AuthPI has one plan. There’s no tier that gates core identity primitives behind an upgrade. Every account gets the same authentication methods, MFA, organizations, webhooks, and API access from day one. What scales with your usage is the bill, computed from a small number of understandable dimensions: metered identity activity, infrastructure capacity, and a flat platform fee.

The three components

1. Metered identity activity

Four dimensions, each with its own per-operation rate:

Dimension	What it covers	Rate
Human authentication	Successful sign-ins (one per issued session; MFA steps do not add counts)	$0.50 per 10,000 operations
Machine authentication	Agent and service-credential authentication	$0.50 per 10,000 operations
API key verification	Each successful API key check	$0.20 per 10,000 operations
Identity lifecycle	Signups, invitations, membership changes	Free (currently rated $0)

A $1/month usage credit is applied automatically before any activity charge. Small and moderate accounts often owe nothing here at all. Unused credit doesn’t roll over.

What does NOT count as activity: reads, config changes (creating or updating issuers, clients, webhooks, auth methods, etc.), webhook deliveries and retries, audit-record fan-out, and failed operations. None of these multiply your bill. Only the four dimensions above are metered.

2. Infrastructure capacity

Billed for keeping a resource live, prorated by the day, not for the write that created it. Creating, updating, or deleting an issuer or a domain is always free; what’s billed is having one.

Resource	Included	Rate beyond included
Issuers	2	$2/month each
Custom domains	0	$5/month each

3. Platform fee

A flat $5/month, independent of usage.

The trial

Every account gets a 60-day trial from creation. During the trial:

• Metered activity (all four dimensions above) is waived
• The platform fee is waived
• Capacity is not waived: issuers beyond the included 2 and any custom domains still bill during the trial, since that reflects real standing infrastructure cost rather than usage

Platform and metered-activity charges begin with the first UTC billing month starting on or after the trial ends. If the trial ends partway through a month, those charges are waived for that entire month. Additional capacity charges apply throughout. There is no permanent free tier or feature-tier change when the trial ends.

Statements and payment

Statements are finalized after each UTC calendar month. Payments are handled through Stripe: an enabled, usable saved payment method is charged automatically; otherwise, payment can be requested by email invoice with 30 days to pay.

No card does not mean no charges. Standard charges accrue after the trial even without a saved card. The account does not automatically pause or move to a free tier. Extra issuers and custom domains also remain billable during the trial. Not adding a card does not extend the trial or waive amounts owed.

Worked example

An account with 50,000 human logins, 10,000 machine logins, and 20,000 API key verifications in a month, running 3 issuers (1 beyond the included 2) and 1 custom domain:

Human authentication      50,000 × $0.00005   =  $2.50
Machine authentication    10,000 × $0.00005   =  $0.50
API key verification      20,000 × $0.00002   =  $0.40
Identity lifecycle        (any count)          =  $0.00
                                                 ────────
Metered subtotal                                 $3.40
Usage credit                                    −$1.00
                                                 ────────
Net activity                                     $2.40

1 extra issuer             1 × $2                $2.00
1 custom domain            1 × $5                $5.00
                                                 ────────
Capacity                                         $7.00

Platform fee                                     $5.00
                                                 ════════
Total                                           $14.40/month

During the trial, the same account would owe only the $7.00 capacity charge. Activity and the platform fee drop out.

Rate versioning

Every statement records the config_version that rated it. If rates change in the future, past statements are never rewritten. You can always see which rate card applied to any historical period from your account’s ledger.

Reading your usage

Billing posture and running balance are inline on the account object (GET /v1/accounts/:account_id); the full ledger, including past statement lines, is available from GET /v1/accounts/:account_id/credits/ledger. See the Core API Reference for the full schema.

Related reading

• Issuers: the resource that anchors capacity billing
• Core API Reference: full schema for accounts, credits, and ledger endpoints