{"id":"42e56f33-d9b3-432f-a078-06adcaceaf1b","shortId":"cWnrEK","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 provides portfolio performance data for a specific portfolio (ID 95) behind an x402 paywall. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).\n\nThe provider lowpaymentfee.com hosts a broad catalog of x402-gated APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per call. This particular endpoint falls under the finance category and appears to return performance metrics for a pre-defined portfolio. No API keys or rate limits are advertised; access is granted purely through the x402 payment protocol.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no description of request parameters, and no example responses. The endpoint is confirmed live (402 challenge captured), but the actual data returned after payment is unknown. Users should expect to experiment or contact the provider for details on the response format.","tags":[],"capabilities":["x402-payment","usdc-base-network","portfolio-performance","json-api","micropayment","no-api-key"],"categories":["finance"],"synonyms":["portfolio performance API","investment performance tracker","portfolio analytics","x402 finance API","Base USDC micropayment API","portfolio returns"],"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 data returned after payment is unknown.","Endpoint is scoped to a single hardcoded portfolio ID (95); unclear if other portfolio IDs are available.","Provider hosts many advertised endpoints but none have documented schemas."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/95/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/95/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 x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, no examples, and the docs pages are empty. The purpose of 'portfolio 95 performance' is opaque without further 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'0.02':10,23,76,107 '000':71 '0x8335':63 '20':70 '2913':64 '402':188 '6':81 '95':40 'Base USDC micropayment API' 'accept':47 'access':138 'actual':193 'advertis':137 'ai/ml':98 'analyt':97 'api':94,131,153 'appear':119 'base':8,21,58,72 'behind':41 'broad':88 'call':109 'captur':190 'catalog':89 'categori':117 'challeng':189 'confirm':186 'connect':162 'contact':206 'content':168 'contract':62 'cost':68 'data':3,16,34,96,194 'decim':82 'defin':128 'descript':175 'detail':210 'doc':152 'document':147 'endpoint':28,46,112,184 'equal':75 'exampl':181 'expect':202 'experi':204 'extrem':149 'fall':113 'financ':116 'finance/web3':100 'format':214 'gate':93 'grant':140 'host':86 'id':39 'infer':99 'infrastructur':102 'investment performance tracker' 'json':52 'json-api' 'key':132 'limit':135 'live':187 'lowpaymentfee.com':30,85 'maximum':67 'metric':123 'micropay':6,19 'micropayment' 'network':9,22,59 'no-api-key' 'openapi':172 'page':157 'paramet':178 'particular':111 'payment':53,145,197 'paywal':44 'per':77,108 'perform':2,15,33,122 'portfolio':1,14,32,38,129 'portfolio analytics' 'portfolio performance API' 'portfolio returns' 'portfolio-performance' 'post':48 'pre':127 'pre-defin':126 'price':105,154 'prompt':164 'protocol':146 'provid':31,84,208 'pure':141 'rate':134 'readm':156 'request':49,78,177 'respons':182,213 'return':51,121,159,195 'schema':173 'settl':55 'span':95 'spars':150 'specif':37 'substant':167 'unit':73 'unknown':199 'usdc':13,26,61,79 'usdc-base-network' 'use':60,80 'user':200 'util':103 'via':4,17 'wallet':163 'x402':5,18,43,92,144 'x402 finance API' 'x402-gated':91 'x402-payment'","prices":[{"id":"47de4a74-61a7-4fd5-8317-6402abab00f3","listingId":"42e56f33-d9b3-432f-a078-06adcaceaf1b","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/95/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":"2026-04-18T18:53:48.303Z"}],"sources":[{"listingId":"42e56f33-d9b3-432f-a078-06adcaceaf1b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/95/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:48.303Z","lastSeenAt":"2026-04-27T21:34:11.947Z"}],"details":{"listingId":"42e56f33-d9b3-432f-a078-06adcaceaf1b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/95/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":"Endpoint returns 402 with x402 challenge advertising USDC on Base network at maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/95/performance"},{"claim":"Provider 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 contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/95/performance"}],"useCases":["Retrieving performance metrics for portfolio #95 via a single micropayment","Integrating portfolio performance data into automated trading or analytics pipelines","Agent-driven portfolio monitoring without API key management"],"bestFor":["Developers wanting keyless, pay-per-call portfolio data access","AI agents that can settle x402 payments on Base","Quick one-off portfolio performance lookups without subscription commitments"],"notFor":["Users needing detailed documentation or guaranteed SLA before integrating","Bulk historical portfolio backtesting requiring thousands of calls at lower cost","Accessing arbitrary portfolio IDs (this endpoint is hardcoded to portfolio 95)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.299Z"},"updatedAt":"2026-04-27T21:34:11.947Z"}}