{"id":"0a486b63-8828-4919-bfe4-4a6f9c181614","shortId":"anDbUJ","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 provides portfolio performance data for a specific portfolio (ID 99) behind an x402 paywall. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals).\n\nThe provider, lowpaymentfee.com, operates a broad catalog of x402-gated API endpoints spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced uniformly at $0.02 per call. The specific endpoint probed here (`/api/v1/portfolios/99/performance`) is not listed on the provider's landing page among the advertised APIs, suggesting it may be an unlisted or example route. No OpenAPI schema, request/response examples, or detailed documentation were found during crawling; the docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nBecause no input or output schema is documented beyond the x402 challenge metadata, callers should expect a JSON response but cannot know the exact shape without experimentation. The endpoint is confirmed live (402 challenge returned successfully). The x402 challenge specifies a 300-second payment timeout and uses the \"exact\" payment scheme on Base mainnet.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-performance","json-api","micropayment"],"categories":["finance","data"],"synonyms":["portfolio performance API","investment performance","x402 finance API","Base USDC API","pay-per-call portfolio data","lowpaymentfee"],"warnings":["No OpenAPI or JSON schema available for request or response bodies","This specific endpoint (/api/v1/portfolios/99/performance) is not listed on the provider's landing page — may be an example or unlisted route","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no content","No evidence that other portfolio IDs are supported"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/99/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/99/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, but there is no OpenAPI schema, no request/response examples, and no meaningful documentation. The specific portfolio endpoint is not listed among the provider's advertised APIs. Effectively a stub 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'0.02':10,22,66,102 '000':70 '0x8335':60 '20':69 '2913':61 '300':203 '402':194 '6':74 '99':38 'Base USDC API' 'accept':44 'advertis':122 'ai/ml':92 'among':120 'analyt':91 'api':87,123,149 'base':8,20,55,71,214 'behind':39 'beyond':170 'broad':81 'call':104 'caller':175 'cannot':182 'catalog':82 'challeng':173,195,200 'confirm':192 'connect':155 'content':161 'contract':59 'cost':64 'crawl':144 'data':3,15,32,90 'decim':75 'detail':139 'doc':146 'document':140,169 'endpoint':26,88,107,190 'exact':185,210 'exampl':131,137 'expect':177 'experiment':188 'finance/web3':94 'found':142 'gate':86 'id':37 'infer':93 'infrastructur':96 'input':164 'investment performance' 'json':49,179 'json-api' 'know':183 'land':118 'list':113 'live':193 'lowpaymentfee' 'lowpaymentfee.com':28,78 'mainnet':215 'may':126 'metadata':174 'micropay':6,18 'micropayment' 'network':9,21,56 'openapi':134 'oper':79 'output':166 'page':119,150 'pay-per-call portfolio data' 'payment':50,205,211 'paywal':42 'per':11,23,67,103 'perform':2,14,31 'portfolio':1,13,30,36 'portfolio performance API' 'portfolio-performance' 'post':45 'price':99,147 'probe':108 'prompt':157 'provid':29,77,116 'request':12,24,46,68 'request/response':136 'respons':180 'return':48,152,196 'rout':132 'schema':135,167 'scheme':212 'second':204 'settl':52 'shape':186 'span':89 'specif':35,106 'specifi':201 'substant':160 'success':197 'suggest':124 'timeout':206 'uniform':100 'unit':72 'unlist':129 'usdc':58 'usdc-base' 'use':57,208 'util':97 'via':4,16 'wallet':156 'without':187 'x402':5,17,41,85,172,199 'x402 finance API' 'x402-gated':84 'x402-payment'","prices":[{"id":"2e604752-70a8-4626-8695-1bd4f7cc4fdc","listingId":"0a486b63-8828-4919-bfe4-4a6f9c181614","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/99/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":"2026-04-18T18:53:50.094Z"}],"sources":[{"listingId":"0a486b63-8828-4919-bfe4-4a6f9c181614","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/99/performance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:50.094Z","lastSeenAt":"2026-04-27T13:04:58.754Z"}],"details":{"listingId":"0a486b63-8828-4919-bfe4-4a6f9c181614","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/99/performance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/99/performance"},{"claim":"The provider advertises uniform $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 is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/99/performance"}],"useCases":["Retrieve performance metrics for a specific investment portfolio","Integrate portfolio analytics into an automated trading or reporting agent","Pay-per-call access to financial performance data without API keys"],"bestFor":["Agents needing on-demand portfolio performance data without subscription commitments","Developers experimenting with x402 micropayment-gated finance APIs","Automated workflows that need keyless, pay-per-request financial data"],"notFor":["Users who need detailed API documentation or guaranteed schema stability","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone needing portfolio data for IDs other than 99 (no evidence other IDs are supported)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.177Z"},"updatedAt":"2026-04-27T13:04:58.754Z"}}