{"uid":"cap_O0wMBg6VislKhOj8twm8x","slug":"x402-silverbackdefi-app-cea8ba99","name":"SilverbackDeFi Swap Quote","description":"Provides cross-chain token swap quotes (EVM & Solana), accepting paid requests in multiple token schemes and returning exact-amount pricing and timeout info.","url":"https://x402.silverbackdefi.app/api/v1/swap-quote","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"tokenIn":{"type":"string","description":"Input token address (0x format) or symbol (WETH, USDC)"},"amountIn":{"type":"string","description":"Amount to swap (human readable, e.g. '1.5')"},"tokenOut":{"type":"string","description":"Output token address (0x format) or symbol"}}},"responseSchema":{"type":"json","example":{"fee":"0.3%","route":"WETH -> USDC","success":true,"amountOut":"3500.50","priceImpact":"0.15%"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"down","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_1ziS9moDM9d3MPSXMtuJk","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns the optimal token swap route and quote on the Base chain using 0x Permit2","exampleAgentPrompt":"What's the best swap route to trade 1.5 WETH for USDC on Base right now — show me the expected output amount and route?","exampleUseCases":[{"title":"Best rate for WETH to USDC","prompt":"I want to swap 2 WETH for USDC on Base — what's the best rate I can get right now, and which DEXs will the route go through?"},{"title":"Cheapest ETH to DAI swap","prompt":"How much DAI would I get if I swapped 0.5 ETH on Base today? Find me the cheapest route and let me know if there's any significant price impact."},{"title":"USDC to WETH reverse quote","prompt":"I have 500 USDC and want to swap it to WETH on Base — what's the optimal route and how much WETH should I expect to receive?"}],"resultDescription":"Returns the optimal swap route for the specified token pair and amount on Base chain, including expected output amount, price impact, and step-by-step EIP-712 signing instructions with code examples so the swap transaction can be broadcast on-chain.","failureModes":["Invalid or unsupported token address returns an error or empty route","Unsupported token pair with no liquidity returns no route found","Missing required parameters (tokenIn, tokenOut, amountIn) results in validation error","Extremely low or zero amount may produce no viable route","Network or liquidity provider downtime causes timeout or empty response"],"whenToPreferThis":"Use this endpoint when you need an optimized swap quote specifically on the Base chain with 0x Permit2 integration, including actionable signing instructions. Prefer this over generic DEX interfaces when you need end-to-end swap execution guidance including EIP-712 data, or when operating on Base and needing the best aggregated route across Base DEXs.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T19:28:40.037Z","isFirstParty":false}