Editing Portal:Crypto and Blockchain (section)

=== Exchanges, trading APIs, and financial reporting ===

Cryptocurrency exchanges created another role for Perl: API integration. Exchanges usually expose REST APIs, WebSocket feeds, authenticated endpoints, order books, trades, balances, deposits, withdrawals, and historical records. Perl can call these APIs, normalize the responses, and store them in databases for reporting or automation.

For example, `Finance::Crypto::Exchange::Kraken` is described as a Perl module for talking to the Kraken REST API.<ref>CPAN, “Finance-Crypto-Exchange-Kraken README,” https://www.cpan.org/modules/by-module/Finance/Finance-Crypto-Exchange-Kraken-0.004.readme, accessed July 3, 2026.</ref>

This exchange-integration role is similar to Perl’s older use in finance. Perl has long been used for reports, reconciliations, feeds, ETL, batch jobs, and audit trails. Cryptocurrency created new data sources, but the basic work remained familiar: fetch records, parse JSON, verify values, normalize timestamps, store transactions, and generate reports.

Useful Perl crypto-exchange tasks include:

* downloading trade history;
* reconciling deposits and withdrawals;
* converting exchange exports into tax or accounting formats;
* monitoring balances;
* detecting missing fills or failed orders;
* storing order-book snapshots;
* checking API uptime;
* producing CSV reports;
* alerting on unexpected movement.

Automated trading is possible in Perl, but it introduces additional risk. Exchange APIs can change, rate limits can apply, credentials can leak, orders can execute unexpectedly, and market data can be delayed or misunderstood. Perl is capable of building trading tools, but capability should not be confused with safety.