The first market-intelligence API an AI agent can buy by itself. One question, one grounded answer, $0.50 — paid in-band over the open Machine Payments Protocol. No account. No API key. No subscription. The payment is the authentication.
GET the machine-readable how-to → Full API docsPOST https://quantlogix.ai/api/v1/agent-pay/answer?q=What+is+the+outlook+for+NVDA%3FThe server answers HTTP 402 with a signed WWW-Authenticate: Payment challenge.
npx @stripe/link-cli mpp pay "https://quantlogix.ai/api/v1/agent-pay/answer?q=..." -X POSTAny MPP wallet settles the challenge — Stripe's link-cli provisions a one-time Shared Payment Token after a human approves in their Link app. When the stablecoin rail is enabled the same challenge also carries a Tempo offer, so a wallet holding USD stablecoin (e.g. the mppx CLI) settles on-chain with no approval step.
5-factor signals across 5,000+ stocks and 4,900+ ETFs, fundamentals, multi-source news with sentiment, options flow and dealer positioning.
Valuations, investor graphs, IPO research and the graded QL Score across 2,100+ private companies — the coverage annual-contract incumbents keep behind sales calls.
Every answer's directional stances are graded against actual prices at T+30 on the same public machinery as QuantLogix's verified track record. Your question stays private; the record is verifiable.
$0.50
per answer — the card-network minimum. Live now.
$0.50
per answer — USD stablecoin on the Tempo network, settled on-chain with no human approval step.
Subscribers get the same engine metered on their plan at /api/v1/ask — no per-question payment. Agents can also refill their owner's AI credits at /api/v1/agent-pay/refill.
AI agents are becoming the largest consumers of market data — and every incumbent makes them sign up like a human: sales calls, annual contracts, API-key provisioning. QuantLogix is agent-native end to end: a 180+-tool MCP server, an agent SDK, and now a paid front door that any agent can walk through with nothing but a wallet. If you're building an agent, your integration is one HTTP request and one wallet command.
Answers are AI-generated market research, not investment advice. Payments settle via Stripe under the Machine Payments Protocol; unpaid challenge creation is rate-limited per IP. Answer records are private by default and graded against live market prices; grading methodology is published on the Intelligence Record page.