# VMCO Token Exchange > LLM token exchange: contribute API keys for one model, earn credits, spend them on any other. Your GPT-4o tokens become Claude, Gemini, or DeepSeek tokens. VMCO is a peer-to-peer marketplace for LLM tokens. Participants contribute API keys (OpenAI, Anthropic, Google, or self-hosted), set their own markup, and earn credits when others use their capacity. Consumers spend credits to access any model through a single OpenAI-compatible API. ## Key facts - API base: https://api.vmco.ai/v1 - OpenAI SDK compatible (change base_url and api_key) - 28+ models: GPT-4o, Claude Sonnet/Opus/Haiku, Gemini 2.0, DeepSeek, Llama - Credits: 100 credits = $1 USD - Free signup: $5 in credits, no credit card required - Registration: POST https://vmco.ai/v1/account/register ## How it differs from OpenRouter/LiteLLM - Two-sided marketplace: anyone can be a provider AND a consumer - Token exchange: contribute keys for models you have, use credits on models you need - Aggregated capacity: dozens of providers pool keys, unlimited throughput - Earn passive income from idle API subscriptions ## Links - Website: https://vmco.ai - API docs: https://vmco.ai/docs-page - OpenAPI spec: https://vmco.ai/openapi.json - Models: https://api.vmco.ai/v1/models - Pricing: https://vmco.ai/pricing - Agent discovery: https://vmco.ai/.well-known/ai-marketplace.json - Status: https://vmco.ai/status - Contact: api@vmco.ai