{"id":"c28a00d9-7bc6-4694-9e0e-59f51314a092","shortId":"gs5Dyw","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 14. It is part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories — all settled via the x402 protocol on the Base network using USDC.\n\nThe endpoint is live and responds with a 402 Payment Required challenge, accepting x402 exact-scheme payments. The maximum amount required is 20,000 base units of USDC (0x8335…on Base), which equals $0.02 USD (USDC uses 6 decimals). The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what fields the portfolio performance response contains. The endpoint path suggests it returns performance metrics for a specific portfolio (ID 14), but the exact data shape is unknown. The platform advertises no API keys, no rate limits, and instant access as features.","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 API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","Endpoint is specific to portfolio ID 14; unclear if other portfolio IDs are accessible","Response data structure is completely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/14/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/14/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 and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet connect prompt. The purpose of the endpoint (portfolio 14 performance) is only inferable from the URL 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'0.02':10,23,106 '000':96 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':118 '0x8335':101 '14':38,187 '20':95 '300':123 '402':80 '6':110 'Base network API' 'USDC API' 'accept':84,127 'access':206 'across':52 'address':117 'advertis':197 'ai/ml':55 'amount':92 'analyt':54 'api':51,140,199 'application/json':132 'base':8,21,68,97,103 'base-network' 'broader':44 'categori':59 'challeng':83 'connect':148 'contain':173 'content':154 'data':3,16,34,53,191 'decim':111 'descript':165 'doc':138 'document':133 'endpoint':28,73,126,175 'equal':105 'exact':87,190 'exact-schem':86 'exampl':162 'extrem':135 'featur':208 'field':168 'finance/web3':56 'id':37,186 'infrastructur':58 'instant':205 'investment performance' 'json-response' 'key':200 'limit':203 'live':75 'lowpaymentfee.com':30 'maximum':91 'metric':181 'micropay':6,19 'micropayment API' 'network':9,22,69 'offer':46 'openapi':158 'page':143 'part':41 'path':176 'pay':48 'pay-per-call API' 'pay-per-request':47 'payment':81,89,113 'per':49 'perform':2,15,33,171,180 'platform':45,196 'portfolio':1,14,32,36,170,185 'portfolio analytics' 'portfolio performance API' 'portfolio-performance' 'post':128 'price':139 'prompt':150 'protocol':65 'rate':202 'readm':142 'render':145 'request':50,129 'request/response':161 'requir':82,93 'respond':77 'respons':172 'return':31,131,179 'schema':159 'scheme':88 'second':124 'sent':115 'settl':61 'shape':192 'spars':136 'specif':184 'suggest':177 'timeout':121 'unit':98 'unknown':194 'usd':107 'usdc':13,26,71,100,108 'usdc-settlement' 'use':70,109 'via':4,17,62 'wallet':149 'x402':5,18,64,85 'x402 finance API' 'x402-payment'","prices":[{"id":"19eba2bd-d0cd-4612-849b-dea566f456bd","listingId":"c28a00d9-7bc6-4694-9e0e-59f51314a092","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/14/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":"2026-04-18T18:52:15.899Z"}],"sources":[{"listingId":"c28a00d9-7bc6-4694-9e0e-59f51314a092","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/14/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:15.899Z","lastSeenAt":"2026-04-28T06:34:17.279Z"}],"details":{"listingId":"c28a00d9-7bc6-4694-9e0e-59f51314a092","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/14/performance \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\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 a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/14/performance"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/14/performance"}],"useCases":["Retrieving performance data for a specific investment portfolio","Integrating portfolio analytics into agent workflows without API key management","On-demand financial data access with per-request USDC micropayments"],"bestFor":["Agents needing portfolio performance data with zero signup friction","Developers wanting pay-per-use financial APIs settled on Base","Automated workflows requiring keyless API access"],"notFor":["Users needing detailed API documentation or response schema before integrating","Bulk data retrieval where per-request pricing becomes expensive","Accessing portfolios other than ID 14 (only this specific portfolio endpoint is documented here)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.737Z"},"updatedAt":"2026-04-28T06:34:17.279Z"}}