{"id":"ec4f7bd9-f19d-4e42-9a62-99913db440e8","shortId":"4Y8ATr","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 lowpaymentfee.com provides a \"Premium API Access\" resource at `/api/v1/portfolios/62` via the x402 payment protocol. It is live and returns a 402 challenge requiring payment in USDC on the Base network. The maximum amount required per request is 20,000 base units of USDC (6 decimals), which equals $0.02 USD per call. Payment is settled on-chain to the specified wallet address using the \"exact\" payment scheme.\n\nThe provider site lowpaymentfee.com hosts a broader catalog of pay-per-request APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. However, this specific listing is for the `/api/v1/portfolios/62` endpoint, which is not described on the landing page catalog. Its exact response payload and purpose are unclear — the name \"portfolios\" suggests financial portfolio data, but no documentation, schema, or example responses are available.\n\nThe endpoint accepts HTTP POST requests and returns `application/json`. No OpenAPI spec, detailed docs, or example payloads were found during crawling; the docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","portfolio-data"],"categories":["finance","data"],"synonyms":["portfolio API","financial portfolio","x402 API","USDC micropayment API","lowpaymentfee","Base network API","pay-per-call API"],"warnings":["No documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no further content.","The /api/v1/portfolios/62 endpoint is not listed in the provider's own catalog of available APIs on the landing page.","No OpenAPI spec, request schema, or response schema found; the exact data returned is unknown.","Purpose of 'portfolios/62' is inferred from the URL path only — could be a demo or placeholder endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/portfolios/62","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/62","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 ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no example request/response, and the specific purpose of /api/v1/portfolios/62 is not described anywhere on the site. The docs and other pages rendered only wallet-connect prompts with no 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'0.02':77,140 '000':68 '20':67 '402':50 '6':73 'Base network API' 'USDC micropayment API' 'accept':197 'access':35 'addit':231 'address':91 'ai/ml':114 'amount':62 'analysi':116 'analyt':113 'api':34,110,145,220 'application/json':203 'avail':194 'base':7,20,58,69 'broader':103 'call':80 'catalog':104,170 'chain':86 'challeng':51 'classif':118 'commit':152 'connect':226 'content':232 'convers':135 'crawl':215 'data':112,185 'decim':74 'describ':165 'detail':207 'doc':208,217 'document':188 'embed':119 'endpoint':5,18,28,161,196 'equal':76 'estim':129 'exact':94,172 'exampl':191,210 'exchang':124 'feed':123 'financ':120 'financi':183 'financial portfolio' 'found':213 'gas':128 'gate':3,16 'generat':136 'geocod':133 'host':101 'howev':153 'http':198 'infrastructur':131 'json-api' 'key':146 'land':168 'limit':149 'list':156 'live':46 'lowpaymentfee' 'lowpaymentfee.com':30,100 'maximum':61 'name':180 'network':59 'on-chain':84 'openapi':205 'page':169,221 'pay':9,22,107 'pay-per-call API' 'pay-per-request':8,21,106 'payload':174,211 'payment':42,53,81,95 'per':10,23,64,79,108,141 'portfolio':4,17,181,184 'portfolio API' 'portfolio-data' 'post':199 'premium':33 'price':122,138,218 'prompt':228 'protocol':43 'provid':31,98 'purpos':176 'quot':127 'rate':125,148 'render':223 'request':11,24,65,109,142,200 'requir':52,63 'resourc':36 'respons':173,192 'return':48,202 'schema':189 'scheme':96 'sentiment':115 'settl':83 'site':99 'span':111 'spec':206 'specif':155 'specifi':89 'suggest':182 'summar':117 'token':126 'unclear':178 'unit':70 'usd':78 'usdc':13,26,55,72 'usdc-base' 'use':92 'util':132 'valid':134 'via':39 'wallet':90,227 'web3':121 'x402':2,15,41 'x402 API' 'x402-gated':1,14 'x402-payment'","prices":[{"id":"d42bde68-826d-4010-8a79-8574c8280f35","listingId":"ec4f7bd9-f19d-4e42-9a62-99913db440e8","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/62","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:05.576Z"}],"sources":[{"listingId":"ec4f7bd9-f19d-4e42-9a62-99913db440e8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/portfolios/62","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:05.576Z","lastSeenAt":"2026-04-27T21:34:10.221Z"}],"details":{"listingId":"ec4f7bd9-f19d-4e42-9a62-99913db440e8","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Without a payment library, you'll get a 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/portfolios/62\n# Returns 402 with x402 challenge. Use an x402-compatible client to attach payment.","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 of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/portfolios/62"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/portfolios/62"},{"claim":"The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The site catalogs APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving portfolio data (likely financial) on a per-request payment basis","Agent-driven data fetching with on-chain USDC micropayments on Base","Integrating pay-as-you-go API access without API keys or subscriptions"],"bestFor":["Agents or services that need keyless, pay-per-call API access","Users who prefer on-chain USDC micropayments over traditional billing","Developers exploring x402 protocol integrations on Base"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:59.331Z"},"updatedAt":"2026-04-27T21:34:10.221Z"}}