{"id":"626ef327-a7b5-4338-8a98-9dfd96f1960e","shortId":"hbaHu5","kind":"x402","title":"Portfolio performance data via x402 micropayment on Base network for $0.02/request.","tagline":"Portfolio performance data via x402 micropayment on Base network for $0.02/request.","description":"This endpoint at lowpaymentfee.com returns portfolio performance data for portfolio ID 31. It is part of a broader platform offering various 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. Each request costs $0.02 (20,000 base units of USDC with 6 decimals).\n\nThe platform advertises a simple pricing model: $0.02 per request with no API keys, no rate limits, no minimums, and instant access. The endpoint accepts POST requests and returns JSON. However, documentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what \"portfolio performance\" data actually contains or what parameters the POST body expects.\n\nBecause the specific endpoint path (`/portfolios/31/performance`) is not listed on the site's landing page among the advertised APIs, it may be a custom or less-documented route. The x402 challenge confirms the endpoint is live and accepting payment-gated requests, but the lack of any input/output schema or documentation makes integration speculative.","tags":[],"capabilities":["x402-payment","usdc-base-network","portfolio-performance","pay-per-request","json-api"],"categories":["finance"],"synonyms":["portfolio performance API","investment performance data","portfolio analytics","financial performance endpoint","x402 finance API","micropayment portfolio data"],"warnings":["No request or response schema available — input parameters are unknown","Documentation pages (/docs, /api, /pricing, /README) contain no useful content beyond 'Connect wallet'","This specific endpoint path (/portfolios/31/performance) is not listed among the site's advertised APIs","No information on what portfolio ID 31 represents or whether other portfolio IDs are accessible"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/31/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/31/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation on request parameters, response schema, or what 'portfolio performance' actually returns. Docs pages are empty. No OpenAPI spec. This is effectively a stub 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'/request':12,24 '0.02':11,23,76,93 '000':78 '20':77 '31':36 '6':84 'accept':110,203 'access':107 'across':51 'actual':156 'advertis':88,182 'ai/ml':54 'among':180 'analyt':53 'api':50,98,123,183 'base':8,20,71,79 'bodi':163 'broader':42 'categori':58 'challeng':196 'confirm':197 'connect':132 'contain':157 'cost':75 'custom':188 'data':3,15,32,52,155 'decim':85 'descript':150 'detail':139 'doc':122 'document':117,192,216 'endpoint':26,60,109,168,199 'exampl':147 'expect':164 'extrem':119 'financ':55 'financial performance endpoint' 'gate':206 'howev':116 'id':35 'infrastructur':57 'input/output':213 'instant':106 'integr':218 'investment performance data' 'json':115 'json-api' 'key':99 'lack':210 'land':178 'less':191 'less-docu':190 'limit':102 'list':173 'live':201 'lowpaymentfee.com':28 'make':217 'may':185 'micropay':6,18 'micropayment portfolio data' 'minimum':104 'model':92 'network':9,21,72 'offer':44 'openapi':143 'page':127,179 'paramet':160 'part':39 'path':169 'pay':47 'pay-per-request':46 'payment':64,205 'payment-g':204 'per':48,94 'perform':2,14,31,154 'platform':43,87 'portfolio':1,13,30,34,153 'portfolio analytics' 'portfolio performance API' 'portfolio-performance' 'post':111,162 'price':91,124 'prompt':134 'protocol':65 'rate':101 'readm':126 'render':129 'request':49,74,95,112,207 'request/response':146 'return':29,114 'rout':193 'schema':144,214 'settl':66 'simpl':90 'site':176 'spars':120 'specif':167 'specul':219 'technic':138 'unit':80 'usdc':68,82 'usdc-base-network' 'use':61 'various':45 'via':4,16 'wallet':133 'x402':5,17,63,195 'x402 finance API' 'x402-payment'","prices":[{"id":"b51b6058-e654-4f1c-a846-4e9a6361a683","listingId":"626ef327-a7b5-4338-8a98-9dfd96f1960e","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/31/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":"2026-04-18T18:52:39.934Z"}],"sources":[{"listingId":"626ef327-a7b5-4338-8a98-9dfd96f1960e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/31/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:39.934Z","lastSeenAt":"2026-04-28T14:35:21.847Z"}],"details":{"listingId":"626ef327-a7b5-4338-8a98-9dfd96f1960e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/31/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 HTTP 402 with an x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/31/performance"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), which equals $0.02","source_url":"https://lowpaymentfee.com/api/v1/portfolios/31/performance"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no technical documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving performance metrics for a specific investment portfolio","Integrating portfolio performance data into dashboards or reporting tools","Agent-driven portfolio monitoring with per-call micropayments"],"bestFor":["Developers needing on-demand portfolio performance data without subscriptions","AI agents that can settle x402 payments in USDC on Base","Users who want pay-per-use financial data without API key management"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone needing portfolio data for IDs other than 31 (no evidence other IDs are supported at this path)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.563Z"},"updatedAt":"2026-04-28T14:35:21.847Z"}}