---
title: "Console: choose Free on the plan step."
method: POST
path: "/billing/plan"
tags: ["billing"]
---

# Console: choose Free on the plan step.

`POST /billing/plan`

## Request

- Base URL: `https://api.agentisend.com`
- URL: `https://api.agentisend.com/billing/plan`
- Auth: HTTP bearer

Paid plans go through POST /billing/checkout. Idempotent; owner only.

## Headers

- `Idempotency-Key` string
- `Resend-Idempotency-Key` string

## Request body

- PostBillingPlanBody
  - `tier` 'free', required

## Response `201`

Success

- GetBillingPlanReply
  - `tier` 'free' | 'starter' | 'pro' | 'scale', required
  - `plan_status` 'none' | 'trialing' | 'active' | 'past_due' | 'canceled', required
  - `needs_plan_selection` boolean, required
  - `plan_source` 'free' | 'subscription' | 'manual' | 'lifetime', required
  - `billing_term` 'month' | 'year', nullable, required
  - `entitlements` object, required
    - `tier` 'free' | 'starter' | 'pro' | 'scale', required
    - `included_emails_per_month` integer, required
    - `retention_days` integer, required
    - `max_domains` integer, nullable, required
    - `max_seats` integer, required
    - `overage_minor_per_1000_emails` integer, nullable, required
  - `subscription` object, nullable, required
    - `status` string, required
    - `price_lookup_key` string, nullable, required
    - `current_period_end` string, date-time, nullable, required
    - `cancel_at_period_end` boolean, required
  - `billing_configured` boolean, required
  - `terms_on_sale` string[], required
  - `plans` object[], required
    - `tier` 'starter' | 'pro' | 'scale', required
    - `name` string, required
    - `featured` boolean, required
    - `included_emails_per_month` integer, required
    - `max_domains` integer, nullable, required
    - `max_seats` integer, required
    - `retention_days` integer, required
    - `prices` object, required
      - `month` object, required
        - `per_month_minor` integer, required
        - `total_minor` integer, required
        - `months` integer, required
        - `discount_percent` integer, required
      - `year` object, required
        - `per_month_minor` integer, required
        - `total_minor` integer, required
        - `months` integer, required
        - `discount_percent` integer, required
    - `volume_rungs` object[], required
      - `included_emails_per_month` integer, required
      - `monthly_price_minor` integer, required
      - `prices` object, required
        - `month` object, required
          - `per_month_minor` integer, required
          - `total_minor` integer, required
          - `months` integer, required
          - `discount_percent` integer, required
        - `year` object, required
          - `per_month_minor` integer, required
          - `total_minor` integer, required
          - `months` integer, required
          - `discount_percent` integer, required
  - `lifetime` object, nullable, required
    - `tier` 'tier1' | 'tier2' | 'tier3' | 'tier4', required
    - `name` string, required
    - `emails_total` integer, required
    - `emails_used` integer, required
    - `emails_left` integer, required
    - `max_emails_per_month` integer, required
    - `refundable` boolean, required
  - `lifetime_on_sale` boolean, required
  - `lifetime_plans` object[], required
    - `tier` 'tier1' | 'tier2' | 'tier3' | 'tier4', required
    - `name` string, required
    - `featured` boolean, required
    - `price_minor` integer, required
    - `emails_total` integer, required
    - `max_emails_per_month` integer, required
    - `features_of` 'starter' | 'pro' | 'scale', required
    - `max_domains` integer, nullable, required
    - `max_seats` integer, required
    - `retention_days` integer, required
    - `price_now_minor` integer, nullable, required
  - `lifetime_refund_rule` string, required
  - `viewer` object, required
    - `role` 'owner' | 'admin' | 'viewer', nullable, required
    - `can_purchase` boolean, required
    - `can_purchase_lifetime` boolean, required
  - `purchasable` object[], required
    - `tier` 'starter' | 'pro' | 'scale', required
    - `monthly_price_minor` integer, required
    - `included_emails_per_month` integer, required

## Other responses

- `400`: The request is malformed or a field failed validation. Codes: validation_error, invalid_idempotency_key, invalid_cursor, plan_not_purchasable, stripe_signature_invalid, support_upload_rejected, sign_in_check_required.
- `401`: No usable credential was sent. Codes: missing_api_key, session_required, mfa_required.
- `403`: The credential may not do this, or the account or key is stopped. Codes: sending_domain_blocked, young_domain_held, domain_sending_disabled, domain_not_verified, onboarding_recipient_not_a_member, onboarding_sender_unavailable, account_suspended, account_sandboxed, human_action_required, csrf_origin_rejected, charge_not_this_account, invalid_api_key, restricted_api_key, insufficient_role, invite_email_mismatch, domain_scope_violation, dedicated_ip_assigned_by_us, approval_required, staff_review_required, trust_paused, kill_switch_active.
- `404`: Nothing with this id exists on the account. Codes: billing_customer_missing, not_found, session_expired, support_ticket_not_found.
- `409`: The request conflicts with the current state. Codes: domain_already_exists, template_name_taken, template_alias_taken, template_in_use, segment_in_use, contact_resubscribe_required, email_still_scheduled, domain_verified_elsewhere, domain_not_claimable, return_path_subdomain_in_use, overage_not_on_plan, term_not_on_sale, subscription_active, portal_change_unavailable, already_in_account, idempotency_in_flight, idempotency_payload_mismatch, approval_expired, support_closed, support_reopen_expired, support_merge_conflict, support_reply_too_soon.
- `413`: The request body is larger than this operation accepts. Codes: payload_too_large, support_upload_too_large.
- `415`: The request body is not JSON. Codes: unsupported_media_type.
- `429`: A rate, quota or ramp ceiling was reached. Codes: onboarding_daily_cap_reached, trust_throttled, invite_limit_reached, rate_ceiling_exceeded, daily_quota_exceeded, monthly_quota_exceeded, rate_limit_exceeded, support_rate_limited.
- `500`: Something failed on our side. Codes: internal_server_error.

---

[API](https://skmtc.dev/agentisend/apis/agentisend-api.md) · [All operations](https://skmtc.dev/agentisend/apis/agentisend-api/llms.txt) · [OpenAPI document](https://skmtc.dev/agentisend/apis/agentisend-api/revisions/3066dda62a56?raw)