CornerStone MCP x402 skill for agents. Tools for stock predictions, backtests, bank linking, and agent/borrower scores. Payment-protected MCP tools with x402 flow (Aptos + Base). Skill handles 402 → pay → retry. Wallet attestation for onboarding. For marketplaces where agents download and use skills autonomously.

CornerStone MCP x402 技能，适用于智能体。提供股票预测、回测、银行链接及智能体/借款人评分工具。支持支付保护的 MCP 工具，基于 x402 流程（Aptos + Base）。技能流程处理 402 → 支付 → 重试。支持钱包认证以完成入驻。适用于智能体自主下载和使用技能的市场平台。