Build on PropKaki. Singapore property intelligence, one API call away.
The engine behind PropKaki's app and WhatsApp assistant — stamp duty, affordability, valuations, transactions and market trends — inside your own product. One endpoint, one key, priced per call.
Get a key free — a S$5 trial credit is included. After that, you only pay per call.
curl -X POST https://www.propkaki.com/api/v1/ask \
-H "Authorization: Bearer pk_live_..." \
-H "Idempotency-Key: $(uuidgen)" \
-H "Content-Type: application/json" \
-d '{"question": "ABSD on a $1.8m second property for a Singapore Citizen?"}'{
"ok": true,
"type": "answer",
"answer": "ABSD is 20% — $360,000 on a $1.8M second property…",
"figures": [
{ "label": "stamp duty (SC property #2 @ $1.80M)",
"statement": "BSD $59,600, ABSD $360,000 (20%), total $419,600" }
],
"offer": { "label": "Run the full affordability check?", "accept_with": "yes" },
"sources": [{ "title": "Stamp duty & rates", "sourceName": "IRAS rates" }],
"tools_called": ["stamp_duty"],
"usage": { "op": "qa", "cost_cents": 35, "currency": "SGD" },
"conversation_id": "conv_01J8…",
"as_of": "May 2026"
}Not just prose. Every answer carries the figures it grounded as data, the sources behind them, and the next step it offered — send offer.accept_with back and it runs that next step.
Why Build on PropKaki
Grounded, Not Guessed
Every rate and figure comes from a dated store, never a model's memory — and each answer stamps its as_of. Models get Singapore's rules wrong; this doesn't.
Answers, Not Rows
You send a question, you get an answer — the same engine behind PropKaki's app and WhatsApp assistant, with 30+ property tools behind it.
Built for Machines
Idempotency keys mean a retry never double-bills. A conversation lock means concurrent turns can't corrupt state. Errors are typed, not prose.
What You Can Build
One question in, one grounded answer out — the same call powers very different products.
In-Product Answers
Embed a grounded Singapore property assistant in your portal, superapp or agent tool — prose verdict, figures and sources in one response.
Affordability & Stamp Duty
Run ABSD, BSD, TDSR and affordability checks inside your onboarding or mortgage flow. The numbers come back as data, not sentences to parse.
Valuations & Comps
Answer “is this price fair?” on your own project and listing pages — valuations grounded in real caveat data, with the comps behind them.
Market Research & Content
Town and district trends, HDB and private market reads, and rules lookups — every figure dated, so your content never quotes a stale rate.
CRM & Client Files
Log the figures each conversation committed straight to your CRM, and render the assistant's next-step offer as a native button in your UI.
Slides, Video & Paperwork
Listing decks, 9:16 listing videos and pre-filled paperwork as API jobs — the deliverables engine, behind gated scopes.
Conversations, Not Just Calls
Pass a conversation_id and it remembers the client's brief and the figures already on the table — so a follow-up like “and the ABSD on that?” just works. Delete a conversation any time; the memory goes with it.
Built for Production
The boring guarantees a machine caller actually needs — on every key from day one.
- Keys are stored as SHA-256 hashes — revoke and re-mint any time from the platform
- Scopes are per-key grants: gated capabilities are off by default, unlocked per customer
- Idempotency keys are required — a retried request replays the stored answer, never bills twice
- One turn per conversation at a time — a busy conversation returns a typed 409, not corrupted state
- Typed error contract: { code, message, request_id } — internal detail never reaches the wire
- Billing fails closed — if the credit wall can't be checked, we serve nothing rather than guess
- Per-key rate limits (60 requests/min by default), raised deliberately per customer
- Delete a conversation and its memory is actually erased — built for PDPA from day one
A Prepaid Wallet, Priced Per Call
Add funds by any amount, spend per call at published rates — no subscriptions, no packs, no minimum commitment. Failed calls are refunded in full.
Calculators, valuations, market reads, project and agent lookups
Live listings turns and heavy multi-tool analysis
One-time, when you mint your first key — then top up any amount from S$10
High volume, invoicing, listings access, media jobs or white-label? Those are per-customer unlocks — get a key and reach out from the platform.
Frequently Asked Questions
The short, plain answers to what the API is, where its answers come from, and how it's priced.
Start Building Today
Create a key on the platform, make your first call from the docs, and ship grounded property answers this afternoon.