Batched and Sponsored: Leveraging EIP-5792 for Frictionless Sniping on frfr.fun

In the hyper-accelerated world of Web3 and decentralized finance, speed isn't just an advantage — it's the entire game. This reality is magnified tenfold in the memecoin ecosystem, where the lifecycle of a token from launch to price discovery can unfold in minutes. On networks like Base, where liquidity pools form rapidly and automated AI agents execute trades at machine speed, retail traders face an uphill battle against latency, multi-click wallet confirmations, and volatile gas fees.

Historically, executing a trade on a decentralized exchange or a token launchpad required navigating a gauntlet of UX bottlenecks: tracking gas prices, ensuring you hold enough native ETH, approving a smart contract to spend your tokens, and finally executing the swap. Each step introduces a delay, a transaction fee, and a point of failure.

Enter EIP-5792, the Ethereum Improvement Proposal that defines the Wallet Call API. Originally proposed in October 2022 and officially finalized in May 2025, EIP-5792 standardizes how decentralized applications communicate complex execution paths to smart contract wallets. It unlocks two capabilities out of the box: transaction batching and gas sponsorship.

On frfr.fun, a memecoin launchpad built on Base, EIP-5792 is used to abstract away the friction of on-chain trading entirely. This article explores how frfr.fun implements EIP-5792 to deliver a true one-click experience, combining token approvals and token swaps into a single, atomic, sponsored transaction.

1. The Anatomy of On-Chain Friction

To appreciate what EIP-5792 solves, consider the traditional ERC-20 interaction model. A standard purchase workflow for a memecoin on an Automated Market Maker looks like this:

Step 1 — approve(address spender, uint256 amount): The user calls the token contract to grant the router permission to spend their input token (e.g., USDC). This is a separate signature and an independent network transaction.

Step 2 — Wait for confirmation: The user waits for the approval to be included in a block. On a congested network, the price of the target token can move dramatically before the approval clears.

Step 3 — swapExactTokensForTokens(...): Once approved, the user submits a second transaction to execute the actual trade.

Step 4 — Gas accounting: Throughout all of this, the user must hold native ETH on Base to pay gas. If their wallet runs dry, the trade fails entirely.

For high-frequency traders and autonomous AI agents — whether running on Coinbase's AgentKit or custom frameworks — this four-step sequence is unacceptable. It drains capital efficiency, creates slippage risk, and introduces asynchronous timing complexity into otherwise clean codebases.

2. EIP-5792: The Wallet Call API

EIP-5792 defines a set of JSON-RPC methods that allow dApps to request advanced execution capabilities from a user's wallet. Unlike eth_sendTransaction, which handles a single call at a time, EIP-5792 treats transactions as an array of structured calls that can be bundled, conditioned, and sponsored.

The spec introduces four JSON-RPC methods:

wallet_getCapabilities — Queries what advanced features the connected wallet supports for a given address and chain, including atomic batching and paymaster service support.
wallet_sendCalls — Accepts an array of transaction payloads, enabling the dApp to request that multiple actions execute within a single atomic block. The current API version is 2.0.0.
wallet_getCallsStatus — Asynchronously tracks the status of a submitted call bundle by its returned identifier.
wallet_showCallsStatus — Requests that the wallet display information about a specific call bundle to the user.

Atomic execution guarantees

The EIP-5792 spec is explicit about atomicity requirements. When atomicRequired is set to true in a wallet_sendCalls request, the wallet must execute all calls atomically — meaning either all calls succeed or no material on-chain effects appear. The wallet must also execute the calls contiguously, so no other transactions can be interleaved with the batch. This is the precise property that closes the window for front-running between an approval and a swap.

Gas sponsorship via ERC-7677

The paymasterService capability in EIP-5792 is standardized by a companion spec, ERC-7677 (Paymaster Web Service Capability). When a dApp includes a paymasterService URL in its wallet_sendCalls request, a compliant wallet makes two RPC calls to that URL: one to retrieve stub paymaster values for gas estimation, and one to retrieve the signed paymaster data for the actual UserOperation. The wallet uses these values to route the bundled transaction through the paymaster rather than charging the user for gas. Applications must not assume their paymaster will always be used — a user's wallet may override with its own paymaster, or the paymaster service may be unavailable.

3. EIP-5792 in the Ecosystem: Status and Wallet Support

EIP-5792 was officially finalized in May 2025, coinciding with the activation of EIP-7702 on Ethereum mainnet via the Pectra upgrade (May 7, 2025). The relationship between the two standards matters: EIP-7702 allows existing Externally Owned Accounts (EOAs) to temporarily delegate to a smart contract, gaining the ability to batch transactions and accept gas sponsorship — the precise capabilities EIP-5792 exposes at the RPC layer. Most wallets implement EIP-7702 first, stabilize the UX, then layer on EIP-5792 support.

As of mid-2026, the following wallets have confirmed EIP-5792 support (this list is non-exhaustive and maintained at eip5792.xyz):

Coinbase Smart Wallet (native integration)
MetaMask (atomic batch support via Smart Accounts, built on EIP-7702)
Safe{Wallet}
Ambire Wallet
Reown AppKit Embedded Wallet
thirdweb In-App and Smart Wallets
Openfort
Abstract Global Wallet
TokenPocket

An important caveat for developers: Wallet adoption is still rolling out. As WalletConnect's analysis noted, wallet_sendCalls represents a small fraction of daily transaction volume compared to legacy methods like eth_sendTransaction. This means any production integration must include a fallback path. Viem's sendCalls action supports an experimental_fallback flag that reverts to sequential eth_sendTransaction calls when a wallet does not support EIP-5792. Thirdweb's Connect SDK does the same. Always wrap wallet_sendCalls in a try/catch and query wallet_getCapabilities before deciding whether to use the batched path.

Key tooling that supports EIP-5792 natively includes Viem (v2+, with sendCalls as a stable first-class action under the wallet client), Wagmi (sendCalls via @wagmi/core), and Base's own developer documentation under the Base Account reference.

Note: An earlier version of Viem exposed EIP-5792 via walletActionsEip5792 from viem/experimental. That export has been removed. The correct import path is now eip5792Actions from viem/experimental for clients that need to extend with EIP-5792, or the standard walletClient.sendCalls method directly in recent Viem versions.

4. How frfr.fun Implements EIP-5792 for One-Click Trading

On frfr.fun, every millisecond matters. When an autonomous memecoin launch fires, or an AI agent triggers a liquidity event, human traders need execution parity with algorithmic scripts. By embedding EIP-5792 into its core trading flow, frfr.fun compresses the traditional four-step approval-and-swap sequence into a single user interaction.

Step 1: Capability Discovery

Before initiating any trade, frfr.fun queries the connected wallet to verify support for atomic batching and gas sponsorship. The chainId being checked here is 0x2105, which is Base Mainnet (chain ID 8453 in decimal).

const capabilities = await window.ethereum.request({
  method: 'wallet_getCapabilities',
  params: [userAddress],
});

const chainId = '0x2105'; // Base Mainnet
const supportsAtomicBatch = capabilities[chainId]?.atomic?.status === 'supported';
const supportsPaymaster  = capabilities[chainId]?.paymasterService?.supported === true;

If the wallet does not return affirmative capabilities for the batch or paymaster, frfr.fun falls back to the traditional sequential flow to ensure all users can still trade.

Step 2: Constructing the Call Payload

When capabilities check out, frfr.fun skips the two-click UI entirely and builds a unified payload. For a user swapping 10 USDC (6-decimal token, so 10_000_000 raw units) for a newly launched memecoin, the application constructs two calls:

Call 1: Targets the USDC ERC-20 contract — approve(frfrRouterAddress, 10_000_000)
Call 2: Targets the frfr router — the precise swap function to acquire the memecoin asset

Both calls share the same from address and chainId. They will either both execute or neither will.

Step 3: Submitting via wallet_sendCalls with Paymaster

frfr.fun injects its sponsored paymaster URL into the capabilities field, instructing the wallet to route gas costs through the application's paymaster service rather than the user's ETH balance. The version field must be "2.0.0" per the finalized EIP-5792 spec.

const paymasterUrl = "https://api.frfr.fun/v1/paymaster";

const { id: bundleId } = await window.ethereum.request({
  method: 'wallet_sendCalls',
  params: [{
    version: '2.0.0',
    chainId: '0x2105', // Base Mainnet (8453)
    from: userAddress,
    atomicRequired: true,
    calls: [
      {
        to: usdcTokenAddress,
        data: usdcContract.interface.encodeFunctionData('approve', [
          frfrRouterAddress,
          amountInWei
        ]),
        value: '0x00'
      },
      {
        to: frfrRouterAddress,
        data: frfrRouterContract.interface.encodeFunctionData('swapExactTokensForTokens', [
          amountInWei,
          minAmountOutWei,
          [usdcTokenAddress, memeTokenAddress],
          userAddress,
          deadline
        ]),
        value: '0x00'
      }
    ],
    capabilities: {
      paymasterService: { url: paymasterUrl },
    }
  }]
});

The atomicRequired: true flag instructs the wallet to reject the bundle if it cannot guarantee atomic execution. This is a deliberate safety choice — a non-atomic execution would leave the user with an open approval and no swap, re-introducing the front-running window EIP-5792 is designed to close.

Step 4: Atomic Execution and Status Tracking

When the user clicks "Buy," their wallet presents a single verification screen that bundles the approval and the swap. If the paymaster is engaged, the gas fee line shows zero. Both operations are submitted as one cryptographic payload. The Base network processes them in the same block, in order, with no interleaved transactions possible.

frfr.fun then polls for status using the returned bundle identifier:

const pollStatus = async () => {
  const status = await window.ethereum.request({
    method: 'wallet_getCallsStatus',
    params: [bundleId]
  });

  if (status.status === 'CONFIRMED') {
    console.log('Trade executed. Block:', status.receipts[0].blockNumber);
  } else if (status.status === 'PENDING') {
    setTimeout(pollStatus, 1000);
  }
};

pollStatus();

5. Why This Architecture Changes the Trading Environment

Elimination of the approval-swap time delta

In traditional memecoin trading, price can move materially between the time you submit an approval and the time your swap lands. atomicRequired: true on wallet_sendCalls eliminates this window entirely. The approval and the swap are part of the same execution frame. There is no gap for a front-running bot to step into.

True gas abstraction

One of the largest barriers to onboarding in Web3 is gas management. Forcing a user to bridge or deposit ETH to Base just to buy a token limits participation. With ERC-7677-compliant paymaster sponsorship, frfr.fun allows users to fund with USDC and trade immediately. The platform underwrites the marginal gas cost — typically fractions of a cent on Base — to maximize ecosystem velocity.

Risks and honest caveats

EIP-5792 is a meaningful UX improvement, but a few limitations are worth stating plainly:

Incomplete wallet coverage. Not all wallets support EIP-5792 yet, and coverage varies by chain. frfr.fun must maintain a fallback code path. Any implementation that assumes EIP-5792 support without wallet_getCapabilities will produce failures for a significant portion of users.

Paymaster reliability. ERC-7677 explicitly notes that applications must not assume their paymaster will be used. If the paymaster service is unavailable or the user's wallet overrides it, the transaction falls back to user-paid gas. If the user has no ETH on Base, it will fail. Transparent UI communication about this is essential.

EIP-7702 dependency for EOAs. Most standard EOA wallets (e.g., MetaMask in default mode) require EIP-7702 delegation before they can support atomic batching via EIP-5792. This introduces smart-contract delegation risk. While major wallets undergo rigorous audits, the added complexity relative to a plain EOA is a real, if small, trade-off.

Adoption is still early. As WalletConnect's September 2025 analysis of usage data showed, wallet_sendCalls transactions remain a small fraction of overall volume. Institutional and retail dominance of eth_sendTransaction means developers should plan for long-tail fallback support.

Alignment with AI autonomous agents

As AI-driven agents become participants in token economies — launching projects, executing buybacks, managing liquidity — complex execution loops must be streamlined. EIP-5792 gives agents a clean JSON-RPC interface to batch operations, optimize gas, and minimize the state latency that bot scripts must manage. Coinbase's AgentKit and similar frameworks can express multi-step strategies as a single call bundle, reducing the operational surface area for errors.

6. Developer Integration Guide

If you are building an automated trading bot, an external dashboard, or an AI agent designed to interact with frfr.fun on Base, using EIP-5792 natively is the recommended path. The following uses Viem, the current standard TypeScript library for EVM interactions.

Note: The walletActionsEip5792 export from viem/experimental has been removed in recent Viem versions. Use eip5792Actions if you need to extend a client, or use walletClient.sendCalls directly.

import { createWalletClient, custom, parseAbi } from 'viem';
import { base } from 'viem/chains';
import { eip5792Actions } from 'viem/experimental';

const client = createWalletClient({
  chain: base,
  transport: custom(window.ethereum),
}).extend(eip5792Actions());

async function executeSnipe(
  tokenIn: `0x${string}`,
  tokenOut: `0x${string}`,
  amount: bigint
) {
  const [account] = await client.getAddresses();

  // Check capabilities first
  const capabilities = await client.getCapabilities({ account });
  const baseChainId = base.id.toString(16);
  const supportsAtomic = capabilities[`0x${baseChainId}`]?.atomic?.status === 'supported';

  if (!supportsAtomic) {
    // Fall back to sequential eth_sendTransaction
    throw new Error('Wallet does not support atomic batching on Base');
  }

  const { id: bundleId } = await client.sendCalls({
    account,
    calls: [
      {
        to: tokenIn,
        abi: parseAbi(['function approve(address,uint256) returns (bool)']),
        functionName: 'approve',
        args: [frfrRouterAddress, amount],
      },
      {
        to: frfrRouterAddress,
        abi: parseAbi(['function swapExactTokensForTokens(uint256,uint256,address[],address,uint256) returns (uint256[])']),
        functionName: 'swapExactTokensForTokens',
        args: [amount, minAmountOut, [tokenIn, tokenOut], account, deadline],
      }
    ],
    capabilities: {
      paymasterService: { url: 'https://api.frfr.fun/v1/paymaster' }
    }
  });

  return bundleId;
}

Architectural checklist for production integrations:

Always call wallet_getCapabilities before using wallet_sendCalls — never assume support. Implement a sequential fallback via eth_sendTransaction for wallets that return no atomic capability for Base. Wrap the entire sendCalls call in a try/catch; non-supporting wallets may throw rather than return an error code. Set atomicRequired: true when your logic requires the approval and swap to be inseparable. Test against multiple wallet implementations — subtle behavioral differences exist between MetaMask, Coinbase Smart Wallet, and Ambire.

7. The Broader Context: Account Abstraction Converging on a Standard

EIP-5792 does not exist in isolation. It sits at the intersection of several converging account abstraction standards:

ERC-4337 established the infrastructure for smart contract wallets — bundlers, paymasters, and UserOperation objects — without requiring protocol-level changes. EIP-5792 provides the application-layer RPC interface that dApps use to reach this infrastructure.

EIP-7702, activated with Pectra in May 2025, extended these capabilities to existing EOAs by allowing them to temporarily delegate to a smart contract for the duration of a transaction. This is what makes it possible for a standard MetaMask address — one users have held for years — to participate in atomic batching without migrating to a new address.

ERC-7677 standardizes the paymaster communication protocol that EIP-5792 references but does not itself define, creating a vendor-neutral interface for app-sponsored gas.

Together, these three standards form the practical account abstraction stack for 2025 and beyond. EIP-5792 is the user-facing surface. The clunky multi-step wallet confirmations that defined early DeFi are being systematically replaced — not by breaking changes, but by layered standards that leave existing accounts intact.

8. Conclusion

The combination of low-cost Layer 2 infrastructure, a finalized Wallet Call API, and practical paymaster tooling gives platforms like frfr.fun the building blocks to deliver consumer-grade trading UX. Whether you are a human trader scanning new launches on Base or an autonomous AI agent parsing liquidity events, the path from discovery to execution is now expressible as a single, atomic, sponsored interaction.

Adoption is still growing. Wallet coverage is not universal. Fallback paths are not optional. But the standard is finalized, the tooling is production-ready, and the economics of gas sponsorship on Base are low enough that application-layer subsidization is tractable.

The era of missing a launch because of an unconfirmed approval is ending. frfr.fun is building for the version of Web3 where that's already the default.