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Maxio for AI agents

Maxio, formerly Chargify, is a subscription billing platform that manages products, pricing, invoices, and revenue for SaaS companies running usage-based plans. Connect it once through Arc0, and your agent, or Claude, ChatGPT and Cursor, can use it through one MCP endpoint, limited to what each user approved.

Connect MaxioSee the 177 actions ↓
Finance and accountingAPI keyMCP + RESTmaxio.com
AUDIT LOG · MAXIOPOLICY: acme-support
09:41:07 · claude · u_8f2read
maxio.list_events
List Events✓ allowed · 212ms
09:41:08 · claude · u_8f2read
maxio.get_mrr
Get MRR✓ allowed · 164ms
09:41:09 · claude · u_8f2write
maxio.create_usage
Create Usage✓ approved · approved by user
09:41:12 · claude · u_8f2destructive
maxio.delete_customer
Delete Customer✕ blocked · policy: deny
EVERY MAXIO CALL, ON THE RECORD
01 · USE CASES

What agents do in Maxio.

01

Look up a customer's subscription

Check a customer's current subscription and components before answering a billing question.

02

Apply a coupon to a subscription

Apply an approved discount coupon to a customer's active subscription once the promotion has been confirmed.

03

Approve before archiving a product

Require sign-off before archiving a product, since it affects new signups and pricing pages.

02 · ACTIONS

177 Maxio actions, graded by risk.

Every Maxio action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.

read

84

Look things up. Allowed by default.

  • maxio.get_mrr
    Get MRR
  • maxio.list_events
    List Events
  • maxio.list_offers
    List Offers
  • maxio.list_usages
    List Usages
  • maxio.list_invoices
    List Invoices
  • maxio.list_products
    List Products
  • maxio.list_webhooks
    List Webhooks
  • maxio.list_customers
    List Customers
  • maxio.list_endpoints
    List Webhook Endpoints
  • maxio.list_components
    List Components
  • maxio.list_metafields
    List Metafields
  • maxio.list_allocations
    List Allocations
  • maxio.list_prepayments
    List Prepayments
  • maxio.list_credit_notes
    List Credit Notes
  • maxio.list_reason_codes
    List Reason Codes
  • maxio.list_mrr_movements
    List MRR Movements
+ 68 MORE

write

69

Create and change things. Allow, or ask the user first.

  • maxio.create_usage
    Create Usage
  • maxio.send_invoice
    Send Invoice
  • maxio.update_coupon
    Update Coupon
  • maxio.create_invoice
    Create Invoice
  • maxio.create_product
    Create Product
  • maxio.update_product
    Update Product
  • maxio.create_customer
    Create Customer
  • maxio.create_endpoint
    Create Webhook Endpoint
  • maxio.create_metadata
    Create Metadata
  • maxio.update_customer
    Update Customer
  • maxio.update_endpoint
    Update Webhook Endpoint
  • maxio.create_component
    Create Component
  • maxio.update_component
    Update Component
  • maxio.create_metafields
    Create Metafields
  • maxio.create_prepayment
    Create Prepayment
  • maxio.create_reason_code
    Create Reason Code
+ 53 MORE

destructive

24

Delete, cancel or archive. Ask first, or deny outright.

  • maxio.archive_offer
    Archive Offer
  • maxio.archive_coupon
    Archive Coupon
  • maxio.archive_product
    Archive Product
  • maxio.delete_customer
    Delete Customer
  • maxio.archive_component
    Archive Component
  • maxio.delete_reason_code
    Delete Reason Code
  • maxio.delete_coupon_subcode
    Delete Coupon Subcode
  • maxio.delete_subscription_note
    Delete Subscription Note
  • maxio.delete_subscription_group
    Delete Subscription Group
  • maxio.archive_product_price_point
    Archive product price point
  • maxio.cancel_delayed_cancellation
    Cancel Delayed Cancellation
  • maxio.archive_component_price_point
    Archive Component Price Point
  • maxio.delete_unused_payment_profile
    Delete Unused Payment Profile
  • maxio.remove_subscription_from_group
    Remove Subscription from Group
  • maxio.delete_prepaid_usage_allocation
    Delete Prepaid Usage Allocation
  • maxio.remove_coupon_from_subscription
    Remove Coupon from Subscription
+ 8 MORE
03 · HOW IT WORKS

Maxio in three steps.

  1. 01Your users connect MaxioThey add their Maxio api key on Arc0 Connect, under your brand. It goes straight into the vault.
  2. 02You set the rulesReads run, writes like “create Usage” can wait for the user, and “delete Customer” can be denied outright.
  3. 03Any agent can actYour agent calls Maxio through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.
POLICY.TS
await arc0.policies.set('maxio', {
  read: 'allow',
  write: 'ask',        // create_usage
  destructive: 'deny',  // delete_customer
})

# Claude Code: the same connection, one URL
$ claude mcp add --transport http arc0 \
    https://mcp.arc0.ai/u/u_8f2
04 · AUTH AND DATA

How Maxio connects.

Users add their Maxio api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

The same Maxio connection serves your agent over MCP and your own backend over REST and the proxy, so a user connects once. How Arc0 handles credentials →

AUTH
API key
CREDENTIALS
Per-tenant encrypted vault
MODEL SEES
Results only, never credentials
AUDIT LOG
Every call, on every plan
05 · WORKS WITH

Use Maxio from any agent.

Claude
ChatGPT
Cursor
Codex
VS Code
OpenAI Agents SDK
Claude Agent SDK
Vercel AI SDK
Mastra
LangGraph
06 · RELATED

More finance and accounting apps.

Stripe433 actions44API4 actionsAirwallex7 actionsAiwyn Tax10 actionsAltoviz67 actionsCoupa384 actionsZoho Books265 actionsLongbridge161 actions
ALL FINANCE AND ACCOUNTING APPS →
07 · FAQ

Maxio and Arc0, answered.

Q01

Can I use Maxio with Claude, ChatGPT or Cursor?

Yes. Connect Maxio to Arc0 once, then add your Arc0 MCP URL to Claude, ChatGPT, Cursor, Claude Code or any other remote-MCP client. Each assistant only gets the Maxio actions you allow.

Q02

How do users connect Maxio?

Users add their Maxio api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

Q03

Which Maxio actions can my agent take?

177 in total: 84 read, 69 write and 24 destructive, such as “create Usage”. Your policies decide which of them each agent may call.

Q04

Can I stop my agent from deleting things in Maxio?

Yes. Actions like “delete Customer” are graded destructive. Set destructive actions to deny, or to ask so the user approves each one, and blocked calls still show up on the audit log.

Q05

Can my own backend call Maxio too?

Yes. The same Maxio connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.

Get started

Plug Maxio into your agent.

Your users connect Maxio once, under your brand. Your agent gets 177 actions behind your policies, with every call on the record.

Connect MaxioBrowse all apps →

Free to build · MCP + REST · Audit log on every plan