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Not sure if you actually need a custom API?
We'll give you a straight answer before we build anything.

An API is how your systems talk to each other without someone copying data by hand. We tell you honestly whether you need one, a simpler integration, or an off-the-shelf tool, then design and build it if you do.

Honest scoping, not a sales call If your problem doesn't need a custom API, we'll tell you what does.

Self-check

Signs you actually need a custom API

Most businesses don't. If none of these sound familiar, a custom API is probably the wrong tool, and we'll say so.

You're paying for the same data twice

Your CRM, your billing tool, and your app each hold a version of the same customer record, and someone is manually keeping them in sync.

A spreadsheet is now a bottleneck

A process that used to be occasional copy-paste is now a daily task, and it doesn't scale with headcount you don't want to add.

You want to let others build on what you've built

A partner, a customer, or your own mobile app needs to talk to your system programmatically, not through a screen.

Every new tool needs a custom Zapier workaround

You've hit the complexity ceiling of no-code connectors, and they're starting to break silently.

Once you know which one you need

What each path actually costs you

Every competitor page skips straight to "build you an API." We start one step earlier: here's the real cost and tradeoff of each option, not just the one we sell.

Off-the-shelf / no-code

$20-$300/month · Days

Fast and cheap, but you're limited to what the connector supports, and it can break silently when either tool changes.

Custom integration

Low thousands, fixed price · 1-2 weeks

Solves the specific connection you need, but doesn't give you a reusable interface for anything beyond it.

Custom API

Scoped by endpoint count · 2-4 weeks

Higher upfront cost, but it's yours: reusable, extensible, and not dependent on a third-party connector staying supported.

What happens next

People fear ambiguity more than cost. Here is exactly what working with us looks like.

1

Scoping Call

Free

30-minute call

Tell us the problem, and we'll help you figure out the solution. We'll tell you honestly whether it calls for a custom API, a simpler integration, or something off-the-shelf, and roughly what it would cost.

2

Design & Fixed Quote

Scoped by endpoint count

2-5 Days

We map the endpoints, data, and systems involved, and give you a fixed price and timeline in writing before any build work starts. No hourly surprises.

3

Build & Hand Over

Fixed price, per the quote

We build, test, and document it, then hand over full ownership: code, documentation, and access, in your own repository. Nothing locks you to us afterward.

Frequently asked questions

What if I don't know what I need yet?

That's normal, and it's exactly what the first call is for. Tell us the problem, and we'll help you figure out the solution. We'll tell you honestly whether it calls for a custom API, a simpler integration, or an off-the-shelf tool, before you spend anything.

What does an API actually mean for my business?

In plain terms: it's how your systems talk to each other without a human copying data between them. If your app needs to talk to Stripe, your CRM, and your own mobile app, an API is what lets those three things stay in sync automatically.

What do I need to bring to a first call?

Nothing formal. A description of the manual work or the disconnected systems is enough. If you have login access to the tools involved, that helps, but it's not required for the first conversation.

What happens after launch, who owns it?

You do. Full code ownership transfers to you, documented, in your own repository. If you ever want to move to another developer or bring it in-house, there's nothing locking you to us.

What if my dev shop disappears?

This is the outsourcing fear we hear most, and it's a fair one. Because you own the code and the documentation from day one, a shop disappearing is an inconvenience, not a catastrophe. It's also why we scope in writing before work begins.

How is pricing structured?

A short scoping conversation (free) tells us the shape of the work. Straightforward integrations start in the low thousands; a full custom API is scoped by number of endpoints and integration complexity and quoted as a fixed price before any build work starts.

100%

code ownership transfers to you at handover. Documented, in your own repository, no vendor lock-in.

$110/hr

All work is billed at a single rate, scoped upfront into a fixed price. No surprises, no scope creep billed silently.

0

cost to find out if you actually need a custom API. The scoping call is free, and a "no" is a valid outcome.

A small, senior team, not a service catalog.

Most API development shops lead with scale: hundreds of engineers, dozens of industries, every protocol. We lead with the opposite: a small senior team that tells you the truth about what you need, then builds it well.

No risk to getting started

  • The scoping call is free, and "you don't need this" is a real possible outcome

  • Fixed pricing and a written scope before any build work begins

  • You own the code, documentation, and access from handover onward

  • We can work alongside your existing developer or team if needed

How we work

  • Honesty. If you don't need a custom API, we tell you that on the call. We'd rather lose the project than sell you something you don't need.

  • Clear process. You know what we are doing, why, and what it costs before we start.

  • No overruns. Everything is scoped upfront. $110/hr, derived to a fixed price.

  • We stay. We are not a project vendor. We are a partner who is still here in 12 months.

Follow Assembler AI

Let's start with an honest conversation.

No pitch deck. No sales call. Tell us where you are and what you are dealing with, we will tell you what we would do. If we are not the right fit, we will say that too.

  • We respond within one business day
  • No commitment required to have the first conversation
  • Every engagement starts with us understanding your business