rented, scraped or took from another purpose, and you must not send mail to a person who has told you or any other sender that they do not want it.5.5 If we think an order breaches this section, we may hold, cancel or refuse it, suspend your account, and pass on information to a regulator or to a recipient who complains. You are responsible for any complaint, claim, fine or cost that results from mail you send without recipient consent, and you will compensate us for it under the indemnity in these Terms.

6. Legal notices, regulated mail and no guarantee of effect

6.1 The Platform may be used to send letters that you intend to have legal, contractual or regulatory effect, such as statutory notices, rent or tenancy notices, debt, finance or credit communications, or formal notifications. We provide no legal advice, templates are not legal advice, and we do not check that any letter is valid, complete, correctly worded, or properly served.6.2 We give no assurance that any item will be delivered, delivered by a particular date or time, or accepted as valid service, proof of posting, proof of delivery, or notice under any law, contract, court rule or regulation. Whether a letter has the effect you intend, and whether you have met any deadline or service requirement, is entirely your responsibility.6.3 If timing or proof matters, you must independently choose and arrange suitable tracked or recorded delivery, certificates of posting or other evidence, and take your own advice.6.4 You must not rely on the Platform as your only means of meeting any legal, regulatory, financial, tenancy, employment or contractual deadline.

7. Pricing, credits and payments

7.1 Prices shown on the Platform, including estimates, pricing calculators and Shop-specific prices, may change at any time. Shops set their own printing and envelope costs, so final price depends on the Shop and options you pick. The price confirmed at checkout, or deducted from your balance when the order is created, is the price for that order.7.2 Prices are shown in pounds sterling. Unless stated otherwise, prices may exclude applicable taxes, and you are responsible for any taxes, duties and bank or payment charges that apply to you.7.3 Payments are processed by a third-party payment provider (currently Stripe). We do not store full card details. You authorise us and our payment provider to charge your chosen payment method for all amounts due. You agree to the payment provider's own terms.7.4 Credits are a prepaid balance used only to pay for orders on the Platform. Credits are not money, a deposit, a bank balance or e-money, hold no cash value, earn no interest, cannot be withdrawn, transferred, sold or exchanged, and belong to the account that bought them. We may set, change or remove limits, minimums, bonuses and expiry rules for credits at our discretion on notice posted to the Platform.7.5 Fees, credit purchases, and amounts paid for orders are non-refundable. This applies if you change your mind, order by mistake, supply wrong content or addresses, are unhappy with print quality or delivery speed, stop using the Platform, or your account is suspended or closed.7.6 Any refund, reprint, credit return, goodwill credit or other remedy is entirely at our sole and absolute discretion, may be refused without explanation, and in any case does not create a right to a similar remedy in future. Where we decide to give one, we may choose its form, which will usually be a credit to your balance rather than a payment to your card, and we may set conditions on it.7.7 If a payment is reversed, disputed, charged back or fails, we may immediately suspend your account, cancel orders, deduct the amount owed from any balance, and recover the amount together with our reasonable costs of recovery. Opening a chargeback instead of contacting us first is a breach of these Terms.7.8 We may correct pricing or billing errors at any time, including after an order is accepted, by adjusting your balance or charging the correct amount.

8. Printing, delivery and third-party carriers

8.1 Any dispatch time, delivery time, service class or tracking information shown is an estimate or a courtesy only, and is not a promise or guarantee. Delivery depends on Shops, postal carriers, weather, strikes, address quality, regulation and other matters outside our control.8.2 We are not responsible for the acts, omissions, errors, delays, quality, defects, mis-sorting, loss, damage, theft, non-delivery, or compliance of any Shop, postal carrier, courier or other third party, even where we helped choose, recommend, pay or contact them.8.3 Shop quality, paper, ink, print finish, envelope type and fulfilment performance can vary. We make no representation about the quality, legality, suitability or availability of any Shop or its services.8.4 Order statuses, tracking events and messages shown on the Platform come from Shops or carriers and may be late, incomplete or wrong. You should not rely on them as proof of anything.8.5 Risk in each item passes to you when it is handed to the Shop or carrier, or, if earlier, when your order is submitted.8.6 Any claim for loss, damage or non-delivery that a carrier or Shop offers under its own terms must be pursued by you directly. We have no duty to pursue it for you.

9. Acceptable use

9.1 You must not use the Platform to send, or help send, anything that is unlawful, harmful, fraudulent, deceptive, threatening, harassing, abusive, obscene, discriminatory, defamatory, or that infringes anyone's rights, including: scam, phishing or fake debt-collection mail; impersonation of people, government bodies, banks or businesses; unsolicited marketing that breaches the law; items containing or promoting violence, hatred, terrorism or exploitation; illegal goods or substances; malware lures; and mail intended to harass or intimidate.9.2 You must not send items prohibited by Royal Mail or any other carrier used for fulfilment, including dangerous, restricted or prohibited goods or content.9.3 You must not misuse the Platform, including by: scraping or reverse engineering it; probing or testing its security without written permission; interfering with its operation; bypassing rate limits, pricing, credit or access controls; reselling or white-labelling access without our written consent; creating multiple accounts to evade limits or enforcement; or using it to build a competing service.9.4 You must not use the Platform in a way that exposes us, a Shop, a carrier or any recipient to legal, regulatory, financial or reputational risk.9.5 We may, but are not obliged to, monitor, review, remove, block or report any content, order or activity. We may disclose information to carriers, Shops, regulators, law enforcement and affected parties where we think it appropriate. Our choice not to act in one case is not a waiver.

10. Terms for print shops and partners

10.1 If you apply to or operate on the Platform as a Shop, these Terms apply to you in addition to any commercial terms agreed in writing. Approval of an application is entirely at our discretion and may be withheld or withdrawn at any time without reason.10.2 A Shop is an independent contractor. A Shop is solely responsible for its own staff, premises, equipment, insurance, tax, licences, regulatory compliance, data protection compliance, quality, fulfilment, postage, and every order it accepts or processes, and for any liability that results.10.3 A Shop must process orders accurately and promptly, keep order statuses truthful, use recipient and letter data only to fulfil the order, keep it secure, and securely destroy or return it once fulfilment is complete, unless the law requires otherwise.10.4 A Shop agrees to indemnify us in line with the indemnity clause of these Terms for claims arising from its fulfilment, its handling of data, and its breach of these Terms.10.5 We may change Shop pricing visibility, margins, fees, payout timing, routing, ranking and eligibility at any time. We may suspend, withhold or set off any amounts owed to a Shop against losses, chargebacks, refunds, customer claims or breaches, and may withhold payouts while we investigate.

11. Our discretion to operate and change the Platform

11.1 We have complete and sole discretion over the Platform. At any time, with or without notice, we may add, change, restrict, suspend or discontinue any feature, price, Shop, provider, delivery option, limit, integration, API version, SDK or the whole Platform, and may change how we calculate, apply or describe fees.11.2 We may suspend or terminate your account, API keys, access or any order immediately, without notice or liability, if we believe you have breached these Terms, if we suspect fraud, abuse, non-payment or legal risk, if required by law or a carrier, or simply if we choose to stop dealing with you.11.3 If we suspend or terminate your account for breach, any unused credits are forfeited. If we terminate for convenience, we may, at our sole discretion, return remaining credits in the form and manner we choose, and nothing in these Terms obliges us to.11.4 Our decisions on eligibility, disputes, refunds, reprints, credits, suspension, account closure and interpretation of these Terms are final.11.5 You may stop using the Platform at any time. Closing your account does not entitle you to a refund and does not release you from amounts owed or obligations that are meant to continue.

12. Intellectual property

12.1 The Platform, including its software, API, SDKs, documentation, designs, text, trademarks and logos, is owned by or licensed to us and protected by intellectual property laws. We grant you a limited, revocable, non-exclusive, non-transferable, non-sublicensable licence to use the Platform for your internal business purposes in line with these Terms.12.2 You keep ownership of Your Content. You confirm that Your Content, and our and the Shop's use of it as set out in these Terms, does not and will not infringe or violate anyone's rights or any law.12.3 If you give us feedback or suggestions, you grant us a perpetual, worldwide, irrevocable, royalty-free licence to use them without restriction or payment.

13. Disclaimer of warranties

13.1 To the fullest extent permitted by law, the Platform and everything provided through it are supplied "as is" and "as available", with all faults, and without warranties or conditions of any kind, whether express, implied, statutory or otherwise, including any implied terms about satisfactory quality, fitness for a particular purpose, accuracy, non-infringement, uninterrupted or error-free operation, security, or that results or outcomes will be achieved.13.2 We do not warrant that the Platform, the API, webhooks, previews, statuses, tracking, estimates or notifications will be available, timely, accurate, complete or free of errors, bugs, outages, data loss or security incidents. Webhooks and emails may be delayed, duplicated, lost or fail.13.3 Information on the Platform, including in the blog, documentation and use-case pages, is general information only. It is not legal, financial, tax or professional advice, and you rely on it at your own risk.

14. Limitation of liability

14.1 Nothing in these Terms excludes or limits any liability that cannot lawfully be excluded or limited, including liability for death or personal injury caused by negligence, for fraud or fraudulent misrepresentation, or any other liability that the law does not allow to be excluded. Everything else in this section applies subject to that.14.2 To the fullest extent permitted by law, we, our owners, directors, officers, employees, contractors, affiliates, licensors and suppliers (together the "LetterAPI Parties") will have no liability to you or anyone else, whether in contract, tort (including negligence), breach of statutory duty, misrepresentation, restitution or otherwise, for any loss or damage arising out of or connected with the Platform, any order, any Shop, any carrier, or these Terms.14.3 Without limiting the previous clause, and to the fullest extent permitted by law, the LetterAPI Parties are not liable for: (a) any lost, late, misdelivered, damaged, undelivered, misprinted or unreadable item; (b) acts, omissions or defaults of any Shop, carrier, payment provider, hosting provider, email provider or other third party; (c) missed deadlines, failed service of notices, lost rights, penalties, fines, interest, court or tribunal outcomes, or any consequence of a letter not arriving or being valid; (d) loss of profit, revenue, business, contracts, goodwill, anticipated savings, or opportunity; (e) loss or corruption of data or content; (f) indirect, consequential, special, incidental, exemplary or punitive loss; (g) outages, delays, bugs, security incidents or unauthorised access; or (h) any matter outside our reasonable control.14.4 These exclusions apply even if the loss was foreseeable, even if we were told it might happen, and even if a remedy fails of its essential purpose.14.5 If, despite the above, any court or tribunal decides that a LetterAPI Party is liable to you, the total aggregate liability of all LetterAPI Parties for all claims arising from the Platform will not exceed the lower of (i) the amount you actually paid us for the specific order giving rise to the claim, and (ii) one hundred pounds sterling (£100).14.6 You agree that these limits are a fair and reasonable allocation of risk, reflecting the low prices charged, that you have had the opportunity to take your own advice and to insure against the risks, and that we would not offer the Platform without them.14.7 Any claim against any LetterAPI Party must be brought within one (1) year of the event giving rise to it. After that, it is permanently barred to the extent the law allows.

15. Indemnity

15.1 You will defend, indemnify and hold harmless the LetterAPI Parties against all claims, demands, proceedings, losses, liabilities, damages, fines, penalties, costs and expenses (including reasonable legal fees on a full indemnity basis) arising from or connected with: Your Content; your use or misuse of the Platform; your breach of these Terms or any law; your breach of any third party's rights, including data protection and privacy rights; any recipient or third party complaint about mail you sent; and any activity under your account or API keys.15.2 We may take over the defence of any claim at your expense. You must not settle any claim that affects a LetterAPI Party without our written consent.

16. Third-party services and links

16.1 The Platform relies on and links to third-party services, including payment processors, hosting and database providers, email delivery providers, document conversion services, scheduling tools, postal carriers and Shops. Their terms and privacy practices apply to your use of them, and we are not responsible for them or their availability.16.2 Integrations, SDKs, code samples and third-party tools are provided without warranty and used at your own risk.

17. Privacy and data protection

17.1 Our Privacy Policy explains how we handle personal data and forms part of these Terms.17.2 Where you send us personal data about recipients or other individuals in Your Content or addresses, you are the controller of that data and we act as your processor (and Shops act as our sub-processors) to the extent that data protection law treats us that way. You must have a lawful basis for sending it, give any notices required, and make sure that your instructions comply with the law.17.3 You are responsible for responding to requests from the individuals whose data you submit. We may help at our discretion and may charge for it.

18. Events beyond our control

18.1 We are not liable for any failure or delay caused by events outside our reasonable control, including postal or industrial action, carrier or Shop failure, power, internet or cloud outages, cyber-attacks, supplier failure, pandemics, severe weather, war, terrorism, civil unrest, government action, changes in law, and failures of third-party services.

19. Changes to these Terms

19.1 We may change these Terms at any time by posting the updated version on this page and updating the effective date. Changes apply from the time they are posted, or a later date if stated. Your continued use of the Platform after that is your acceptance of the change. If you do not accept a change, you must stop using the Platform.19.2 It is your responsibility to check this page regularly.

20. Governing law and disputes

20.1 These Terms and any dispute or claim arising out of or in connection with them or the Platform (including non-contractual disputes and claims) are governed by the laws of England and Wales.20.2 The courts of England and Wales have exclusive jurisdiction over any such dispute. We may bring proceedings against you in any court of competent jurisdiction, including where you are based.20.3 You agree to raise any dispute with us in good faith through the Contact page first and to give us at least thirty (30) days to respond before starting proceedings.20.4 To the fullest extent permitted by law, you agree to bring claims only on your own behalf and not as part of any class, collective, group or representative action.

21. General

21.1 These Terms, together with the Privacy Policy and any commercial terms we agree in writing, are the entire agreement between you and us about the Platform and replace all earlier statements, discussions and agreements. You confirm you have not relied on any statement or promise that is not set out in them.21.2 If any part of these Terms is found to be invalid or unenforceable, the rest stays in force and the part will be replaced by a valid provision that comes closest to the original intent.21.3 Our failure to enforce a right is not a waiver of it. A waiver is effective only if in writing and signed by us.21.4 You may not assign or transfer any of your rights or obligations without our prior written consent. We may assign, transfer or subcontract ours freely, including on a merger, sale or reorganisation.21.5 Nobody other than you and us has any right to enforce these Terms under the Contracts (Rights of Third Parties) Act 1999, except that the LetterAPI Parties may rely on and enforce the provisions that protect them.21.6 Nothing in these Terms creates a partnership, joint venture, agency, fiduciary or employment relationship between you and us.21.7 Clauses that by their nature should survive termination (including those on payment, content, disclaimers, limitation of liability, indemnity, governing law and general provisions) will survive.21.8 We may give you notices by email to the address on your account, through the dashboard, or by posting on the website. You must send us notices through the Contact page.

22. Contact

22.1 Questions about these Terms can be sent through the Contact page on the website. We may not respond to every message, and a lack of response is not acceptance of any claim.

LetterAPIPrint and post letters in the UK, from one letter to thousands.