{"id":"e69afd2b-7026-47f6-b0e9-135fd3f2a988","shortId":"tMVzg2","kind":"x402","title":"x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" resource at `/api/v1/portfolios/81` via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a variety of data, AI, finance, and utility APIs all priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific `/api/v1/portfolios/81` endpoint accepts POST requests and returns JSON. Payment is handled inline via the x402 protocol: callers send an `X-PAYMENT` header containing a signed payment of up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals) to the provider's address on Base. There are no API keys, no rate limits, and no subscription commitments — each call is independently paid.\n\nThe broader lowpaymentfee.com platform also offers endpoints for analytics/metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. However, the specific data returned by `/api/v1/portfolios/81` is not documented in the crawled material; the endpoint name suggests portfolio-related data but no schema or example response was found.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-pricing","json-response","post-method","no-api-key","portfolio-data"],"categories":["finance","data"],"synonyms":["portfolio API","lowpaymentfee","x402 portfolio","USDC micropayment API","pay-per-call API","Base network API","crypto payment API"],"warnings":["No documentation found for the specific /api/v1/portfolios/81 endpoint — unclear what data it returns","All documentation pages (docs, api, pricing, README) returned only 'Connect wallet' with no substantive content","No OpenAPI spec or response schema available","The endpoint path suggests portfolio data but the exact nature and structure of the response is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/81","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/81","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation on what `/api/v1/portfolios/81` actually returns — no response schema, no example, and no description beyond the generic 'Premium API Access' label. The docs, pricing, and API pages all returned only 'Connect wallet' with no useful 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'/request':193 '0.02':9,26,77,126,192 '000':120 '20':119 '6':130 'Base network API' 'USDC micropayment API' 'accept':91 'access':43 'address':136 'ai':69 'also':160 'analysi':170 'analytics/metrics':164 'api':15,32,42,73,142 'base':7,24,85,121,138 'broader':157 'call':152 'caller':105 'classif':173 'commit':150 'contain':112 'convers':185 'crawl':208 'crypto payment API' 'data':68,166,199,217 'decim':131 'document':205 'embed':174 'endpoint':5,22,36,57,90,162,211 'estim':182 'exampl':222 'exchang':177 'export':167 'feed':176 'financ':70 'found':225 'gas':181 'gate':3,20 'generat':187 'geocod':183 'handl':99 'header':111 'host':64 'howev':196 'i.e':125 'independ':154 'inlin':100 'insight':168 'json':96 'json-response' 'key':16,33,143 'limit':146 'lowpaymentfee' 'lowpaymentfee.com':38,61,158 'mani':56 'materi':209 'name':212 'network':86 'no-api-key' 'offer':58,161 'one':54 'paid':155 'pay':8,25 'pay-per-call API' 'payment':50,97,110,115 'per':10,27,78 'per-request-pricing' 'platform':62,159 'point':195 'portfolio':4,21,215 'portfolio API' 'portfolio-data' 'portfolio-rel':214 'post':92 'post-method' 'premium':41 'price':75,175,194 'protocol':51,104 'provid':39,134 'quot':180 'rate':145,178 'relat':216 'report':165 'request':11,28,79,93 'requir':17,34 'resourc':44 'respons':223 'return':95,200 'schema':220 'send':106 'sentiment':169 'settl':80 'sign':114 'sinc':127 'specif':88,198 'subscript':149 'suggest':213 'summar':172 'text':171 'token':179 'unit':122 'usdc':13,30,82,124,128 'usdc-base' 'use':129 'util':72 'valid':184 'varieti':66 'via':47,101 'x':109 'x-payment':108 'x402':2,19,49,103 'x402 portfolio' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"28f2e0d5-532c-48c8-8a8a-3af9c24ad07f","listingId":"e69afd2b-7026-47f6-b0e9-135fd3f2a988","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:26.046Z"}],"sources":[{"listingId":"e69afd2b-7026-47f6-b0e9-135fd3f2a988","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:26.046Z","lastSeenAt":"2026-04-27T17:05:05.078Z"}],"details":{"listingId":"e69afd2b-7026-47f6-b0e9-135fd3f2a988","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/81 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/81"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching portfolio data on a pay-per-request basis without managing API keys or subscriptions","Integrating low-cost data endpoints into autonomous agents that settle payments in USDC on Base","Accessing financial or portfolio information with instant, permissionless access"],"bestFor":["Agents or developers who want keyless, pay-per-call API access","Users who prefer crypto-native micropayments over traditional billing","Low-volume or sporadic consumers who don't want subscription commitments"],"notFor":["High-volume consumers who need bulk pricing or enterprise SLAs","Users who cannot transact in USDC on the Base network","Anyone needing detailed documentation or guaranteed response schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.347Z"},"updatedAt":"2026-04-27T17:05:05.078Z"}}