Dependency Preflight
Check before you install.Evaluate exact npm and PyPI package versions for security, licensing, lifecycle, and policy signals before an agent introduces them into a project.
Independent builder · production x402 services
Small services.
Big capabilities.
Built for the x402 economy.
Preflight Stack builds focused API services that AI agents and software can discover, pay for, and use on demand. One request. One payment. One useful answer.
Founder & Product Engineer · designing, shipping, and operating focused services for autonomous software.
How it works
1. Agent / AppNeeds a capability
2. x402 ProtocolHTTP-native payment
3. Focused ServiceProvides the requested capability
4. Structured ResultAgent continues its work
0.001–0.02 USDC per request today
x402
What is x402?
x402 is an open protocol for internet-native payments over HTTP. It lets software pay for resources as part of the request flow, which makes tiny pay-per-use services practical for autonomous agents.
Learn more about x402 →◎
Works with HTTPPayment fits into a normal web request flow.
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Pay only for useMicropayments per request instead of subscriptions.
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Open protocolA shared payment standard rather than a closed account system.
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Agent-nativeUseful for software that needs capabilities on demand.
The Preflight Stack
The Stack
Three narrow x402 services for dependency decisions, random selection, and temporary artifact handoff—available when autonomous software needs them.
Random Choice
Reliable randomness on demand.Provide 2–100 choices with optional relative weights. Receive one selection using cryptographically secure server-side randomness through a simple API.
Temporary File Relay
Temporary file handoff between agents.Create a paid, seven-day capability URL for passive files up to 250 MiB when two agents or systems do not share storage.
Design principle
One request. One payment. One useful answer.
Preflight Stack is intentionally composed of small services instead of a giant all-purpose platform. Agents can call only the capability they need, get machine-readable output, and continue working.
Focused
Each service solves a narrow problem with a clear input and output contract.
Composable
Services fit into larger autonomous workflows without forcing an account-heavy integration.
Discoverable
Public docs and OpenAPI contracts make capabilities understandable to both developers and agents.
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Built for the future of autonomous software
See the decisions, boundaries, and live proof behind the stack.