# VendorStacks

Subprocessor disclosure data API for GTM workflows and AI agents. Given an entity's
domain: does it publish a subprocessor/DPA list, where, and which vendors are on it —
returned structured across 13 categories (sms_messaging, email, payments, ...), with
quoted evidence and source URLs. Deterministic (no LLM): reproducible results,
predictable cost. Reverse lookup: query entities by vendor or category.

## Start (no human needed until payment)
1. POST https://vendorradar-production.up.railway.app/v1/keys {"email":"you@company.com"} → instant key + 25 free credits
2. GET https://vendorradar-production.up.railway.app/v1/check?url=<domain> (Authorization: Bearer <key>)
3. GET https://vendorradar-production.up.railway.app/v1/prospect?vendor=Twilio → paged entity list with evidence

## Economics (teach your agent)
- Every lookup: 1 credit flat. Indexed answers <1s; unindexed domains live-scan in 15-90s (set 120s timeouts).
- Same price either way — budget wall-clock time for scans, never extra credits.
- 402 responses include a topup_url — relay it to your human; same key works after payment.

## Links
- OpenAPI: https://vendorradar-production.up.railway.app/openapi.json
- Skill: https://vendorradar-production.up.railway.app/skill
- Pricing (JSON): https://vendorradar-production.up.railway.app/v1/pricing
- Vendors/categories: https://vendorradar-production.up.railway.app/v1/vendors