Chargify (Maxio) B2B Subscription Billing API
Chargify (now Maxio) REST API for B2B subscription billing and revenue management platform. Enables AI agents to manage subscription lifecycle including creation, upgrades, downgrades, and cancellations, handle recurring billing and invoice generation automation, access MRR, ARR, and churn metric retrieval for revenue analytics, retrieve dunning management and failed payment recovery workflows, manage proration calculation and mid-cycle billing adjustments, handle component-based billing for usage-based pricing models, access coupon and discount management for customer retention, retrieve customer and subscription health scoring data, manage metered billing and usage-based charge processing, and integrate billing data with Salesforce, QuickBooks, NetSuite, and revenue recognition platforms.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Subscription billing. PCI-DSS L1, SOC2, GDPR. API key. US. Subscription and payment data.
⚡ Reliability
Best When
A B2B SaaS company using Chargify/Maxio wants AI agents to automate subscription management, dunning, MRR tracking, usage-based billing, and revenue analytics integration.
Avoid When
FINANCIAL RISK: Subscription modifications (upgrades, downgrades, cancellations) are immediate and affect customer billing — implement approval workflows for automated subscription changes. Proration calculations can be complex; validate results before applying credits. Dunning automation without appropriate retry logic and customer notification can damage customer relationships.
Use Cases
- • Managing subscription lifecycle from billing automation agents
- • Tracking MRR and churn from revenue analytics agents
- • Processing dunning and payment recovery from finance automation agents
- • Handling usage-based billing from product-led growth agents
Not For
- • B2C and consumer subscription billing without B2B invoice and contract focus
- • Simple one-time payment processing without recurring billing complexity
- • Enterprise CPQ without product-led growth and self-service billing needs
Interface
Authentication
Chargify/Maxio uses API key authentication with HTTP Basic auth (API key as username, password 'x'). Per-subdomain API configuration (each Chargify site has own subdomain). Open-source SDKs on GitHub (maxio-com). Webhooks for subscription lifecycle events. REST API at developer.chargify.com. Chargify rebranded as Maxio (2022) after merger with SaaSOptics. Site-specific API endpoints.
Pricing
Scottsdale, Arizona. Founded 2009. Private (merged with SaaSOptics 2021, rebranded Maxio 2022). B2B subscription billing market. 2,000+ SaaS customers. Strong in B2B SaaS mid-market. Chargify brand well-known in developer community. Maxio brand for combined billing + revenue operations platform. Competes with Chargebee and Recurly for B2B subscription billing.
Agent Metadata
Known Gotchas
- ⚠ FINANCIAL RISK: Subscription modifications are immediate; implement approval workflow for automated subscription changes; proration credits are immediate billing impacts
- ⚠ Site-specific subdomains — each Chargify site has own API subdomain (yoursite.chargify.com); multi-site architectures require per-site API key management
- ⚠ HTTP Basic auth pattern — API key used as HTTP Basic auth username with 'x' as password; non-standard auth pattern; implement correctly or requests fail silently
- ⚠ Maxio rebrand — Chargify rebranded as Maxio (2022); developer.chargify.com still active but Maxio branding in product; verify current documentation endpoint
- ⚠ Webhook signature validation — validate webhook signatures before processing; unauthorized webhooks can trigger fraudulent subscription changes
- ⚠ Dunning smart retry — Maxio has configurable dunning retry logic; don't override with custom retry automation unless understanding default dunning behavior first
Alternatives
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Scores are editorial opinions as of 2026-03-07.