{"id":"a4ce7d67-d321-4540-a7e9-19a2d1c1d4ea","shortId":"6mpsSH","kind":"x402","title":"Pay-per-call portfolio holdings API on Base network via x402 protocol, settled in USDC.","tagline":"Pay-per-call portfolio holdings API on Base network via x402 protocol, settled in USDC.","description":"This endpoint at lowpaymentfee.com provides access to portfolio holdings data (portfolio ID 63) via a POST request. It uses the x402 payment protocol, requiring a per-request USDC payment on the Base network. The cost is $0.02 per request (20,000 base units of USDC with 6 decimals).\n\nThe provider operates a broader platform offering various API categories including data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities—all at the same $0.02/request price point. The platform advertises no API keys, no rate limits, and instant access. Payment is made via the x402 X-PAYMENT header using USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).\n\nDocumentation is extremely sparse—the docs, API, pricing, and README pages all only show a \"Connect wallet\" prompt with no additional technical detail. The specific response schema for this holdings endpoint is not documented, so the exact shape of the returned portfolio data is unknown. The endpoint accepts POST requests and returns application/json.","tags":[],"capabilities":["portfolio-holdings","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio data","holdings API","investment holdings","crypto portfolio","asset allocation","portfolio positions","x402 finance API"],"warnings":["No response schema documented—returned data structure is unknown","No request body schema documented—unclear what parameters POST accepts","All documentation pages (docs, API, pricing, README) show only 'Connect wallet' with no content","Specific portfolio (ID 63) purpose and data source are undocumented","Provider legitimacy and data accuracy cannot be verified from available materials"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/63/holdings","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/63/holdings","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation of the request body format, response schema, or what data portfolio 63 actually contains. The docs pages are empty beyond a wallet connect 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'price':107,144 'prompt':154 'protocol':13,29,55 'provid':37,83 'rate':116 'readm':146 'request':49,60,72,186 'requir':56 'respons':162 'return':177,188 'schema':163 'settl':14,30 'shape':174 'show':150 'spars':140 'specif':161 'technic':158 'unit':76 'unknown':181 'usdc':16,32,61,78,132 'usdc-settlement' 'use':51,131 'util':100 'various':89 'via':11,27,46,124 'wallet':153 'x':128 'x-payment':127 'x402':12,28,53,126 'x402 finance API' 'x402-payment'","prices":[{"id":"8316243e-57b4-4b05-a9e8-4e6c970d3ac8","listingId":"a4ce7d67-d321-4540-a7e9-19a2d1c1d4ea","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 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