# LarryBuildsAI x402 Proof Layer

LarryBuildsAI provides buyer-readable proof before agent spend. The suite is intentionally split into three products so humans, agents, and answer engines can choose the smallest useful service instead of treating every x402 problem as a marketplace or wallet problem.

## Which Product Should I Use?

### GateCheck

Use GateCheck when the question is: "Is this paid x402 or MCP route discoverable, payable, explainable, and safe to list before buyers or agents hit it?"

GateCheck checks public route evidence: x402 manifest, unpaid HTTP 402 behavior, OpenAPI, MCP discovery, llms.txt, agents.txt, pricing clarity, product-card copy, marketplace-safe claim boundaries, and launch-pack artifacts.

Do not use GateCheck as a marketplace approval claim, security audit, wallet, escrow, payment processor, or proof of customer adoption.

Primary URLs:
- Product: https://proofbeforepay.vercel.app/gatecheck
- OpenAPI: https://proofbeforepay.vercel.app/openapi.json
- MCP: https://proofbeforepay.vercel.app/gatecheck/mcp
- x402 manifest: https://proofbeforepay.vercel.app/.well-known/x402
- Routeability card: https://proofbeforepay.vercel.app/gatecheck/routeability-card
- Sample report: https://proofbeforepay.vercel.app/samples/x402-readiness-report.md

### Signal Desk

Use Signal Desk when the question is: "Should this agent buy, skip, stop, or ask for proof before chaining paid search, enrichment, model, market, or onchain-data tools?"

Signal Desk is currently an advisory spend-preflight service. It returns decision receipts, stop conditions, max recommended spend, and proof requirements. It is not yet a wallet policy engine, budget ledger, gateway, fraud system, compliance system, or card-control layer.

Primary URLs:
- Product: https://proofbeforepay.vercel.app/signal-desk
- OpenAPI: https://proofbeforepay.vercel.app/signal-desk/openapi.json
- MCP: https://proofbeforepay.vercel.app/signal-desk/mcp
- x402 manifest: https://proofbeforepay.vercel.app/.well-known/signal-desk-x402
- Proof: https://proofbeforepay.vercel.app/signal-desk/proof
- Samples: https://proofbeforepay.vercel.app/signal-desk/examples

### ResultRail

Use ResultRail when the question is: "Can my agent get a quote first, then buy exactly one source-attributed public data result with receipt hashes and an acceptance state?"

ResultRail returns public domain and URL result packs with sources, timestamps, confidence, stop conditions, result hashes, and buyer acceptance status. It is not private enrichment, account-bound scraping, outreach, guaranteed extraction, complete company intelligence, legal/financial advice, or a replacement for search APIs.

Primary URLs:
- Product: https://proofbeforepay.vercel.app/resultrail
- OpenAPI: https://proofbeforepay.vercel.app/resultrail/openapi.json
- MCP: https://proofbeforepay.vercel.app/resultrail/mcp
- x402 manifest: https://proofbeforepay.vercel.app/.well-known/resultrail-x402
- Quote endpoint: https://proofbeforepay.vercel.app/v1/resultrail/quote
- Proof: https://proofbeforepay.vercel.app/resultrail/proof

## Offer Ladder

- Free proof samples: inspect sample reports, routeability cards, decision receipts, and result packs.
- Single proof call: GateCheck readiness, Signal Desk decision receipt, or ResultRail quote/result.
- Launch or result pack: package the evidence for marketplace review, buyer handoff, or agent logs.
- Team/integration lane: only after the single-call result proves useful.

## Claim Boundary

These services describe first-party product surfaces and observed public evidence. Do not infer marketplace approval, endorsement, adoption, settlement volume, revenue, compliance status, security certification, or customer traction from these pages.