specification: API Commons Plans
specificationVersion: '0.1'
schema: https://raw.githubusercontent.com/api-evangelist/interface-research/main/schema/api-commons.yml#/$defs/Plans
provider: HaneruTo
providerId: hakuto-0209-com
generated: '2026-09-19'
method: searched
created: '2026-09-19'
modified: '2026-09-19'
tags:
- Agents
- MCP
- A2A
- Code Review
description: >-
  b612's agent access has two published tiers and one published price of null: a free keyless tier limited
  to the principles and rules skills at 20 requests/min per IP, and a paid licence sold as "a monthly flat
  fee with a call cap" whose amount "depends on your volume — please contact us". The data policy adds that
  individual and contract developers "can use the existing monthly licence as-is" for agent access, i.e. the
  same b612 licence key covers the Claude Code / Codex integration and the A2A/MCP surface. The company's
  特定商取引法 disclosure page publishes prices for its development service (hakuto AI: ¥100,000/month +
  ¥300,000 initial, ¥50,000 per additional PC, all tax-inclusive, Stripe or bank transfer) but does NOT
  price b612 or the agent surface; those figures are recorded in a note, not as API plans.
sources:
- https://mcp.hakuto-0209.com/.well-known/agent-card.json
- https://mcp.hakuto-0209.com/terms
- https://hakuto-0209.com/legal/hakuto-company.html
plan_count: 2
plans:
- id: b612-free-keyless
  name: Free (keyless) — principles and rules
  type: free
  price: 0
  currency: JPY
  billing_period: none
  description: No licence key required. Limited to the principles and rules skills / tools.
  entries:
  - label: Requests per minute per IP
    name: rpm_per_ip
    type: rate
    metric: requests
    limit: 20
    timeFrame: minute
  source: https://mcp.hakuto-0209.com/.well-known/agent-card.json
  quote: 'Free to try: principles and rules need no key (20 req/min per IP).'
- id: b612-agent-licence
  name: Agent-to-agent licence (monthly flat fee with call cap)
  type: subscription
  price: null
  currency: JPY
  billing_period: month
  description: >-
    All skills/tools with an x-b612-key. Priced on contact; the call cap scales with volume. Trials exist
    and stop automatically with no charge (terms §9); monthly plans can be cancelled at any time with no
    cancellation fee (company page).
  entries:
  - label: Monthly call cap
    name: call_cap
    type: quota
    metric: calls
    limit: null
    timeFrame: month
    note: Cap set per contract by volume; not published.
  source: https://mcp.hakuto-0209.com/terms
  quote: 'Agent-to-agent access is priced as a monthly flat fee with a call cap. The cap depends on your volume — please contact us below.'
  contact: https://hakuto-0209.com/#contact
note: >-
  Development-service pricing published at https://hakuto-0209.com/legal/hakuto-company.html (hakuto AI:
  ¥100,000/month tax-inclusive + ¥300,000 initial fee; ¥50,000 per additional PC; one-off delivery by
  quote; consultation and mock-up free) is the price of the consulting product, not of API or agent access,
  and is deliberately not recorded as a plan.
x-canonical:
  generated: '2026-10-08'
  vocabulary: all/0-working/economics/plans-canonical.yml
  models:
  - free
  - subscription
  units:
  - request
  plans:
  - name: Free (keyless) — principles and rules
    access: free
    model: free
    model_how: derived
    units:
    - request
    periods:
    - minute
  - name: Agent-to-agent licence (monthly flat fee with call cap)
    access: other
    model: subscription
    model_how: stated
    units:
    - request
    periods:
    - month