# LarryBuildsAI x402 Products, in Plain English

Preferred public URL: `https://proofbeforepay.vercel.app`

LarryBuildsAI sells proof before paid-agent spend. The product stack is intentionally split so buyers, agents, and marketplace reviewers can pick the smallest useful service.

| Product | What it does | Buyer question answered | Use it when | Entry point |
| --- | --- | --- | --- | --- |
| GateCheck | Checks whether a paid x402 or MCP route is ready for buyers and agents to test. | Can this route charge me, what proof exists, and should my agent proceed, ask for proof, fix first, or stop? | Use GateCheck before marketplace review, xpay wrapping, directory submission, X launch, or paid-agent traffic. | $1 quick readiness check, $10 buyer-safe report, $49 launch pack. |
| Signal Desk | Returns a small advisory buy, skip, stop, or ask-for-proof receipt before agents chain paid tools. | Should this agent buy the next paid call, use a cheaper first step, ask for proof, or stop? | Use Signal Desk before search, scraping, enrichment, model, market, or onchain tool chains. | $0.01-$0.03 advisory decision tools. |
| ResultRail | Quotes one public-data result before payment, then returns source-attributed result packs. | What exactly am I buying, what sources will prove it, and what happens if the result is partial or fails? | Use ResultRail when an agent needs one public domain or URL result with sources, timestamps, confidence, and receipt hashes. | Free direct quote; $0.12 domain result; $0.05 URL extract. |

## Fast Buyer Path

1. If you are launching or listing a paid x402/MCP route, start with GateCheck.
2. If an agent is about to chain paid tools, start with Signal Desk.
3. If an agent needs one public-data result, start with ResultRail.

## Public Links

- GateCheck: https://proofbeforepay.vercel.app/gatecheck | proof: https://proofbeforepay.vercel.app/gatecheck/routeability-card | MCP: https://proofbeforepay.vercel.app/gatecheck/mcp
- Signal Desk: https://proofbeforepay.vercel.app/signal-desk | proof: https://proofbeforepay.vercel.app/signal-desk/proof | MCP: https://proofbeforepay.vercel.app/signal-desk/mcp
- ResultRail: https://proofbeforepay.vercel.app/resultrail | proof: https://proofbeforepay.vercel.app/resultrail/proof | MCP: https://proofbeforepay.vercel.app/resultrail/mcp

Claim boundary: these are first-party product explanations and public evidence surfaces only. Do not infer marketplace approval, endorsement, customer adoption, revenue, settlement volume, compliance status, security certification, or public traction.