{"id":"a43ea1c1-6a16-4a97-9873-a6594a097968","shortId":"AZhVFe","kind":"x402","title":"Portfolio performance data via x402 micropayment on Base network, $0.02 per request.","tagline":"Portfolio performance data via x402 micropayment on Base network, $0.02 per request.","description":"This endpoint at lowpaymentfee.com returns portfolio performance data for a specific portfolio (ID 36) behind an x402 paywall. It accepts POST requests and responds with JSON. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) at a cost of $0.02 per request (20,000 base units with 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 call. This particular endpoint sits under the finance category. No API keys are required; callers authenticate purely through the x402 payment header. The site advertises no rate limits and instant access.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the actual shape of the portfolio performance response is unknown.","tags":[],"capabilities":["x402-payment","portfolio-performance","usdc-base","micropayment","json-api","no-api-key"],"categories":["finance"],"synonyms":["portfolio analytics","investment performance","portfolio returns","financial data API","portfolio tracking","x402 finance endpoint"],"warnings":["No OpenAPI spec or schema available — request and response formats are completely unknown","Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no content","The endpoint is hardcoded to portfolio ID 36; it is unclear whether other portfolio IDs are available or what this portfolio represents","No examples of successful responses exist in the crawl material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/36/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/36/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 402 challenge and clear pricing, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The portfolio endpoint path is specific (portfolio 36) with no explanation of what data it returns. Effectively a stub 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'000':70 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':61 '20':69 '36':38 '402':178 '6':74 'accept':44 'access':133 'actual':182 'addit':154 'advertis':127 'ai/ml':92 'analyt':91 'api':88,113,140 'authent':118 'avail':169 'base':8,20,56,71 'behind':39 'broad':82 'call':103 'caller':117 'catalog':83 'categori':111 'challeng':179 'confirm':173 'connect':149 'contract':60 'cost':64 'data':3,15,32,90 'decim':75 'detail':156 'doc':139 'document':134 'endpoint':26,106,171 'exampl':167 'extrem':136 'financ':110 'finance/web3':94 'financial data API' 'gate':87 'header':124 'host':80 'id':37 'infer':93 'infrastructur':96 'instant':132 'investment performance' 'json':50 'json-api' 'key':114 'limit':130 'live':174 'lowpaymentfee.com':28,79 'micropay':6,18 'micropayment' 'network':9,21,57 'no-api-key' 'openapi':160 'page':144 'particular':105 'payload':168 'payment':51,123 'paywal':42 'per':11,23,67,102 'perform':2,14,31,187 'portfolio':1,13,30,36,186 'portfolio analytics' 'portfolio returns' 'portfolio tracking' 'portfolio-performance' 'post':45 'price':99,141 'prompt':151 'proper':177 'provid':77 'pure':119 'rate':129 'readm':143 'render':146 'request':12,24,46,68 'request/response':163 'requir':116 'respond':48 'respons':188 'return':29,175 'schema':164 'settl':53 'shape':183 'sit':107 'site':78,126 'span':89 'spars':137 'spec':161 'specif':35 'technic':155 'unit':72 'unknown':190 'usdc':59 'usdc-base' 'use':58 'util':97 'via':4,16 'wallet':150 'x402':5,17,41,86,122 'x402 finance endpoint' 'x402-gated':85 'x402-payment'","prices":[{"id":"41cfc02f-a72c-49ef-b991-335fb19caa9b","listingId":"a43ea1c1-6a16-4a97-9873-a6594a097968","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/36/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":"2026-04-18T18:52:38.743Z"}],"sources":[{"listingId":"a43ea1c1-6a16-4a97-9873-a6594a097968","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/36/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:38.743Z","lastSeenAt":"2026-04-28T14:35:21.700Z"}],"details":{"listingId":"a43ea1c1-6a16-4a97-9873-a6594a097968","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/36/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":"The endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/36/performance"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/portfolios/36/performance"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/36/performance"}],"useCases":["Fetching performance metrics for a tracked portfolio","Integrating portfolio performance data into a dashboard or agent workflow","Programmatic access to portfolio returns without API key management"],"bestFor":["Agents or apps that need on-demand portfolio performance data with pay-per-call pricing","Developers who want keyless API access settled via USDC on Base","Lightweight integrations where $0.02/request micropayments are acceptable"],"notFor":["Users needing detailed API documentation or guaranteed response schemas before integrating","High-volume batch analytics where per-request pricing would be costly","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:00.681Z"},"updatedAt":"2026-04-28T14:35:21.700Z"}}