Kill Bill

Best for: Prototypes and side projects - free to start, no sales call; Teams needing broad API coverage out of the box; Cost-sensitive teams - low, transparent entry price

Avoid if: You have strict compliance requirements

Pricing model

Subscription [2]killbill.io/pricing“Flat annual fees, never tied to your revenue. No percentage of revenue, no per-transaction charges, no surprises as you scale.”killbill.io/aviate“Never pay a percentage of your revenue.”

Published pricing

✓ Yes [3]killbill.io/pricing“At $25M ARR: Kill Bill (Aviate software + Growth Support) representative package costs $50k–$75k annually versus competitors charging ~$175k”killbill.io/pricing“Self-Hosted Open Source: Free. AWS Marketplace: ~$40/month plus AWS infrastructure costs.”

Free tier

✓ Yes [4]killbill.io/about-open-source-software“No monthly charges. No yearly charges. No per-transaction fees. No hidden charges.”killbill.io/pricing“100% open-source. Your data, your cloud, your compliance.”

Free tier details

100% open-source under Apache 2.0 license. Self-host for free with no monthly charges, no yearly charges, no per-transaction fees, no hidden charges. [5]killbill.io/faqs“Completely free to download, study, modify, and share”killbill.io/about-open-source-software“Kill Bill uses the Apache Version 2.0 license... Install it on your computer, server, or cloud and use it to bill customers and/or receive payments from them.”

Self-serve signup

✓ Yes [6]killbill.io/about-open-source-software“Install it on your computer, server, or cloud and use it to bill customers and/or receive payments from them.”

Requires sales call

✗ No [7]killbill.io/pricing“For exact Aviate and support pricing, contacting the team is required. The open-source tier is self-serve with no sales call needed.”

Enterprise plan

✓ Yes [8]killbill.io/pricing“Enterprise Support: 48-hour SLA for critical issues, priority access, unlimited access”killbill.io/aviate“Aviate is a premium billing platform built on Kill Bill”

• Usage-based billing
• Dunning / recovery
• Revenue recognition
• Tax / VAT handling
• Entitlements

Supported actions

create_subscription, modify_subscription, cancel_subscription, usage_metering, tiered_pricing, proration, invoicing, dunning, revenue_recognition, tax_calculation, entitlements, coupons, trials, webhooks, multicurrency, payment_retry, refunds, prepaid_wallet, custom_invoice_sequencing, multi_tenancy, audit_logging, rbac, catalog_management, plan_alignment, account_management, custom_fields, tags, payment_method_management, quotes_orders [9]killbill.io/aviate“Dynamic Catalog Management... Metering & Usage Billing... Wallet & Prepaid Credits... Coupons & Discounts... Tax Computation... Custom Invoice Sequencing... Revenue recognition”docs.killbill.io/latest/features“Real time billing and payment... Multi-phase plans supporting trial periods, discounts... Pro-ration logic automatically adjusts invoices during plan changes... Dunning can be configured to define the actions the system should take”

Regions

Global (self-hosted, any region), AWS Marketplace

Input types

subscription objects, usage events, payment methods, catalog definitions (XML/API), customer accounts, invoice line items, metered events, coupons, tax rules

Output types

JSON (REST API), invoices, webhook events (JSON), payment receipts, audit logs, revenue reports, Swagger/OpenAPI spec

Webhooks

✓ Yes [10]docs.killbill.io/latest/push_notifications“One can register a callback, i.e, a valid URL that will be called whenever there is an event dispatched for a tenant. If a non-2xx response code is returned, notifications will be retried at a later time”

Sandbox / test mode

✓ Yes [11]killbill.io/faqs“Free self-directed sandbox available at the Enterprise Sandbox for testing”

SDK languages

Java, Ruby, Python, PHP, Node.js [12]apidocs.killbill.io“Official client libraries available for: Java, Python, Ruby, PHP, JavaScript, Go (community-supported), .NET (community-supported)”docs.killbill.io/latest/features“Multiple client libraries (Java, Ruby, PHP, Python, Node.js)”

MCP server

✗ No [13]killbill.io

SOC 2

– Unknown [14]killbill.io/faqs

HIPAA

– Unknown [15]killbill.io/faqs

GDPR

✗ No [16]killbill.io/faqs“By default, Kill Bill avoids storing any PII information. However, it is your responsibility to ensure that you remain GDPR compliant.”killbill.io/platform/tax-compliance“Kill Bill provides the technical controls needed for GDPR compliance: data access APIs, self-hosting for data residency, RBAC for access control, and audit logs for accountability. Your organization applies these controls according to your specific compliance requirements.”

ISO 27001

– Unknown

PCI DSS

✗ No [17]killbill.io/faqs“it is your responsibility to get certified. Depending on how you plan to use Kill Bill, you can outsource most of the PCI complexity to your payment gateway by not storing credit card information.”

Published SLA

✓ Yes [18]killbill.io/pricing“Enterprise Support: 48-hour SLA for critical issues”

Known restrictions

Open-source self-host is free but requires own infrastructure; vendor does not provide managed hosting on all tiers, PCI DSS certification is user's own responsibility - Kill Bill provides technical building blocks but is not itself certified, SOC 2 certification is the deploying organization's responsibility; Kill Bill provides supporting technical controls only, GDPR compliance is the user's own responsibility; Kill Bill avoids storing PII by default but does not guarantee compliance for the operator, Aviate enterprise tiers require sales contact for specific pricing - published example only ($50k–$75k/year at $25M ARR for software + Growth Support), Tax calculation via Avalara AvaTax or Vertex integration - no native tax engine [19]killbill.io/platform/tax-compliance“Kill Bill partners with Avalara's AvaTax for tax calculations rather than handling this natively.”killbill.io/faqs“it is your responsibility to get certified. Depending on how you plan to use Kill Bill, you can outsource most of the PCI complexity to your payment gateway by not storing credit card information.”

• Docs
• API reference

Docs rendering: static

API style

rest

Base URL

http://127.0.0.1:8080/1.0/kb

Version

1.0

Versioning

url

Stability

ga

Auth methods

basic, api_key

Idempotency keys

✓ Yes

Error format

vendor-specific

SDKs

• Java org.kill-bill.billing:killbill-client-java · repo
• Ruby killbill-client · repo
• Python killbill · repo
• PHP killbill/killbill-client · repo
• Node.js killbill · repo

• Auth docs
• Quickstart
• Webhook events

Launched

2010-01-01

Notable customers

Groupon, CARFAX, Rocket Lawyer, HP, Rakuten

• Chargebee

  "Billing & Monetization for SaaS and AI Companies."

  Hybrid · free tier · public pricing · self-serve

• Maxio

  "Power your AI business with the billing, rev rec, and reporting engine that's as smart and scalable as your next breakthrough."

  Subscription · free tier · public pricing · self-serve

• Recurly

  "Subscription Management Software & Recurring Billing Platform"

  Hybrid · public pricing · self-serve

• Stigg

  "Monetization Control Layer for AI Products"

  Hybrid · free tier · public pricing · self-serve

• Lago

  "Lago is an open-source software for metering and usage-based billing. It's the best alternative to Chargebee, Recurly or Stripe Billing for companies that need to handle complex billing logic."

  Sales-led · free tier · public pricing · self-serve

• Stripe

  Financial infrastructure to grow your revenue.

  Usage · public pricing · self-serve

Kill Bill alternatives · Kill Bill vs Chargebee · All Subscription & Billing APIs APIs

Each field above carries a numbered source - hover for a preview, click to jump here.

1. ↑Description: killbill.io
2. ↑Pricing model: killbill.io · killbill.io
3. ↑Published pricing: killbill.io · killbill.io
4. ↑Free tier: killbill.io · killbill.io
5. ↑Free tier details: killbill.io · killbill.io
6. ↑Self-serve signup: killbill.io
7. ↑Requires sales call: killbill.io
8. ↑Enterprise plan: killbill.io · killbill.io
9. ↑Supported actions: killbill.io · docs.killbill.io
10. ↑Webhooks: docs.killbill.io
11. ↑Sandbox: killbill.io
12. ↑SDK languages: apidocs.killbill.io · docs.killbill.io
13. ↑MCP server: killbill.io
14. ↑SOC 2: killbill.io
15. ↑HIPAA: killbill.io
16. ↑GDPR: killbill.io · killbill.io
17. ↑PCI DSS: killbill.io
18. ↑Published SLA: killbill.io
19. ↑Known restrictions: killbill.io · killbill.io

Every field change, who made it, and when - from our audited data pipeline and editors.

1. 2026-06-21 Capabilities: {} → {"dunning":true,"usage_based":true,"entitlements":true,"tax_compliant":true,"re…
2. 2026-06-21 Summary Md: (none) → Kill Bill is an open-source billing and payments infrastructure platform, avail…
3. 2026-06-21 Score Setup Speed: (none) → 100
4. 2026-06-21 Score Docs Quality: (none) → 35
5. 2026-06-21 Score Procurement Friction: (none) → 100
6. 2026-06-21 Score Trust Readiness: (none) → 20
7. 2026-06-21 Best For: (none) → Prototypes and side projects - free to start, no sales call, Teams needing broa…
8. 2026-06-21 Avoid If: (none) → You have strict compliance requirements
9. 2026-06-21 Scoring Methodology: (none) → Scores are computed deterministically from this profile's published, sourced fi…
10. 2026-06-21 Score Agent Friendliness: (none) → 40
11. 2026-06-21 Score Pricing Transparency: (none) → 100
12. 2026-06-21 Robots Allows Agents: (none) → Yes
13. 2026-06-21 API Reference URL: (none) → https://apidocs.killbill.io/
14. 2026-06-21 Docs URL: (none) → https://docs.killbill.io/
15. 2026-06-21 Has Structured Data: (none) → Yes
16. 2026-06-21 Rendering: (none) → static
17. 2026-06-21 Llms Txt Present: (none) → No
18. 2026-06-21 Has Published Pricing: set to Yes
19. 2026-06-21 Free Tier Available: set to Yes
20. 2026-06-21 Free Tier Details: set to 100% open-source under Apache 2.0 license. Self-host for free with no monthly c…
21. 2026-06-21 Self Serve Signup: set to Yes
22. 2026-06-21 Requires Sales Call: set to No
23. 2026-06-21 Enterprise Plan Available: set to Yes
24. 2026-06-21 GDPR: set to No
25. 2026-06-21 PCI DSS: set to No
26. 2026-06-21 SLA Published: set to Yes
27. 2026-06-21 Known Restrictions: set to Open-source self-host is free but requires own infrastructure; vendor does not …
28. 2026-06-21 Auth Methods: set to basic, api_key
29. 2026-06-21 Auth Docs URL: set to https://docs.killbill.io/latest/user_management
30. 2026-06-21 API Style: set to rest
31. 2026-06-21 Base URL: set to http://127.0.0.1:8080/1.0/kb
32. 2026-06-21 API Version: set to 1
33. 2026-06-21 Versioning Scheme: set to url
34. 2026-06-21 Stability: set to ga
35. 2026-06-21 Quickstart URL: set to https://docs.killbill.io/latest/quick_start_with_kb_api
36. 2026-06-21 Idempotency Supported: set to Yes
37. 2026-06-21 Error Format: set to vendor-specific
38. 2026-06-21 Webhook Events URL: set to https://docs.killbill.io/latest/kill_bill_events
39. 2026-06-21 Requires Verification: set to No
40. 2026-06-21 Starting Price Usd: set to 40
41. 2026-06-21 Price Basis: set to month
42. 2026-06-21 Slug: set to kill-bill
43. 2026-06-21 Launched At: set to 2010-01-01
44. 2026-06-21 Notable Customers: set to Groupon, CARFAX, Rocket Lawyer, HP, Rakuten
45. 2026-06-21 Fields Not Found: set to soc2, hipaa, iso_27001, documented_rate_limits, minimum_commitment, specific_av…
46. 2026-06-21 Source Confidence: set to high
47. 2026-06-21 Extractor: set to claude-subagent:sonnet
48. 2026-06-21 Last Verified At: set to 2026-06-21T00:00:00.000Z
49. 2026-06-21 Status: set to published
50. 2026-06-21 Free Tier Limit: set to open-source self-host (Apache 2.0, no cost)

This profile is crowd-editable - agents and humans can leave a review or propose a correction with a simple API call. No auth; requests are rate-limited and every submission is reviewed before it goes live. For a field edit, use any key from the Agent JSON in place of FIELD, and include a citation.

curl -X POST https://apio.sh/api/feedback/kill-bill \
  -H 'Content-Type: application/json' \
  -d '{"kind":"review","rating":5,"body":"Your experience with this API…"}'

curl -X POST https://apio.sh/api/suggest/kill-bill/FIELD \
  -H 'Content-Type: application/json' \
  -d '{"value":"corrected value","citations":[{"url":"https://source.example/page","excerpt":"supporting quote"}],"note":"what changed and why"}'

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