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One authenticated REST API for Korean tax, banking, payroll and AI classification. Issue NTS tax invoices, sync 6 banks and 8 card issuers, and auto-classify transactions — straight from your own system.
# Issue an electronic tax invoice → NTS curl -X POST https://api.cosap.io/v1/tax-invoices \ -H "Authorization: Bearer sk_live_x9f2…" \ -H "Content-Type: application/json" \ -d '{ "buyer_biz_no": "120-86-00000", "supply_amount": 1500000, "items": [{ "name": "License" }] }'
# Issue an electronic tax invoice → NTS import cosap client = cosap.Client("sk_live_x9f2…") invoice = client.tax_invoices.create( buyer_biz_no="120-86-00000", supply_amount=1500000, items=[{"name": "License"}], ) print(invoice.status) # "transmitted"
// Issue an electronic tax invoice → NTS import Cosap from "cosap"; const client = new Cosap("sk_live_x9f2…"); const invoice = await client.taxInvoices.create({ buyerBizNo: "120-86-00000", supplyAmount: 1500000, items: [{ name: "License" }], });
COSAP already runs finance, HR and accounting for real businesses. The same engine is exposed as a clean API so your product can read, write and automate against it.
Banking, cards, tax, HR and accounting behind a single authenticated REST surface — no per-source logins or separate vendors to stitch together.
Send bank and card transactions and get them auto-categorized into 20+ accounting categories, trained on Korean business spending patterns.
Subscribe to sync, classification and risk events. COSAP pushes updates to your endpoint the moment new data lands — no polling required.
Everything COSAP connects to or learns from is available as an endpoint. Grouped by what it does — explore the shape here, then dive into the full reference (coming soon).
One consistent response shape across every endpoint — typed fields, explicit errors and confidence scores your code can rely on in production.
Send a raw bank or card line and get back a category, confidence score and a ready-to-post journal entry. The same response shape across every endpoint.
POST /v1/classify { "description": "스타벅스 강남R점", "amount": 8500, "source": "card" }
{
"category": "meals_entertainment",
"confidence": 0.97,
"journal": {
"debit": "811 복리후생비",
"credit": "103 보통예금"
}
}
Call the API with plain HTTPS today, or reach for an official client library. Testing tools are on the way as we open up early access.
A simple path from credentials to live data. During early access, our team provisions your keys and helps you go live.
Tell us what you're building and which APIs you need. We provision credentials for your account.
Send your key as a Bearer token over HTTPS. Try everything safely in the sandbox before going live.
Hit any endpoint and handle the JSON response — or subscribe to a webhook and let COSAP push events to you.
You're handling tax and banking data, so the API is designed around isolation, verified sources and revocable access from day one.
Every request is scoped to your organization. Complete data isolation, enforced at every layer.
Tax data is sourced from official channels for zero-omission, audit-ready accuracy.
Financial logins are encrypted at rest and API keys are scoped and revocable at any time.
The same platform running real finance, HR and accounting operations every day.
Browse the full API reference, then request early access — tell us what you're building and we'll get your credentials set up.