ExaLink API

Beta

REST

ExaLink API

Build trackable communication experiences with smart links and analytics. Shorten destinations, brand URLs, attach UTM parameters, gate access, and measure every click — from SMS, WhatsApp, email, or any channel.

Smart Short Links

Turn long destinations into clean short URLs on sndx.in with optional custom slugs.

Click Analytics

Track total clicks, unique visitors, countries, devices, referrers, and timeseries — all via API.

UTM Automation

Attach source, medium, campaign, term, and content parameters so every click is attribution-ready.

Access Controls

Password-protect links, set expiry timestamps, and cap max clicks for campaigns and gated content.

Real-time Webhooks

Receive exalink.click and exalink.converted events the moment users engage with your links.

Branded Domains

Serve links from your custom domain (e.g. go.yourbrand.com) once verified in the dashboard.

Redirect Latency

<50ms

p95 edge redirect

Analytics Delay

~1s

click to API visibility

Rate Limit

100/s

per API key

Max Clicks Cap

Unlimited

or set per link

Authentication

All REST requests use HTTP Basic Auth with your dashboard Base64 token: Authorization: Basic <token>. Auth guide →

Quick Start

Create your first trackable smart link in under a minute. Base URL: https://api.sendexa.co

Bash

curl -X POST 'https://api.sendexa.co/v1/exalink/links' \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Basic YOUR_DASHBOARD_BASE64_TOKEN' \
  -d '{
    "destination": "https://shop.example.com/summer-sale",
    "slug": "summer26",
    "title": "Summer Sale 2026",
    "utm": {
      "source": "sms",
      "medium": "campaign",
      "campaign": "summer_sale_2026"
    }
  }'

Response

JSON

{
  "success": true,
  "code": "LINK_CREATED",
  "message": "Smart link created successfully.",
  "requestId": "REQ-1782200144001",
  "timestamp": "2026-07-12T10:15:44.001Z",
  "data": {
    "id": "link_01HZXK9P2M7QVR8N4W3T6Y5B0A",
    "shortUrl": "https://sndx.in/summer26",
    "slug": "summer26",
    "domain": "sndx.in",
    "destination": "https://shop.example.com/summer-sale?utm_source=sms&utm_medium=campaign&utm_campaign=summer_sale_2026",
    "title": "Summer Sale 2026",
    "status": "active",
    "utm": {
      "source": "sms",
      "medium": "campaign",
      "campaign": "summer_sale_2026",
      "term": null,
      "content": null
    },
    "passwordProtected": false,
    "maxClicks": null,
    "expiresAt": null,
    "clicks": 0,
    "uniqueClicks": 0,
    "createdAt": "2026-07-12T10:15:44.001Z",
    "updatedAt": "2026-07-12T10:15:44.001Z"
  }
}

API Endpoints

All paths are relative to https://api.sendexa.co.

POST

/v1/exalink/links

Create Link

Create a trackable smart link with destination, slug, UTM, expiry, and access rules.

View docs

GET

/v1/exalink/links/:id

Get Link

Retrieve a single link's configuration, short URL, and lifetime counters.

View docs

PATCH

/v1/exalink/links/:id

Update Link

Change destination, title, UTM params, password, expiry, or pause the link.

View docs

GET

/v1/exalink/links/:id/analytics

Analytics

Clicks, countries, devices, referrers, and timeseries for a link or date range.

View docs

DELETE

/v1/exalink/links/:id

Delete Link

Permanently remove a link. Existing short URLs stop resolving immediately.

View docs

POST

Webhooks

Click & Conversion Events

Subscribe to exalink.click and exalink.converted for real-time engagement data.

View docs

How ExaLink Works

Create

POST a destination URL (and optional slug, domain, UTM, password, expiry).

Put the short URL in SMS, WhatsApp, email, QR codes, or ads.

Redirect

Users hit the short URL; ExaLink records the click and 302s to the destination.

Measure

Poll analytics or receive webhooks for every click and conversion.

Common Use Cases

SMS & WhatsApp CTAs

Keep messages short while tracking which campaign, segment, or sender ID drives the most clicks and conversions.

Gated downloads

Password-protect PDF or portal links, expire them after an event, or stop traffic after a max-click budget.

Campaign attribution

Standardize UTM tagging across channels and pull country/device breakdowns without a separate analytics stack.

Link Statuses

Status	Meaning	User experience
active	Link is live and accepting clicks	302 redirect to destination
paused	Temporarily disabled via PATCH	Shows paused / unavailable page
expired	expiresAt is in the past	Shows expired landing page
capped	maxClicks reached	Shows limit-reached page
deleted	Removed via DELETE	404 — link no longer exists

Common Error Codes

HTTP	Code	Cause
400	`INVALID_DESTINATION`	Destination is missing, not HTTPS/HTTP, or malformed
400	`INVALID_SLUG`	Slug has invalid characters or reserved words
401	`UNAUTHORIZED`	Missing or invalid Authorization header
403	`DOMAIN_NOT_VERIFIED`	Custom domain is not verified for this business
404	`LINK_NOT_FOUND`	Link id does not exist or belongs to another account
409	`SLUG_TAKEN`	Slug already in use on that domain
429	`RATE_LIMIT_EXCEEDED`	Exceeded 100 req/s — use exponential backoff

Best Practices

Always store the returned id and shortUrl so you can update links and pull analytics later
Prefer webhooks (exalink.click) over polling analytics for real-time dashboards
Use UTM objects on create — ExaLink merges them into the final redirect URL consistently
Set expiresAt on time-sensitive promos so stale links cannot be reused
Use custom domains for brand trust in consumer-facing SMS and ads
Implement exponential backoff on 429 responses

Beta status

ExaLink is in Beta. Short links use https://sndx.in/…. APIs are usable in production, but fields may gain optional properties before GA. Subscribe to the changelog for breaking-change notices.