OSA Procurement Guard MCP server

OSA

OSA is a machine-commerce trust and procurement system for evaluating agent/API endpoints before purchase or routing spend.

Core product

OSA combines live endpoint verification with historical evidence and produces a TrustScore plus confidence and reason codes.

• GET /best — rank matching endpoints by trust, intent and optional max price.
• GET /score — live-verify a registered endpoint.
• GET /history — return historical snapshots.
• POST /ingest — authenticated registry ingestion.
• POST /sources/mcp and POST /sources/bazaar — ingest MCP/Bazaar-shaped records.
• /.well-known/osa.json — machine-readable product metadata.

TrustScore currently considers uptime, latency, price stability, schema stability, payment stability and transaction evidence. Confidence is reported separately.

Architecture

OSA uses a split-plane design:

• Product/Data/Commercial plane — procurement/MCP distribution, pricing and benchmark history, endpoint observations, product usage, leads/deals and payment reconciliation.
• Control/Execution/Security plane — VPS agents, approvals, task policy, audit/control alerts, SSH bridge and certificate-only RAW SSH execution.
• GitHub — canonical source, CI/security scanning and controlled deployment workflows.

The split keeps product data workloads separate from privileged infrastructure execution.

Security

• Endpoint verification is read-only (GET/HEAD).
• SSRF defenses reject local/private/link-local/documentation targets and unsafe URL schemes.
• DNS results and redirect targets are revalidated.
• Response size, redirect count, timeouts and concurrency are bounded.
• Ingestion is authenticated in production.
• Privileged VPS execution uses short-lived SSH certificates and host-key verification.
• Secrets and private keys are not committed to this repository.

Commercial acquisition tool

npm run lead:audit -- https://example.com

The Lead-Leakage Audit performs a public-page, read-only conversion-path audit. It does not submit forms, authenticate, bypass controls or access private systems. It can be used as an evidence-first acquisition wedge for OSA services without becoming a separate product strategy.

Quick start

npm install
npm test
npm start

Payments

The public checkout exposes one human product: the $79 OSA 30-Day MCP Reliability Pilot. A buyer can request a private invoice/bank-transfer route or pay immediately with USDC on a verifier-backed network. Card and mobile-wallet buttons stay hidden until a live merchant rail is independently verified. Tap is owner-disabled. Optional x402 v2 middleware remains the machine-payment path for /best and /score when OSAPAYTO is configured. Requests, test events, page views, and wallet connections are never counted as revenue.

Operating rule

OSA is one product. Agent Trust Oracle, Procurement Guard, pricing/benchmark intelligence, MCP reliability and payment-rail checks are modules of the same pre-transaction decision system.

Progress means verified external usage, verified payment and repeat usage — not internal test rows, crawler probes, generated dashboards or speculative revenue.

Revenue-first gate

Before first verified external payment, OSA keeps one primary revenue path plus one backup and freezes generalized product/infrastructure/payment/browser/autonomy expansion unless it is the minimum fix for a named external blocker or a real safety incident.

Every non-trivial change should carry the decision record defined in knowledge/05-revenue-gate.md. Pull requests are checked by the Revenue Gate workflow. The governing distinction is strict: BUILT != VERIFIED != SELLING != PAID.

Ecosystem