{"id":"c5fd7bba-ee35-457d-bcf0-08c78de42d09","shortId":"WB2XJn","kind":"x402","title":"Portfolio performance data via x402 micropayment on Base network, $0.02 per request.","tagline":"Portfolio performance data via x402 micropayment on Base network, $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns portfolio performance data for a given portfolio ID (in this case, portfolio 100). It is part of a broader suite of x402-enabled APIs offered by the provider, 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.\n\nThe specific endpoint `/api/v1/portfolios/100/performance` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The provider's landing page confirms a flat $0.02/request pricing model across all endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what fields the portfolio performance response contains. The endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what request body parameters are expected or what shape the response takes.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-performance","micropayment","pay-per-request","json-api"],"categories":["finance"],"synonyms":["portfolio analytics","investment performance","portfolio returns","portfolio tracking","financial performance API","x402 finance API"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","Unknown request body format — no examples or field descriptions provided","Portfolio ID '100' is hardcoded in the URL; unclear if other portfolio IDs are supported or how they are obtained"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/100/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/100/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 challenge with clear pricing. However, there is no OpenAPI schema, no documentation, no request/response examples, and no description of what the portfolio performance endpoint actually returns. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':132 '0.02':10,22,116,131 '000':105 '0x8335':110 '100':42 '20':104 '2913':111 '402':198 '6':121 'accept':90 'across':135 'advertis':99 'ai/ml':62 'analyt':61 'api':54,140,156 'base':8,20,84,106,113 'bodi':208 'broader':48 'case':40 'challeng':98,199 'commit':148 'confirm':128 'connect':165 'contain':190 'content':171 'cost':102 'crypto':65 'data':3,15,32,60 'decim':122 'descript':182 'doc':155 'document':150,202 'enabl':53 'endpoint':26,70,88,137,192 'equal':115 'exampl':179 'expect':211 'extrem':152 'field':185 'financ':64 'financial performance API' 'flat':130 'given':35 'id':37 'infer':63 'investment performance' 'json':95 'json-api' 'key':141 'land':126 'limit':144 'live':194 'lowpaymentfee.com':28 'maximum':101 'micropay':6,18 'micropayment' 'minimum':147 'model':134 'network':9,21,85 'offer':55 'openapi':175 'page':127,160 'paramet':209 'part':45 'pay-per-request' 'payment':77 'per':11,23,117 'perform':2,14,31,188 'platform':73 'portfolio':1,13,30,36,41,187 'portfolio analytics' 'portfolio returns' 'portfolio tracking' 'portfolio-performance' 'post':91 'price':133,157 'prompt':167 'proper':197 'protocol':78 'provid':58,124 'rate':143 'readm':159 'render':162 'request':12,24,92,118,207 'request/response':178 'requir':149 'respons':189,216 'return':29,94,195 'schema':176 'servic':68 'settl':79 'shape':214 'span':59 'spars':153 'specif':87 'substant':170 'suit':49 'take':217 'unclear':205 'unit':107 'usdc':81,109,119 'usdc-base' 'use':74,120 'util':67 'via':4,16 'wallet':166 'without':201 'x402':5,17,52,76,97 'x402 finance API' 'x402-enabled':51 'x402-payment'","prices":[{"id":"76db7a77-fca3-4e95-b7bd-e1f59e70a3c4","listingId":"c5fd7bba-ee35-457d-bcf0-08c78de42d09","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/100/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":"2026-04-18T18:52:21.881Z"}],"sources":[{"listingId":"c5fd7bba-ee35-457d-bcf0-08c78de42d09","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/100/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:21.881Z","lastSeenAt":"2026-04-28T18:34:28.761Z"}],"details":{"listingId":"c5fd7bba-ee35-457d-bcf0-08c78de42d09","quickStartSnippet":"# Requires an x402-compatible client that can settle USDC on Base\ncurl -X POST https://lowpaymentfee.com/api/v1/portfolios/100/performance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_header>\"","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/100/performance"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/100/performance"}],"useCases":["Retrieving performance metrics for a specific investment portfolio","Integrating portfolio performance data into dashboards or agent workflows","Programmatic access to portfolio analytics without API key management"],"bestFor":["Agents or apps needing on-demand portfolio performance data with no signup","Developers wanting x402 pay-per-call finance endpoints on Base","Micropayment-based access to financial data without subscriptions"],"notFor":["Users needing detailed API documentation or request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone requiring non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.488Z"},"updatedAt":"2026-04-28T18:34:28.761Z"}}