Best payment APIs for SaaS subscriptions

We asked 10 models: The best payment processing APIs for charging subscriptions in a SaaS app. Each named its own top 10.

Asked 4 ways: List request · Buyer asking for advice · Search query · Worth paying for?. Share of voice pools every wording.

Agreement between models
78%
Same model, run twice
85%
Different picks
20

When agreement between models is well below a model's agreement with itself, the split reflects real differences in taste rather than randomness.

The consensus

Each cell is the position that model gave the pick; blank means it left the pick off. Click a row for each model's reasoning.

#PickScoreListed byClaude Haiku 5.5GPT-6 LunaGemini 4 ArgonQwen 3.8 FlashDeepSeek V4 ProGLM-5.3Kimi K3MiniMax M3Mistral Large 4Nemotron 3 Ultra

5 lower-scoring picks are not shown; every ballot below lists them in full.

Most divisive

Picks most models listed, at very different positions

Hot takes

Picks that appear on only one ballot

Every ballot

Hover a pick to find it on the other ballots. Marked picks appear on no other ballot.

Claude Haiku 5.5

  1. Stripe
  2. Braintree
  3. Chargebee
  4. Recurly
  5. Adyen
  6. Paddle
  7. Chargify
  8. Zuora
  9. Authorize.net
  10. Checkout.com

79% with consensus · 82% self-consistent

GPT-6 Luna

  1. Stripe
  2. Adyen
  3. Braintree
  4. Chargebee
  5. Paddle
  6. Recurly
  7. PayPal
  8. Square
  9. Authorize.net
  10. Zuora

76% with consensus · 81% self-consistent

Gemini 4 Argon

  1. Stripe
  2. Paddle
  3. Braintree
  4. Lemon Squeezy
  5. Chargebee
  6. Adyen
  7. Recurly
  8. GoCardless
  9. Zuora
  10. Maxio

78% with consensus · 81% self-consistent

Qwen 3.8 Flash

  1. Stripe
  2. Paddle
  3. Chargebee
  4. Recurly
  5. Braintree
  6. PayPal
  7. Lemon Squeezy
  8. Adyen
  9. Authorize.net
  10. Moogpay

84% with consensus · 95% self-consistent

DeepSeek V4 Pro

  1. Stripe
  2. Chargebee
  3. Recurly
  4. Paddle
  5. Braintree
  6. Zuora
  7. Lemon Squeezy
  8. Metronome
  9. FastSpring
  10. Orb

85% with consensus · 77% self-consistent

GLM-5.3

  1. Stripe
  2. Chargebee
  3. Recurly
  4. Paddle
  5. Braintree
  6. Zuora
  7. Adyen
  8. Lemon Squeezy
  9. Square
  10. Authorize.net

89% with consensus · 85% self-consistent

Kimi K3

  1. Stripe
  2. Chargebee
  3. Braintree
  4. Paddle
  5. Recurly
  6. Adyen
  7. PayPal
  8. Zuora
  9. Lemon Squeezy
  10. Square

95% with consensus · 74% self-consistent

MiniMax M3

  1. Stripe
  2. Paddle
  3. Chargebee
  4. Recurly
  5. Adyen
  6. PayPal
  7. 2Checkout
  8. Braintree
  9. Square
  10. Lemon Squeezy

82% with consensus · 96% self-consistent

Mistral Large 4

  1. Stripe
  2. Paddle
  3. Chargebee
  4. Recurly
  5. Zuora
  6. Adyen
  7. Braintree
  8. PayPal
  9. Maxio
  10. Square

85% with consensus · 92% self-consistent

Nemotron 3 Ultra

  1. Stripe
  2. Braintree
  3. Paddle
  4. Chargebee
  5. Recurly
  6. Adyen
  7. Zuora
  8. PayPal
  9. Square
  10. FastSpring

88% with consensus · 86% self-consistent

Who agrees with whom

Overlap between two models' lists, weighted toward the top · 100 means identical · Color runs from 65 (lightest) to 95 (darkest)

Claude Haiku 5.5GPT-6 LunaGemini 4 ArgonQwen 3.8 FlashDeepSeek V4 ProGLM-5.3Kimi K3MiniMax M3Mistral Large 4Nemotron 3 Ultra
Claude Haiku 5.5797275747883747586
GPT-6 Luna797372657181727081
Gemini 4 Argon727380687078757881
Qwen 3.8 Flash757280808281918978
DeepSeek V4 Pro746568809584727874
GLM-5.3787170829588778278
Kimi K3838178818488798087
MiniMax M3747275917277799177
Mistral Large 4757078897882809181
Nemotron 3 Ultra868181787478877781