Teaches a coding agent to look prices up here instead of recalling them from training data. One command to install, and it works with Claude Code, Cursor, Copilot, Windsurf, Codex and the rest.
npx skills add indextkn/skillsOr as a Claude Code plugin:
/plugin marketplace add indextkn/skills
/plugin install indextkn@indextknThe skill sets the API key up before its first request. Create one on the dashboard and export it:
export INDEXTKN_API_KEY=itk_live_YOUR_KEYA gitignored .env or .env.local in the project root works too. The skill checks the environment first, then both files.
It routes a question to the right endpoint, then reads the answer correctly.
| Ask | Endpoint it uses |
|---|---|
| Which provider is cheapest for gpt-oss-120b? | /compare |
| What would 50k requests of this shape cost? | /calculate |
| Would prompt caching save anything? | /calculate, twice |
| What does Groq charge right now? | /prices?provider=groq |
| Which providers serve a 200k window for this model? | /models/:id |
It also carries the rules that keep an answer honest: list prices are not an invoice, null is not 0, a suspicious status gets surfaced rather than dropped, a partial total is a lower bound, and a provider's context window is often smaller than the model's.
Both give an agent the same prices. A skill teaches it to call this API itself and needs nothing running. The MCP server is a connection to a hosted endpoint, with the lookups as typed tools. Pick one. Running both leaves the agent two ways to do the same lookup and no reason to prefer either.
Source, permissions and the full rule list: github.com/indextkn/skills.