{"id":"cd3de9ec-9926-448d-9813-6b17d7670001","shortId":"bkkYSx","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 29. 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 accepts POST requests and returns JSON. Payment is handled inline via the X-PAYMENT header using the x402 exact scheme. The maximum amount required per call is 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base. No API keys or rate limits are advertised; access is gated solely by micropayment.\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 endpoint is confirmed live (402 challenge captured), but the actual data returned after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","portfolio-performance","json-response","pay-per-request"],"categories":["finance","data"],"synonyms":["portfolio performance API","investment performance","portfolio analytics","x402 finance API","micropayment API","USDC API","Base network API"],"warnings":["No documentation available — docs, API, pricing, and README pages all return only a wallet-connect prompt with no content.","No request or response schema provided; the structure of the returned portfolio performance data is unknown.","The endpoint is specific to portfolio ID 29; it is unclear whether other portfolio IDs are supported or what they represent.","No OpenAPI spec or ai-plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/29/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/29/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($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 the data (portfolio 29 performance) is only inferable from the URL 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'0.02':10,23,108 '000':103 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':121 '20':102 '29':38 '402':185 '6':113 'Base network API' 'USDC API' 'accept':74 'access':132 'across':52 'actual':190 'address':120 'advertis':131 'ai/ml':55 'amount':97 'analyt':54 'api':51,125,145 'base':8,21,68,104,123 'base-network' 'broader':44 'call':100 'captur':187 'categori':59 'challeng':186 'confirm':183 'connect':154 'contain':179 'content':160 'crawl':143 'data':3,16,34,53,191 'decim':114 'descript':171 'doc':144 'document':138 'endpoint':28,73,181 'exact':93 'exampl':168 'extrem':140 'field':174 'financ':56 'gate':134 'handl':82 'header':89 'id':37 'infrastructur':58 'inlin':83 'investment performance' 'json':79 'json-response' 'key':126 'limit':129 'live':184 'lowpaymentfee.com':30 'maximum':96 'micropay':6,19,137 'micropayment API' 'network':9,22,69 'offer':46 'openapi':164 'page':149 'part':41 'pay':48 'pay-per-request':47 'payment':80,88,116,194 'per':49,99 'perform':2,15,33,177 'platform':45 'portfolio':1,14,32,36,176 'portfolio analytics' 'portfolio performance API' 'portfolio-performance' 'post':75 'price':146 'prompt':156 'protocol':65 'rate':128 'readm':148 'request':50,76 'request/response':167 'requir':98 'respons':178 'return':31,78,151,192 'schema':165 'scheme':94 'sent':118 'settl':61 'sinc':110 'sole':135 'spars':141 'substant':159 'unit':105 'unknown':196 'usd':109 'usdc':13,26,71,107,111 'usdc-micropayment' 'use':70,90,112 'via':4,17,62,84 'wallet':155 'x':87 'x-payment':86 'x402':5,18,64,92 'x402 finance API' 'x402-payment'","prices":[{"id":"b48458ed-f3ec-4792-98e9-55624e0439d5","listingId":"cd3de9ec-9926-448d-9813-6b17d7670001","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/29/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":"2026-04-18T18:52:25.487Z"}],"sources":[{"listingId":"cd3de9ec-9926-448d-9813-6b17d7670001","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/29/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:25.487Z","lastSeenAt":"2026-04-28T05:04:34.736Z"}],"details":{"listingId":"cd3de9ec-9926-448d-9813-6b17d7670001","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/29/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 maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/29/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":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/29/performance"}],"useCases":["Retrieving performance metrics for a specific investment portfolio","Programmatic portfolio monitoring by AI agents paying per request","Integrating portfolio data into dashboards without API key management"],"bestFor":["Agents or apps that need on-demand portfolio performance data without subscription commitments","Developers wanting to test x402 micropayment integration on Base","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Users needing detailed API documentation or response schema before committing","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone needing portfolio data for IDs other than 29 (no evidence other IDs are supported at this endpoint)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.264Z"},"updatedAt":"2026-04-28T05:04:34.736Z"}}