E2X vs Knock: Which Is Better in 2026?

E2X is a Model-as-a-Service API platform for AI video generation, image generation, and related media models. It is built for developers and product teams that want to add media generation to their own applications without integrating each model separately. Teams load prepaid credits, create an API key, and make requests to supported models through a single API surface and a consistent request shape.

The model catalog provides the currently available models and their per-request prices before a call. A team can compare the supported options, estimate the cost of a workflow, and choose a model suited to its needs before generating. The catalog includes models from upstream providers such as Google, OpenAI, and ByteDance; availability may change as providers and supported models change, so current catalog details are the source of truth.

E2X uses prepaid, pay-as-you-go pricing. Credits are applied to requests, and published prices are shown per request; there are no recurring subscriptions, seat charges, or commitments. This makes it possible for teams to add a generation feature while keeping platform costs tied to actual usage rather than paying for a fixed number of seats. If a job fails, the request can be reviewed for credit where appropriate.

For example, a product team can build a creative workflow that accepts a prompt, routes a video or image generation request to a supported model, and returns the result to its users. The team can use one API key and a familiar request format while evaluating different models for quality, speed, and cost. The same account can support different media features in one application, without maintaining separate billing arrangements for each upstream provider.

E2X is a developer-facing API, not an autonomous agent or a consumer image editor. Its role is to provide a consistent way to access supported AI media models, with clear per-request pricing and prepaid usage. It is suited to builders who want to make video and image generation part of an app or service while keeping integration and billing straightforward.

Teams can start with one media workflow and expand to others as their product needs change. Supported models and per-request prices are presented together in the catalog, making it easier for developers to evaluate options before integration and keep the request path consistent when they change models. This is useful for applications where users create assets on demand and usage can vary from session to session.

Knock is a notifications infrastructure platform that gives developers a complete system for sending and managing product notifications across every channel — email, push, SMS, in-app feeds, Slack and more — without building and maintaining that complex infrastructure themselves. Notifications seem simple until you actually build them: you need cross-channel delivery, user preferences, batching and throttling, templates, routing logic, and reliability, all of which add up to a substantial, ongoing engineering effort that distracts from core product work. Knock handles it as a service.

The platform lets teams design notification workflows — defining what triggers a notification, which channels it goes to, how it's batched or delayed, and how user preferences are respected — through a combination of a powerful API and a visual dashboard. It manages the messy realities like respecting quiet hours, consolidating multiple events into digests, handling per-user channel preferences, and ensuring reliable delivery, while providing the templates and localization features needed for polished, on-brand notifications. It also includes ready-made components for in-app notification feeds, so adding a notification center to your product is straightforward.

This makes Knock valuable for any product that needs to keep users informed and engaged through notifications — which is to say nearly all modern software. By centralizing notification logic in one system, teams avoid scattering notification code throughout their codebase and gain the ability to manage, observe and iterate on their messaging easily. It frees developers from reinventing notification infrastructure and gives product teams control over a critical part of the user experience. As notifications grow more important for engagement and span ever more channels, dedicated infrastructure to manage them well becomes increasingly worthwhile. For development teams that want robust, cross-channel, preference-aware notifications without building and maintaining the underlying system, Knock offers a comprehensive, developer-friendly and genuinely useful platform.