SML FX Convert offers pay-per-call ECB reference-rate currency conversion for AI agents

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SML FX Convert is a pay-per-call currency conversion API aimed at AI agent workflows that need to price, report, or budget across currencies. Its information endpoint is free and names the European Central Bank EXR daily reference rates as the data source. Each accepted conversion costs $0.001 USDC on Base mainnet, and an unpaid request returns an HTTP 402 challenge with no API key or account required. The service is designed to fail closed, so invalid inputs or unavailable rate data are not charged or converted into fabricated results. The provider states that the output is a reference-rate calculation, not a bank, exchange, or executable trading quote.

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