SendKuy API

One key, one set of endpoints, three channels.

Every object carries a prefixed id you can store and send back, every list is cursor-paginated, and every write can be made idempotent. Ids are opaque: msg_ is a message, con_ a contact, cmp_ a campaign — the prefix is part of the contract, so read them as strings and never parse what comes after the underscore.

Start here

• Quickstart — a key and your first message, in two minutes.
• Authentication — scopes, and what each one grants.
• Errors — every failure this API can answer with.

Then

• Idempotency — retry a write without doing it twice.
• Pagination — cursors, and the three endpoints that have none.
• Rate limits — per key, per minute, from your plan.
• Webhooks — we call you instead of you polling.

The full endpoint reference is in the sidebar, one page per operation.