Which altcoins have partnerships with Ripple or are involved in cross-border payment solutions?

Several altcoins have partnerships with Ripple or are involved in cross-border payment solutions. Here are some examples:

1. **Santander's Cross-Border Payment Solution**: Santander, a leading global bank, has been exploring blockchain-based international transfers via RippleNet. This partnership could potentially utilize altcoins for cross-border payment solutions.
2. **BNY Mellon and Ripple's Stablecoin Partnership**: BNY Mellon, one of the world's largest custodians, has partnered with Ripple to hold reserves for its new stablecoin, Ripple USD (RLUSD). This partnership highlights the integration of altcoins within traditional financial systems.
3. **Cuallix's Ripple-Based Cross-Border Payments**: Cuallix, a financial company with a focus on Mexico, the United States, and Hong Kong, has been offering Ripple-based cross-border payments. They use xRapid, a Ripple tool that leverages XRP to make international payments cheaper and faster.
4. **Bitso's Crypto-Powered Payment Solutions**: Bitso, a digital asset platform, offers yield-earning products for various cryptocurrencies, including USDC, ETH, and SOL. While not directly partnered with Ripple, their focus on cross-border payments and digital asset facilitation could be complementary to Ripple's ecosystem.
5. **Deloitte's Blockchain Applications for Digital Payments**: Deloitte, a global consulting firm, has been involved in Ripple's blockchain applications for digital payments. Their work on blockchain and digital asset solutions could potentially intersect with altcoins used in cross-border payment scenarios.

These partnerships and collaborations highlight the growing integration of altcoins within cross-border payment solutions. As Ripple's ecosystem continues to expand, we can expect to see further developments in this space.