{"id":"0bb4140d-4144-4dad-9b0a-8a525e4d60e7","shortId":"FC7tML","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 (ID 84) via the x402 payment protocol. The endpoint is live and returns a 402 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). Payment is made via the x402 \"exact\" scheme to the specified wallet address, with no API keys or rate limits required.\n\nThe broader lowpaymentfee.com platform hosts a variety of pay-per-call API endpoints spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance and Web3 data (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 in USDC. However, this specific listing is for the `/api/v1/portfolios/84` endpoint, which is not described on the site's landing page among the advertised categories. Its exact response payload and purpose are unclear — the description simply reads \"Premium API Access\" with no further documentation.\n\nNo OpenAPI schema, detailed docs, or example responses are available. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. Because of this, the actual data returned by this endpoint cannot be confirmed from the crawl material alone.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","portfolio-data","json-response"],"categories":["finance","data"],"synonyms":["portfolio API","x402 portfolio","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","The /api/v1/portfolios/84 endpoint is not listed among the site's advertised APIs; its purpose is unclear","No OpenAPI or output schema provided beyond basic HTTP method info","Response format and data content are completely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/84","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/84","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 confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no example request/response, and the specific portfolio endpoint is not described anywhere on the site. The purpose and response format are entirely 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'0.02':10,24,69,148 '000':71 '20':70 '402':54 '6':77 '84':41 'Base network API' 'USDC micropayment API' 'access':34,196 'actual':233 'address':91 'advertis':180 'ai/ml':117 'alon':246 'among':178 'analysi':120 'analyt':116 'api':94,112,195,213 'avail':210 'base':8,22,62,72,155 'broader':101 'call':111 'cannot':239 'categori':181 'challeng':55 'classif':122 'confirm':241 'connect':222 'content':228 'convers':141 'crawl':244 'data':5,19,115,127,234 'decim':78 'describ':171 'descript':191 'detail':204 'doc':205,212 'document':200 'embed':123 'endpoint':6,20,30,48,113,144,167,238 'estim':135 'exact':85,183 'exampl':207 'exchang':130 'feed':129 'financ':124 'gas':134 'gate':3,17 'generat':142 'geocod':139 'host':104 'howev':159 'id':40 'infer':118 'infrastructur':137 'json-response' 'key':95 'land':176 'limit':98 'list':146,162 'live':50 'lowpaymentfee' 'lowpaymentfee.com':32,102 'made':81 'materi':245 'network':63,156 'openapi':202 'page':177,217 'pay':9,23,109 'pay-per-cal':108 'pay-per-call API' 'pay-per-request' 'payload':185 'payment':45,57,79 'per':11,25,66,110,149 'platform':103 'portfolio':4,18,38 'portfolio API' 'portfolio-data' 'premium':194 'premium API access' 'price':65,128,214 'prompt':224 'protocol':46 'provid':33 'purpos':187 'quot':133 'rate':97,131 'read':193 'readm':216 'render':219 'request':12,26,67,150 'requir':56,99 'resourc':39 'respons':184,208 'return':52,235 'schema':203 'scheme':86 'sentiment':119 'settl':152 'simpli':192 'site':174 'span':114 'specif':37,161 'specifi':89 'substant':227 'summar':121 'token':132 'unclear':189 'unit':73 'usdc':14,28,59,75,158 'usdc-base' 'util':138 'valid':140 'varieti':106 'via':42,82 'wallet':90,223 'web3':126 'x402':2,16,44,84 'x402 portfolio' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"87055217-8123-4b51-9096-d3f034853474","listingId":"0bb4140d-4144-4dad-9b0a-8a525e4d60e7","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:27.255Z"}],"sources":[{"listingId":"0bb4140d-4144-4dad-9b0a-8a525e4d60e7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/84","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:27.255Z","lastSeenAt":"2026-04-27T17:05:05.084Z"}],"details":{"listingId":"0bb4140d-4144-4dad-9b0a-8a525e4d60e7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/84 \\\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":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/84"},{"claim":"maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/portfolios/84"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching portfolio data on-demand with per-request USDC micropayments","Agent-driven data retrieval without API key management","Programmatic access to portfolio information settled on Base L2"],"bestFor":["Developers or agents wanting keyless, pay-per-call API access","Users comfortable with x402 payment protocol on Base","Scenarios requiring low-friction, no-subscription data access"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume use cases where per-request pricing may add up","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:58.292Z"},"updatedAt":"2026-04-27T17:05:05.084Z"}}