{"id":"890c355b-9aa7-423c-a8b6-7813573d5388","shortId":"LPk65q","kind":"x402","title":"Portfolio performance data via x402 micropayment on Base network, $0.02/request.","tagline":"Portfolio performance data via x402 micropayment on Base network, $0.02/request.","description":"This endpoint at lowpaymentfee.com returns portfolio performance data for portfolio ID 65. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories, all settled via the x402 protocol on the Base network using USDC.\n\nThe endpoint is live and returns a 402 challenge requesting payment of up to 20,000 base units of USDC (0.02 USD) per request. Payment is made via the x402 \"exact\" scheme to a specified wallet address. The response MIME type is application/json. The endpoint accepts POST requests and requires no API keys or account registration — access is granted purely through on-chain micropayment.\n\nThe specific endpoint `/api/v1/portfolios/65/performance` is not listed on the site's main landing page among the advertised API categories, which focus on analytics, AI, finance, and utility endpoints. This suggests it may be a less-documented or specialized route. No OpenAPI schema, detailed documentation, or example responses were found in the crawl. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["portfolio-performance","x402-payment","usdc-micropayment","base-network","pay-per-request","json-response"],"categories":["finance","data"],"synonyms":["portfolio performance API","investment performance data","portfolio returns","x402 finance API","micropayment portfolio API","lowpaymentfee API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","This specific endpoint (/api/v1/portfolios/65/performance) is not listed among the site's advertised APIs — it may be undocumented or experimental","All documentation pages (docs, API, pricing, README) returned only a 'Connect wallet' prompt with no usable content","Response format and fields are unknown — no example responses found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/65/performance","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/portfolios/65/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no OpenAPI schema, no example responses, and no documentation beyond a wallet-connect prompt. The specific portfolio endpoint is not listed among the site's advertised APIs, making its purpose and response format unclear. Pricing is inferrable from the challenge but everything else must be 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'/request':11,22 '0.02':10,21,88 '000':83 '20':82 '402':75 '65':34 'accept':113 'access':124 'account':122 'across':48 'address':104 'advertis':149 'ai':156 'ai/ml':51 'among':147 'analyt':50,155 'api':47,119,150,188 'application/json':110 'base':8,19,64,84 'base-network' 'broader':40 'categori':55,151 'chain':131 'challeng':76 'connect':197 'content':203 'crawl':185 'data':3,14,30,49 'detail':176 'doc':187 'document':169,177 'endpoint':24,69,112,135,160 'exact':98 'exampl':179 'financ':157 'finance/web3':52 'focus':153 'found':182 'grant':126 'id':33 'infrastructur':54 'investment performance data' 'json-response' 'key':120 'land':145 'less':168 'less-docu':167 'list':139 'live':71 'lowpaymentfee API' 'lowpaymentfee.com':26 'made':94 'main':144 'may':164 'micropay':6,17,132 'micropayment portfolio API' 'mime':107 'network':9,20,65 'offer':42 'on-chain':129 'openapi':174 'page':146,192 'part':37 'pay':44 'pay-per-request':43 'payment':78,92 'per':45,90 'perform':2,13,29 'platform':41 'portfolio':1,12,28,32 'portfolio performance API' 'portfolio returns' 'portfolio-performance' 'post':114 'price':189 'prompt':199 'protocol':61 'pure':127 'readm':191 'registr':123 'request':46,77,91,115 'requir':117 'respons':106,180 'return':27,73,194 'rout':172 'schema':175 'scheme':99 'settl':57 'site':142 'special':171 'specif':134 'specifi':102 'substant':202 'suggest':162 'type':108 'unit':85 'usd':89 'usdc':67,87 'usdc-micropayment' 'use':66 'util':159 'via':4,15,58,95 'wallet':103,198 'x402':5,16,60,97 'x402 finance API' 'x402-payment'","prices":[{"id":"3b13c430-cf36-4d70-8b69-e00829b45d05","listingId":"890c355b-9aa7-423c-a8b6-7813573d5388","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/portfolios/65/performance","description":"Premium API 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application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/65/performance"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/65/performance"}],"useCases":["Retrieving performance metrics for a specific investment portfolio","Integrating portfolio performance data into automated trading or reporting agents","Paying per-request for financial data without API key management"],"bestFor":["Agents needing on-demand portfolio performance data with no subscription","Developers building x402-native financial dashboards","Automated systems that pay per API call via USDC on Base"],"notFor":["Users needing bulk historical portfolio data exports at scale","Anyone without a Base-network USDC wallet","Use cases requiring detailed API documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.82Z"},"updatedAt":"2026-04-27T18:36:24.476Z"}}