builtwith

Troubleshooting

If requests fail, run zero doctor check-connector --env-name BUILTWITH_TOKEN or zero doctor check-connector --url https://api.builtwith.com/v21/api.json --method GET.

How to Use

BuiltWith authenticates with an API key passed as the KEY (uppercase) query parameter on every request. The base URL is https://api.builtwith.com.

1. Full technology profile for a domain

curl -s -G "https://api.builtwith.com/v21/api.json" \
  --data-urlencode "KEY=$BUILTWITH_TOKEN" \
  --data-urlencode "LOOKUP=stripe.com"

2. Domains using a specific technology

curl -s -G "https://api.builtwith.com/lists2/api.json" \
  --data-urlencode "KEY=$BUILTWITH_TOKEN" \
  --data-urlencode "TECH=Stripe"

3. Trends API (adoption history)

curl -s -G "https://api.builtwith.com/trends/v6/api.json" \
  --data-urlencode "KEY=$BUILTWITH_TOKEN" \
  --data-urlencode "TECH=Snowflake"

4. Company lookup (firmographics)

curl -s -G "https://api.builtwith.com/v14/companyApi.json" \
  --data-urlencode "KEY=$BUILTWITH_TOKEN" \
  --data-urlencode "LOOKUP=stripe.com"

5. Domain relationships

curl -s -G "https://api.builtwith.com/rv1/api.json" \
  --data-urlencode "KEY=$BUILTWITH_TOKEN" \
  --data-urlencode "LOOKUP=stripe.com"

Guidelines

Parameter casing matters — KEY (uppercase) and LOOKUP (uppercase) are required.
Pick the right product — v21/api.json (technology profile), lists2 (domain enumeration), trends (history), companyApi (firmographics).
Free tier is narrow — lists / trends require paid plans; the basic technology profile is included on most tiers.
Response is huge — domains can list hundreds of detected technologies; filter by category server-side via LIVEONLY=yes.
Combine with Hunter / Clado — pull tech stack, then find email contacts.