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Not Just Another Crypto Card

Olivia Capozzalo & Camila Russo
June 25, 2025

gm, Defiers!

Today’s big story:

  • The Mastercard + Chainlink integration introduces a new on-ramp to DeFi

Plus:

Read more below! But first, please give our sponsors some love; they make this newsletter possible.

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DIA launches $DIA Staking and Oracle Grants with 20 chains, including Arbitrum, BNB Chain, and Avalanche. Power your dApp with trustless oracles, cost-free.

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While banks warm up to stablecoins and fintechs retrofit them into legacy systems, DeFi is building for the ultimate use case: stables designed not just for moving capital, but for growing it. Sustainably.

A new generation of yield-bearing, institutional-grade stablecoins has emerged, going beyond payment rails as financial primitives in their own right. These composable, regulated stables are multi-asset backed, combining DeFi native performance with the resilience and trust of blue-chip RWAs. Their competitive APYs are counterbalanced by low risk profiles and compliance. These "all-weather" stablecoins are poised to scale beyond hype into long-term impact, but that means prioritizing the right infrastructure now.

Here's what that looks like — and why it matters for DAOs, institutions, and investors today.

Read more: Everyone’s Building with Stablecoins. Few Are Building Them Right

We’re back! Here’s what you need to know in web3 today

Why the Chainlink + Mastercard Integration Isn’t Just Another Crypto Card

“Crypto credit cards” have been sold as the bridge between digital assets and everyday spending — the promise that plastic can help turn tokens into fiat at a tap. But behind flashy marketing and crypto cash back offers lies the fact that, for better or worse, most of these cards are far from cypherpunk — they’re centralized, custodial solutions to turn your crypto to fiat at the checkout line.

The latest crypto x credit card company integration, between Chainlink and Mastercard, is interesting because it achieves the opposite. It lets users on-ramp fiat into DeFi, instead of off-ramping existing crypto holdings. Here’s how the main players stack up, and why this matters (beyond another loyalty-point giveaway).

Custodial Cards: Coinbase, Binance, Crypto.com

If you’ve ever loaded crypto onto a Coinbase, Binance, or Crypto.com card, you know the drill: deposit your tokens with the issuer’s custodial wallet, spend crypto when you want, and let the company handle the conversion behind the scenes.

  • Counterparty risk lives front and center. Your assets sit off-chain, pooled with everyone else’s, and you’re at the mercy of that issuer’s solvency.
  • Off-chain settlement means your on-chain identity ends the moment you swipe. There is no blockchain record of your purchase, just a fiat transaction on your statement.
  • Rewards structures are very similar to loyalty programs: 1–8 % back in native tokens, but only if you lock up or stake a minimum balance — and often subject to tier requirements.

MetaMask/Consensys Card: Self-Custody with Limits

MetaMask’s debit-style card takes a more self-custodial approach: your crypto stays in your wallet until the moment of purchase, when a Linea-powered smart contract sells exactly what you need, routes fiat via Mastercard and Baanx, then credits the merchant.

  • True self-custody until checkout, more aligned with DeFi.
  • On-chain settlement provides cryptographic receipts; you can verify every spend on-chain.
  • Yet it still remains an off-ramp only: you can’t buy new tokens via the card. It simply turns the crypto you already hold into spending power, without ever bringing fresh capital into your wallet.

Chainlink + Mastercard: A Genuine On-Ramp

By contrast, the Chainlink integration is specifically designed to streamline buying crypto on-chain with a standard bank card. Through a collaboration with Swapper Finance and compliant custodians, Mastercard’s network processes your fiat payment, a custodian mints the corresponding stablecoin, and Chainlink oracles trigger a DEX swap, all within a single widget.

  • No custodial pre-loading. You don’t need to move funds from your bank and onto an exchange or other app in advance.
  • On-chain trade execution. Every purchase generates an on-chain transaction, giving users true ownership.
  • Regulatory safeguards are baked in via licensed intermediaries, balancing ease of use with compliance.

Here’s how it actually works. First, Mastercard (via Shift4) processes your card payment and performs standard fraud and compliance checks. Approved funds instantly land with zerohash, a regulated custodian, which mints the exact amount of tokens.

Chainlink’s oracles then detect that mint event, fetch real-time DEX price data, and feed that into Swapper’s smart contracts. Those contracts automatically route tokens through the best liquidity paths on DEXs and deliver the final asset directly into users’ self-custody wallets, where they can spend those tokens. Every step, from fiat authorization to on-chain swap, produces a transparent blockchain receipt.

On the surface, it does seem strange: you’re taking dollars you already control in your bank account, charging them to your card, then immediately turning that same fiat into crypto, to spend again. Why not just tap your Visa at checkout? What’s the point of the extra crypto detour?

The answer lies in the destination, not the detour. Many web3 experiences, like NFT marketplaces, on-chain games, and DeFi protocols, simply don’t accept dollars. They require on-chain tokens held in a self-custody wallet.

By turning your card into a one-click on-ramp, this integration removes the traditional hurdles around on-ramping to DeFi: setting up exchange accounts, jumping through multiple KYC flows, sending crypto to your self-custody wallet, and making the jump to web3.

It’s tempting to dismiss any big-name partnership as PR theater, but the practical effects here seem tangible. Users can fund their wallet with exactly the amount of ETH they need for gas, or mint the precise USDC required for a stablecoin loan or NFT bid.

That zero-prep, zero-custody approach collapses the barrier between “I want to use web3 apps” and “I actually have on-chain assets to do it,” making decentralized finance and NFT culture as frictionless as ordering takeout.

With love,

Cami, founder of The Defiant

📈 Markets in the last 24 hrs:

TICKERVALUE24H
BitcoinBitcoin$107,362
1.32 %
EthereumEthereum$2,415.83
-2.05 %
XRPXRP$2.18
-0.76 %
BNBBNB$643.45
0.10 %
SolanaSolana$143.72
-0.95 %
MessariMessariPortals
MINDSHARE
Rank		MINDSHARE
% Change (7d)
Solana
Solana
SOL
6Solana
41.55%
Avalanche
Avalanche
AVAX
20Avalanche
28.95%
TRON
TRON
TRX
8TRON
-19.81%
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This is the news that mattered in the past 24 hrs

  1. Prediction market Polymarket has raised nearly $200 million in a funding round led by Peter Thiel’s Founders Fund, Reuters reported; the round would make the firm a unicorn, valued at over $1 billion.
  2. Public firms continue to implement the Strategy crypto treasury playbook, but with smaller-cap altcoins; yesterday, biomedical company Synaptogenix revealed its TAO treasury, while web3 firm Nano Labs said it’s aiming for a $1 billion BNB strategic reserve.
  3. The casino marketing company that became an ETH treasury firm, SharpLink Gaming, has added 12,207 ETH (about $30 million) to its balance sheet; the company now holds 188,478 ETH, making it the largest publicly traded ETH holder.

🎬WATCH

In the latest episode of The Defiant Podcast, Cami spoke with Emin Gün Sirer, CEO and Founder of Ava Labs. They discuss the growth of gaming on Avalanche, how the chain compares to other top Layer 1s, and the role of stablecoins and central banks in Avalanche’s ecosystem.

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