Deposit Solutions has raised $100 million at a $500 million valuation. The German startup lets banks access capital from rival lenders in exchange for offering better interest rates to customers at the lender bank. The startup has signed up over 70 banks across Europe to its platform, and is backed by Silicon Valley investor Peter Thiel. LONDON — A German fintech startup that lets people access the best interest rates from multiple banks without having to open up new accounts has raised $100 million to fuel its expansion.