n8n community node for signing Solana transactions via @solana/keychain backends — Memory, Vault, AWS KMS, GCP KMS, Privy, Turnkey, Fireblocks, and more. New/experimental (v0.1.0).
Open payment standard built on HTTP 402 for instant stablecoin micropayments to APIs, agents, and content — multi-chain reference implementation by Coinbase.
