{"id":"b87fa019-c1be-490b-9da0-b0f431ff9120","shortId":"msepYV","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 51. It is part of a broader platform offering various pay-per-call APIs across data analytics, AI/ML, finance, and infrastructure categories, all settled via the x402 protocol on the Base network using USDC.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 exact payment scheme. The maximum amount required per call is 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 USD (USDC uses 6 decimals). There are no API keys, no rate limits, and no subscription commitments — each request is independently paid for at the time of the call.\n\nThe specific endpoint `/api/v1/portfolios/51/performance` is not listed on the site's main landing page among the advertised API categories, so it may be a specialized or less-documented route. No OpenAPI schema, detailed request/response documentation, or example payloads were found in the crawl. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no additional content. As a result, the exact request body format and response structure are unknown and must be discovered by the caller.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-performance","pay-per-request","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["portfolio performance API","investment performance","portfolio returns","x402 finance API","micropayment API","Base USDC API","portfolio analytics"],"warnings":["No OpenAPI or request/response schema available — callers must discover the expected POST body format","This specific endpoint (/api/v1/portfolios/51/performance) is not listed among the site's advertised APIs; it may be undocumented or experimental","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no substantive content","The hardcoded portfolio ID (51) in the URL suggests this may be a single-resource endpoint rather than a general-purpose portfolio API"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/51/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/51/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response documentation, no examples, and the specific portfolio endpoint is not listed on the site's landing page. Docs pages returned only wallet-connect prompts with no useful 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'0.02':10,22,113 '000':103 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':108 '20':102 '51':36 '6':117 'Base USDC API' 'accept':73 'across':51 'addit':202 'advertis':159 'ai/ml':54 'among':157 'amount':97 'analyt':53 'api':50,122,160,191 'base':8,20,67,104,110 'bodi':210 'broader':42 'call':49,100,142 'caller':223 'categori':58,161 'commit':130 'connect':197 'content':203 'crawl':186 'data':3,15,32,52 'decim':118 'detail':176 'discov':220 'doc':188 'document':171,178 'endpoint':26,72,145 'equal':112 'exact':92,208 'exampl':180 'financ':55 'format':211 'found':183 'handl':81 'header':88 'id':35 'independ':134 'infrastructur':57 'inlin':82 'investment performance' 'json':78 'json-response' 'key':123 'land':155 'less':170 'less-docu':169 'limit':126 'list':149 'lowpaymentfee.com':28 'main':154 'maximum':96 'may':164 'micropay':6,18 'micropayment API' 'must':218 'network':9,21,68 'no-api-key' 'offer':44 'openapi':174 'page':156,192 'paid':135 'part':39 'pay':47 'pay-per-cal':46 'pay-per-request' 'payload':181 'payment':79,87,93 'per':11,23,48,99 'perform':2,14,31 'platform':43 'portfolio':1,13,30,34 'portfolio analytics' 'portfolio performance API' 'portfolio returns' 'portfolio-performance' 'post':74 'price':189 'prompt':199 'protocol':64 'rate':125 'request':12,24,75,132,209 'request/response':177 'requir':98 'respons':213 'result':206 'return':29,77,194 'rout':172 'schema':175 'scheme':94 'settl':60 'site':152 'special':167 'specif':144 'structur':214 'subscript':129 'time':139 'unit':105 'unknown':216 'usd':114 'usdc':70,107,115 'usdc-base' 'use':69,89,116 'various':45 'via':4,16,61,83 'wallet':198 'x':86 'x-payment':85 'x402':5,17,63,91 'x402 finance API' 'x402-payment'","prices":[{"id":"6978319d-8c11-47fc-a99e-5b5e27e912d3","listingId":"b87fa019-c1be-490b-9da0-b0f431ff9120","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/51/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":"2026-04-18T18:52:56.606Z"}],"sources":[{"listingId":"b87fa019-c1be-490b-9da0-b0f431ff9120","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/51/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:56.606Z","lastSeenAt":"2026-04-27T22:33:21.404Z"}],"details":{"listingId":"b87fa019-c1be-490b-9da0-b0f431ff9120","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/51/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 challenge with x402Version 1, requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/51/performance"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/portfolios/51/performance"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists 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","Programmatic access to portfolio returns without API key management"],"bestFor":["Agents or apps needing on-demand portfolio performance data with no subscription","Developers who want to pay per call using USDC on Base","Automated workflows that need frictionless, keyless API access"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Bulk historical portfolio analysis requiring high-volume, low-latency calls (no documented rate limits but no guarantees either)","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.726Z"},"updatedAt":"2026-04-27T22:33:21.404Z"}}