{"uid":"cap_4bV_LrBFha0jjVg7BzqCh","slug":"silverback-x402-onrender-com-d1e2ee4f","name":"Silverback 0x Permit2 Token Swap","description":"Handles paid token swaps across EVM and Solana networks, accepting exact-amount payments (e.g., USDC) with configurable timeouts.","url":"https://silverback-x402.onrender.com/api/v1/swap","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"tokenIn":{"type":"string","description":"Token to sell (symbol like USDC, WETH, VIRTUAL or 0x address)"},"amountIn":{"type":"string","description":"Amount to swap in human-readable units (e.g. '0.1' for 0.1 WETH)"},"slippage":{"type":"string","description":"Max slippage % (default: '1')"},"tokenOut":{"type":"string","description":"Token to buy (symbol or 0x address)"},"walletAddress":{"type":"string","description":"Your wallet address — you will sign the Permit2 data and submit the transaction"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.05","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":"$0.05/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.05","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_DE3m6ncPTTHZmNdfP8UpO","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.05","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns EIP-712 Permit2 signing data and step-by-step instructions to swap one token for another on Base chain via the 0x protocol","exampleAgentPrompt":"Swap 0.1 WETH for USDC on Base using my wallet 0xAbC...123, with a max slippage of 1%, and give me the Permit2 EIP-712 data I need to sign and broadcast.","exampleUseCases":null,"resultDescription":"Returns step-by-step instructions including EIP-712 data to sign via Permit2, how to append the signature to the transaction, and how to broadcast it — plus code examples for executing the swap on Base chain via 0x.","failureModes":["Invalid token symbol or address returns error identifying unrecognized token","Unsupported token pair with no liquidity returns routing failure","Invalid wallet address format causes validation error","Amount too small or too large may fall outside supported swap range","Slippage value out of acceptable range returns parameter error","Network congestion or 0x API downtime causes timeout or 503"],"whenToPreferThis":"Choose this endpoint when you need to swap ERC-20 tokens on Base chain using the 0x Permit2 flow (EIP-712 sign-and-broadcast pattern). Prefer it over Jupiter-based endpoints (which are for Solana). Use it when the agent needs to construct a signable swap transaction with slippage control rather than just getting a price quote.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-16T07:28:43.746Z","isFirstParty":false}