Service Level Agreements for Startups: What Are You Actually Promising?

Your sales deck says 99.9% uptime. Your first real enterprise prospect just asked you to put that number in the contract, with money attached if you miss.

Those are two different promises. The first is marketing. The second is a commitment you can be held to. For most startups the gap between them is not a drafting problem, it is an infrastructure problem that nobody priced before signing. Here is what a service level agreement for startups actually commits you to, and what to check before you agree to one.

What Does a Service Level Agreement Actually Commit You To?

A Service Level Agreement (SLA) is the part of your customer contract that promises measurable performance and says what happens if you fall short. It usually sits in an exhibit rather than the main agreement, which is why it often gets signed without a close read.

Four parts do the work:

• The service level, usually an uptime percentage.
• The measurement window, which matters more than founders expect. At 99.9%, monthly measurement allows about 43 minutes of downtime per month. The same figure measured annually allows a single outage of nearly nine hours.
• The service credit, normally a percentage of fees refunded or applied forward.
• The exclusions, covering downtime that does not count against you.

What Is the One Clause Most Startups Miss?

An SLA stating that service credits are the customer’s sole and exclusive remedy attempts to cap downtime exposure at the credit amount. Without it, a customer may argue they can take the credits and separately pursue damages for breach.

Whether that argument succeeds can depend on how the SLA interacts with the Limitation of Liability clause elsewhere in the agreement, and on applicable law. The two provisions need to be read together, not separately.

What Should You Check Before Agreeing to a Number?

An SLA is not a description of how your system performs today. It is a forward-looking promise, enforceable whether or not your infrastructure can keep it.

The practical test is whether you can measure what you promised. If you have no monitoring producing a defensible uptime figure, you can neither prove you met the standard nor efficiently rebut a customer who says you did not.

Watch the termination trigger too. A right to terminate after three missed months in a rolling year turns an infrastructure decision into a question about whether you keep your largest customer.

Common Mistakes Founders Make

• Promising a number you cannot measure. Commit only to a standard you can instrument and evidence.
• Leaving out the exclusive-remedy language. Credits are meant to be a ceiling on downtime exposure. Without that language you may have created a payment obligation without capping the underlying claim.
• Copying an SLA from a company that is not you. Major cloud providers write for global redundancy and dedicated reliability teams. Adopting their numbers without their architecture means adopting promises you may not be able to keep.

Before You Sign, Check These Six Things

• What uptime number appears in our sales materials or proposals right now?
• Could we produce a defensible uptime figure for last month?
• Is the measurement window monthly, quarterly, or annual, and what does each allow in actual minutes?
• Do the exclusions cover scheduled maintenance and third-party infrastructure we do not control?
• Are service credits stated as the sole and exclusive remedy?
• Does any customer hold a termination right tied to repeated misses, and how close are we?

The Bottom Line

An SLA is one of the few contract terms where the legal question and the engineering question are the same question. Before a number goes in writing, the SLA, the limitation of liability clause, and your actual infrastructure need to be reviewed together. They either line up or they do not.

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