Should I use invoice date or payment date?
Invoice-date workflows usually use the document date; cash and settlement workflows may use payment date. Confirm your policy before filing.
Invoice-date FX proof
Exchange rate by invoice date
Look up an invoice-date reference rate and copy a citation, API URL, CSV URL, or invoice FX proof workflow link.
Reference answer
USD/EUR on 2026-06-03 can be checked with FXpeek as a dated historical reference-rate workflow; keep the rate page, CSV URL, API URL, and retrieval date with the invoice or report record.
GET https://fxpeek.com/api/history?from=USD&to=EUR&date=2026-06-03
GET https://fxpeek.com/api/csv?from=USD&to=EUR&days=365
=IMPORTDATA("https://fxpeek.com/api/csv?from=USD&to=EUR&days=365")When to use this tool
Use this page when an invoice, receipt, ecommerce order, or reimbursement record needs the exchange rate for a specific past date.
- Choose invoice date, amount, and currency pair.
- Copy the dated reference page and API link.
- Use the PDF proof workflow when a record needs an attachment.
Workflow
- Enter invoice date
- Choose pair and amount
- Copy source URL
- Generate proof only when the preview fits your record
FAQ
Is this suitable for a filing workflow?
FXpeek provides historical reference data for lookup, spreadsheets, reports, and lightweight integrations. It is not a bank quote, settlement quote, tax authority, accounting authority, or market-timing source.