{"id":"d54c6ff3-f446-4d7c-8cca-960de03425e0","shortId":"J8hSnj","kind":"x402","title":"x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys needed.","tagline":"x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys needed.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" resource at the path `/api/v1/portfolios/83`. It is part of a broader platform that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated via the x402 payment protocol on the Base network.\n\nThe specific `/api/v1/portfolios/83` endpoint accepts POST requests and returns JSON. Payment is settled in USDC (contract `0x8335…2913` on Base) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). There are no API keys, no rate limits, and no subscription commitments — each call is paid individually via the x402 `X-PAYMENT` header. The payment timeout is 300 seconds.\n\nThe broader lowpaymentfee.com platform advertises a uniform $0.02/request pricing across all its endpoints. However, documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the exact schema of the request body and the structure of the portfolio data returned are unknown. The endpoint is confirmed live via a valid 402 challenge response.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","portfolio-data"],"categories":["finance","data"],"synonyms":["portfolio API","x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto payment API"],"warnings":["No documentation available — all doc/pricing/README pages return only 'Connect wallet' with no content.","The request body schema and response format for /api/v1/portfolios/83 are completely unknown.","The meaning of 'portfolios/83' (what portfolio, what data) is not documented anywhere.","This endpoint is not listed on the provider's own landing page catalog, raising questions about its status."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/83","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/83","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 x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation for this specific endpoint — no request/response schema, no examples, and all doc pages are empty. The purpose of 'portfolios/83' is entirely opaque beyond the generic 'Premium API Access' 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'/request':161 '0.02':9,26,118,160 '000':113 '0x8335':103 '20':112 '2913':104 '300':151 '402':210 '6':121 'Base network API' 'USDC micropayment API' 'accept':91 'access':43 'across':163 'advertis':157 'ai/ml':69 'amount':110 'analyt':68 'api':15,32,42,64,126 'base':7,24,85,106,114 'base-network' 'beyond':169 'bodi':191 'broader':54,154 'call':63,136 'challeng':211 'commit':134 'confirm':205 'connect':182 'contract':102 'crypto payment API' 'data':67,72,198 'decim':122 'document':168 'dozen':58 'empti':175 'endpoint':5,22,36,65,90,166,203 'equal':117 'essenti':174 'exact':186 'finance/web3':71 'gate':3,20,77 'header':146 'howev':167 'individu':139 'infer':70 'infrastructur':74 'json':96 'json-response' 'key':16,33,127 'land':171 'limit':130 'live':206 'lowpaymentfee' 'lowpaymentfee.com':38,155 'maximum':109 'need':17,34 'network':86 'no-api-key' 'offer':57 'page':172,179 'paid':138 'part':51 'path':47 'pay':8,25,61 'pay-per-cal':60 'pay-per-call API' 'pay-per-request' 'payment':81,97,145,148 'per':10,27,62 'platform':55,156 'portfolio':4,21,197 'portfolio API' 'portfolio-data' 'post':92 'premium':41 'price':162 'protocol':82 'provid':39 'rate':129 'request':11,28,93,190 'resourc':44 'respons':212 'return':95,199 'schema':187 'second':152 'settl':99 'show':181 'span':66 'specif':88 'structur':194 'sub':178 'sub-pag':177 'subscript':133 'timeout':149 'uniform':159 'unit':115 'unknown':201 'usdc':13,30,101,119 'usdc-settlement' 'use':120 'util':75 'valid':209 'via':78,140,207 'wallet':183 'x':144 'x-payment':143 'x402':2,19,80,142 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"c94e0abb-dd7b-408b-a6ad-fc357cf8e74e","listingId":"d54c6ff3-f446-4d7c-8cca-960de03425e0","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/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:31.461Z"}],"sources":[{"listingId":"d54c6ff3-f446-4d7c-8cca-960de03425e0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/83","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:31.461Z","lastSeenAt":"2026-04-27T15:34:26.205Z"}],"details":{"listingId":"d54c6ff3-f446-4d7c-8cca-960de03425e0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/83 \\\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 with x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/portfolios/83"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/83"},{"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":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching portfolio data (ID 83) on demand with per-request USDC micropayments","Agent-driven data retrieval without pre-registration or API key management","Integrating pay-as-you-go financial data into automated workflows"],"bestFor":["Developers wanting keyless, pay-per-call API access on Base","AI agents that can settle x402 payments autonomously","Users who need occasional portfolio lookups without subscription overhead"],"notFor":["High-volume consumers who need bulk/subscription pricing","Users who need detailed API documentation or client SDKs before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.056Z"},"updatedAt":"2026-04-27T15:34:26.205Z"}}