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Returned before the payment gate on paid requests, so a malformed call is never charged. JSON body: { error: } plus usage hints.", "example": { "error": "invalid request" } }, "402": { "description": "Payment required — x402 v2 challenge; the accepts array lists scheme, network, and amount. Retry the same request with a PAYMENT-SIGNATURE (v2) or X-PAYMENT (v1) header. Verification is free." }, "500": { "description": "Unexpected server error. If a payment settled without a usable result, contact info@theaslangroupllc.com with the settlement tx hash for a re-run or credit.", "example": { "error": "upstream_failed" } } }, "example": { "annualized_yield_pct": null, "break_even_analysis": { "current_spread_bps": 22, "gap_bps": 4, "min_spread_bps_to_break_even": 26 }, "fee_breakdown": { "bridge_fee_usd": 0, "flash_fee_usd": 0, "gas_usd": 0.5, "slippage_usd": 5, "taker_fee_buy_usd": 10, "taker_fee_sell_usd": 10, "total_costs_pct": 0.255, "total_costs_usd": 25.5, "withdrawal_fee_usd": 0 }, "gross_spread_pct": 0.221, "gross_spread_usd": 22.12, "inputs": { "arb_type": "spot", "entry_price": 67800, "exit_price": 67950, "gas_usd": 0.5, "slippage_bps": 5, "taker_fee_bps": 10, "trade_size_usd": 10000 }, "net_profit_pct": -0.034, "net_profit_usd": -3.38, "scale_analysis": [ { "net_pct": 0.032, "net_profit_usd": 16.1, "size_usd": 50000 }, { "net_pct": 0.057, "net_profit_usd": 57.2, "size_usd": 100000 }, { "net_pct": 0.072, "net_profit_usd": 357.5, "size_usd": 500000 } ], "suggestion": "This spot arb is marginal at $10k. Minimum $50k+ for positive P&L. 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Returned before the payment gate on paid requests, so a malformed call is never charged. JSON body: { error: } plus usage hints.", "example": { "error": "invalid request" } }, "402": { "description": "Payment required — x402 v2 challenge; the accepts array lists scheme, network, and amount. Retry the same request with a PAYMENT-SIGNATURE (v2) or X-PAYMENT (v1) header. Verification is free." }, "500": { "description": "Unexpected server error. If a payment settled without a usable result, contact info@theaslangroupllc.com with the settlement tx hash for a re-run or credit.", "example": { "error": "upstream_failed" } } }, "example": { "annualized_yield_pct": null, "break_even_analysis": { "current_spread_bps": 22, "gap_bps": 4, "min_spread_bps_to_break_even": 26 }, "fee_breakdown": { "bridge_fee_usd": 0, "flash_fee_usd": 0, "gas_usd": 0.5, "slippage_usd": 5, "taker_fee_buy_usd": 10, "taker_fee_sell_usd": 10, "total_costs_pct": 0.255, "total_costs_usd": 25.5, "withdrawal_fee_usd": 0 }, "gross_spread_pct": 0.221, "gross_spread_usd": 22.12, "inputs": { "arb_type": "spot", "entry_price": 67800, "exit_price": 67950, "gas_usd": 0.5, "slippage_bps": 5, "taker_fee_bps": 10, "trade_size_usd": 10000 }, "net_profit_pct": -0.034, "net_profit_usd": -3.38, "scale_analysis": [ { "net_pct": 0.032, "net_profit_usd": 16.1, "size_usd": 50000 }, { "net_pct": 0.057, "net_profit_usd": 57.2, "size_usd": 100000 }, { "net_pct": 0.072, "net_profit_usd": 357.5, "size_usd": 500000 } ], "suggestion": "This spot arb is marginal at $10k. 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