{"id":"381e1ad2-adb8-4bbe-b326-4512bd99fdcf","shortId":"6dUyUm","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 provides portfolio performance data for a specific portfolio (ID 17) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals).\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers dozens of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced uniformly at $0.02 per call. The platform advertises no API keys, no rate limits, and instant access; callers simply attach an x402 payment header to each request.\n\nDocumentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned 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 specific portfolio (ID 17) is not described anywhere on the site. Consequently, the exact input parameters and output shape are unknown.","tags":[],"capabilities":["x402-payment","portfolio-performance","usdc-base-network","micropayment","json-api","post-method"],"categories":["finance"],"synonyms":["portfolio analytics","investment performance","portfolio returns","portfolio tracking","financial performance API","x402 finance"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all return only a wallet-connect prompt with no content.","No OpenAPI or output schema provided; request parameters and response shape are entirely unknown.","The specific portfolio ID (17) is not described anywhere; unclear what portfolio this represents.","No request or response examples available from any source."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/17/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/17/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 (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs. The purpose of 'portfolio 17' is unexplained. This is effectively a stub 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'/docs':138 '/pricing':140 '/readme':142 '0.02':10,22,66,107 '000':70 '0x8335':60 '17':38,178 '20':69 '2913':61 '6':74 'accept':44 'access':121 'advertis':112 'ai/ml':96 'analyt':95 'anywher':182 'api':92,114 'attach':124 'base':8,20,55,71 'behind':39 'broader':82 'call':109 'caller':122 'connect':148 'consequ':186 'contain':173 'content':154 'contract':59 'cost':64 'crawl':137 'data':3,15,32,94,99 'decim':75 'describ':181 'descript':165 'document':132 'dozen':87 'endpoint':26,77 'exact':188 'exampl':162 'extrem':134 'field':168 'finance/web3':98 'financial performance API' 'gate':91 'header':128 'id':37,177 'infer':97 'input':189 'instant':120 'investment performance' 'json':49 'json-api' 'key':115 'limit':118 'lowpaymentfee.com':28,84 'micropay':6,18 'micropayment' 'network':9,21,56 'offer':86 'openapi':158 'output':192 'page':143 'paramet':190 'part':79 'payment':50,127 'paywal':42 'per':11,23,67,108 'perform':2,14,31,171 'platform':83,111 'portfolio':1,13,30,36,170,176 'portfolio analytics' 'portfolio returns' 'portfolio tracking' 'portfolio-performance' 'post':45 'post-method' 'price':104 'prompt':150 'provid':29 'rate':117 'request':12,24,46,68,131 'request/response':161 'respons':172 'return':48,145 'schema':159 'servic':102 'settl':52 'shape':193 'simpli':123 'site':185 'span':93 'spars':135 'specif':35,175 'substant':153 'uniform':105 'unit':72 'unknown':195 'usdc':58 'usdc-base-network' 'use':57 'util':101 'via':4,16 'wallet':149 'x402':5,17,41,90,126 'x402 finance' 'x402-gated':89 'x402-payment'","prices":[{"id":"1f763be6-caeb-44ef-944f-714b0d395fd4","listingId":"381e1ad2-adb8-4bbe-b326-4512bd99fdcf","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/17/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":"2026-04-18T18:52:23.104Z"}],"sources":[{"listingId":"381e1ad2-adb8-4bbe-b326-4512bd99fdcf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/17/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:23.104Z","lastSeenAt":"2026-04-28T17:35:16.182Z"}],"details":{"listingId":"381e1ad2-adb8-4bbe-b326-4512bd99fdcf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/17/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":"Endpoint returns HTTP 402 with x402 challenge advertising USDC on Base network at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/portfolios/17/performance"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/17/performance"}],"useCases":["Retrieving performance metrics for a tracked portfolio","Integrating portfolio performance data into dashboards or agents","Paying per-request for financial data without API key management"],"bestFor":["Agents or apps that need on-demand portfolio performance data with no subscription","Developers who prefer crypto micropayments over traditional API key auth","Quick, low-commitment access to financial performance endpoints"],"notFor":["Users who need detailed documentation or schema guarantees before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone needing portfolio performance for arbitrary portfolio IDs (only ID 17 is exposed at this URL)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.385Z"},"updatedAt":"2026-04-28T17:35:16.182Z"}}