How to add token swaps to Spring Boot?

Add webflux starter, define records for SwapResponse/Data, inject WebClient service for api.swapapi.dev GET /v1/swap/{chainId}. Validate status and impact.

What's the best free API for token swaps?

api.swapapi.dev—no key, 46 EVM chains, returns calldata for any sender. Timeout at 15s, slippage 0.5% default.

Can Spring Boot handle blockchain production?

Absolutely—with WebClient reactive calls and BigDecimal validation. 17k+ prod users; pairs perfectly for fintech on-chain.

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Java's Enterprise Empire Goes On-Chain: Token Swaps in Spring Boot, No Keys Required

Picture this: Java, the backbone of 90% of Fortune 500 backends, now swapping ERC-20 tokens like it's 1995 all over again with servlets. A free API makes it dead simple—no SDKs, no hassle.

theAIcatchup Apr 08, 2026 4 min read

Spring Boot app integrating token swap API with blockchain calldata flowing to a wallet

⚡ Key Takeaways

Add token swaps to Spring Boot with one dep and a free API—no SDK or keys needed. 𝕏
Use records for JSON, WebClient for calls, validate price impact to protect users. 𝕏
Java's enterprise dominance meets DeFi: 40% of apps on-chain by 2030. 𝕏

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theAIcatchup

Community-driven. Code-first.

#DeFi API #Java DeFi #Java blockchain #Spring Boot #Web3 integration #blockchain-api #token swaps

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