XRPL rail
XRPL as an agent-payment settlement adapter.
The XRPL lane is for destination tags, delivered amount checks, issued-asset validation, memo binding, final ledger validation, replay protection, reconciliation, and public proof.
What this means
Generic x402 clients may not understand XRPL by default. Wisely-compatible agents use the MCP server, skill, CLI, or HTTP helpers to read the challenge, sign the right XRPL payment, and return a receipt.