The engine behind everything Kynth ships. Now it’s yours.

Invoices, statements, contracts, resumes — parsed to schema-valid JSON at a flat price per document.

And 30 more finished-job endpoints on one key and wallet, with 500 free credits every month.

Get your key

Try it live

api.kynth.studio
# A PDF in. Bookable data out. $0.08.
curl https://api.kynth.studio/v1/invoice \
  -H "Authorization: Bearer ksk_..." \
  -d '{ "fileUrl": "https://…/invoice.pdf" }'

{ "vendor": "Acme Supplies Inc.",
  "invoiceNumber": "INV-10428",
  "total": 1255.50, "lineItems": [ … ] }

//

Endpoints

Documents are the spearhead. Everything else rides the same wallet.

Document engines
POST/v1/invoiceInvoice parsing$0.08
POST/v1/statementBank statements$0.12
POST/v1/contractContract analysis$0.15
+ 6 more document kinds → /endpoints

Nine document engines

Each committed to one document kind — invoice, statement, contract, resume — so the JSON comes back schema-valid, field-accurate, and flat-priced.

Browse endpoints

A console that shows the work

Requests, Jobs, and Webhooks — every call logged, every job traceable, every webhook replayable.

See it in action

RequestsJobsWebhooks
09:41:22/v1/invoice612mssucceeded
09:41:19/v1/classify204mssucceeded
09:40:57/v1/statement—running
Playground
invoice.pdf
Run → $0.08
{
  "vendor": "Acme…",
  "total": 1255.50,
  "dueDate": "2026-08-01"
}

A playground before a single line of code

Paste a document, pick an endpoint, watch the JSON come back — before you write a single line.

Open the playground

//

Use cases

One call per job. Pick yours.

Every endpoint is a finished job with its own page and its own price — never a prompt you have to engineer.

Parse documents

Classify & extract

Automate with jobs & webhooks

# A PDF in. Bookable data out. $0.08.
curl https://api.kynth.studio/v1/invoice \
  -H "Authorization: Bearer ksk_..." \
  -d '{ "fileUrl": "https://…/invoice.pdf" }'

{ "vendor": "Acme Supplies Inc.",
  "invoiceNumber": "INV-10428",
  "total": 1255.50, "lineItems": […] }

Parse documents

POST a file URL, get bookable JSON back — vendor, totals, line items. Every document type is its own endpoint with its own page and its own price.

Run it in the playground →

//

Benefits

One key. 39 finished jobs.

Charged only on success

A failed task costs nothing. Ever.

Flat price per task

$0.08 an invoice. No token math, no surprise bills.

One wallet, every endpoint

Credits spend on any of the 39 jobs. They never expire.

No prompt engineering

Each endpoint is committed to one job. Send the file, get the fields.

Scored in the open

Public benchmarks for every document engine — accuracy you can audit.

Async when you need it

Jobs and webhooks for long-running work, straight from the console.

//

Testimonials

Everything Kynth ships runs on this engine. In production. Today.

Answers every call, books the appointment, logs the transcript.

Kynth Receptionist

/v1/transcribe + /v1/classify

Rebooks the no-show before the slot goes cold. — Kynth No-Shows · /v1/classify + /v1/draft

Wins back lapsed customers with a note that sounds like you. — Kynth Winback · /v1/draft

Reads the messy CRM and hands back clean records. — Kynth CRM Cleanup · /v1/extract

Drafts the representment from the reason code and the receipts.

Kynth Chargebacks

/v1/chargeback

Answers every call, books the appointment, logs the transcript. — Kynth Receptionist · /v1/transcribe + /v1/classify

Chases every overdue invoice until the money lands.

Kynth Invoices

/v1/invoice

Wins back lapsed customers with a note that sounds like you. — Kynth Winback · /v1/draft

Rebooks the no-show before the slot goes cold. — Kynth No-Shows · /v1/classify + /v1/draft

//

Pricing

Start free. Pay per task.

Every price is per finished task, charged only on success. One wallet spends on any endpoint, and credits never expire.

Free

$0

/month

500 credits every month, no card. Your wallet refills to the floor on the 1st — enough to ship a real integration before you pay a cent.

Get your key

Features

500 credits every month

All 39 endpoints

Playground + console

Jobs & webhooks

Developer

Popular

$29

$29

/month

3,500 credits every month — about 20% more per dollar than the Starter pack.

Subscribe

Features

3,500 credits monthly

Every document engine

Requests, Jobs & Webhooks console

Auto-recharge

Team

$99

/month

13,000 credits every month — more per dollar than every pack.

Subscribe

Features

13,000 credits monthly

All 39 endpoints

Priority processing

Auto-recharge

//

Three ways to call it

curl it, type it, or hand it to your agent.

$ curl …/v1/invoice
→ 200 · schema-valid JSON

curl

One HTTPS call. Bearer key. Schema-valid JSON back.

curl https://api.kynth.studio/v1/invoice

Copy

$ npm i @kynth/api
$ pip install kynth

SDKs

Typed clients for both stacks — npm i @kynth/api, pip install kynth.

Read the docs

{ "kynth-core": {
  "command": "npx",
  "args": ["@kynth/api-mcp"]
} }

MCP

Every Core capability as a native tool in Claude and Cursor — npx @kynth/api-mcp.

See MCP setup

//

FAQ

Questions? We've got answers.

What is a credit?

Is there really a free tier?

Is this a wrapper around someone else's API?

How accurate is document parsing?

What about long-running work?

Do credits expire?

Ship your first parse in minutes.

500 free credits every month.

No card. Charged only on success.

Get your key

API key
ksk_live_••••••••••••3kq7
Wallet500 credits · refills monthly
Last task/v1/invoice · $0.08 · ✓