useRPC

```ts
import type { ApiPromise } from '@polkadot/api'

export function getMetadata(api: ApiPromise) {
return api.query.nft.instances
}

export function getMarketplaceData(api: ApiPromise) {
return api.query.nft.instances
}

export function getPrice(api: ApiPromise) {
return api.query.marketplace.prices
}

export function getOffers(api: ApiPromise) {
return api.query.marketplace.offers.keys
}

export function getOwner(api: ApiPromise) {
return api.query.uniques.asset
}

export function hasAllPallets(api: ApiPromise): boolean {
return [api.query.uniques, api.query.nft, api.query.marketplace].every(
(pallet) => pallet
)
}
```

We should have fallback RPC utils in case subsquid wont work

REF:
-

- kodadot/nft-gallery/pull/6443

Start with the getMetadata, getMarketplaceData, getPrice, getOffers, getOwner, and hasAllPallets entry points shown in the issue, and inspect how Subsquid currently supplies this data. Clarify the fallback behavior and the package entry point before implementing it. Done should provide RPC-based fallback utilities for the listed queries when Subsquid is unavailable, with tests or documented verification for the pallet checks.

Written by the indexing model from the issue text.