{"id":"cc0f8a66-a2fe-4248-ba2d-36ca1f327f0a","shortId":"Npbu7U","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 lowpaymentfee.com provides access to a specific portfolio resource (portfolio ID 87) via the x402 payment protocol. The endpoint is live and returns a standard x402 challenge requiring payment in USDC on the Base network. The price per request is $0.02 (20,000 base units of USDC with 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid payment proof to access the resource.\n\nThe provider lowpaymentfee.com hosts a broader suite of pay-per-call APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request and settle on the Base network using USDC.\n\nHowever, the specific endpoint `/api/v1/portfolios/87` is not listed on the provider's landing page among the advertised API categories. Its exact response schema and the nature of the \"portfolio\" data it returns are undocumented. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional documentation. As a result, the actual content and structure of the response for this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","portfolio-data","pay-per-request","no-api-key","json-response"],"categories":["data","finance"],"synonyms":["portfolio API","x402 portfolio","pay-per-call data","USDC API","Base network API","lowpaymentfee","micropayment API"],"warnings":["The /api/v1/portfolios/87 endpoint is not listed among the provider's advertised APIs on the landing page.","No documentation exists for this endpoint — response schema, request body format, and data content are all unknown.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no useful content.","The nature of 'portfolio' data is unspecified; callers cannot know what they are paying for without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/87","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/87","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, but there is no documentation, no response schema, and the specific /portfolios/87 resource is not mentioned on the provider's landing page. The docs/pricing/API pages are all blank beyond a wallet connect prompt. The actual data returned is completely 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'0.02':10,24,71,151 '000':73 '20':72 '6':79 '87':42 'Base network API' 'USDC API' 'access':34,103 'actual':217 'addit':211 'advertis':178 'ai/ml':122 'among':176 'analysi':125 'analyt':121 'api':82,118,179,200 'attach':91 'base':8,22,64,74,158 'base-network' 'broader':111 'call':117 'caller':89 'categori':180 'challeng':57 'classif':127 'connect':206 'content':218 'convers':144 'data':5,19,120,191 'decim':80 'doc':197 'document':212 'embed':128 'endpoint':6,20,30,49,147,165,226 'estim':138 'exact':182 'exchang':133 'feed':132 'financ':129 'gas':137 'gate':3,17 'generat':145 'geocod':142 'header':96 'host':109 'howev':162 'id':41 'infer':123 'infrastructur':140 'json-response' 'key':83 'land':174 'limit':86 'list':149,169 'live':51 'lowpaymentfee' 'lowpaymentfee.com':32,108 'micropayment API' 'natur':187 'network':65,159 'no-api-key' 'page':175,201 'pay':9,23,115 'pay-per-cal':114 'pay-per-call data' 'pay-per-request' 'payment':46,59,95,100 'per':11,25,68,116,152 'portfolio':4,18,38,40,190 'portfolio API' 'portfolio-data' 'price':67,131,198 'prompt':208 'proof':101 'protocol':47 'provid':33,107,172 'quot':136 'rate':85,134 'remain':227 'render':203 'request':12,26,69,153 'requir':58,88 'resourc':39,105 'respons':183,223 'result':215 'return':53,193 'schema':184 'sentiment':124 'settl':155 'simpli':90 'span':119 'specif':37,164 'standard':55 'structur':220 'suit':112 'summar':126 'token':135 'undocu':195 'unit':75 'unknown':228 'usdc':14,28,61,77,161 'usdc-settlement' 'use':160 'util':141 'valid':99,143 'via':43 'wallet':207 'web3':130 'x':94 'x-payment':93 'x402':2,16,45,56 'x402 portfolio' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"fa7e6feb-2e11-494b-9cad-d67f45c6cdf4","listingId":"cc0f8a66-a2fe-4248-ba2d-36ca1f327f0a","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/87","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:33.860Z"}],"sources":[{"listingId":"cc0f8a66-a2fe-4248-ba2d-36ca1f327f0a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/87","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:33.860Z","lastSeenAt":"2026-04-27T15:34:26.260Z"}],"details":{"listingId":"cc0f8a66-a2fe-4248-ba2d-36ca1f327f0a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/87 \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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 402 x402 challenge requiring USDC payment on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/portfolios/87"},{"claim":"The provider advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/portfolios/87"},{"claim":"The docs, pricing, API, and README pages show only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving portfolio data (ID 87) with per-request USDC micropayments","Integrating pay-per-call data access into autonomous agents on Base","Accessing premium data without API key management"],"bestFor":["Agents or services that can settle x402 payments in USDC on Base","Use cases requiring keyless, per-request API access","Developers experimenting with x402 payment protocol integrations"],"notFor":["Users who need detailed documentation or response schema before integrating","High-volume consumers who prefer subscription-based pricing over per-call payments","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.01Z"},"updatedAt":"2026-04-27T15:34:26.260Z"}}