# baipiaoji.com — AI agents — 2 of 5

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> Probe-verified (tier 2 of 3). Last checked 2026-09-26. 2 of 5 capability checks passed. 2 unknown.

- host: baipiaoji.com
- url: https://baipiaoji.com/
- category: AI agents
- type: business
- country: CN
- language: zh-CN

## Probe-verified · tier 2 of 3

Probed live on 2026-09-26 against rubric v1.2. 2 of 5 checks passed. 2 unknown.

- UNKNOWN — Markdown negotiation (`Accept: text/markdown`)
- UNKNOWN — Markdown twin at a predictable URL (`/page.md`)
- PASS — llms.txt (`/llms.txt`)
- FAIL — API catalog (`RFC 9727`)
- PASS — MCP endpoint answers tools/list (`initialize → tools/list, no credentials`) · on 26 Sep 2026
  - ABSENT — MCP server card (`/.well-known/mcp/server-card.json`): absent; not scored
  - Platform-supplied: no; not scored
- FAIL — Other agent files at well-known paths (`agent-skills/index.json · oauth-authorization-server · oauth-protected-resource · http-message-signatures-directory`): none found; not scored

MCP tools (from tools/list on 2026-09-26): search_ai_tools, get_free_tier_limit, compare_free_tiers, check_free_tier_claim, build_free_workflow, get_free_tier_changes, check_api_quota_fit, find_free_alternatives, get_china_ai_rules, explain_missing_figure, audit_ai_stack, get_category_playbook, check_commercial_use, watch_free_tier_changes, monitor_new_agents, get_agent

## Summary

Chinese and English bilingual directory listing 221 AI tools with verified free tiers, including 62 fully free and 33 with daily free credits, plus 26 zero-cost AI usage plans and 6 zero-cost AI money-making playbooks detailing steps, failure reasons, and scams.

## Context

1528 sites in this index share the category "AI agents"; 262 are transactional.

## How we grade

- tier 1 — **Declared**: The site says agents are welcome in its robots.txt. A permission, not a capability.
- tier 2 — **Probe-verified** (this site): We fetched the site and tested each signal ourselves. Dated, repeatable, re-checked on a schedule.
- tier 3 — **Behaviourally verified**: An agent completed the action end to end — booked, bought, submitted — and it worked.

## About this record

Known Good probes sites live and publishes what was tested and when.
Method: https://knowngood.sh/about.md · Rubric: https://knowngood.sh/benchmark

How we found this site: probe discovery. This site didn't declare agent access — we found it by checking the open web. Everything above was tested the same way, against the same rubric, on the date shown. [How we choose what to check, and how to opt out](https://knowngood.sh/bot)

## Where this sits

- CN: https://knowngood.sh/country/CN
- business: https://knowngood.sh/type/business
- AI agents: https://knowngood.sh/category/ai-agents
- Browse: https://knowngood.sh/browse
- Rubric: https://knowngood.sh/benchmark