# SF·SIX — San Francisco Super Intelligence Exchange > SF·SIX (San Francisco Super Intelligence Exchange) is ColdAI’s exchange for AI models: a source-backed directory of AI model prices, benchmarks and usage, prediction markets on AI model prices and usage, and model token offerings, with trading on the Hedera testnet using test funds. SF·SIX is built by ColdAI (https://coldai.org/). Prices and usage are dated observations from named sources; missing values are unknown, not free. Trading, model token offerings and prediction markets use Hedera testnet test funds with no real value. ## Key pages - [How SF·SIX works](https://sfsi.exchange/how-it-works): Direct answers: model token offerings, prediction market resolution, fees, verification, testnet status. - [AI model directory](https://sfsi.exchange/directory): Search and compare AI models with dated API prices, benchmarks, capabilities and providers. - [All AI models](https://sfsi.exchange/models): Every source-qualified model profile, paginated. - [AI developers](https://sfsi.exchange/developers): Model developers with their current model profiles. - [Inference providers](https://sfsi.exchange/providers): Providers and channels serving each model, with billing units and observation dates. - [Models by capability](https://sfsi.exchange/categories): Text, image, video, audio, vision, tool-calling, long-context and free-offer model lists. - [AI API pricing (live)](https://sfsi.exchange/pricing): Standard-tier API prices per 1M tokens for flagship, small and open-weight LLMs, and per-unit prices for image, video and speech models. - [Cheapest LLM APIs](https://sfsi.exchange/pricing/cheapest-llm-api): Language models ranked by live standard price inside Artificial Analysis intelligence bands, plus the cheapest host for popular open models. - [AI API price changes (live)](https://sfsi.exchange/ai-price-changes): Every recorded cut and increase of a published AI API price in the last 30 days (old and new price, % change, provider, date), new priced listings and a weekly summary. - [New AI models](https://sfsi.exchange/new-ai-models): Significant AI model releases by week of first sighting, with release date, developer and live API price (no LoRAs, merges, quantizations or aliases). - [Fastest LLM APIs](https://sfsi.exchange/fastest-llm-api): Throughput and latency of LLM API endpoints by provider and tier (OpenRouter, previous 30 minutes). - [Most-used AI models](https://sfsi.exchange/rankings/most-used-ai-models): Daily token rankings of AI models on OpenRouter with week-on-week change and share by developer. - [AI prediction markets](https://sfsi.exchange/prediction-markets): How SF·SIX markets on AI model prices and usage work and resolve, with the models that have price ladders (testnet, test funds only). - [Model token offerings](https://sfsi.exchange/ito): Testnet model token launches on bonding curves and their aftermarkets. - [Prediction markets app](https://sfsi.exchange/predict): Testnet markets on AI model prices, usage and releases (test funds only). - [NATDAQ](https://sfsi.exchange/natdaq): AI model usage indexes rebased to 100, with coverage and methodology. - [AI cost calculator](https://sfsi.exchange/ai-cost-calculator): Estimate monthly inference cost for a workload across priced models, with chatbot, RAG and batch summarisation presets (indicative, not a quote). - [Sources and methodology](https://sfsi.exchange/methodology): Where the data comes from, what is published, and what the directory does not claim. - [Public API](https://sfsi.exchange/developers-api): Free, keyless read-only JSON API (OpenAPI 3.1): model prices, price changes and history, benchmarks, OpenRouter usage snapshots and testnet prediction market data, with rate limits and attribution rules. - [Guides](https://sfsi.exchange/guides): Model selection and pricing guides. ## How it works - **Does SF·SIX use real money?** No. Trading, model token offerings and prediction markets run on the Hedera testnet with test funds that have no real value. Real-money trading, custody and mainnet actions remain separately gated and are not offered. - **How do model token offerings work?** A creator launches a model token for an AI model they serve, and one model token pays for one input or one output AI token of that model. New offerings launch on a bonding curve whose price rises as tokens are bought, toward a target raise before a deadline chosen by the creator, with the terms (supply, curve, deadline and creator royalty) fixed at launch and bound into a terms hash. Tokens can be bought (and, on a curve, sold back) right away, but model use opens only when the offering's open market opens: after the bonding curve graduates, or once a fixed-price sale is fully sold and settled. - **How do prediction markets on AI models resolve?** Before you trade, each market shows its exact question, named data source, observation window, cutoff and versioned resolution rule. Per-model price markets settle on the mean standard USD price per million tokens across the providers listed by OpenRouter and the Hugging Face router on the close day, and a missing source capture voids the market. A proposed result is not final: challenges or missing and conflicting evidence can delay or void resolution. - **What fees does SF·SIX charge?** Bonding-curve trades pay a 1% platform fee and a 0.3% creator fee, and a graduating offering pays a 2.5% graduation fee. Aftermarket resales carry the creator royalty fixed at launch (0–50%) and a small platform royalty as native Hedera token fees, and Hedera network fees are passed through at cost plus 20%. Inference through the SF·SIX API is priced at provider cost plus 20% provider fees plus a 10% platform fee. - **What does a verification badge mean?** A verified badge marks an official AI developer or inference provider account. It is granted only after an SF·SIX operator reviews a claim from someone with a verified company-domain email, never inferred from a name, handle or logo, and it is re-checked regularly and can be revoked. ## Docs - [Sources, methodology and editorial policy](https://sfsi.exchange/methodology) - [Public API documentation](https://sfsi.exchange/developers-api) and its [OpenAPI 3.1 description](https://sfsi.exchange/api/aiex/v2/openapi.json) - [NATDAQ methodology and limitations](https://sfsi.exchange/guides/natdaq-index-methodology) - [Model selection guides](https://sfsi.exchange/guides) - [Full text for language models](https://sfsi.exchange/llms-full.txt) ## Optional - [ColdAI](https://coldai.org/): the company that builds and operates SF·SIX. - [About ColdAI](https://coldai.org/about/) - [ColdAI research publications](https://coldai.org/publications/research/) - [Medusa](https://coldai.org/medusa/): ColdAI's playground for chatting with and comparing models.