{"id":"acc50a5e-f7a3-4190-abb6-14c5070f27e8","shortId":"bTUYYW","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 96. 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/96/performance` accepts POST requests and returns JSON. The x402 challenge confirms it is live, requiring a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. No API keys or rate limits are advertised; access is gated purely by the x402 payment header.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional 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 96), but the exact schema and semantics are unknown.","tags":[],"capabilities":["x402-payment","portfolio-performance","usdc-base-network","pay-per-request","json-api"],"categories":["finance"],"synonyms":["portfolio performance API","investment performance","portfolio returns","portfolio analytics","x402 finance API","micropayment API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for this endpoint","No request body or response body examples found anywhere in crawled content","Docs, API, pricing, and README pages all render only a 'Connect wallet' prompt with no useful content","The portfolio ID 96 is hardcoded in the path; it is unclear whether other portfolio IDs are available or what this portfolio represents"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/96/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/96/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no OpenAPI schema, no request/response examples, and no meaningful documentation beyond the landing page listing. The specific purpose of 'portfolio 96 performance' is opaque without further 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'/request':11,22 '0.02':10,21,77,107 '000':102 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':117 '20':101 '6':112 '96':34,190 'accept':84 'access':126 'addit':156 'address':116 'advertis':125 'ai/ml':52 'analyt':51 'api':48,119,142 'base':8,19,74,103 'broader':40 'challeng':92 'confirm':93 'connect':151 'contain':176 'content':157 'crawl':140 'crypto':55 'data':3,14,30,50 'decim':113 'descript':168 'doc':141 'document':135 'endpoint':24,60,82,178 'exact':193 'exampl':165 'extrem':137 'field':171 'financ':54 'gate':128 'header':134 'id':33,189 'infer':53 'investment performance' 'json':89 'json-api' 'key':120 'limit':123 'live':96 'lowpaymentfee' 'lowpaymentfee.com':26 'maximum':99 'metric':184 'micropay':6,17 'micropayment API' 'network':9,20,75 'offer':42 'openapi':161 'page':146 'paid':114 'part':37 'path':179 'pay':45 'pay-per-request':44 'payment':67,133 'per':46,78 'perform':2,13,29,174,183 'platform':41,63 'portfolio':1,12,28,32,173,188 'portfolio analytics' 'portfolio performance API' 'portfolio returns' 'portfolio-performance' 'post':85 'price':143 'prompt':153 'protocol':68 'pure':129 'rate':122 'readm':145 'request':47,79,86 'request/response':164 'requir':97 'respons':175 'return':27,88,148,182 'schema':162,194 'semant':196 'servic':58 'settl':69 'sinc':109 'span':49 'spars':138 'specif':81,187 'suggest':180 'unit':104 'unknown':198 'usd':108 'usdc':71,106,110 'usdc-base-network' 'use':64,111 'util':57 'various':43 'via':4,15 'wallet':152 'x402':5,16,66,91,132 'x402 finance API' 'x402-payment'","prices":[{"id":"8864f46f-da8a-4fa8-8c34-a38b8fe836d0","listingId":"acc50a5e-f7a3-4190-abb6-14c5070f27e8","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/96/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":"2026-04-18T18:53:45.896Z"}],"sources":[{"listingId":"acc50a5e-f7a3-4190-abb6-14c5070f27e8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/96/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:45.896Z","lastSeenAt":"2026-04-27T20:35:16.968Z"}],"details":{"listingId":"acc50a5e-f7a3-4190-abb6-14c5070f27e8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/96/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 endpoint returns a 402 x402 challenge requiring 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/96/performance"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/96/performance"}],"useCases":["Retrieving performance metrics for a specific investment portfolio","Integrating portfolio performance data into dashboards or analytics pipelines","Agent-driven portfolio monitoring with per-request micropayments"],"bestFor":["Developers needing on-demand portfolio performance data without API key management","AI agents that can settle x402 payments on Base for per-call access","Applications requiring low-cost, commitment-free financial data queries"],"notFor":["Users needing detailed API documentation or response schema guarantees before integrating","Bulk historical portfolio data retrieval (no batch endpoint documented)","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.419Z"},"updatedAt":"2026-04-27T20:35:16.968Z"}}