Billing infrastructure for developers

Build your product,
not billing infrastructure.

Meter every event you emit, price it across multiple dimensions, and settle it against a prepaid balance. Use our subscriptions API, ready-to-use Maxio hosted pages, or fully embedded solutions.

Get a demo Explore docs

Event stream

Live

Metered this cycle

2,898,342

events

Wallet balance

$7,657.50

of $10,000.00

Auto-refill at $1,000.00 ~9 days runway

POST /{subdomain}/events/{api_handle}

Trusted by 2,000+ SaaS, AI, and subscription businesses worldwide

Avoid the sharp edges of billing

Billing gets complicated fast. Usage pipelines, pricing logic, invoices, and reporting all create systems your team has to build, connect, and maintain. Let Maxio handle it all.

Ingest usage as it happens

Reliable real-time event ingestion, schema validation, and backfills within the current billing period.

Model pricing without rebuilding your product

Flexible metering and rating across usage dimensions, without forcing architecture changes when pricing changes.

Generate invoices and recognize revenue

Connect usage, rating, invoicing, reporting, and revenue recognition through one system.

Your integration doesn’t change when your pricing does

Plan changes, coupons, and new products live in the catalog, not your codebase. Finance and Ops can manage pricing and pull their own reports, so every change doesn’t become an engineering ticket.

Pricing catalog

GPT-4 1,082,934 events

1 – 500,000 $0.0075

500,001 – ∞ $0.0050

GPT-3.5 612,318 events

1 – ∞ $0.0015

Invoice preview

GPT-4 1,082,934 events

1 – 500,000 $3,750.00

500,001 – 1,082,934 $2,914.67

GPT-3.5 612,318 events

1 – 612,318 $918.48

Total $7,583.15

Entitlements

Access rules you don’t have to maintain

The system that knows what a customer bought should also know what they’re allowed to use. Maxio connects entitlements directly to billing and subscription data, so your product can resolve access rights, usage limits, and service levels without your team building a separate system and keeping it in sync.

Access updates automatically as plans and products change.
Entitlements stay in sync with billing, without separate mapping logic.
Usage limits from multiple products combine into a single entitlement instead of creating duplicate records.

Explore entitlements management

app.yourcompany.com/subscriptions/1042/entitlements

Subscription entitlements Pro plan + Extra capacity

FeatureKindResolved value

api_calls Usage limit 1,500 calls Pro plan 1,000 + Extra capacity 500

seats Usage limit 25 seats Pro plan

sso Access right Enabled Pro plan

support_tier Service right Priority Pro plan

Keep critical systems in sync

Keep billing data flowing across the systems you already use.

Get a demo All integrations

For developers

The endpoints billing actually needs

Integrate with many environments and programming languages via our REST API.

Explore docs

POST/subscriptions.json JSON

{
  "subscription": {
    "product_handle": "growth",
    "customer_attributes": {
      "first_name": "Jordan",
      "last_name": "Lee",
      "email": "jordan.lee@example.com"
    },
    "payment_collection_method": "automatic"
  }
}

View subscriptions API docs

POST/offers.json JSON

{
  "offer": {
    "name": "Growth Annual",
    "handle": "growth-annual",
    "product_id": 31,
    "product_price_point_id": 102,
    "components": [
      { "component_id": 144, "starting_quantity": 10 }
    ]
  }
}

View offers API docs

POST/subscriptions/2847/components/144/usages.json JSON

{
  "usage": {
    "quantity": 1000,
    "memo": "September API calls"
  }
}

View usage API docs

GET/portal/customers/150/management_link.json JSON

{
  "url": "https://billingportal.com/manage/150/1789142575/8f3c2a",
  "fetch_count": 1,
  "created_at": "2026-09-11T14:02:55-05:00",
  "new_link_available_at": "2026-09-11T14:07:55-05:00",
  "expires_at": "2026-10-11T14:02:55-05:00"
}

View billing portal API docs

GET/invoices.json?status=open JSON

{
  "invoices": [
    {
      "uid": "inv_8x4k2m9qvbt7",
      "number": "1042",
      "status": "open",
      "issue_date": "2026-09-01",
      "due_date": "2026-10-01",
      "total_amount": "97.00"
    }
  ]
}

View invoices API docs

POST/endpoints.json JSON

{
  "endpoint": {
    "url": "https://api.yourcompany.com/hooks",
    "webhook_subscriptions": [
      "payment_failure",
      "subscription_state_change",
      "invoice_issued",
      "renewal_success"
    ]
  }
}

View webhook endpoint docs

Official SDKs

Explore docs

Maxio hosted

Skip the build. Get to billing.

Prebuilt pages your customers can use on day one. No front end to design, no coding required.

With Maxio’s billing portal, your subscribers can review invoices, update payment methods, or upgrade their plans with ease. You maintain control, deciding which actions your customers can take, providing a customizable experience that fits your business needs.

Configure signup pages with automatic or remittance billing, specify a subscription billing cycle, enable coupons, create custom fields, and more.

Create almost any billing scenario in minutes. Define plans, create products (such as add-ons or usage), and enable coupons. Quickly create customizable offers without cluttering your catalog.

Get a demo

customer.billingportal.com

Update your billing info

This account has an overdue balance of $128.00. We will attempt to collect this amount when your billing information is updated.

Payment method

Visa ending in 4242 Expires 09/29

Recent invoices

InvoiceDateAmountStatus

INV-1042 Aug 1, 2026 $128.00 Open

INV-1031 Jul 1, 2026 $128.00 Paid

signup.yourapp.com/plans/pro

Pro plan $49/month

Your details

Name

Jane Cooper

jane@example.com

Referral code optional

Payment

Visa Mastercard Amex Discover

Card details

•••• •••• •••• 4242

app.yourcompany.com/catalog

Plan family Pro Plans

Starter

$19/mo

Pro

$49/mo

Products

ProductKindDefault price point

API access On/off Active

Seats Quantity-based Active

API calls Metered Active

Support tickets Event-based Active

Data storage Prepaid usage Archived

Embedded solutions

Billing that lives inside your product

Offer a customized billing experience without starting from scratch. These tools help you get started quickly at any level of customization.

Include prebuilt subscription management options, billing history, and payment details inside your application so customers can self-service without ever leaving your product.

JavaScript

let componentsFactory = new Components({
  accessTokenUrl: 'https://merchant.site/components/auth',
  i18nSettings: {
    loadPath: 'https://your-host.example.com/locales/en/{{ns}}.json',
    language: 'en',
  },
  theme: {
    colors: brandColors,
  },
});

View component docs

Stream events as JSON and price them on any combination of attributes: model, region, token type, or your own.

POST/acme/events/model_inference JSON

{
  "maxio": {
    "subscription_id": 2847
  },
  "model": "gpt-4",
  "input_tokens": 18400,
  "output_tokens": 2130,
  "region": "us-east-1"
}

Explore event ingestion docs

Maxio.js can be used to easily embed signup and payment experiences within your application.

JavaScript

const maxio = new Maxio();

maxio.load({
  publicKey: maxioPublicKey,
  serverHost: maxioSiteUrl,
  type: 'card',
  fields: {
    number: { selector: '#cc_number' },
    cvv: { selector: '#cc_cvv' },
  },
});

maxio.token(form, (token) => sendToYourServer(token));

View Maxio.js docs

app.yourcompany.com/settings/billing

Settings Billing

Pro $49.00/mo Next BillingOct 1, 2026 Active

Plan Details Change Plan Apply Coupon Cancel

Subscription StartedJan 12, 2026

Estimated Next Billing Amount$49.00

Add-ons Configure Add-ons

Seats12 seats

Projects25 projects

Billing Details Update Payment Method

Visa •••• 4242 Expires 09/2029

app.yourcompany.com/metering/streams/model_inference

Event stream Model inference Active

API Handle

model_inference Copy stream URL

Events This Month

2,847,193

Recent events

EventModelAttributesTokens

inference.completed GPT-4 long_contextvision 2,840

tokens.embedded text-embedding-3 batch_processingcached 12,500

inference.completed GPT-3.5 streaminghigh_priority 5,600

inference.completed GPT-4-Vision visioncached 4,100

Usage and pricing by model

ModelEventsPrice

GPT-41,082,934

1 – 500,000$0.0075

500,001 – ∞$0.0050

text-embedding-3968,044

1 – 1,000,000$0.0004

1,000,001 – ∞$0.0002

GPT-3.5612,318

1 – ∞$0.0015

GPT-4-Vision183,897

1 – ∞$0.0100

Total this month 2,847,193

app.yourcompany.com/checkout

Yourcompany Checkout

Order summary

ProBilled monthly $49.00/mo

Seats12 × $4.00 $48.00/mo

Due today $97.00

jordan.lee@example.com

Card Details

First Name on Card *

Jordan

Last Name on Card *

Lee

Card Number *

4242 4242 4242 4242

CVV

•••

Expiration Month *

Expiration Year *

2029

Billing Details

Billing Country

United States

Billing Zip

94105

Place My Order

Billing infrastructure for developers

Avoid the sharp edges of billing

Ingest usage as it happens

Model pricing without rebuilding your product

Generate invoices and recognize revenue

Your integration doesn’t change when your pricing does

Access rules you don’t have to maintain

Keep critical systems in sync

The endpoints billing actually needs

Skip the build. Get to billing.

Billing that lives inside your product

Secure and reliable billing software

Built and supported by engineers

Billing infrastructure for developers

Avoid the sharp edges of billing

Ingest usage as it happens

Model pricing without rebuilding your product

Generate invoices and recognize revenue

Your integration doesn’t change when your pricing does

Access rules you don’t have to maintain

Keep critical systems in sync

The endpoints billing actually needs

Skip the build. Get to billing.

Billing portal

Signup pages

Catalog

Billing that lives inside your product

Secure and reliable billing software

Built and supported by engineers