0x

DeFi

0x builds multi-chain trading APIs (EVM Swap, Gasless, Cross-Chain, Trade Analytics). Solana Swap API is in open beta (Aug 2026): POST /solana/swap-instructions returns quotes, routes, ALTs, and instructions — integrator signs and submits. SPL, native SOL, Token-2022.

Website @0xProject https://github.com/0xProject

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Infrastructure

ProofNetwork

Infrastructure for verifiable applications on Solana. Ships an MCP server that serves docs-as-a-tool for building proof-backed apps.

Payments

Circle

Issuer of USDC stablecoin

Multi-stablecoin payments infrastructure — unified API for accepting, routing, and settling across USDC, USDT, PYUSD and other stables on Solana and beyond.