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Tollbooth

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Tollbooth — 59 verified tax, finance, lending, real-estate, retirement, investing, crypto and business calculators for AI agents, paid per call in USDC on Base mainnet (no account, no API key; $0.01–$1.00 per call via the Coinbase CDP facilitator). Every answer ships a formula/method trace, cited sources with a 2026 data-vintage stamp, and a reproducible SHA-256 hash over the RFC 8785 (JCS) canonical fixed point {en…

unclaimedpaid_usage_verifiedbuy here · x402
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Seller site: https://x402toll.com · JSON · kit.json · buy here: /api/v1/call/x402.tollbooth
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