{"id":"277c5ba3-d0c2-4fc7-b92c-55d4e83c2034","shortId":"rTeu3v","kind":"x402","title":"Portfolio performance data via x402 micropayment on Base network, $0.02/request in USDC.","tagline":"Portfolio performance data via x402 micropayment on Base network, $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com returns portfolio performance data for portfolio ID 43. It is part of a broader platform offering pay-per-request 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 is live and responds with a standard x402 payment challenge (HTTP 402) requiring an X-PAYMENT header. The price is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base, using the USDC contract at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI schema, no description of the response payload, and no information about what \"portfolio 43\" represents or what performance metrics are returned. The platform advertises no API keys, no rate limits, and instant access, but specifics about the data source, update frequency, or response format are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-performance","pay-per-request","json-response"],"categories":["finance","data"],"synonyms":["portfolio performance API","investment performance","portfolio analytics","x402 finance API","micropayment API","USDC API","Base network API","pay-per-call API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or response schema provided; the structure of the response payload is completely unknown.","The specific endpoint /api/v1/portfolios/43/performance is not listed among the provider's advertised APIs on the homepage.","Unknown data source and update frequency for portfolio performance data.","Portfolio ID 43 is hardcoded in the URL; it is unclear whether other portfolio IDs are available or what this portfolio represents."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/43/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/43/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 and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI schema, no example responses, and no description of what data is actually returned. The specific endpoint (portfolios/43/performance) is not even listed on the provider's homepage. This is effectively a stub 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'0.02':10,23,105 '000':96 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':113 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':121 '20':95 '402':85 '43':38,170 '6':101 'Base network API' 'USDC API' 'accept':124 'access':189 'across':52 'addit':150 'address':112 'advertis':180 'ai/ml':55 'analyt':54 'api':51,136,182 'application/json':129 'base':8,21,68,97,115 'base-network' 'broader':44 'categori':59 'challeng':83 'connect':145 'contract':119 'data':3,16,34,53,194 'decim':102 'descript':159 'detail':152 'doc':135 'document':130 'endpoint':28,73,123 'equal':104 'extrem':132 'financ':56 'format':200 'frequenc':197 'header':91 'http':84 'id':37 'inform':166 'infrastructur':58 'instant':188 'investment performance' 'json-response' 'key':183 'limit':186 'live':75 'lowpaymentfee.com':30 'made':110 'metric':175 'micropay':6,19 'micropayment API' 'network':9,22,69 'offer':46 'openapi':156 'page':140 'part':41 'pay':48 'pay-per-call API' 'pay-per-request':47 'payload':163 'payment':82,90,108 'per':49,106 'perform':2,15,33,174 'platform':45,179 'portfolio':1,14,32,36,169 'portfolio analytics' 'portfolio performance API' 'portfolio-performance' 'post':125 'price':93,137 'prompt':147 'protocol':65 'rate':185 'readm':139 'render':142 'repres':171 'request':50,107,126 'requir':86 'respond':77 'respons':162,199 'return':31,128,177 'schema':157 'settl':61 'sourc':195 'spars':133 'specif':191 'standard':80 'technic':151 'unit':98 'unknown':202 'updat':196 'usdc':13,26,71,100,118 'usdc-settlement' 'use':70,116 'via':4,17,62 'wallet':146 'x':89 'x-payment':88 'x402':5,18,64,81 'x402 finance API' 'x402-payment'","prices":[{"id":"56dda35b-16f4-46fe-b6b9-8a772f1f3d3b","listingId":"277c5ba3-d0c2-4fc7-b92c-55d4e83c2034","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/43/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":"2026-04-18T18:52:57.793Z"}],"sources":[{"listingId":"277c5ba3-d0c2-4fc7-b92c-55d4e83c2034","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/43/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:57.793Z","lastSeenAt":"2026-04-27T22:33:21.429Z"}],"details":{"listingId":"277c5ba3-d0c2-4fc7-b92c-55d4e83c2034","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/43/performance \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns HTTP 402 with x402 challenge requiring X-PAYMENT header, price 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/43/performance"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/43/performance"}],"useCases":["Retrieving portfolio performance metrics on demand without API key registration","Integrating portfolio data into agent workflows that support x402 micropayments","Programmatic access to financial performance data settled in USDC on Base"],"bestFor":["Agents or bots that can settle x402 payments on Base","Users who want keyless, pay-per-request access to portfolio data","Developers building on the x402 protocol looking for low-cost endpoints"],"notFor":["Users needing detailed documentation or guaranteed SLAs before integration","Bulk historical portfolio data retrieval (no batch or streaming support documented)","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.725Z"},"updatedAt":"2026-04-27T22:33:21.429Z"}}