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Documentation Index

Fetch the complete documentation index at: https://flashnet-build.mintlify.app/llms.txt

Use this file to discover all available pages before exploring further.

The execution module ships viem-backed read helpers for the contract reads every integration ends up doing. Each function takes the rpcUrl directly so they work outside an ExecutionClient instance.

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Token info

import { fetchTokenInfo } from "@flashnet/sdk";

const info = await fetchTokenInfo(rpcUrl, tokenAddress);
// { address, symbol, name, decimals }
Reads symbol, name, and decimals in a single multicall. Throws if any of the three fails. Don’t catch the error and fall back to defaults — decimals: 0 masquerading as 18 will silently destroy your amount math.

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Balances

import { fetchTokenBalance, fetchNativeBalance } from "@flashnet/sdk";

const erc20Balance = await fetchTokenBalance(rpcUrl, tokenAddress, account);
const nativeBalance = await fetchNativeBalance(rpcUrl, account);
Both return bigint. fetchNativeBalance returns wei; divide by 10n ** 10n to get sats (Flashnet’s native unit is sats scaled to wei via 10^10).

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Allowances

import { fetchAllowance } from "@flashnet/sdk";

const allowance = await fetchAllowance(rpcUrl, tokenAddress, owner, spender);
For SparkToken ERC20s, prefer EIP-2612 Permit signatures over standing allowances — the swap path uses Permit and you avoid an extra approval transaction. See Swaps.

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Nonce

import { fetchNonce } from "@flashnet/sdk";

const nonce = await fetchNonce(rpcUrl, account);
Returns the next nonce to use for an outgoing transaction. Required when building a signed tx for ExecutionClient.execute.

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Fee parameters

import { fetchEip1559Fees } from "@flashnet/sdk/execution";

const fees = await fetchEip1559Fees(rpcUrl);
// { maxFeePerGas: 0n, maxPriorityFeePerGas: 0n } on Flashnet today
fetchEip1559Fees ships from the /execution subpath, not the root. The other read helpers on this page are re-exported at @flashnet/sdk directly. Flashnet runs zero-gas. The node correctly reports zero, but viem.estimateFeesPerGas() applies its own multipliers and floor that produce non-zero values. fetchEip1559Fees reads the raw node values without that adjustment. A future fee change (operator policy, partner chain) would surface here. Always fetch instead of hard-coding zero.

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Putting it together

The standard pre-flight before an execute intent: 
import { fetchNonce } from "@flashnet/sdk";
import { fetchEip1559Fees } from "@flashnet/sdk/execution";

const account = await execClient.getEvmAccount();
const [nonce, fees, { execution }] = await Promise.all([
  fetchNonce(rpcUrl, account.address),
  fetchEip1559Fees(rpcUrl),
  execClient.getNetworkInfo(),
]);

const signedTx = await account.signTransaction({
  chainId: execution.chainId,
  nonce,
  to: targetAddress,
  value: 0n,
  data: calldata,
  gas: 500_000n,
  ...fees,
  type: "eip1559",
});

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Multicall

fetchTokenInfo uses Multicall3 internally. The Multicall3 contract is deployed at the canonical cross-chain address (0xcA11bde05977b3631167028862bE2a173976CA11) on every Flashnet chain, so any tooling that already understands Multicall3 works without configuration. For your own batched reads, point a viem PublicClient at rpcUrl and pass multicallAddress: "0xcA11bde05977b3631167028862bE2a173976CA11".