Buy one intelligence result

Modes: hidden_chain $0.50, alpha $0.75, opportunity $1.00, global_brief $2.50, deep_research $5.00. The first request returns 402 with WWW-Authenticate: Payment (method stripe, intent charge, request = base64url JSON with amount in cents). Retry the identical request with Authorization: Payment <credential>. A failed payment returns a new challenge. Results are probabilistic intelligence; inferred edges and statistical lead/lag are hypotheses, not proof.