{"id":"40f22bc9-2273-49cc-ae2c-8c47df0b5b85","shortId":"5grsN7","kind":"x402","title":"Get optimal DEX swap quotes with price impact analysis on Base via x402 micropayments for $0.01/call.","tagline":"Get optimal DEX swap quotes with price impact analysis on Base via x402 micropayments for $0.01/call.","description":"The Silverback swap-quote endpoint returns optimal swap routing and price impact analysis for token pairs on Base (chain ID 8453). It is a read-only quote endpoint — it does not execute trades. You supply an input token, output token, and amount in human-readable units, and receive the expected output amount, price impact, fees, and route information.\n\nThis endpoint is part of the Silverback x402 DeFi Intelligence API, which offers 11 pay-per-use endpoints covering swap execution, technical analysis, yield intelligence, arbitrage scanning, token audits, whale tracking, wallet portfolios, pool analysis, holder analytics, and Jupiter (Solana) quotes. All endpoints use the x402 micropayment protocol: an initial request returns a 402 Payment Required challenge, you sign a USDC authorization (on Base, Solana, or SKALE), and resend with the payment proof header to receive the JSON response.\n\nThe swap-quote endpoint is priced at $0.01 per call (the lowest tier). Tokens can be specified by symbol (e.g. \"WETH\", \"USDC\") or by 0x contract address. The response includes fields for amountOut, priceImpact, fee, and route. The API defaults to Base (chain 8453) and all responses include a `success` boolean field.","tags":[],"capabilities":["swap-quote","price-impact-analysis","dex-routing","x402-micropayment","base-chain","evm-token-lookup","read-only-quote"],"categories":["defi","crypto"],"synonyms":["token swap quote","DEX quote","price impact","swap routing","Base swap","DeFi quote API","token exchange rate","AMM quote","Silverback swap"],"warnings":["The /docs URL returns 'Cannot GET /docs' — external documentation site (docs.silverbackdefi.app) may be the correct link but was not crawled.","The x402 challenge object captured in the probe was empty ({}), so exact payment asset/network details come only from the OpenAPI spec, not from a live 402 header.","No example response schema is provided; the response shape (amountOut, priceImpact, fee, route) is inferred from the OpenAPI description string only."],"endpointUrl":"https://x402.silverbackdefi.app/api/v1/swap-quote","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0xD34411a70EffbDd000c529bbF572082ffDcF1794","amount":"10000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300},{"asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","extra":{"feePayer":"8wLKe8H59eni5DmERU27GiRHGnN9fogRoq9yNqyKKNJA"},"payTo":"4HVvnhyXTkMnPbMBo9r3kfvYhzW4JSbLGdXg9SkUcVSe","amount":"10000","scheme":"exact","network":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","maxTimeoutSeconds":300},{"asset":"0x85889c8c714505E0c94b30fcfcF64fE3Ac8FCb20","extra":{"name":"USD Coin","version":"1"},"payTo":"0xD34411a70EffbDd000c529bbF572082ffDcF1794","amount":"10000","scheme":"exact","network":"eip155:1187947933","maxTimeoutSeconds":300}]},"qualityScore":"0.720","qualityRationale":"Full OpenAPI schema with clear field descriptions and pricing is available. The endpoint is live (402 challenge captured). However, no example response body is documented, the /docs path returns 404, and the 402 challenge object was empty so exact payment parameters (asset address, network, amount in base units) are not directly confirmed from the 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'0.01':16,33,184 '0x':201 '11':109 '402':150 '8453':56,220 'AMM quote' 'Base swap' 'DEX quote' 'DeFi quote API' 'Silverback swap' 'address':203 'amount':78,89 'amountout':209 'analysi':9,26,48,119,131 'analyt':133 'api':106,215 'arbitrag':122 'audit':125 'author':158 'base':11,28,53,160,218 'base-chain' 'boolean':227 'call':186 'chain':54,219 'challeng':153 'contract':202 'cover':115 'default':216 'defi':104 'dex':3,20 'dex-routing' 'e.g':196 'endpoint':40,64,97,114,139,180 'evm-token-lookup' 'execut':68,117 'expect':87 'fee':92,211 'field':207,228 'get':1,18 'header':170 'holder':132 'human':81 'human-read':80 'id':55 'impact':8,25,47,91 'includ':206,224 'inform':95 'initi':146 'input':73 'intellig':105,121 'json':174 'jupit':135 'lowest':188 'micropay':14,31,143 'offer':108 'optim':2,19,42 'output':75,88 'pair':51 'part':99 'pay':111 'pay-per-us':110 'payment':151,168 'per':112,185 'pool':130 'portfolio':129 'price':7,24,46,90,182 'price impact' 'price-impact-analysis' 'priceimpact':210 'proof':169 'protocol':144 'quot':5,22,39,63,137,179 'read':61 'read-on':60 'read-only-quote' 'readabl':82 'receiv':85,172 'request':147 'requir':152 'resend':165 'respons':175,205,223 'return':41,148 'rout':44,94,213 'scan':123 'sign':155 'silverback':36,102 'skale':163 'solana':136,161 'specifi':193 'success':226 'suppli':71 'swap':4,21,38,43,116,178 'swap routing' 'swap-quot':37,177 'swap-quote' 'symbol':195 'technic':118 'tier':189 'token':50,74,76,124,190 'token exchange rate' 'token swap quote' 'track':127 'trade':69 'unit':83 'usdc':157,198 'use':113,140 'via':12,29 'wallet':128 'weth':197 'whale':126 'x402':13,30,103,142 'x402-micropayment' 'yield':120","prices":[{"id":"d1ede2fe-82dd-472e-bb23-cf7d67680bcb","listingId":"40f22bc9-2273-49cc-ae2c-8c47df0b5b85","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":null,"chain":"base","payTo":"0xD34411a70EffbDd000c529bbF572082ffDcF1794","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0xD34411a70EffbDd000c529bbF572082ffDcF1794","amount":"10000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300},{"asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","extra":{"feePayer":"8wLKe8H59eni5DmERU27GiRHGnN9fogRoq9yNqyKKNJA"},"payTo":"4HVvnhyXTkMnPbMBo9r3kfvYhzW4JSbLGdXg9SkUcVSe","amount":"10000","scheme":"exact","network":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","maxTimeoutSeconds":300},{"asset":"0x85889c8c714505E0c94b30fcfcF64fE3Ac8FCb20","extra":{"name":"USD Coin","version":"1"},"payTo":"0xD34411a70EffbDd000c529bbF572082ffDcF1794","amount":"10000","scheme":"exact","network":"eip155:1187947933","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:33.958Z"}],"sources":[{"listingId":"40f22bc9-2273-49cc-ae2c-8c47df0b5b85","source":"x402_bazaar","sourceId":"https://x402.silverbackdefi.app/api/v1/swap-quote","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:33.958Z","lastSeenAt":"2026-04-22T04:02:49.210Z"}],"details":{"listingId":"40f22bc9-2273-49cc-ae2c-8c47df0b5b85","quickStartSnippet":"curl -X POST https://x402.silverbackdefi.app/api/v1/swap-quote \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"tokenIn\": \"WETH\", \"tokenOut\": \"USDC\", \"amountIn\": \"1.0\"}'","exampleRequest":{"tokenIn":"WETH","amountIn":"1.0","tokenOut":"USDC"},"exampleResponse":null,"schema":null,"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The swap-quote endpoint is priced at $0.01 per call.","source_url":"https://x402.silverbackdefi.app"},{"claim":"Endpoint returns quote with amountOut, priceImpact, fee, route and does not execute trades.","source_url":"https://x402.silverbackdefi.app"},{"claim":"Silverback provides 11 pay-per-use endpoints via x402 micropayments with USDC on Base, Solana, and SKALE.","source_url":"https://x402.silverbackdefi.app"},{"claim":"Token identifiers can be symbols (WETH, USDC) or 0x contract addresses; chain defaults to Base (8453).","source_url":"https://x402.silverbackdefi.app"},{"claim":"All responses include a success boolean field.","source_url":"https://x402.silverbackdefi.app"}],"useCases":["Agents comparing swap rates before executing a trade on Base","Bots monitoring price impact for large token swaps","Portfolio rebalancing tools that need real-time quote data before committing","DeFi dashboards displaying expected output amounts for user-specified swaps","Automated trading strategies that evaluate slippage before execution"],"bestFor":["AI agents needing on-demand DEX swap quotes without subscriptions","Developers building non-custodial DeFi tools on Base","Low-cost per-call pricing for lightweight quote lookups"],"notFor":["Executing actual token swaps (use the /api/v1/swap endpoint instead)","Solana DEX quotes (use the /api/v1/jupiter-quote endpoint instead)","High-frequency trading requiring sub-second latency with no per-call cost"],"kindDetails":{},"updatedAt":"2026-04-22T01:09:47.062Z"}}