{"id":"a314cebf-49ed-423c-8c56-90ced52b81d2","shortId":"Axa4ZG","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/79` 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/79` 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. The challenge specifies a 300-second timeout and the response MIME type is `application/json`. The HTTP method is POST.\n\nThe broader lowpaymentfee.com platform advertises no API keys, no rate limits, and instant access. However, documentation is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no explanation of what data the `/portfolios/79` resource actually returns. Without documentation or example responses, the actual utility of this endpoint is unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","portfolio-data"],"categories":["finance","data"],"synonyms":["portfolio API","premium API access","x402 portfolio","lowpaymentfee","pay-per-call API","USDC micropayment API","Base network API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No request or response schema provided; the actual data returned by /portfolios/79 is unknown","No OpenAPI specification or ai-plugin manifest found","The endpoint name 'Premium API Access' is generic and does not describe the resource"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/79","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/79","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 with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a title, and no example payloads. The actual data returned by /portfolios/79 is completely undocumented, making this effectively a stub 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'/portfolios/79':69,224 '0.02':9,26,99,137 '0x8335':129 '20000':124 '2913':130 '300':157 '402':120 '6':133 'Base network API' 'USDC micropayment API' 'access':76,185 'actual':226,234 'advertis':176 'ai/ml':61 'analyt':60 'api':15,32,57,75,178,193 'application/json':166 'base':7,24,107,125,132 'base-network' 'beyond':85 'broader':173 'challeng':118,154 'collect':48 'connect':202 'content':208 'data':59,80,222 'decim':134 'descript':88 'doc':192 'document':84,187,229 'endpoint':5,22,36,90,110,238 'equal':136 'exact':79,144 'exampl':231 'explan':219 'extrem':189 'finance/web3':63 'gate':3,20 'generic':87 'header':152 'howev':186 'http':119,168 'includ':147 'infer':62 'infrastructur':65 'instant':184 'json-response' 'key':16,33,179 'limit':182 'list':72 'live':112 'lowpaymentfee' 'lowpaymentfee.com':43,174 'made':140 'maxamountrequir':122 'method':169 'mime':163 'model':98 'need':17,34 'network':108 'no-api-key' 'offer':46 'openapi':212 'page':197 'part':40 'pay':8,25,54 'pay-per-call API' 'pay-per-request':53 'payload':81 'payment':138,151 'per':10,27,55,100 'platform':44,93,175 'portfolio':4,21 'portfolio API' 'portfolio-data' 'post':171 'premium':74 'premium API access' 'price':97,194 'prompt':204 'protocol':52 'rate':181 'readm':196 'render':199 'request':11,28,56,101 'request/response':215 'resourc':70,225 'respons':162,232 'return':114,227 'schema':216 'scheme':145 'second':158 'settl':102 'share':94 'span':58 'spec':213 'specif':68 'specifi':155 'substant':207 'thin':190 'timeout':159 'type':164 'unclear':240 'unit':126 'usdc':13,30,104,128 'usdc-settlement' 'util':66,235 'valid':116 'via':141 'wallet':203 'without':228 'x':150 'x-payment':149 'x402':2,19,51,117,143 'x402 portfolio' 'x402-gated':1,18 'x402-payment' 'x402-protocol':50","prices":[{"id":"b37d9ff8-c3cf-4c21-b182-b55ad9036021","listingId":"a314cebf-49ed-423c-8c56-90ced52b81d2","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/79","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:36.248Z"}],"sources":[{"listingId":"a314cebf-49ed-423c-8c56-90ced52b81d2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/79","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:36.248Z","lastSeenAt":"2026-04-27T15:34:26.327Z"}],"details":{"listingId":"a314cebf-49ed-423c-8c56-90ced52b81d2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/79 \\\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/79"},{"claim":"All endpoints on the platform are priced at $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/79"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no substantive documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching portfolio data (resource ID 79) via a single paid API call","Integrating pay-per-request data access into agent workflows without managing API keys","Demonstrating x402 protocol payment flows on Base"],"bestFor":["Agents or developers who want key-free, pay-per-call API access","x402-compatible clients on the Base network","Low-volume or exploratory data retrieval without subscription commitments"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone needing to understand the exact response schema before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.909Z"},"updatedAt":"2026-04-27T15:34:26.327Z"}}