{"id":"3a9dcce6-4526-4ab9-86d8-6ad41ed566e4","shortId":"B9yHx8","kind":"x402","title":"Pay-per-use DeFi intelligence API: swap quotes, yield analysis, whale tracking, and more via x402 micropayments.","tagline":"Pay-per-use DeFi intelligence API: swap quotes, yield analysis, whale tracking, and more via x402 micropayments.","description":"Silverback is a DeFi intelligence API suite offering 11 pay-per-use endpoints accessible via the x402 micropayment protocol. It covers a broad range of DeFi operations and analytics on Base and Solana, including token swaps (via Permit2), swap quotes, Jupiter DEX quotes (Solana), technical analysis (RSI, MACD, Bollinger Bands), DeFi yield opportunities, cross-DEX arbitrage scanning, token security audits, whale transaction tracking, wallet portfolio lookups, liquidity pool analysis, and token holder analytics.\n\nPayments are settled in USDC on Base, Solana, or SKALE (zero gas). Pricing ranges from $0.01 per call for lighter analytics (pool analysis, swap quotes, holder analytics) up to $0.05 for execution endpoints (swap). A 15% discount is available when paying with the $BACK token via Permit2 on Base. All responses return JSON with a `success` boolean field. Token identifiers use CoinGecko IDs for market data or 0x contract addresses for on-chain endpoints, with Base (chain ID 8453) as the default chain.\n\nNote: The specific `/api/v1/dex-metrics` endpoint listed here returned 404 on both GET and POST during probing, suggesting it may not be a currently active endpoint or may have been renamed/removed. However, the broader Silverback API platform is live (root returns 200) and the OpenAPI spec documents 11 other working endpoints. The external docs link (docs.silverbackdefi.app) was not reachable during crawl.","tags":[],"capabilities":["token-swap","swap-quote","technical-analysis","defi-yield","arbitrage-scanning","token-audit","whale-tracking","wallet-portfolio","pool-analysis","holder-analytics","jupiter-dex-quote","x402-micropayments","permit2-signing"],"categories":["defi","crypto","finance"],"synonyms":["DeFi API","crypto intelligence","swap routing","yield farming API","token audit","whale tracker","liquidity analysis","DEX aggregator","on-chain analytics","Base DeFi"],"warnings":["The /api/v1/dex-metrics endpoint returned 404 on both POST and GET — it may have been removed, renamed, or is not a valid endpoint.","The /api/v1/dex-metrics path is NOT listed in the OpenAPI spec; the spec documents 11 other endpoints but not this one.","External docs at docs.silverbackdefi.app were not reachable during crawl.","No example response data available for any endpoint."],"endpointUrl":"https://x402.silverbackdefi.app/api/v1/dex-metrics","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0xD34411a70EffbDd000c529bbF572082ffDcF1794","amount":"2000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300},{"asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","extra":{"feePayer":"8wLKe8H59eni5DmERU27GiRHGnN9fogRoq9yNqyKKNJA"},"payTo":"4HVvnhyXTkMnPbMBo9r3kfvYhzW4JSbLGdXg9SkUcVSe","amount":"2000","scheme":"exact","network":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","maxTimeoutSeconds":300},{"asset":"0x85889c8c714505E0c94b30fcfcF64fE3Ac8FCb20","extra":{"name":"USD Coin","version":"1"},"payTo":"0xD34411a70EffbDd000c529bbF572082ffDcF1794","amount":"2000","scheme":"exact","network":"eip155:1187947933","maxTimeoutSeconds":300},{"asset":"USDC","extra":{"symbol":"USDC","nodeUrl":"https://api.keeta.com","decimals":6,"serverAddress":"keeta_aabwgiqyij4scwktdoczzvhpi33btieeses5sezeqzqmpi5ik76ttyegwuvfsai","permissionSetupUrl":"/api/v1/keeta/setup-permission"},"payTo":"keeta_aabaolle2k3hceayy4vkyw7smgl35o5wbqeebt2fibyx5sxxodneqb2rmwqkjci","amount":"2000","scheme":"keeta-usdc","network":"keeta:main","expiresAt":1771370261402,"paymentId":"c35c4cc7-a27d-4ecb-b350-440c70b86743","amountHuman":"0.002000","description":"Base chain DEX ecosystem overview with volume, TVL, gas stats, and top pairs","tokenAddress":"keeta_amnkge74xitii5dsobstldatv3irmyimujfjotftx7plaaaseam4bntb7wnna","maxTimeoutSeconds":300,"requiresPermission":true}]},"qualityScore":"0.450","qualityRationale":"The specific /api/v1/dex-metrics endpoint returned 404 on both GET and POST, indicating it is not currently live or has been renamed. The broader Silverback platform is live with a detailed OpenAPI spec covering 11 other endpoints, but the external docs link failed and no example responses are available. Scoring reflects the non-responsive target endpoint despite good surrounding 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'0.01':127 '0.05':141 '0x':179 '11':45,242 '15':147 '200':236 '404':204 '8453':191 'Base DeFi' 'DEX aggregator' 'DeFi API' 'access':51 'activ':219 'address':181 'analysi':11,29,83,107,134 'analyt':66,111,132,138 'api':7,25,42,230 'arbitrag':94 'arbitrage-scanning' 'audit':98 'avail':150 'back':155 'band':87 'base':68,118,160,188 'bolling':86 'boolean':168 'broad':60 'broader':228 'call':129 'chain':185,189,195 'coingecko':173 'contract':180 'cover':58 'crawl':255 'cross':92 'cross-dex':91 'crypto intelligence' 'current':218 'data':177 'default':194 'defi':5,23,40,63,88 'defi-yield' 'dex':79,93 'discount':148 'doc':248 'docs.silverbackdefi.app':250 'document':241 'endpoint':50,144,186,200,220,245 'execut':143 'extern':247 'field':169 'gas':123 'get':207 'holder':110,137 'holder-analytics' 'howev':226 'id':174,190 'identifi':171 'includ':71 'intellig':6,24,41 'json':164 'jupit':78 'jupiter-dex-quote' 'lighter':131 'link':249 'liquid':105 'liquidity analysis' 'list':201 'live':233 'lookup':104 'macd':85 'market':176 'may':214,222 'micropay':18,36,55 'note':196 'offer':44 'on-chain':183 'on-chain analytics' 'openapi':239 'oper':64 'opportun':90 'pay':2,20,47,152 'pay-per-us':1,19,46 'payment':112 'per':3,21,48,128 'permit2':75,158 'permit2-signing' 'platform':231 'pool':106,133 'pool-analysis' 'portfolio':103 'post':209 'price':124 'probe':211 'protocol':56 'quot':9,27,77,80,136 'rang':61,125 'reachabl':253 'renamed/removed':225 'respons':162 'return':163,203,235 'root':234 'rsi':84 'scan':95 'secur':97 'settl':114 'silverback':37,229 'skale':121 'solana':70,81,119 'spec':240 'specif':198 'success':167 'suggest':212 'suit':43 'swap':8,26,73,76,135,145 'swap routing' 'swap-quote' 'technic':82 'technical-analysis' 'token':72,96,109,156,170 'token audit' 'token-audit' 'token-swap' 'track':13,31,101 'transact':100 'usdc':116 'use':4,22,49,172 'via':16,34,52,74,157 'wallet':102 'wallet-portfolio' 'whale':12,30,99 'whale tracker' 'whale-tracking' 'work':244 'x402':17,35,54 'x402-micropayments' 'yield':10,28,89 'yield farming API' 'zero':122","prices":[{"id":"cac9c44f-98ca-4436-9158-84502eecc038","listingId":"3a9dcce6-4526-4ab9-86d8-6ad41ed566e4","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":"2000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300},{"asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","extra":{"feePayer":"8wLKe8H59eni5DmERU27GiRHGnN9fogRoq9yNqyKKNJA"},"payTo":"4HVvnhyXTkMnPbMBo9r3kfvYhzW4JSbLGdXg9SkUcVSe","amount":"2000","scheme":"exact","network":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","maxTimeoutSeconds":300},{"asset":"0x85889c8c714505E0c94b30fcfcF64fE3Ac8FCb20","extra":{"name":"USD Coin","version":"1"},"payTo":"0xD34411a70EffbDd000c529bbF572082ffDcF1794","amount":"2000","scheme":"exact","network":"eip155:1187947933","maxTimeoutSeconds":300},{"asset":"USDC","extra":{"symbol":"USDC","nodeUrl":"https://api.keeta.com","decimals":6,"serverAddress":"keeta_aabwgiqyij4scwktdoczzvhpi33btieeses5sezeqzqmpi5ik76ttyegwuvfsai","permissionSetupUrl":"/api/v1/keeta/setup-permission"},"payTo":"keeta_aabaolle2k3hceayy4vkyw7smgl35o5wbqeebt2fibyx5sxxodneqb2rmwqkjci","amount":"2000","scheme":"keeta-usdc","network":"keeta:main","expiresAt":1771370261402,"paymentId":"c35c4cc7-a27d-4ecb-b350-440c70b86743","amountHuman":"0.002000","description":"Base chain DEX ecosystem overview with volume, TVL, gas stats, and top pairs","tokenAddress":"keeta_amnkge74xitii5dsobstldatv3irmyimujfjotftx7plaaaseam4bntb7wnna","maxTimeoutSeconds":300,"requiresPermission":true}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:34.044Z"}],"sources":[{"listingId":"3a9dcce6-4526-4ab9-86d8-6ad41ed566e4","source":"x402_bazaar","sourceId":"https://x402.silverbackdefi.app/api/v1/dex-metrics","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:34.044Z","lastSeenAt":"2026-04-22T04:02:49.332Z"}],"details":{"listingId":"3a9dcce6-4526-4ab9-86d8-6ad41ed566e4","quickStartSnippet":"# 1. Send request, receive 402 with payment challenge\ncurl -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\"}'\n\n# 2. Sign USDC payment via x402 protocol, then resend with payment proof header","exampleRequest":{"tokenIn":"WETH","amountIn":"1.0","tokenOut":"USDC"},"exampleResponse":null,"schema":null,"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"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":"Pricing tiers range from $0.01 (pool-analysis, swap-quote) to $0.05 (swap execution), with $BACK token offering 15% discount","source_url":"https://x402.silverbackdefi.app"},{"claim":"The /api/v1/dex-metrics endpoint returned 404 on both POST and GET","source_url":"https://x402.silverbackdefi.app/api/v1/dex-metrics"},{"claim":"OpenAPI spec documents endpoints including swap, technical-analysis, defi-yield, arbitrage-scanner, token-audit, whale-moves, wallet-portfolio, pool-analysis, swap-quote, jupiter-quote, and holder-analytics","source_url":"https://x402.silverbackdefi.app"}],"useCases":["AI agents autonomously executing or quoting token swaps on Base or Solana","Automated DeFi yield scanning with risk-adjusted portfolio allocation recommendations","Monitoring whale wallet movements and large transactions for trading signals","Running security audits on tokens before investing (honeypot detection, tax analysis)","Analyzing liquidity pool health, TVL, and APR for LP decision-making"],"bestFor":["Autonomous DeFi agents that need pay-per-call intelligence without subscriptions","Developers building trading bots on Base or Solana","Portfolio analysis tools needing on-chain wallet and token data","Security-conscious traders wanting automated token audits"],"notFor":["High-frequency trading requiring sub-second latency (micropayment overhead per call)","Non-crypto or traditional finance data needs","Users who need free or subscription-based access without per-call payments"],"kindDetails":{},"updatedAt":"2026-04-22T01:03:59.079Z"}}