{"id":"f3f17d6b-50ba-4eee-b47c-da856afaeec8","shortId":"tVbeuZ","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 `/api/v1/portfolios/71` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific `/portfolios/71` resource is listed under \"Premium API Access\" but its exact data payload is not documented beyond the generic description. All endpoints on the platform share the same pricing model: $0.02 per request, settled in USDC on the Base network.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with `maxAmountRequired` of 20000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is made via the x402 `exact` scheme by including an `X-PAYMENT` header. There are no API keys, rate limits, or subscription commitments — each call is independently paid. The response MIME type is `application/json` and the endpoint accepts POST requests.\n\nDocumentation on the site is extremely sparse. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema, and no example payloads available. The actual data returned by the `/portfolios/71` resource is unknown — it could be a financial portfolio, a curated dataset, or something else entirely. Without documentation or sample responses, integrators will need to make a paid request to discover the response format.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-api","no-api-key","portfolio-data"],"categories":["finance","data"],"synonyms":["portfolio API","x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium data access","crypto-paid API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.","The response schema for /api/v1/portfolios/71 is completely unknown; no examples or field descriptions exist.","The meaning of 'portfolios/71' (what data it returns) is not documented anywhere in the crawled material.","The site lists many endpoint categories but this specific endpoint does not appear in any of the listed categories on the homepage."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/71","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/71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a title, and no example payloads. The actual purpose of '/portfolios/71' is undocumented, making this effectively a stub 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'/portfolios/71':69,225 '0.02':9,26,99,137 '0x8335':129 '20000':124 '2913':130 '402':120 '6':133 'Base network API' 'USDC micropayment API' 'accept':177 'access':76 'actual':220 'addit':203 'ai/ml':61 'analyt':60 'api':15,32,57,75,156,190 'application/json':173 'avail':218 'base':7,24,107,125,132 'base-network' 'beyond':85 'call':164 'challeng':118 'collect':48 'commit':162 'connect':198 'content':205 'could':230 'crypto-paid API' 'curat':236 'data':59,80,221 'dataset':237 'decim':134 'descript':88 'discov':256 'doc':188 'document':84,180,243 'els':240 'endpoint':5,22,36,90,110,176 'entir':241 'equal':136 'exact':79,144 'exampl':216 'extrem':185 'finance/web3':63 'financi':233 'format':259 'gate':3,20 'generic':87 'header':152 'http':119 'includ':147 'independ':166 'infer':62 'infrastructur':65 'integr':247 'json-api' 'key':16,33,157 'limit':159 'list':72 'live':112 'lowpaymentfee' 'lowpaymentfee.com':43 'made':140 'make':251 'maxamountrequir':122 'mime':170 'model':98 'need':17,34,249 'network':108 'no-api-key' 'offer':46 'openapi':209 'page':193 'paid':167,253 'part':40 'pay':8,25,54 'pay-per-call API' 'pay-per-request':53 'payload':81,217 'payment':138,151 'per':10,27,55,100 'platform':44,93 'portfolio':4,21,234 'portfolio API' 'portfolio-data' 'post':178 'premium':74 'premium data access' 'price':97,189 'prompt':200 'protocol':52 'rate':158 'readm':192 'render':195 'request':11,28,56,101,179,254 'request/response':212 'resourc':70,226 'respons':169,246,258 'return':114,222 'sampl':245 'schema':213 'scheme':145 'settl':102 'share':94 'site':183 'someth':239 'span':58 'spars':186 'spec':210 'specif':68 'subscript':161 'technic':204 'type':171 'unit':126 'unknown':228 'usdc':13,30,104,128 'usdc-settlement' 'util':66 'valid':116 'via':141 'wallet':199 'without':242 'x':150 'x-payment':149 'x402':2,19,51,117,143 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':50","prices":[{"id":"45420583-eab8-477d-96a0-55dcf663451c","listingId":"f3f17d6b-50ba-4eee-b47c-da856afaeec8","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/71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:20.033Z"}],"sources":[{"listingId":"f3f17d6b-50ba-4eee-b47c-da856afaeec8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/71","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:20.033Z","lastSeenAt":"2026-04-27T18:36:24.706Z"}],"details":{"listingId":"f3f17d6b-50ba-4eee-b47c-da856afaeec8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/71 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/71"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/71"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching portfolio data without managing API keys or subscriptions","Agent-driven data retrieval with per-request USDC micropayments on Base","Programmatic access to premium content behind x402 payment gates"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents with Base USDC wallets needing on-demand data","Prototyping integrations without rate limits or subscription overhead"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.657Z"},"updatedAt":"2026-04-27T18:36:24.706Z"}}