GoBuy API & MCP — Documentation

https://mcp.gobuy.ai/mcp

Streamable HTTP, no authentication. Four tools:

{
  "check_product_trust": { "retailer": "amazon", "productId": "B0..." },
  "compare_products":    { "productIds": ["B0...", "B0..."] },
  "check_store_score":   { "domain": "allbirds.com" },
  "scan_store":          { "url": "https://any-store.com" }
}

check_product_trust — Evidence Score 0–100, review authenticity signals. check_store_score — Store Score 0–100, tier A–D, readiness + trust. scan_store — live scan of any unscored store (~20s).

Product trust score

GET https://gobuy.ai/api/gobuy/extension/score?retailer=amazon&productId=B0XXXXXXXX
→ { "score": 82, "label": "B", "state": "fresh", ... }

Store score (cached)

GET https://stores.gobuy.ai/store/{domain}?format=json
→ { "score": 52, "tier": "C", "readiness": 60, "trust": 39, ... }
404 = not scored yet → use scan

Store scan (live, ~20s)

POST https://stores.gobuy.ai/api/scan
{ "url": "https://any-store.com" }
→ { "ok": true, "store": { "score": 71, "tier": "B", ... } }

Fix files (llms.txt / robots.txt / agents.txt)

POST https://stores.gobuy.ai/api/fix
{ "domain": "any-store.com", "fixType": "llmstxt" }
→ { "ok": true, "filename": "llms.txt", "content": "..." }

Rate limits

Product trust reads (cached):
  60 requests/hour · 5,000/day — per key or IP

Store score lookups (cached, ?format=json):
  no dedicated cap — standard per-IP limits only

Live store scans (real crawls, POST /api/scan):
  5/minute · 20/day — per IP
  429 responses include Retry-After

No account, no key, no payment — all endpoints are free. An optional free API key (email only) grants higher limits — never required. No regional restrictions.

Any MCP client works — add https://mcp.gobuy.ai/mcp as a remote server, no auth. Works with Claude Desktop and Claude Code, Muse (ask it to create a Custom Connector with this entry point), ChatGPT custom connectors, Cursor, OpenClaw and any streamable-HTTP MCP client. Example prompts: "Are these reviews real? Check this product on GoBuy before I buy" · "Is this store legit? Check its GoBuy score before you order".