{"id":"c971d85a-9d1d-4aa7-8b41-a1f0ea49d1e3","shortId":"DcRvwK","kind":"x402","title":"x402-gated portfolio endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated portfolio endpoint on Base, pay-per-request with USDC.","description":"This endpoint at `/api/v1/portfolios/68` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. The specific `/portfolios/68` resource is listed under \"Premium API Access\" but its exact data payload is not documented in the available crawl material. It accepts POST requests and returns `application/json`.\n\nPayment is settled on the Base network using USDC (contract `0x8335…2913`) via the x402 exact-payment scheme. The maximum amount required per call is 20,000 base units, which at 6 decimals equals $0.02 USD — consistent with the site's advertised flat $0.02/request pricing across all endpoints. No API keys, subscriptions, or rate limits are required; callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, and more — all at the same $0.02/request price point. Documentation beyond the landing page is extremely sparse (docs, pricing, and README pages all render only a \"Connect wallet\" prompt), so the exact request/response schema for this portfolio endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-api","portfolio-data"],"categories":["finance","data"],"synonyms":["portfolio API","premium API access","lowpaymentfee","x402 portfolio","pay-per-call API","USDC micropayment API","Base network API"],"warnings":["No documentation available — docs, pricing, and README pages all show only 'Connect wallet'","Request body schema for POST is unknown; no OpenAPI spec provided","Response schema and actual data content of /portfolios/68 are undocumented","The specific meaning of 'portfolios/68' (what portfolio, whose data) is not explained anywhere in crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/68","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/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation of the request body schema, response format, or what 'portfolios/68' actually returns. Docs pages are empty. This is effectively a stub 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'/portfolios/68':62 '/request':135,189 '0.02':125,134,188 '000':117 '0x8335':100 '20':116 '2913':101 '6':122 'Base network API' 'USDC micropayment API' 'accept':84 'access':69 'across':137 'addit':168 'advertis':132,167 'ai/ml':53 'amount':111 'analysi':172 'analyt':52 'api':49,68,141 'application/json':89 'attach':151 'avail':80 'base':7,20,95,118 'base-network' 'beyond':193 'broader':164 'call':48,114 'caller':149 'classif':175 'collect':40 'connect':209 'consist':127 'contract':99 'crawl':81 'data':51,56,73 'decim':123 'doc':200 'document':77,192 'embed':176 'endpoint':5,18,28,139,169,220 'equal':124 'exact':72,106,214 'exact-pay':105 'exchang':179 'extrem':198 'feed':178 'finance/web3':55 'flat':133 'gate':3,16 'geocod':181 'header':156 'infer':54 'infrastructur':58 'json-api' 'key':142 'land':195 'limit':146 'list':65 'lowpaymentfee' 'lowpaymentfee.com':35,165 'materi':82 'maximum':110 'network':96 'offer':38 'page':196,204 'part':32 'pay':9,22,46 'pay-per-cal':45 'pay-per-call API' 'pay-per-request':8,21 'payload':74 'payment':90,107,155,161 'per':10,23,47,113 'platform':36,166 'point':191 'portfolio':4,17,219 'portfolio API' 'portfolio-data' 'post':85 'premium':67 'premium API access' 'price':136,177,190,201 'prompt':211 'proof':162 'protocol':44 'rate':145,180 'readm':203 'render':206 'request':11,24,86 'request/response':215 'requir':112,148 'resourc':63 'return':88 'schema':216 'scheme':108 'sentiment':171 'settl':92 'simpli':150 'site':130 'span':50 'spars':199 'specif':61 'subscript':143 'summar':174 'text':173 'unit':119 'unknown':222 'usd':126 'usdc':13,26,98 'usdc-settlement' 'use':97 'util':59 'valid':159 'via':102 'wallet':210 'x':154 'x-payment':153 'x402':2,15,43,104,160 'x402 portfolio' 'x402-gated':1,14 'x402-payment' 'x402-protocol':42","prices":[{"id":"97d1e1ac-be9b-420c-ae24-1b1e22295b95","listingId":"c971d85a-9d1d-4aa7-8b41-a1f0ea49d1e3","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/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:19.432Z"}],"sources":[{"listingId":"c971d85a-9d1d-4aa7-8b41-a1f0ea49d1e3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/68","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:19.432Z","lastSeenAt":"2026-04-27T18:36:24.672Z"}],"details":{"listingId":"c971d85a-9d1d-4aa7-8b41-a1f0ea49d1e3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/68 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/68"},{"claim":"The platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/68"}],"useCases":["Fetching portfolio data on-demand without API key registration","Agent-driven portfolio lookups settled instantly via x402 USDC micropayments","Integrating low-friction paid data endpoints into automated workflows"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments on Base","Users who need occasional portfolio data without committing to a subscription"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.69Z"},"updatedAt":"2026-04-27T18:36:24.672Z"}}