{"id":"95259739-c00f-4ed5-a4e3-143f6849c73d","shortId":"W8AgSD","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 16) 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 site 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 request. 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, pricing, API, and README pages all render 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 (returns a valid 402 challenge), but the actual shape of the response and what \"portfolio performance\" includes (returns, time series, benchmarks, etc.) is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","portfolio-performance","json-api","micropayment","no-api-key"],"categories":["finance"],"synonyms":["portfolio returns","investment performance","portfolio analytics","portfolio tracking","financial performance API","x402 finance"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or output schema provided; response format is entirely unknown","The specific portfolio (ID 16) is not described — unclear what asset class or strategy it represents","No SLA, rate limit, or uptime guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/16/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/16/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 request/response examples, and no description of what portfolio 16 is or what the performance response contains. Effectively a stub 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'0.02':10,23,76,108 '000':71 '0x8335':63 '16':40 '20':70 '2913':64 '402':192 '6':81 'accept':47 'access':139 'actual':196 'advertis':138 'ai/ml':99 'analyt':98 'api':95,132,155 'appear':120 'base':8,21,58,72 'behind':41 'benchmark':209 'broad':89 'catalog':90 'categori':118 'challeng':193 'confirm':187 'connect':163 'content':169 'contract':62 'cost':68 'data':3,16,34,97 'decim':82 'defin':129 'descript':176 'doc':153 'document':148 'endpoint':28,46,113,185 'equal':75 'etc':210 'exampl':182 'extrem':150 'fall':114 'financ':117 'finance/web3':101 'financial performance API' 'gate':94 'grant':141 'host':87 'id':39 'includ':205 'infer':100 'infrastructur':103 'investment performance' 'json':52 'json-api' 'key':133 'limit':136 'live':188 'lowpaymentfee.com':30,86 'maximum':67 'metric':124 'micropay':6,19 'micropayment' 'network':9,22,59 'no-api-key' 'openapi':173 'page':158 'paramet':179 'particular':112 'payment':53,146 'paywal':44 'per':77,109 'perform':2,15,33,123,204 'portfolio':1,14,32,38,130,203 'portfolio analytics' 'portfolio returns' 'portfolio tracking' 'portfolio-performance' 'post':48 'pre':128 'pre-defin':127 'price':106,154 'prompt':165 'protocol':147 'provid':31,84 'pure':142 'rate':135 'readm':157 'render':160 'request':49,78,110,178 'respons':183,200 'return':51,122,189,206 'schema':174 'seri':208 'settl':55 'shape':197 'site':85 'span':96 'spars':151 'specif':37 'substant':168 'time':207 'unit':73 'unknown':212 'usdc':13,26,61,79 'usdc-base-network' 'use':60,80 'util':104 'valid':191 'via':4,17 'wallet':164 'x402':5,18,43,93,145 'x402 finance' 'x402-gated':92 'x402-payment'","prices":[{"id":"076f9d5d-dd44-4717-9f07-5a56af0b6c7d","listingId":"95259739-c00f-4ed5-a4e3-143f6849c73d","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/16/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":"2026-04-18T18:52:24.280Z"}],"sources":[{"listingId":"95259739-c00f-4ed5-a4e3-143f6849c73d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/16/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:24.280Z","lastSeenAt":"2026-04-28T17:35:16.216Z"}],"details":{"listingId":"95259739-c00f-4ed5-a4e3-143f6849c73d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/16/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 a valid x402 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/16/performance"},{"claim":"All APIs on the site are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/16/performance"}],"useCases":["Retrieving performance metrics for a tracked portfolio","Agent-driven portfolio monitoring with per-request micropayments","Integrating portfolio performance data into dashboards without API key management"],"bestFor":["Agents or apps needing on-demand portfolio performance data with no subscription","Developers exploring x402 micropayment-gated finance APIs","Low-volume, pay-per-use portfolio analytics"],"notFor":["Users needing detailed API documentation or schema guarantees before integration","High-frequency trading or latency-sensitive applications (no SLA documented)","Users who cannot transact in USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.371Z"},"updatedAt":"2026-04-28T17:35:16.216Z"}}