{"id":"7280848a-51f0-47c4-af07-50b81e7bd75b","shortId":"3EKjPZ","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 88) 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 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 additional technical detail. There is no OpenAPI schema, no request/response examples, and no description of what fields the portfolio performance response contains or what parameters the POST body accepts. The endpoint is confirmed live (returns a proper 402 challenge), but the actual data contract is unknown.","tags":[],"capabilities":["x402-payment","portfolio-performance","usdc-base-network","micropayment","json-api","no-api-key"],"categories":["finance"],"synonyms":["portfolio performance API","investment performance","portfolio analytics","x402 finance API","pay-per-call portfolio data","Base USDC API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","No OpenAPI or output schema describing request parameters or response fields","Portfolio ID 88 is hard-coded in the URL; unclear if other portfolio IDs are valid","The provider site lists many API categories but this specific endpoint (/portfolios/88/performance) is not listed on the homepage catalog"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/88/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/88/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 zero documentation on request parameters or response schema. Docs pages are empty stubs. The actual data returned is completely unknown, making integration 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'0.02':10,23,76,107 '000':71 '0x8335':63 '20':70 '2913':64 '402':204 '6':81 '88':40 'Base USDC API' 'accept':47,195 'access':138 'actual':208 'addit':167 'advertis':137 'ai/ml':98 'analyt':97 'api':94,131,154 'appear':119 'base':8,21,58,72 'behind':41 'bodi':194 'broad':88 'catalog':89 'categori':117 'challeng':205 'confirm':199 'connect':162 'contain':188 'contract':62,210 'cost':68 'data':3,16,34,96,209 'decim':82 'defin':128 'descript':180 'detail':169 'doc':152 'document':147 'endpoint':28,46,112,197 'equal':75 'exampl':177 'extrem':149 'fall':113 'field':183 'financ':116 'finance/web3':100 'gate':93 'grant':140 'host':86 'id':39 'infer':99 'infrastructur':102 'investment performance' 'json':52 'json-api' 'key':132 'limit':135 'live':200 'lowpaymentfee.com':30,85 'maximum':67 'metric':123 'micropay':6,19 'micropayment' 'network':9,22,59 'no-api-key' 'openapi':173 'page':157 'paramet':191 'particular':111 'pay-per-call portfolio data' 'payment':53,145 'paywal':44 'per':77,108 'perform':2,15,33,122,186 'portfolio':1,14,32,38,129,185 'portfolio analytics' 'portfolio performance API' 'portfolio-performance' 'post':48,193 'pre':127 'pre-defin':126 'price':105,153 'prompt':164 'proper':203 'protocol':146 'provid':31,84 'pure':141 'rate':134 'readm':156 'render':159 'request':49,78,109 'request/response':176 'respons':187 'return':51,121,201 'schema':174 'settl':55 'span':95 'spars':150 'specif':37 'technic':168 'unit':73 'unknown':212 'usdc':13,26,61,79 'usdc-base-network' 'use':60,80 'util':103 'via':4,17 'wallet':163 'x402':5,18,43,92,144 'x402 finance API' 'x402-gated':91 'x402-payment'","prices":[{"id":"3436c8a9-d051-452b-a129-021da546c370","listingId":"7280848a-51f0-47c4-af07-50b81e7bd75b","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/88/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":"2026-04-18T18:53:36.864Z"}],"sources":[{"listingId":"7280848a-51f0-47c4-af07-50b81e7bd75b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/88/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:36.864Z","lastSeenAt":"2026-04-27T22:33:23.014Z"}],"details":{"listingId":"7280848a-51f0-47c4-af07-50b81e7bd75b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/88/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 on POST, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/portfolios/88/performance"},{"claim":"Payment asset is USDC on Base network at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with maxAmountRequired of 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/portfolios/88/performance"},{"claim":"Provider advertises $0.02/request pricing, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving performance metrics for portfolio #88 via a single micropayment","Integrating portfolio performance data into an agent workflow without API key management","Programmatic access to portfolio analytics settled on Base L2"],"bestFor":["Agents or bots that need on-demand portfolio performance data without subscription commitments","Developers experimenting with x402 pay-per-call APIs on Base","Low-volume consumers who prefer micropayments over monthly plans"],"notFor":["Users who need documented request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone needing performance data for portfolios other than ID 88 (no evidence other IDs are supported)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.824Z"},"updatedAt":"2026-04-27T22:33:23.014Z"}}