{"id":"c56e05da-e0f1-443a-92dc-cb30b980a0db","shortId":"UgpWyz","kind":"x402","title":"Portfolio performance data via x402 micropayment on Base network, $0.02/request in USDC.","tagline":"Portfolio performance data via x402 micropayment on Base network, $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com returns portfolio performance data for portfolio ID 6. It is part of a broader platform offering various pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network at $0.02 per request.\n\nThe specific endpoint `/api/v1/portfolios/6/performance` is categorized under the platform's premium API access tier. It accepts POST requests and returns JSON. The x402 challenge confirms the endpoint is live, requiring a maximum payment of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to the payTo address on Base. No API keys or rate limits are advertised — access is gated purely by micropayment.\n\nDocumentation is extremely sparse. The platform's docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the portfolio performance response contains. The endpoint path suggests it returns performance metrics for a specific portfolio (ID 6), but the exact schema and semantics are unknown.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","portfolio-performance","pay-per-request","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["portfolio performance API","investment performance","portfolio analytics","x402 finance API","micropayment API","USDC pay-per-call","lowpaymentfee"],"warnings":["No documentation available — all doc/pricing/API pages render only 'Connect wallet' with no content","No request or response schema provided; the actual data returned is unknown","Endpoint is hardcoded to portfolio ID 6 with no explanation of what this portfolio represents","No OpenAPI or machine-readable schema discovered"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/6/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/6/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation on request parameters, response schema, or what 'portfolio 6 performance' actually returns. Docs pages are empty. No OpenAPI spec or examples exist. This is effectively a stub 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'/request':11,24 '0.02':10,23,81,124 '000':119 '20':118 '6':38,129,207 'USDC pay-per-call' 'accept':99 'access':96,145 'address':134 'advertis':144 'ai/ml':56 'analyt':55 'api':52,95,138,160 'base':8,21,78,120,136 'base-network' 'broader':44 'categor':89 'challeng':107 'confirm':108 'connect':168 'contain':193 'content':174 'crypto':59 'data':3,16,34,54 'decim':130 'descript':185 'doc':158 'document':151 'endpoint':28,64,86,110,195 'exact':210 'exampl':182 'extrem':153 'field':188 'financ':58 'gate':147 'id':37,206 'infer':57 'investment performance' 'json':104 'json-response' 'key':139 'limit':142 'live':112 'lowpaymentfee' 'lowpaymentfee.com':30 'maximum':115 'metric':201 'micropay':6,19,150 'micropayment API' 'network':9,22,79 'no-api-key' 'offer':46 'openapi':178 'page':163 'part':41 'path':196 'pay':49 'pay-per-request':48 'payment':71,116 'payto':133 'per':50,82 'perform':2,15,33,191,200 'platform':45,67,92,156 'portfolio':1,14,32,36,190,205 'portfolio analytics' 'portfolio performance API' 'portfolio-performance' 'post':100 'premium':94 'price':159 'prompt':170 'protocol':72 'pure':148 'rate':141 'readm':162 'render':165 'request':51,83,101 'request/response':181 'requir':113 'respons':192 'return':31,103,199 'schema':179,211 'semant':213 'servic':62 'settl':73 'sinc':126 'span':53 'spars':154 'specif':85,204 'suggest':197 'tier':97 'unit':121 'unknown':215 'usd':125 'usdc':13,26,75,123,127 'usdc-micropayment' 'use':68,128 'util':61 'various':47 'via':4,17 'wallet':169 'x402':5,18,70,106 'x402 finance API' 'x402-payment'","prices":[{"id":"e620d7e7-5e2c-44ed-8d75-ab8b48a46e17","listingId":"c56e05da-e0f1-443a-92dc-cb30b980a0db","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/6/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:03.163Z"}],"sources":[{"listingId":"c56e05da-e0f1-443a-92dc-cb30b980a0db","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/6/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:03.163Z","lastSeenAt":"2026-04-27T21:34:10.056Z"}],"details":{"listingId":"c56e05da-e0f1-443a-92dc-cb30b980a0db","quickStartSnippet":"# The endpoint requires an x402 payment header (USDC on Base, $0.02).\n# Use an x402-compatible client to handle payment automatically.\ncurl -X POST https://lowpaymentfee.com/api/v1/portfolios/6/performance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"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":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/6/performance"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving performance metrics for a specific investment portfolio","Integrating portfolio performance data into dashboards or agent workflows","Paying per-request for financial data without subscription commitments"],"bestFor":["Agents or apps needing on-demand portfolio performance data with no signup","Developers exploring x402 micropayment-gated APIs on Base","Low-volume consumers who prefer pay-per-call over subscriptions"],"notFor":["Users needing detailed API documentation or response schema before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring portfolio data for arbitrary portfolio IDs (this endpoint is hardcoded to portfolio 6)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.484Z"},"updatedAt":"2026-04-27T21:34:10.056Z"}}