{"id":"2606a6f8-e8de-406b-9fdc-d273dccc5665","shortId":"FKme8q","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 portfolio ID 54. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance, and infrastructure categories. The endpoint uses the x402 payment protocol, settling in USDC on the Base network at $0.02 per call (maxAmountRequired of 20,000 base units with 6 decimals = $0.02). No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific endpoint path (`/api/v1/portfolios/54/performance`) suggests it returns performance metrics for a particular portfolio — likely time-series returns, gains/losses, or similar financial analytics. However, no response schema or example output is documented in the crawled material. The endpoint accepts POST requests and returns application/json. The x402 challenge was successfully captured, confirming the endpoint is live.\n\nThe provider's landing page lists a wide catalog of endpoints (analytics, AI, finance, crypto, utilities) all priced at $0.02 per request. Documentation pages beyond the landing page returned only a \"Connect wallet\" prompt with no substantive content, so details about request parameters, response format, and portfolio data semantics remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","portfolio-performance","pay-per-request","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["portfolio analytics","investment performance","portfolio returns","financial performance API","portfolio tracking","x402 finance endpoint"],"warnings":["No documentation available — all doc pages return only a 'Connect wallet' prompt with no content","No request parameters or response schema documented; endpoint behavior must be discovered empirically","The specific portfolio ID (54) is hardcoded in the path — unclear if other portfolio IDs are available or how they are obtained","Provider site appears to be a generic x402 API storefront; the actual data sources and reliability are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/54/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/54/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and documentation pages are empty stubs. The endpoint path implies portfolio performance data but specifics are entirely 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'0.02':10,22,73,85,183 '000':79 '20':78 '54':36 '6':83 'accept':147 'across':50 'ai':176 'ai/ml':53 'analyt':52,131,175 'api':49,87 'application/json':152 'attach':96 'base':8,20,70,80 'beyond':188 'broader':42 'call':75 'caller':94 'captur':158 'catalog':172 'categori':57 'challeng':155 'confirm':159 'connect':195 'content':201 'crawl':143 'crypto':178 'data':3,15,32,51,211 'decim':84 'detail':203 'document':140,186 'endpoint':26,59,110,146,161,174 'exampl':137 'financ':54,177 'financi':130 'financial performance API' 'format':208 'gains/losses':127 'header':101 'howev':132 'id':35 'infrastructur':56 'investment performance' 'json-response' 'key':88 'land':167,190 'like':122 'limit':91 'list':169 'live':163 'lowpaymentfee.com':28 'materi':144 'maxamountrequir':76 'metric':117 'micropay':6,18 'network':9,21,71 'no-api-key' 'offer':44 'output':138 'page':168,187,191 'paramet':206 'part':39 'particular':120 'path':111 'pay':46 'pay-per-request':45 'payment':63,100,106 'per':11,23,47,74,184 'perform':2,14,31,116 'platform':43 'portfolio':1,13,30,34,121,210 'portfolio analytics' 'portfolio returns' 'portfolio tracking' 'portfolio-performance' 'post':148 'price':181 'prompt':197 'proof':107 'protocol':64 'provid':165 'rate':90 'remain':213 'request':12,24,48,149,185,205 'requir':93 'respons':134,207 'return':29,115,126,151,192 'schema':135 'semant':212 'seri':125 'settl':65 'similar':129 'simpli':95 'specif':109 'substant':200 'success':157 'suggest':113 'time':124 'time-seri':123 'unit':81 'unknown':214 'usdc':67 'usdc-base-network' 'use':60 'util':179 'valid':104 'via':4,16 'wallet':196 'wide':171 'x':99 'x-payment':98 'x402':5,17,62,105,154 'x402 finance endpoint' 'x402-payment'","prices":[{"id":"14f09702-cf87-4f3d-9ff7-5a93c89f30c5","listingId":"2606a6f8-e8de-406b-9fdc-d273dccc5665","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/54/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":"2026-04-18T18:53:10.939Z"}],"sources":[{"listingId":"2606a6f8-e8de-406b-9fdc-d273dccc5665","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/54/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:10.939Z","lastSeenAt":"2026-04-27T20:08:58.436Z"}],"details":{"listingId":"2606a6f8-e8de-406b-9fdc-d273dccc5665","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/54/performance \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","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, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/portfolios/54/performance"},{"claim":"maxAmountRequired is 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/54/performance"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/54/performance"}],"useCases":["Retrieving performance metrics for a specific investment portfolio","Integrating portfolio performance data into dashboards or reporting tools","Agent-driven financial analysis workflows that pay per query"],"bestFor":["Developers needing on-demand portfolio performance data without subscriptions","AI agents that can settle x402 micropayments on Base","Applications requiring low-cost, keyless access to financial data"],"notFor":["Users who need bulk historical portfolio data at scale (no documented batch endpoint)","Anyone without a Base-compatible USDC wallet for x402 payments","Use cases requiring detailed documentation or guaranteed SLAs (docs are sparse)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.037Z"},"updatedAt":"2026-04-27T20:08:58.436Z"}}