CostMCP · James Yang

← Home

CostMCP is an AI-native cost ledger: ingest usage and expenses, roll up monthly and per-project spend, and expose the same ledger to agents over MCP. Monorepo with a Next.js API, core CostMessage types, Supabase (RLS + budgets), and a stdio/HTTP MCP server with tools for usage, subscriptions, obligations, projects, and budget status.

Contributions

Defined CostMessage ingest and Phase 0 REST (health, messages, monthly summary, project spend, budgets).
Shipped MCP tools (log_usage, expenses, subscriptions, obligations, projects, estimate_cost, budget/summary reads) at mcp.costmcp.com.
Supabase schema with RLS, global budget, and Mintlify API/MCP/OAuth docs.

Outcomes

Live MCP endpoint for agents plus local stdio/HTTP modes.
Product + architecture specs and ChatGPT app submission assets in-repo.