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v2.0.0-rc.1 release candidate
The API is frozen and later candidates carry fixes only, except the receipt-free and Safe create surface of /fhe-airdrop, which is @beta. Published on the next dist-tag; latest stays on 1.6.0 until 2.0.0.
ReaduseQuery

useUnderlyingDecimals

Read the decimals of the underlying token (TTT) — 18.

Import
@tokenops/sdk/testnet-faucet/react
Return
{ data, isLoading, error, refetch }
Lifecycle
Read

Query Key

Faucet read hooks use the public constants TESTNET_FAUCET_KEY and TESTNET_FAUCET_NAMESPACE. The method segment for this hook is underlyingDecimals.

@tokenops/sdk/testnet-faucet/react
ts
queryKey: [
  "tokenops-sdk", // TESTNET_FAUCET_KEY
  "testnet-faucet", // TESTNET_FAUCET_NAMESPACE
  "underlyingDecimals",
  chainId ?? null,
  address ? address.toLowerCase() : null,
  // hook-specific args normalized: bigint -> decimal string, 0x strings -> lowercase
];

Signature

@tokenops/sdk/testnet-faucet/react
ts
function useUnderlyingDecimals(options?: BaseHookOptions & ReadHookQueryOptions<number>): UseQueryResult<number, Error>;
Want to run a similar shape interactively? The Playground ships 12 ready presets across vesting / airdrop / disperse / faucet — deploy a manager, create a vesting, claim, and run the product equivalents. The deep-link above auto-selects the closest preset to useUnderlyingDecimals; pick another from the dropdown if you'd rather start there.

Example

@tokenops/sdk/testnet-faucet/react · @example
tsx
const { data: decimals } = useUnderlyingDecimals(); // 18

Pulled directly from the hook's TSDoc block — the same snippet your IDE shows on hover.

See also

Other Read hooks in testnet faucet 2.0: