ucp.trychannel3.com. It speaks UCP (Universal Commerce Protocol), so shopping agents can search and look up products without learning a custom Channel3 API.
For most agents, MCP is the simpler approach. See MCP. Examples in this section show UCP CLI and curl side by side.
What you can do
Extra filters and store details live in the
com.trychannel3.catalog.global extension. See Extension reference.
Two URLs to know
Auth
Channel3 supports two tiers. See Authentication and Rate limits.
You do not need to host your own UCP profile to use the catalog — Channel3’s profile above is enough. See About profiles.
UCP CLI note: Without a key, CLI commands run as Anonymous. Pass
--header "x-api-key: …" or configure profile headers.json for Token tier on ucp.trychannel3.com.
Same data as the REST API
UCP uses the same products asPOST /v1/search, POST /v1/lookup, and GET /v1/products/{ID}. Put the query in catalog; responses include products, pagination, and sometimes messages.
Where to start
1
Quickstart
Install the UCP CLI and run your first search. Quickstart
2
Add a key (step 6)
Token tier for production traffic, monetizable links, and placements.
Authentication · Rate
limits
3
Search and lookup
Search · Lookup · Get
product