InferCPI

InferCPI API

InferCPI tracks what AI inference costs: list prices, what buyers actually pay, the cost of a fixed level of capability, open vs closed models, third-party hosts, self-hosting, and cost per completed task. Site: https://infercpi.com.

This repo holds the public API docs, examples and the MCP server. The data is free, needs no key, and is licensed CC BY 4.0: cite as InferCPI, infercpi.com.

API

Static JSON at https://infercpi.com/v1/. Full reference: https://infercpi.com/api.html.

File	What
latest.json	Last value of every series, plus the weekly editorial note
index.json	Catalogue of every series: point count, dates, method string, URL
series/<signal>/<key>.json	Full history: points: [[unix_ts, value], ...] and method
basket.json	Every model priced this week: input, output and blended $/1M, context, Epoch ECI, open or closed
events.json	Launches, price cuts, increases and removals since Sep 2023
speed.json	Our daily speed run: time to first token, tokens per second
token_mix.json	Tokens routed through OpenRouter per week, by lab and region
capex.json	Hyperscaler capex, chip and cloud revenue by quarter (SEC filings)

curl -s https://infercpi.com/v1/latest.json | jq '.latest["weighted_index/paid_usd_1m"]'

More in examples/.

MCP server

mcp_server.py gives agents ten read-only tools over the API: index_latest, index_series, index_catalogue, basket, model_price, events, speed, open_vs_closed, self_hosting, cost_per_task.

Hosted, no key: https://infercpi.com/mcp (streamable HTTP).

claude mcp add --transport http infercpi https://infercpi.com/mcp   # Claude Code

Claude.ai and Claude Desktop: Settings → Connectors → Add custom connector, paste the URL.

Or run it yourself:

mkdir -p ~/.local/share/infercpi
curl -so ~/.local/share/infercpi/mcp_server.py https://raw.githubusercontent.com/Infer-CPI/api/main/mcp_server.py
pip install mcp                                       # mcp 1.x or 2.x both work
claude mcp add infercpi -s user -- python3 ~/.local/share/infercpi/mcp_server.py   # Claude Code
python3 ~/.local/share/infercpi/mcp_server.py --http  # or: streamable HTTP on :8765

Claude Desktop (claude_desktop_config.json):

{ "mcpServers": { "infercpi": { "command": "python3", "args": ["/home/YOU/.local/share/infercpi/mcp_server.py"] } } }

It reads https://infercpi.com by default; set INFERCPI_BASE to point elsewhere.

Method and sources

How every series is built: https://infercpi.com/methodology.html. Inputs: LiteLLM and pydantic/genai-prices (MIT), Epoch AI Capabilities Index (CC BY 4.0), OpenRouter rankings (CC BY 4.0), SEC filings (public domain). Speed and cost per task are our own measurements.

Licence

Code in this repo: MIT. Index data: CC BY 4.0. Questions, corrections or a series you need: open an issue.