{"id":"8ac4009b-b6e7-4f3e-b095-26ef63bb573e","shortId":"qP3Lqu","kind":"x402","title":"Pay-per-call portfolio data endpoint on Base network via x402, settled in USDC.","tagline":"Pay-per-call portfolio data endpoint on Base network via x402, settled in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" to portfolio data at the path /api/v1/portfolios/90. It is part of a broader platform offering various pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities—all settled via the x402 protocol on the Base network using USDC.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is settled on-chain to a specified address using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base). The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals). The platform advertises no API keys, no rate limits, and instant access with a flat $0.02 per request pricing model.\n\nThe specific response schema for /api/v1/portfolios/90 is not documented in the crawled material. The endpoint's description is simply \"Premium API Access\" and the response MIME type is application/json. The broader site lists many endpoints but provides no detailed documentation for any of them—docs, pricing, and README pages all just show a \"Connect wallet\" prompt. The exact data returned by this portfolio endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-data","pay-per-request","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["portfolio API","x402 portfolio","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto payment API"],"warnings":["No documentation available for this specific endpoint's request or response schema","All doc/pricing/README pages return only a 'Connect wallet' prompt with no actual content","The purpose and data returned by /api/v1/portfolios/90 is entirely undocumented","This endpoint path (/api/v1/portfolios/90) is not listed on the site's main API catalog"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/90","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/90","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 via a valid 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no documentation of request parameters, response schema, or what 'portfolios/90' actually returns. The docs pages are empty 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'0.02':124,144 '000':117 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':106 '20':116 '6':127 'Base network API' 'USDC micropayment API' 'accept':90 'access':38,140,170 'address':102 'advertis':131 'ai/ml':63 'amount':111 'analyt':62 'api':37,59,133,169 'application/json':177 'base':9,24,77,108,118 'base-network' 'broader':51,179 'call':4,19,114 'chain':98 'challeng':83 'confirm':84 'connect':202 'contract':105 'crawl':160 'crypto payment API' 'data':6,21,41,61,207 'decim':128 'descript':165 'detail':187 'doc':193 'document':157,188 'endpoint':7,22,32,86,163,183,212 'equal':123 'exact':206 'finance/web3':65 'flat':143 'infer':64 'infrastructur':67 'instant':139 'json-response' 'key':134 'limit':137 'list':181 'live':88 'lowpaymentfee' 'lowpaymentfee.com':34 'mani':182 'materi':161 'maximum':110 'mime':174 'model':148 'network':10,25,78 'no-api-key' 'offer':53 'on-chain':96 'page':197 'part':48 'path':44 'pay':2,17,56 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':55 'payment':93 'per':3,18,57,113,145 'platform':52,130 'portfolio':5,20,40,211 'portfolio API' 'portfolio-data' 'post':91 'premium':36,168 'price':147,194 'prompt':204 'protocol':74 'provid':35,185 'rate':136 'readm':196 'request':58,92,146 'requir':112 'respons':151,173 'return':208 'schema':152 'settl':13,28,70,95 'show':200 'simpli':167 'site':180 'span':60 'specif':150 'specifi':101 'type':175 'unit':119 'unknown':214 'usdc':15,30,80,104,121,125 'usdc-settlement' 'use':79,103,126 'util':68 'various':54 'via':11,26,71 'wallet':203 'x402':12,27,73,82 'x402 portfolio' 'x402-payment'","prices":[{"id":"dcd70728-e770-4046-b3c2-3adf7f25006b","listingId":"8ac4009b-b6e7-4f3e-b095-26ef63bb573e","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/90","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:38.673Z"}],"sources":[{"listingId":"8ac4009b-b6e7-4f3e-b095-26ef63bb573e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/90","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:38.673Z","lastSeenAt":"2026-04-27T14:05:19.407Z"}],"details":{"listingId":"8ac4009b-b6e7-4f3e-b095-26ef63bb573e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/90 \\\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 a 402 challenge requiring USDC payment on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/portfolios/90"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/90"}],"useCases":["Fetching portfolio data without needing an API key or subscription","Programmatic access to portfolio information with per-request USDC micropayments","Agent-driven portfolio queries settled on Base L2"],"bestFor":["Developers wanting keyless, pay-as-you-go API access","AI agents that can settle x402 payments on Base","Users who prefer on-chain micropayments over subscriptions"],"notFor":["Users needing detailed API documentation before integrating","High-volume consumers who want bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.708Z"},"updatedAt":"2026-04-27T14:05:19.407Z"}}