LLM Token & API Cost Estimator

Estimate token count from text (or pass exact counts) and compute API cost at per-million prices.

Free tier eligible — 500 calls/month with a free key from /pricing; x402 pay-per-call above quota.

Parameters

Parameter	Type	Required	Description
`text`	string	optional	Text to estimate input tokens from (~4 chars/token)
`input_tokens`	integer	optional	Exact input token count (overrides text estimate)
`output_tokens`	integer	optional	Output token count
`price_per_1m_input`	number	optional	USD price per 1,000,000 input tokens
`price_per_1m_output`	number	optional	USD price per 1,000,000 output tokens (defaults to input price)
`calls`	integer	optional	Number of identical calls to total (default 1)

Call it over MCP (JSON-RPC 2.0)

curl -s https://wingmanprotocol.com/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{"jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": {"name": "token_cost", "arguments": {"text": "hello from an agent", "input_tokens": 10, "output_tokens": 10}}}'

Or plain HTTP

curl -s https://wingmanprotocol.com/tools/token_cost \
  -H 'Content-Type: application/json' \
  -d '{"text": "hello from an agent", "input_tokens": 10, "output_tokens": 10}'

Try it live

Edit the JSON and run it — this POSTs to https://wingmanprotocol.com/tools/token_cost from your browser.

This tool is x402-metered — agents pay per call with USDC on Base. The 402 response below is the standard x402 payment-requirements envelope: sign the EIP-3009 authorization and retry with the X-Payment header, or get a free key at /pricing (500 calls/month, no card, no crypto).