Atomic single-fact endpoints designed for tight agent loops. Each answers ONE yes/no or one number — sub-50ms, flat $0.001/call at the REST surface. Two families: (1) DeFi facts sourced from our SQLite + shadow-blocks recorder (liquidatable, at-risk-count, recent-liquidations, top-builder, builder-share, builder-bid, block-value, cheapest-flashloan, data-freshness, address-risk, base-fee, proposer-payment); (2) privacy-chain facts sourced from Seneschal-operated full nodes — Monero (xmr/height, xmr/mempool, xmr/fee, xmr/fee-estimate, xmr/last-block) and Zcash (zec/height, zec/mempool, zec/last-block, zec/pools). Consult /v1/q for per-question input lists and live chain availability.