inst8 for Developers
The inst8 SMS API — build two-way texting into anything.
A REST API over the same gateway that powers our HighLevel, HubSpot and Zoho integrations. Send from your own Android devices and SIMs, receive replies by webhook, and pay one flat fee — no per-message pricing.
Token auth in one click
Create scoped API tokens from your dashboard (Integrations → Developer API). Per-token permissions and rate limits, revocable instantly — never your account password.
Queued, carrier-safe sending
POST a message and the gateway queues and paces it through your SIMs automatically — the same anti-spam pacing our CRM integrations use. Batch up to 100 recipients per call, with idempotency keys so retries never double-send.
Two-way out of the box
Register a webhook and inbound replies are pushed to your endpoint as HMAC-signed events with the sender, device and SIM — or poll for them if you'd rather not host an endpoint.
Status, devices & opt-outs
Track every message from queued to sent to delivered. List devices and SIMs, manage the STOP-list, and check your balance through the same API.
How agencies actually use it
One inst8 plan. Multiple devices. Real numbers your customers can call back.
15
Endpoints
Account, devices, messages, webhooks, opt-outs — the full surface.
2-way
Messaging
Send and receive on real SIMs your customers can call back.
∞
Messages per month
Flat fee. Your SIM plan is the only ceiling.
Five-minute setup. No Twilio. No A2P.
Register, connect an Android, create a token — your first API message sends in under ten minutes.