{"id":"99d61f02-b4cf-4f64-961d-ebf67b507a7f","shortId":"PemBsz","kind":"x402","title":"Portfolio performance data via x402 micropayment on Base (USDC, $0.02/request).","tagline":"Portfolio performance data via x402 micropayment on Base (USDC, $0.02/request).","description":"This endpoint at lowpaymentfee.com returns portfolio performance data for portfolio ID 15. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 market data, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network.\n\nThe specific endpoint `/api/v1/portfolios/15/performance` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises uniform $0.02/request pricing across all its endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what fields the portfolio performance response contains. The endpoint is confirmed live (402 challenge returned), but the actual data content and input parameters remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","portfolio-performance","pay-per-call","json-response","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio performance API","investment performance","portfolio analytics","portfolio returns","financial performance data","x402 finance API"],"warnings":["No OpenAPI schema or response schema available — response format is entirely unknown","Documentation pages (docs, pricing, API, README) all render only 'Connect wallet' with no usable content","The endpoint path is hardcoded to portfolio ID 15; it is unclear if other IDs exist or what this portfolio represents","No request body schema documented; unknown what parameters (if any) the POST body accepts"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/15/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/15/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 x402 challenge and clear pricing, but there is no OpenAPI schema, no documentation of request parameters or response fields, and no examples. The portfolio-specific path (/portfolios/15) is unexplained — it's unclear whether other portfolio IDs are available or what 'performance' data is 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\\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/15/performance"},{"claim":"Platform advertises $0.02/request uniform pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/15/performance"}],"useCases":["Retrieving performance metrics for a specific investment portfolio","Integrating portfolio performance data into dashboards or reporting tools","Agent-driven portfolio monitoring with micropayment 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