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HTTP status: 400 · Title: “Amount too large”

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When it fires

amount exceeds MAX_USDC_PER_TRADE. This is a defence-in-depth check distinct from your key’s per-trade and daily spending limits — it catches obvious mistakes regardless of your tier.

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Why it happens

The most common cause is a decimal-place mistake: passing 1000000000000000000 (“1 USDC in 18-decimal atomic units”) instead of 1 (“1 USDC in human units”). The public API takes amounts in human units (the same string a person would type), not 18-decimal atomic units.

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How to fix

  • Pass amount as a string of the human-unit USDC value: "100", "0.50", "2500".
  • If you have an atomic value, divide by 10^6 (USDC is 6 decimals on-chain, but our API normalises to “USDC the user thinks about”).
  • For sustained high-value flows above MAX_USDC_PER_TRADE, request a tier upgrade — your key’s per_trade_limit_usdc can be raised, but the absolute cap is a platform-level safety net.