{"id":"ff70ecdc-7449-4504-b0b7-7563dfa5a6ac","shortId":"5qqS9t","kind":"x402","title":"x402-gated portfolio data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated portfolio data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at `/api/v1/portfolios/94` 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 data, and infrastructure utilities. The specific `/portfolios/94` resource is listed under \"Premium API Access\" but its exact data payload is not documented in the available crawl material. The endpoint is live and returns a valid x402 challenge on POST.\n\nPayment is settled on the Base network using USDC (contract `0x8335…2913`) via the x402 \"exact\" scheme. The `maxAmountRequired` is 20,000 base units, which at 6 decimals equals $0.02 per request — consistent with the site's uniform $0.02/request pricing across all endpoints. No API keys are required; access is granted by attaching a valid `X-PAYMENT` header with a signed payment proof. The platform advertises no rate limits and instant access.\n\nBecause the crawled documentation pages (`/docs`, `/api`, `/pricing`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content, the actual response schema and the meaning of \"portfolios/94\" remain unknown. The endpoint could return financial portfolio data, but this is speculative. Agents should treat this as a generic paid JSON endpoint until better documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key"],"categories":["finance","data"],"synonyms":["portfolio API","x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","premium data endpoint"],"warnings":["No documentation available — all doc pages (/docs, /api, /pricing, /README) returned only a 'Connect wallet' stub.","The exact data returned by /api/v1/portfolios/94 is unknown; 'Premium API Access' is the only description provided.","No OpenAPI spec, no output schema beyond the x402 challenge metadata, and no example responses are available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/94","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/94","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no response schema, no example payloads, and the purpose of '/portfolios/94' is unexplained. All doc pages returned only 'Connect wallet' with no 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'/api/v1/portfolios/94':32 '/docs':176 '/portfolios/94':64 '/pricing':178 '/readme':179 '/request':136 '0.02':10,24,126,135 '000':118 '0x8335':107 '20':117 '2913':108 '6':123 'Base network API' 'USDC micropayment API' 'access':71,146,170 'across':138 'actual':192 'advertis':164 'agent':213 'ai/ml':55 'analyt':54 'api':51,70,142 'attach':150 'avail':82 'base':8,22,102,119 'base-network' 'better':224 'challeng':94 'collect':42 'connect':184 'consist':129 'content':190 'contract':106 'could':204 'crawl':83,173 'data':5,19,53,58,75,208 'decim':124 'document':79,174,225 'endpoint':6,20,30,86,140,203,222 'equal':125 'exact':74,112 'finance/web3':57 'financi':206 'gate':3,17 'generic':219 'grant':148 'header':156 'infer':56 'infrastructur':60 'instant':169 'json':221 'json-response' 'key':143 'limit':167 'list':67 'live':88 'lowpaymentfee' 'lowpaymentfee.com':37 'materi':84 'maxamountrequir':115 'mean':197 'network':103 'no-api-key' 'offer':40 'page':175 'paid':220 'part':34 'pay':9,23,48 'pay-per-call API' 'pay-per-request':47 'payload':76 'payment':97,155,160 'per':11,25,49,127 'platform':38,163 'portfolio':4,18,207 'portfolio API' 'portfolios/94':199 'post':96 'premium':69 'premium data endpoint' 'price':137 'prompt':186 'proof':161 'protocol':46 'rate':166 'remain':200 'request':12,26,50,128 'requir':145 'resourc':65 'respons':193 'return':90,181,205 'schema':194 'scheme':113 'settl':99 'sign':159 'site':132 'span':52 'specif':63 'specul':212 'substant':189 'surfac':226 'treat':215 'uniform':134 'unit':120 'unknown':201 'usdc':14,28,105 'usdc-settlement' 'use':104 'util':61 'valid':92,152 'via':109 'wallet':185 'x':154 'x-payment':153 'x402':2,16,45,93,111 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"e522234c-d22f-472b-837e-08db529f947f","listingId":"ff70ecdc-7449-4504-b0b7-7563dfa5a6ac","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/94","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:45.895Z"}],"sources":[{"listingId":"ff70ecdc-7449-4504-b0b7-7563dfa5a6ac","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/94","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:45.895Z","lastSeenAt":"2026-04-27T12:34:56.554Z"}],"details":{"listingId":"ff70ecdc-7449-4504-b0b7-7563dfa5a6ac","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/94 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed_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 valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base network.","source_url":"https://lowpaymentfee.com/api/v1/portfolios/94"},{"claim":"The platform advertises $0.02/request pricing 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/94"}],"useCases":["Fetching portfolio-related data via a single micropayment without subscription or API key","Integrating pay-per-request data access into autonomous agent workflows","Programmatic access to premium content gated behind x402 payment challenges"],"bestFor":["Agents or scripts that need one-off data fetches without managing API keys","Developers experimenting with x402 payment protocol integrations","Low-volume consumers who prefer per-call pricing over subscriptions"],"notFor":["High-volume bulk data retrieval where per-call costs add up quickly","Users who need detailed documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.42Z"},"updatedAt":"2026-04-27T12:34:56.554Z"}}