{"id":"afd1c468-6d31-48f9-93fc-bede741a3243","shortId":"WtRmev","kind":"x402","title":"x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys needed.","tagline":"x402-gated portfolio endpoint on Base, pay $0.02 per request in USDC — no API keys needed.","description":"This endpoint at lowpaymentfee.com provides a \"Premium API Access\" resource at `/api/v1/portfolios/98`. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated via the x402 payment protocol on the Base network. Each request costs $0.02 in USDC (USD Coin), settled on-chain with no API keys, rate limits, or subscriptions required.\n\nThe specific `/api/v1/portfolios/98` endpoint accepts POST requests and returns `application/json`. Based on the URL pattern, it likely returns portfolio-related data (possibly financial or analytical), but no detailed documentation or response schema was found in the crawl. The platform's docs, pricing, and API pages all rendered as minimal \"Connect wallet\" stubs, so the exact input parameters and response structure remain unknown.\n\nThe x402 challenge is live and well-formed: it advertises a maxAmountRequired of 20000 base units of USDC (6 decimals → $0.02), payable to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, with a 300-second timeout. The platform lists uniform $0.02 pricing across all its endpoints.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","portfolio-data","json-api","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["portfolio API","x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No API documentation available — docs, pricing, and API pages all render as 'Connect wallet' with no content.","No request parameters or response schema documented for /api/v1/portfolios/98.","The exact nature of the 'portfolio' data returned is unknown and inferred only from the URL path.","No OpenAPI spec or ai-plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/98","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/98","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documented request/response format, and the docs pages are empty stubs. The specific purpose of /api/v1/portfolios/98 is not explained anywhere, making this effectively a stub 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'0.02':9,26,87,189,205 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':193 '20000':182 '300':198 '6':187 'Base network API' 'USDC micropayment API' 'accept':109 'access':43 'across':207 'address':192 'advertis':178 'ai/ml':66 'analyt':65,130 'api':15,32,42,61,98,149 'application/json':114 'base':7,24,82,115,183,195 'broader':52 'call':60 'chain':95 'challeng':170 'coin':91 'connect':155 'cost':86 'crawl':142 'crypto-paid API' 'data':64,69,126 'decim':188 'detail':133 'doc':146 'document':134 'dozen':55 'endpoint':5,22,36,62,108,210 'exact':160 'finance/web3':68 'financi':128 'form':176 'found':139 'gate':3,20,74 'infer':67 'infrastructur':71 'input':161 'json-api' 'key':16,33,99 'like':121 'limit':101 'list':203 'live':172 'lowpaymentfee' 'lowpaymentfee.com':38 'maxamountrequir':180 'minim':154 'need':17,34 'network':83 'no-api-key' 'no-rate-limit' 'offer':54 'on-chain':93 'page':150 'paramet':162 'part':49 'pattern':119 'pay':8,25,58 'pay-per-cal':57 'pay-per-call API' 'pay-per-request' 'payabl':190 'payment':78 'per':10,27,59 'platform':53,144,202 'portfolio':4,21,124 'portfolio API' 'portfolio-data' 'portfolio-rel':123 'possibl':127 'post':110 'premium':41 'premium API access' 'price':147,206 'protocol':79 'provid':39 'rate':100 'relat':125 'remain':166 'render':152 'request':11,28,85,111 'requir':104 'resourc':44 'respons':136,164 'return':113,122 'schema':137 'second':199 'settl':92 'span':63 'specif':106 'structur':165 'stub':157 'subscript':103 'timeout':200 'uniform':204 'unit':184 'unknown':167 'url':118 'usd':90 'usdc':13,30,89,186 'usdc-base' 'util':72 'via':75 'wallet':156 'well':175 'well-form':174 'x402':2,19,77,169 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"4f21c927-61c3-456c-bcf5-0b87aba50639","listingId":"afd1c468-6d31-48f9-93fc-bede741a3243","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/98","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":"afd1c468-6d31-48f9-93fc-bede741a3243","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/98","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:45.895Z","lastSeenAt":"2026-04-27T12:34:56.550Z"}],"details":{"listingId":"afd1c468-6d31-48f9-93fc-bede741a3243","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/portfolios/98 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform charges $0.02 per request with no API keys, rate limits, or minimums.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base with a 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/portfolios/98"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/portfolios/98"},{"claim":"The platform offers endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching portfolio data on-demand without managing API keys or subscriptions","Integrating pay-per-call financial data into autonomous agent workflows","Accessing gated API resources using on-chain USDC micropayments on Base"],"bestFor":["Agents or developers who want keyless, pay-per-request API access","Users already holding USDC on Base who need low-friction data endpoints","Prototyping integrations where subscription commitments are undesirable"],"notFor":["High-volume consumers who need bulk pricing or rate-limit guarantees","Users who need detailed API documentation or response schema before integrating","Anyone without USDC on Base or unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.42Z"},"updatedAt":"2026-04-27T12:34:56.550Z"}}