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Start free. Scale when you need to.

Every new account gets 100 free credits once — no card required.

Free

$0

100 credits · one time

One-time credits to try every model. No card required.

Start free

Access

$25.00/mo

25,000 credits every month

  • All free open-source models in one API
  • Text, vision, image, video, audio, and embeddings
  • Metered credits — only pay for what you use

Fresh credits every month. Cancel anytime.

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Bring Your Own Key

$5.00/mo

Use your own provider keys

  • Store Groq, Google Gemini, Hugging Face, and OpenRouter keys
  • Unified API — one endpoint for every modality
  • Keys encrypted at rest (AES-256-GCM)
  • No model credits charged — pay providers directly
  • Same playground and rate limits as paid plans

Connect your own provider accounts. Synapse routes requests; you pay providers directly.

Get started

Per-model rates

Credits are deducted based on usage. All models run on free open-source providers — you only pay for gateway access.

Text Generation

Nous: Hermes 3 405B Instruct (free)
1 credits per 1K tokens
Llama 3.1 8B Instant
1 credits per 1K tokens
Poolside: Laguna XS.2 (free)
1 credits per 1K tokens
Poolside: Laguna M.1 (free)
1 credits per 1K tokens
Google: Gemma 4 26B A4B (free)
1 credits per 1K tokens
Google: Gemma 4 31B (free)
1 credits per 1K tokens
NVIDIA: Nemotron 3 Super (free)
1 credits per 1K tokens
LiquidAI: LFM2.5-1.2B-Thinking (free)
1 credits per 1K tokens
LiquidAI: LFM2.5-1.2B-Instruct (free)
1 credits per 1K tokens
NVIDIA: Nemotron 3 Nano 30B A3B (free)
1 credits per 1K tokens
NVIDIA: Nemotron Nano 12B 2 VL (free)
1 credits per 1K tokens
Qwen: Qwen3 Next 80B A3B Instruct (free)
1 credits per 1K tokens
NVIDIA: Nemotron Nano 9B V2 (free)
1 credits per 1K tokens
OpenAI: gpt-oss-120b (free)
1 credits per 1K tokens
OpenAI: gpt-oss-20b (free)
1 credits per 1K tokens
Qwen: Qwen3 Coder 480B A35B (free)
1 credits per 1K tokens
Venice: Uncensored (free)
1 credits per 1K tokens
Meta: Llama 3.3 70B Instruct (free)
1 credits per 1K tokens
Meta: Llama 3.2 3B Instruct (free)
1 credits per 1K tokens
Cohere: North Mini Code (free)
1 credits per 1K tokens
Nex AGI: Nex-N2-Pro (free)
1 credits per 1K tokens
NVIDIA: Nemotron 3.5 Content Safety (free)
1 credits per 1K tokens
NVIDIA: Nemotron 3 Ultra (free)
1 credits per 1K tokens
NVIDIA: Nemotron 3 Nano Omni (free)
1 credits per 1K tokens
GPT-OSS 20B
2 credits per 1K tokens
Gemini 2.5 Flash
2 credits per 1K tokens
Qwen3 32B
3 credits per 1K tokens
Llama 3.3 70B Versatile
4 credits per 1K tokens

Image to Text

Gemini 2.5 Flash (Vision)
2 credits per 1K tokens
Llama 4 Scout (Vision)
3 credits per 1K tokens

Text to Image

FLUX.1 [schnell]
20 credits per image
Stable Diffusion XL
25 credits per image
FLUX.1 [dev]
40 credits per image

Image to Image

FLUX.1 Kontext [dev]
40 credits per image

Text to Video

LTX Video
200 credits per request

Text to Speech

Kokoro 82M
4 credits per 1K characters
PlayAI TTS
5 credits per 1K characters

Speech to Text

Whisper Large v3 Turbo
1 credits per second
Whisper Large v3
2 credits per second

Embeddings

BGE Base EN v1.5
1 credits per 1K tokens
Multilingual E5 Large
1 credits per 1K tokens