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.

WriteuseMutation Curated

useMintUnderlying

Mint standard (non-confidential) ERC-20 test tokens (TTT) to a recipient.

Import

@tokenops/sdk/testnet-faucet/react

Return

{ mutate, mutateAsync, isPending, error, data }

Lifecycle

Write

Description

Mint standard (non-confidential) ERC-20 test tokens (TTT) to a recipient. Open and permissionless on testnet. Use this when you want plain TTT — e.g. to then approve + wrap it into CTTT through the standard ERC-7984 flow.

Delegates 1:1 to TestnetFaucetClient.mintUnderlying.

Mutations do NOT auto-invalidate read queries. After a successful mint, invalidate every faucet query for fresh balances:

const queryClient = useQueryClient();
const mint = useMintUnderlying();
mint.mutate({ amount: 1_000_000_000_000_000_000_000n }, {
  onSuccess: () => {
    queryClient.invalidateQueries({ queryKey: ["tokenops-sdk", "testnet-faucet"] });
  },
});

Signature

@tokenops/sdk/testnet-faucet/react

function useMintUnderlying(options?: BaseHookOptions): UseMutationResult<MintUnderlyingResult, Error, UseMintUnderlyingArgs>;

Parameters

Shape of the object you pass to .mutate(args) is the SDK type UseMintUnderlyingArgs. Inspect the type for the full shape (discriminated unions collapse to a tagged variant at call time).

Run it

Connect your wallet and click Mint TTT with rc.1 — this dispatches a real Sepolia transaction through the same runner the stories use.

Interactive · live Sepolia tx

RecipientWhole TTT

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Console0 lines

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Example

@tokenops/sdk/testnet-faucet/react · @example

tsx

const mint = useMintUnderlying();
mint.mutate({ amount: 1_000_000_000_000_000_000_000n }); // 1,000 TTT (18-decimal units)
// mint.data → { hash, to, amount }

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

Errors

This mutation can reject with SDK-level, product-level, or generic-fallback errors. Product classes carry the offending value as fields — render them inline instead of a generic "transaction failed." See Testnet Faucet 2.0 › Errors for the per-class recovery table.

Invalidation recipe

After this mutation succeeds, invalidate the queries it affects so consumer UI re-fetches fresh state. The SDK never auto-invalidates — that's a consumer decision (different apps cache different shapes).

patterns/invalidation.ts

import { useQueryClient } from "@tanstack/react-query";

const queryClient = useQueryClient();
const mintUnderlying = useMintUnderlying(/* options */);

mintUnderlying.mutate(args, {
  onSuccess() {
    // Coarse invalidation: refresh every cached read on this product surface.
    queryClient.invalidateQueries({
      queryKey: ["tokenops-sdk", "testnet-faucet"],
    });
  },
});