Gasless Transaction Sponsorship With Andamio
Onboard users to Bitcoin, Cardano, and Spark apps without ADA, BTC, or friction. Sponsor fees, integrate passkeys, and ship faster with our dev-friendly SDK.
Access matters: across Cardano we're building great apps, but the real trick is getting people to use them.
— Andamio (@AndamioPlatform) October 24, 2025
With our partners at @utxos_dev, we're releasing transaction sponsorship features that make it easier to onboard people who want to use Andamio but don't yet hold ADA. pic.twitter.com/vEMCQXtlpy
In the UTXO world (Bitcoin, Cardano, Spark), access is everything. But users hit a wall when they need native tokens before they can do anything. For apps like Andamio, this kills conversions. Transaction sponsorship changes that: your app covers fees, users dive in gasless.
UTXOS makes it simple. Non-custodial WaaS with transaction sponsorship lets you sponsor complex eUTXO scripts, Bitcoin Ordinals, or Spark DeFi. Pair with passkey wallets for one-click creation with no seed phrases, just biometrics. Developers can embed via SDK in minutes.
"UTXOS tx sponsorship plus passkeys has been a game-changer for Andamio. Users onboard without ADA and we've 3x'd our engagement."
Why UTXO Tx Sponsorship Beats Account Models
Unlike EVM chains, UTXOs (eUTXO on Cardano) need precise fee calculation for inputs and outputs. The UTXOS SDK handles it: sponsor multi-contract transactions without user balances. Compared to Fireblocks, we're lighter (no heavy MPC), UTXO-focused, and startup-priced.
| Feature | UTXOS | Fireblocks | Alchemy |
|---|---|---|---|
| UTXO Native | Yes (BTC/Cardano/Spark) | Partial | EVM Focus |
| Passkey Integration | One-Click | Add-On | No |
| Dev SDK Ease | 5 Lines Code | Complex | EVM-Heavy |
Check this Andamio transaction: sponsored 0.328 ADA for 3 contracts, token mints, and staking with zero user balance.
Real Sponsored Tx: Andamio on Cardano
4e5a248af56db2041246770271296d94549a8ac77bbddf0a02600b7cc10d35eb
0.328425 ADA
3 (eUTXO Scripts)
3 Tokens (NFT Credentials)
- Staking withdrawal
- Multi-output to passkey wallets
- Reference scripts for efficiency
- Zero user ADA required
Integrate in Minutes: SDK Example
Sponsor a passkey user's transaction with just a few lines of JavaScript:
import { UTXOSSdk } from '@utxos/sdk';
const sdk = new UTXOSSdk({ apiKey: 'your-key' });
const sponsoredTx = await sdk.sponsorTransaction({
userWallet: passkeyWalletId,
chain: 'cardano',
actions: [{ type: 'mint', policy: 'andamio' }],
});
await sponsoredTx.submit();For Andamio: instant credential mints, no exchange hurdles. Scales to Bitcoin sats or Spark pools.
How UTXOS Tx Sponsorship Works
Passkey Sign
User creates and signs via biometrics. Zero balance is fine.
App Sponsors
SDK adds fees and co-signs. User and dev wallets both supported.
Chain Executes
Confirms on-chain. Analytics track ROI.
Transaction sponsorship plus passkeys is Web3's killer combo. Ditch the token barrier and let users love your product first. UTXOS is live on Bitcoin, Cardano, and Spark today.