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On testnets you can try sponsorship without a dashboard API key. Use the staging MEE environment and Biconomy’s shared testnet gas tank. No dashboard configuration, no API key with sponsorship enabled, and no billing setup required.
For general testnet setup (staging node URL, supported chains, limitations), see Working with Testnets.

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Testnet setup (no API key)

Use the SDK helpers getDefaultMEENetworkUrl and getDefaultMEENetworkApiKey with true to point to the staging environment where all supported testnets are available: 
import {
  createMeeClient,
  getDefaultMEENetworkUrl,
  getDefaultMEENetworkApiKey,
  getDefaultMeeGasTank,
  toMultichainNexusAccount,
  getMEEVersion,
  MEEVersion
} from "@biconomy/abstractjs";
import { http } from "viem";
import { baseSepolia } from "viem/chains";

const account = await toMultichainNexusAccount({
  signer,
  chainConfigurations: [
    { chain: baseSepolia, transport: http(), version: getMEEVersion(MEEVersion.V2_1_0) }
  ]
});

const meeClient = await createMeeClient({
  account,
  url: getDefaultMEENetworkUrl(true),
  apiKey: getDefaultMEENetworkApiKey(true)
});

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Execute sponsored supertransaction on testnet

When executing, pass sponsorship: true and use the same staging URL and shared gas tank via sponsorshipOptions: 
const result = await meeClient.execute({
  instructions: [dummyInstruction],
  sponsorship: true,
  sponsorshipOptions: {
    url: getDefaultMEENetworkUrl(true),
    gasTank: getDefaultMeeGasTank(true)
  },
});
getDefaultMeeGasTank(true) returns the testnet sponsorship gas tank used by the staging environment.

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Active testnets (staging)

The following testnet chains support sponsored transactions on staging:
ChainChain ID
Arc Testnet5042002
Avalanche Fuji Testnet43113
Base Sepolia84532
Chiliz Spicy Testnet88882
Fluent Testnet20994
Mocaverse Testnet222888
OP Sepolia11155420
Plasma Testnet9746
Sei Testnet1328
Sepolia11155111
Sonic Testnet14601
World Chain Sepolia4801

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Quickstart repos

You can run sponsorship on testnets with zero config using these quickstarts. Clone, install, and run—no API keys or private keys required:
  • Chiliz Spicy Testnet — git clone https://github.com/bcnmy/chiliz-spicy-quickstart.git then bun i and bun run index.ts
This example uses Nexus smart account and MEE supertransaction sponsorship (gasless) on staging.

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Moving to production

When you’re ready for mainnet, sponsorship does require dashboard setup. See Sponsor Gas for the full production configuration steps.