CornerStone MCP x402 skill for agents. Tools for stock predictions, backtests, bank linking, and agent/borrower scores. Payment-protected MCP tools (run_prediction, run_backtest, link_bank_account, get_agent_reputation_score, get_borrower_score, by-email variants) 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、银行账户绑定、智能体与借款人评分等工具。支持支付保护的 MCP 工具（run_prediction、run_backtest、link_bank_account、get_agent_reputation_score、get_borrower_score 及其按邮箱变体），采用 x402 流程（Aptos + Base）。技能自动处理 402 → 支付 → 重试流程。支持钱包认证以完成入驻。专为智能体可自主下载并使用技能的市场平台设计。