Migrating to the Oxylabs Web API

Two endpoints replace whatever is there: POST /v1/search finds URLs, POST /v1/scrape reads them. Base URL https://webapi.oxylabs.io, auth Authorization: Bearer $OXYLABS_WEB_API_KEY.

Read oxylabs-web-api for the endpoints themselves. This file is only about getting off the old one.

Do this first

# Which provider is actually in use, and where
grep -rniE "tavily|exa\.ai|firecrawl|perplexity\.ai|api\.search\.brave|linkup\.so" \
  --include='*.py' --include='*.ts' --include='*.js' --include='*.go' --include='*.rb' . \
  | grep -v node_modules
# And the keys they read
grep -rnoE "(TAVILY|EXA|FIRECRAWL|PERPLEXITY|BRAVE|LINKUP)_API_KEY" . | grep -v node_modules