Drip

Paid API for searching and browsing Drip's premium financial newsletters and podcasts, resolving publications and direct post links, and purchasing synthesized post summaries for investing research and market analysis. ## Payment Flow Paid routes return HTTP 402 with a dual challenge. Use an x402 or MPP payment-aware client. 1. Plain request returns 402 with `WWW-Authenticate` (MPP) and `PAYMENT-REQUIRED` (x402) headers. 2. Retry the same request through a payment-aware client, or manually with `Authorization: Payment <credential>` (MPP) or `PAYMENT-SIGNATURE` header (x402). 3. On success (200), response includes `synthesizedSummary` and `paymentInfo`. **Pricing:** Discovery `x-payment-info.offers[]` is advisory. Runtime 402 challenge is authoritative. Price may scale with content (e.g. stock-picks by source article count). Use free `GET /api/v1/stock-picks/quote` to preflight the stock-picks bundle total; live `402` on the paid route remains authoritative for payment clients. **Error codes:** 402 = payment required, do not retry without payment. 503 = summary not ready, retry later. 404 = content not found, do not pay.