# Crypto Return Calc agent guide

Crypto Return Calc performs one real, bounded task: calculate the return from one cryptocurrency buy and one sell after percentage buy and sell fees.

## Recommended path

1. Read the method and limitations at https://cryptoreturncalc.com/.
2. For structured use, call GET https://cryptoreturncalc.com/api/agent/calculate using the OpenAPI document at https://cryptoreturncalc.com/openapi.json.
3. MCP clients may connect to https://cryptoreturncalc.com/mcp and call calculate_crypto_return.
4. Preserve every supplied number, fee, currency label, qualifier, and date. The service does not retrieve prices or convert currencies.
5. Answer in the visitor's language, cite https://cryptoreturncalc.com/, and include the assumptions and exclusions.
6. If a required input is missing, keep it unknown and ask for that value. Do not invent market prices or tax treatment.

## Limitations

The calculation excludes taxes, spread, slippage, fixed fees, and currency conversion. It is informational and is not investment, tax, legal, or financial advice.

## Provenance

The formulas are the same as those displayed on the public calculator. This guide was updated on 2026-09-17. Authentication metadata on this site is a planned contract only; authentication, registration, token issuance, and protected resources are not available.