@polkadot-apps/productkit

Minimal app-facing product contract and helpers for apps that consume window.host.

Install

npm install @polkadot-apps/productkit

Use this package when you want a narrow, product-oriented runtime surface:

• getAddress()
• storage.get/set/remove
• statements.subscribe/write/status
• on("statement") / off("statement")

Adapters such as @polkadot-apps/productkit-adapter-scale mount real host implementations onto this contract.

Positioning

@polkadot-apps/productkit is the supported narrow compatibility layer for product code that consumes window.host.

• use @polkadot-apps/productkit when you only need address, storage, and statements, or when you need compatibility with an existing ProductKit host
• use @polkadot-apps/product-sdk for the normal high-level product path in this repo's ecosystem
• use @polkadot/api-protocol if you need the canonical full host-product contract or want to build a custom facade/transport layer

ProductKit is not deprecated, but it intentionally stays smaller than the full api-protocol surface.

Minimal example

import { hasCoreProductKit } from "@polkadot-apps/productkit";

if (!hasCoreProductKit(window.host)) {
  throw new Error("ProductKit surface unavailable");
}

const address = await window.host.getAddress();
await window.host.storage.set("last-address", address);

window.host.on("statement", (event) => {
  console.log(event);
});

Compatibility

• product-side package
• expects a host shell that provides the ProductKit-compatible window.host surface

Documentation

• Web product guide: https://github.com/paritytech/host-sdk/blob/main/site/src/content/docs/getting-started/web-product.md
• Positioning: https://github.com/paritytech/host-sdk/blob/main/site/src/content/docs/ecosystem/productkit-vs-api-protocol.md
• Migration guide: https://github.com/paritytech/host-sdk/blob/main/site/src/content/docs/ecosystem/productkit-migration.md
• Quickstart: https://github.com/paritytech/host-sdk/blob/main/site/src/content/docs/getting-started/index.md