Prerequisites: This tutorial assumes you’ve read the Enable MEE for EOA Users and understand EIP-7702 based execution and Fusion execution.
Gas sponsorship in Biconomy MEE allows developers to fully abstract gas costs from end-users—regardless of wallet type or chain. Whether you’re building on embedded wallets with EIP-7702, using native smart contract accounts, or orchestrating through Fusion from EOAs like MetaMask, MEE provides a unified, scalable sponsorship model.
Simplify Your Operations: One gas tank. Many chains. Sponsorships can be powered across all supported chains from a single gas tank and infrastructure.
This guide will:
  • Introduce sponsorship across EIP-7702, Fusion, and native SCAs
  • Help you choose the right flow for your app
  • Walk you through enabling sponsorship
  • Explain hosted vs self-hosted setups

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Sponsorship Basics

Biconomy’s gas sponsorship abstracts the need for end-users to hold native gas. This is ideal for:
  • Onboarding users unfamiliar with wallets
  • Consumer apps where gas UX is a blocker
  • Advanced orchestrations involving bridging or multicalls
Sponsorship is activated per-project via dashboard.biconomy.io and requires an apiKey in all requests.

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Choosing the Right Flow

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EIP-7702 Sponsorship (Embedded Wallets)

EIP-7702 lets you install smart account logic directly on EOAs, enabling orchestration and sponsorship with zero user effort. 
const quote = await meeClient.getQuote({
  sponsorship: true,
  instructions: [/* your calls here */],
  delegate: true,
  authorization // Required for 7702 accounts
});
Full Support: Supports all ERC-20s, multichain execution, and full transaction abstraction.
Best For: Embedded wallets (Privy, Dynamic, Turnkey, …)

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Fusion Sponsorship (External Wallets)

Fusion enables orchestration from EOAs (e.g. MetaMask) via a trigger + Companion Account pattern. It supports sponsorship, but with caveats:

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Requirements

  • Set sponsorship: true
  • Trigger token must support permit() (ERC-2612) to be truly gasless
  • Otherwise, user must have enough native gas to approve() token transfer
const quote = await meeClient.getFusionQuote({
  sponsorship: true,
  trigger: {
    amount: 1n,
    chainId: base.id,
    tokenAddress: usdcAddresses[base.id]
  },
  instructions: [/* your calls here */]
});
Best For: External Wallets - MetaMask, Trust, Rabby, Coinbase Wallet, Uniswap Wallet, …

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Native SCA Sponsorship (Deployed Accounts)

If you’re orchestrating via pre-deployed smart contract accounts, you can sponsor transactions as long as the orchestrator account is set and you pass the apiKey. 
const quote = await meeClient.getQuote({
  sponsorship: true,
  instructions: [instruction]
});
Works across any chain MEE supports. Best for dApps that deploy user accounts up front.

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Hosted vs Self-Hosted Sponsorship

  • No infra required
  • Uses Biconomy-managed gas tanks
  • Set up via dashboard
  • Supports post-paid modes with enterprise contracts or paying via credit card
const meeClient = await createMeeClient({
  account: orchestrator,
  apiKey: "your_project_api_key"
});

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Testnet Setup

On testnets, you’ll often want to use sponsorshipOptions to point to a testnet gas tank: 
const quote = await meeClient.getQuote({
  sponsorship: true,
  sponsorshipOptions: {
    url: DEFAULT_PATHFINDER_URL,
    gasTank: {
      address: DEFAULT_MEE_TESTNET_SPONSORSHIP_PAYMASTER_ACCOUNT,
      token: DEFAULT_MEE_TESTNET_SPONSORSHIP_TOKEN_ADDRESS,
      chainId: DEFAULT_MEE_TESTNET_SPONSORSHIP_CHAIN_ID
    }
  },
  instructions: [instruction]
});

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Discover Available Gas Tanks

List available tanks using: 
GET https://network.biconomy.io/v1/sponsorship/info
Or point to your self-hosted sponsorship URL to list custom tanks.

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Summary

  • Use EIP-7702 for embedded wallets — simplest and most powerful
  • Use Fusion for EOAs — ensure permit() or fallback gas is available
  • Use native SCAs if deploying and managing accounts
  • Start with Biconomy-hosted sponsorship; move to self-hosted as you scale
  • Sponsorship unlocks full UX abstraction with one gas tank across all chains
Sponsorship is the easiest way to eliminate onboarding friction and scale user-friendly smart account experiences.