Billsby
EcosystemSubscription billing platform for SaaS businesses with a focus on easy setup, plan management, and self-service customer portals for subscription lifecycle management.
Billsby is an official UCP ecosystem participant.
Billsby is a subscription billing platform designed for SaaS and digital product businesses. It emphasizes fast setup, with a no-code plan builder and hosted customer portal for subscriber self-service. Billsby handles recurring billing, invoicing, trial management, and dunning. It also provides a feature flag system tied to subscription plans, so product features can be unlocked or locked based on the subscriber's current plan.
The customer portal is the UCP-relevant capability. Billsby's hosted portal lets subscribers manage their own plans, payment methods, and billing details without logging into the main application. For an AI agent acting on behalf of a consumer, the portal's underlying API provides the same programmatic access that a human would use through the UI.
Billsby has not announced UCP integration. Its API covers subscription creation, modification, cancellation, and billing history. The platform is aimed at smaller SaaS businesses that need subscription billing without enterprise complexity, making it a lightweight option for developers building agent-facing subscription commerce at that scale.
Why This Matters for UCP
Billsby provides lightweight subscription billing for SaaS businesses, with a customer portal and REST API that give agents programmatic access to plan management and billing lifecycle operations.
UCP Capabilities
UCP Endpoint
Ecosystem — Endpoint not yet publicly available
Integration Example
// Billsby API for SaaS subscription management.
// Agents interact with subscriptions via REST to manage plan state.
// Get all subscriptions for a customer
const customer = await fetch(
'https://public.billsby.com/api/v1/customers/' + customerId + '/subscriptions',
{ headers: { apikey: process.env.BILLSBY_API_KEY } }
).then(r => r.json());
// Change subscription plan
await fetch(
'https://public.billsby.com/api/v1/subscriptions/' + subscriptionId + '/plan',
{
method: 'PUT',
headers: {
apikey: process.env.BILLSBY_API_KEY,
'Content-Type': 'application/json',
},
body: JSON.stringify({ planId: targetPlanId, cycleId: cycleId }),
}
);Category
PlatformsUCP Status
EcosystemTags
Pricing
paid
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Reviews
★★★★☆4.3 (3 reviews)These are illustrative examples to show what reviews will look like. Submit your own experience below.
S. Nakamura
Senior Developer · Mar 1, 2026
Good UCP support. Endpoint is stable and well-documented. The only minor friction was rate limits during initial testing — easy to request an increase.
P. Rodriguez
Commerce Engineer · Jan 22, 2026
The UCP capabilities are complete and work as advertised. Our shopping agent handles product discovery and checkout end-to-end through this platform.
L. Wang
API Developer · Feb 14, 2026
Reliable endpoint. We run automated conformance checks weekly and they pass consistently. The identity linking spec is fully implemented.
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