Your agent shops for its own API keys now

What it does

Grandet maintains listed prices for models across 1,800+ official APIs, inference providers, and relay sites, and exposes that data to your AI agent as a Skill or an anonymous MCP server. Ask “find me the cheapest Claude Sonnet 4.6 API” and it ranks options by listed price, flags conditions like minimum top-ups, and can even edit your app’s config to connect the winner. It also tracks free tiers, trial credits, and relay sign-up offers.

The interesting bit

The discipline around what it won’t tell you: it ranks by listed price only, never vouches for a site’s quality claims, keeps USD credit, CNY credit, and cash prices in separate buckets, and admits when it has no measurements for speed or downgraded models. For a domain as scam-adjacent as API relays, that restraint is the feature. The connect flow also keeps your API key out of the chat entirely — you paste it into a terminal command yourself.

Key highlights

• Remote MCP server at grandet.ai/mcp — Streamable HTTP, no account, no key
• Six tools including grandet_find_cheapest_api, grandet_find_free_credits, and grandet_quote_evidence with links to price sources
• Connect flow backs up your config, verifies the key without spending credit, and supports “undo”
• First-class support for Codex, Claude Code, Cursor, OpenCode, Gemini CLI and others via scripts/connect.mjs
• All the catalogue data is available as JSON and plain HTTP endpoints, plus a relay jargon glossary (yes, it explains 官转 and 逆向)

Caveats

• Listed price says nothing about quality or reliability — the README is blunt about this, and so is the tool when asked
• In cloud chat apps, it can only hand you commands to run yourself rather than making the change
• Mixed licensing: Skill files are Apache-2.0, catalogue code is AGPL-3.0-only, and the supplier data itself carries no open-data licence

Verdict

If you burn tokens through relays or hunt free credits across providers, this is a genuinely useful shopping layer — especially if you live in Claude Code or Codex. If you only ever use one official API, you can skip it.