// static utility · runs entirely in your browser · nothing uploaded

MCP TOKEN LEDGER

A schema token-cost calculator for Model Context Protocol tool definitions

01 WHY TOKEN COST MATTERS

Every tool you register with an MCP client gets serialized — name, description, and the full inputSchema — and stuffed into the model's context on every single request, whether that tool gets called or not. Ten tools with verbose descriptions and deep nested schemas can quietly burn thousands of tokens before the user has typed a word.

That's context window you don't get back, latency you're paying for, and — on metered inference — a real line item. A bloated tool schema is invisible until someone counts it. This counts it.

Paste your server's tool list below. Get a table, worst offender first.

02 LOAD SCHEMA

STATUS: AWAITING INPUT

03 TOKEN LEDGER

NO SCHEMA LOADED

Paste JSON, upload a file, or load the sample above to print the token breakdown here.

04 SUPPORT THIS TOOL — PAY WITH USDC

This tool is free and stays free — no license gate, no account, no paywall. If it saved you time, you can send a tip in USDC. This is voluntary, not required to use anything on this page.

NETWORK

USDC on Base (also reachable via Polygon — same EVM address, different chain; make sure your wallet sends on a network that supports USDC before confirming)

ADDRESS

0xa9FD635566A0E84dBf60a76fe992C5E31163E4cA
  • Self-custody wallet, controlled directly by this project — no payment processor, no intermediary.
  • This is a voluntary gift, not a purchase — no goods or services are exchanged for it, and the tool works identically whether you send one or not.
  • This is the only payment method available today.
  • No refund infrastructure exists yet — there is no human-staffed support desk. Only send what you're comfortable not being able to reverse.
  • Double-check the network in your wallet before sending. Sending on an unsupported network can result in permanent loss of funds.