{"id":"3967d005-4c79-4edd-bd67-fdeb98a75e32","shortId":"N5zrT7","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 85) 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 request. This particular endpoint falls under the finance category and appears to return performance metrics for a portfolio. No OpenAPI schema, detailed documentation, or example responses were found in the crawl; the docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nBecause no request/response schema is documented and the endpoint path is portfolio-specific (hardcoded ID 85), the practical utility for arbitrary callers is unclear. There is no information on what fields the response contains, what time range is covered, or whether the portfolio ID can be changed. Agents should treat this as a low-documentation endpoint and test with a small payment first.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-performance","json-response","micropayment","pay-per-request"],"categories":["finance","data"],"synonyms":["portfolio performance API","investment performance","portfolio analytics","x402 finance API","Base USDC API","lowpaymentfee"],"warnings":["No OpenAPI or request/response schema available","Documentation pages (docs, pricing, API, README) return only 'Connect wallet' with no content","Endpoint path is hardcoded to portfolio ID 85; unclear if other IDs are supported","No example responses available to verify what data is actually returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/85/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/85/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 OpenAPI schema, no documented request/response format, no examples, and the docs pages are empty. The hardcoded portfolio ID and lack of any substantive documentation make this effectively a stub 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'0.02':10,23,76,107 '000':71 '0x8335':63 '20':70 '2913':64 '6':81 '85':40,173 'Base USDC API' 'accept':47 'agent':205 'ai/ml':98 'analyt':97 'api':94,144 'appear':119 'arbitrari':178 'base':8,21,58,72 'behind':41 'broad':88 'caller':179 'catalog':89 'categori':117 'chang':204 'connect':150 'contain':191 'content':156 'contract':62 'cost':68 'cover':196 'crawl':139 'data':3,16,34,96 'decim':82 'detail':130 'doc':141 'document':131,162,213 'endpoint':28,46,112,165,214 'equal':75 'exampl':133 'fall':113 'field':188 'financ':116 'finance/web3':100 'first':221 'found':136 'gate':93 'hardcod':171 'host':86 'id':39,172,201 'infer':99 'inform':185 'infrastructur':102 'investment performance' 'json':52 'json-response' 'low':212 'low-document':211 'lowpaymentfee' 'lowpaymentfee.com':30,85 'maximum':67 'metric':123 'micropay':6,19 'micropayment' 'network':9,22,59 'openapi':128 'page':145 'particular':111 'path':166 'pay-per-request' 'payment':53,220 'paywal':44 'per':77,108 'perform':2,15,33,122 'portfolio':1,14,32,38,126,169,200 'portfolio analytics' 'portfolio performance API' 'portfolio-performance' 'portfolio-specif':168 'post':48 'practic':175 'price':105,142 'prompt':152 'provid':31,84 'rang':194 'request':49,78,109 'request/response':159 'respons':134,190 'return':51,121,147 'schema':129,160 'settl':55 'small':219 'span':95 'specif':37,170 'substant':155 'test':216 'time':193 'treat':207 'unclear':181 'unit':73 'usdc':13,26,61,79 'usdc-base' 'use':60,80 'util':103,176 'via':4,17 'wallet':151 'whether':198 'x402':5,18,43,92 'x402 finance API' 'x402-gated':91 'x402-payment'","prices":[{"id":"9722f1d0-2c87-4acf-a859-f56b8ff56fb4","listingId":"3967d005-4c79-4edd-bd67-fdeb98a75e32","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/85/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":"2026-04-18T18:53:29.056Z"}],"sources":[{"listingId":"3967d005-4c79-4edd-bd67-fdeb98a75e32","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/85/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:29.056Z","lastSeenAt":"2026-04-27T15:34:26.081Z"}],"details":{"listingId":"3967d005-4c79-4edd-bd67-fdeb98a75e32","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/85/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 HTTP 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/85/performance"},{"claim":"Max amount required is 20000 base units of USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/portfolios/85/performance"},{"claim":"Provider advertises $0.02/request pricing across all APIs with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving performance data for portfolio #85 via a single micropayment","Integrating pay-per-call portfolio analytics into an agent workflow","Demonstrating x402 payment protocol usage on Base network"],"bestFor":["Agents needing on-demand portfolio performance data without API keys","Developers experimenting with x402 micropayment protocol","Low-volume, pay-as-you-go financial data access"],"notFor":["High-volume portfolio analytics requiring bulk or subscription pricing","Users who need detailed API documentation or guaranteed SLAs","Querying arbitrary portfolio IDs (endpoint is hardcoded to portfolio 85)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.254Z"},"updatedAt":"2026-04-27T15:34:26.081Z"}}