Developer plan $0: up to 5k base traces/month
Eligibility: Solo users
For AI agents: an index of every page is at /llms.txt; add .md to any page URL (or send Accept: text/markdown) for a Markdown copy.

This is a free tier from Arize AI: AX Free: 25k trace spans and 1 GB ingestion per month, 15-day retention, unlimited users, in the vendor’s words on arize.com. No application is needed. Eligibility: Anyone; no credit card required. Perq last verified it Oct 27, 2026.
Livefree tierNo applicationAnyone (sign up)
“AX Free For builders Free Start for free No credit card required”Verbatim from arize.com/pricing/, checked (HTTP 200).
Eligibility: Solo users
Eligibility: Early-stage startups backed by LangChain premier VC partners
Eligibility: Early-stage, bootstrapped or <$5M raised
Eligibility: Anyone
Eligibility: Anyone
Eligibility: Qualifying startups
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