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API Documentation

A reference developers trust.

Every endpoint documented, every sample run against your live API before it ships. If the code on the page doesn't work, it doesn't go out.

100%Samples tested live
10minTo first call
4+Languages per endpoint
docs.yourproduct.com / api / payments / create-charge
Payments
Overview
Create a charge
Refund a charge
Webhooks
Event types
Verifying signatures
Reference
Errors
Create a charge
POST /v1/charges ✓ sample verified
# charge a stored card, 20.00 USD
curl -X POST https://api.yourproduct.com/v1/charges \
  -H "Authorization: Bearer $API_KEY" \
  -d amount=2000 \
  -d currency=usd
1
2
Ran clean against the live API
The problem

A developer decides in ten minutes.

They won't book a demo. They won't email sales. They'll open your reference, try to make one call work, and either keep going or close the tab. Your API docs are the sales call, and nobody is there to help.

Samples that don't run

A snippet that errors costs a developer an hour before they realise it wasn't their fault. That hour is where trust goes.

Errors nobody documented

Happy paths are easy. What breaks a real integration is the 409 you never explained and the retry rule nobody wrote down.

Agents paste your mistakes

Cursor and Copilot answer from your docs now. A stale parameter doesn't stay on the page — it lands in your user's editor.

Your reference is the only salesperson that works at 2am, and it never gets a second chance.

Workflow

Our process, step by step.

We learn your API

One session with an engineer who knows it. We go through what it does, who integrates with it, and which parts people get wrong.

  • What a first integration looks like
  • Where support tickets cluster
  • What's deprecated but still live
Session notes
Auth modelRate limits
PaginationCommon errors

We clean the spec, then map it

Your OpenAPI spec is the backbone, so we fix it first — missing descriptions, wrong types, undocumented fields. Then you approve the page structure.

  • OpenAPI audit and cleanup
  • Endpoint grouping that matches real tasks
  • Guides vs reference, split properly
Spec audit
42 endpoints
11 undocumented
6 deprecated

We write it and run every sample

Each endpoint gets a real description, a typed parameter table, and working samples in the languages you support. Then we execute them against your live API.

  • Samples in 4+ languages per endpoint
  • Executed against a real test account
  • Full error catalogue with fixes
Sample runs
✓ 200
✓ 201
✓ 200
re-run

We make it fast to scan

Language tabs, copy buttons, a sticky endpoint reference, and search that lands on the right method. Built to be skimmed, not read.

  • Per-language code tabs
  • Try-it panels where they help
  • Your branding, not a default theme
Reference UI
cURLNodePython

We ship it and keep it honest

Live on your domain with llms.txt included. Then the samples run in CI, so the day one of them stops working, someone finds out.

  • Deployed, not handed over as files
  • Samples runnable in CI
  • Optional retainer as the API evolves
Delivery
Livellms.txtCI checks
docs.yourproduct.com
What's included

Everything between signup and first call.

A reference is more than a list of endpoints. It's auth, errors, pagination, and the unglamorous middle of a real integration — the parts that decide whether someone finishes.

Endpoint reference

Every method with a real description, typed parameters, and complete request and response pairs. Generated from your spec, then written by a person.

Tested code samples

Four or more languages per endpoint, each one executed against your live API before publish. If it doesn't run, it doesn't ship.

Auth, errors & limits

The three things every integration hits and most docs skip. A full error catalogue with what causes each one and what to do about it.

How do I paginate results?
✓ from docs.yourproduct.com/api

Built for agents too

Structured so Cursor, Copilot and ChatGPT quote your API correctly. llms.txt shipped by default, because they read your docs before your users do.

Works with your spec and stack OpenAPISwaggerPostmanRedoclyStoplightMintlifyReadMeDocusaurus
Automation

Ship an endpoint. The docs already know.

API docs rot faster than anything else you publish, because the product changes underneath them every sprint. So we automate the watching. Our agents track your spec and your releases, flag the pages a change breaks, and draft the fix — then a writer checks it before it goes live.

01 Spec diffs, caught same dayA new field, a changed type, a removed endpoint. If it touches a documented method, we know.
02 Samples run in CIEvery published snippet is executable. The day one breaks, the build tells you instead of a customer.
03 A human still signs offNothing publishes on its own. Automation removes the chore, not the judgement.
Docs pipelineWatching
1You ship a spec changecharges: + idempotency_key
2The agent diffs it1 new field, 2 pages affected
3Samples re-run4 languages, all green
4Drafts are writtenparam table + example updated
5A writer approvesreviewed, then published
Your reference stops drifting, and nobody on your team had to remember.
The result

What changes when it goes live.

Before

A developer pastes your sample, gets an error, and assumes your API is broken.

After

It runs first time, because we ran it first.

Before

Your engineers answer integration questions in a shared Slack channel.

After

The reference answers them. Once, correctly, for everyone.

Before

An evaluation stalls because nobody could get past authentication.

After

They make their first successful call in ten minutes.

Before

Copilot suggests a parameter you removed two releases ago.

After

It suggests the current one, because your docs say so.

Questions

What teams ask first.

Writers write it. We use in-house agents to speed up the slow parts — reading your codebase, pulling structure out of an API spec, producing a first draft, spotting pages that have drifted out of date. That saves days. But a person decides what goes on the page, checks it against your product, and signs it off. A model can't tell when your product's own behaviour doesn't make sense, and noticing that is half of what you're paying us for.

A test or sandbox account is enough. We need to actually execute the samples — that's the difference between a reference that works and one that looks like it should. We never need production credentials.

You can, and you should — for the skeleton. But a generator only knows what your spec says, and specs are usually incomplete: missing descriptions, vague types, no guidance on when to use what. It also can't write the getting-started guide, which is the page that actually decides whether someone integrates. We fix the spec first, then write the parts a generator can't.

Whichever your users actually ship in. cURL plus three or four others is typical — Node, Python, Go, Java, Ruby, PHP. We'd rather do four languages properly than eight badly.

Two ways. The samples are runnable in CI, so a break shows up in your build rather than in a support ticket. And our agents diff your spec on every release, flag the pages a change affects, and draft the update for a writer to review.

Yours. If you don't have one, we'll recommend one and set it up. We work with the usual docs platforms and with docs-as-code in your own repo. There's nothing you have to rent from us, and nothing you can't take with you.

Start your project.

Send us your spec and a sandbox key. We'll tell you what's missing and what it's costing you in failed integrations.