# ScalpStream Research: machine-payable, impersonal research feeds over x402 (HTTP 402) - ranked 0-30 DTE options candidates, dividend and tax-free income, crypto scalp candidates, and risk-adjusted DeFi yields. Free previews with a board fingerprint (weak ETag) at /preview, /preview-dividends, /preview-crypto, /preview-yields; JSON Schema of every paid response at /schema; payment discovery at /.well-known/x402; A2A agent card at /.well-known/agent-card.json; A2A JSON-RPC at /a2a. Paid responses require the request header "X-Compliance-Attestation: not-sanctioned-party". Not investment advice.