Hosted approval risk check for Base and EVM agents before signing token approvals or swaps: dangerous spender approvals, unlimited allowance exposure, approval-to-balance ratios, revoke-or-cap actions, and agent spend-control policy from fresh D1 wallet snapshots plus live allowance reads. Price 0.20 USDC on Base via x402. Demo: https://wallet-portfolio-history-mcp.mtree.workers.dev/demo/tools/approval_risk. Contact: https://wallet-portfolio-history-mcp.mtree.workers.dev/contact.

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