{"id":"ba826f9e-583f-4496-ba49-e099bd99c09f","shortId":"h7DbAC","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 22) behind an x402 paywall. The endpoint accepts POST requests and responds with JSON. Payment is settled on the Base network using USDC (USD Coin) at a cost of $0.02 per request (20,000 base units with 6 decimals). No API keys or rate limits are required — access is granted per-call via the x402 payment protocol.\n\nThe provider site (lowpaymentfee.com) hosts a broader catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced at $0.02 per request. However, this specific endpoint is focused on portfolio performance. The exact schema of the response body is not documented in the crawled material; the only confirmed output detail is that the MIME type is application/json. Documentation pages (/docs, /pricing, /api) returned minimal content (just a \"Connect wallet\" prompt), so the request/response structure must be inferred.\n\nThe endpoint is live: it returned a valid x402 version-1 challenge with a 402 status code. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base. The maximum timeout for payment settlement is 300 seconds.","tags":[],"capabilities":["portfolio-performance","x402-payment","usdc-micropayment","base-network","json-api","pay-per-call"],"categories":["finance","data"],"synonyms":["portfolio analytics","investment performance","portfolio returns","financial data API","x402 finance","micropayment API","portfolio tracking"],"warnings":["No request or response schema is documented; the exact fields returned are unknown.","Documentation pages (/docs, /pricing, /api, /README) all returned only a 'Connect wallet' prompt with no useful content.","The specific portfolio (ID 22) is hardcoded in the URL with no explanation of what it represents.","The broader site lists many API categories but it is unclear whether all endpoints are functional or placeholders."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/22/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/22/performance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing and payment details. However, there is no documented request body schema, no response schema, and the docs/pricing/API pages are effectively empty. The purpose of 'portfolio 22 performance' is opaque — it is unclear what portfolio this refers to or what data is 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