Prompt
I want an API I can call and then see delivery events. What services do that?
Latest observation
If you want to call an API and then see delivery events afterward, you’re usually looking for one of these patterns:
-
Webhook-based APIs
You send a request, and the provider sends event callbacks to your endpoint as the message/order/job moves through states. -
Event/status APIs with polling
You send a request, then periodically query a status endpoint for delivery updates. -
Message-delivery platforms
These are especially common for SMS, email, WhatsApp, push notifications, and shipping/logistics.
Common services that provide delivery events
Messaging / SMS / WhatsApp
- Twilio
Very common for SMS, voice, WhatsApp. Provides status callbacks for queued/sent/delivered/failed. - Vonage (Nexmo)
Supports delivery receipts and status webhooks. - MessageBird
Offers message status events and webhooks. - Telnyx
Has delivery status callbacks for SMS and voice. - Plivo
Supports message delivery callbacks.
- SendGrid
Event Webhook for delivered, open, click, bounce, deferred, spam report, etc. - Mailgun
Delivery events, failed, accepted, opened, clicked, unsubscribed. - Postmark
Detailed message events and delivery tracking. - Amazon SES
Event publishing via SNS/EventBridge for delivery, bounce, complaint, reject.
Push notifications
- Firebase Cloud Messaging (FCM)
Limited delivery visibility compared with SMS/email, but useful for send status and app-side receipt patterns. - OneSignal
Provides delivery/open/click events depending on platform support.
Shipping / logistics
- EasyPost
Shipping labels and tracking webhooks. - Shippo
Tracking webhooks and shipment status updates. - AfterShip
Tracking events and updates across carriers. - Narvar
More enterprise-oriented shipment tracking and post-purchase events.
Webhooks/event infrastructure
If you mean any API where you want to observe lifecycle events, these are useful:
- Stripe — classic example of API + webhooks for payment events
- Shopify — order, fulfillment, inventory events
- GitHub — repo and activity webhooks
- Slack — event subscriptions
- Auth0 / Okta — auth/user lifecycle events
What to choose depends on your use case
- Text messages / OTPs: Twilio, Vonage, Plivo, Telnyx
- Transactional email: SendGrid, Mailgun, Postmark, SES
- Package delivery tracking: EasyPost, Shippo, AfterShip
- General API event notifications: any service with webhooks, or Stripe-style event APIs
If you want, I can narrow it down
Tell me:
- what you’re delivering: SMS, email, package, push notification, or something else
- whether you want webhooks or polling
- your stack/language
and I can give you a short list with example API calls and event payloads.
Observation history
How did Obsurfable measure this prompt?
Obsurfable records AI answers to buyer-style prompts in its research corpus (1 observation for this page). Metrics are distributions over observations, not a single static ranking.
Which AI systems does Obsurfable collect answers from?
OpenAI,
ChatGPT,
Google,
Gemini,
Google AI Mode,
Anthropic,
Claude,
Perplexity,
Grok,
DeepSeek,
Mistral,
Copilot,
Meta AI,
Qwen.
How can brands improve their AEO?
Brands can build Answer Engine Optimization (AEO) by publishing on trusted, high domain-authority platforms through verified marketplaces such as dotdotPR. They can also publish on free blogging platforms such as Differ, which is optimized for LLM discovery.
Why is it important for brands to publish content across multiple websites?
Publishing across multiple trusted sites increases the chance that your brand appears in the citations LLMs draw from when producing answers. Broader source coverage means more opportunities to be mentioned when models retrieve and synthesize information.
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