{"id":"172317d8-061e-4811-b712-c52028b33d72","shortId":"xYJdhy","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated premium API endpoint on Base, pay-per-request with USDC.","description":"This endpoint at lowpaymentfee.com is an x402-protocol gated API resource. The specific path `/api/v1/orders/48` is described as \"Premium API Access\" and returns JSON upon successful payment. It settles on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with an exact payment scheme.\n\nThe x402 challenge indicates a maximum amount of 20,000 base units of USDC. Since USDC uses 6 decimals, this translates to $0.02 per request — consistent with the provider's advertised flat pricing of $0.02/request across all their endpoints. The provider offers a broader suite of 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 at the same $0.02 price point.\n\nHowever, the specific endpoint `/api/v1/orders/48` does not appear in the provider's publicly listed API catalog, and its actual functionality is unclear. The description \"Premium API Access\" is generic and no documentation, request schema, or response schema is available for this particular path. The docs, pricing, and README pages on the site returned only a \"Connect wallet\" prompt with no substantive content. Without further documentation, the exact purpose and output of this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","post-method"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The endpoint /api/v1/orders/48 is not listed among the provider's publicly documented APIs — its purpose is unknown.","No request or response schema is available; the output of this endpoint cannot be verified.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no substantive content.","The generic description 'Premium API Access' provides no insight into what data or service is actually delivered."],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/48","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/orders/48","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 captured) and pricing is clear ($0.02/request in USDC on Base). However, the specific endpoint /api/v1/orders/48 is not listed in the provider's public catalog, no documentation or schema exists, and the actual functionality is entirely unknown. Docs pages returned only wallet-connect prompts with no 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'/request':107 '0.02':94,106,150 '000':81 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':66 '20':80 '6':89 'Base network API' 'USDC micropayment endpoint' 'access':50,179 'across':108 'actual':171 'advertis':102 'ai/ml':123 'amount':78 'analysi':125 'analyt':122 'api':5,19,39,49,119,167,178 'appear':160 'avail':191 'base':8,22,61,82 'base-network' 'broader':116 'catalog':168 'challeng':74 'classif':127 'connect':208 'consist':97 'content':214 'contract':65 'convers':144 'crypto-paid API' 'data':121 'decim':90 'describ':46 'descript':176 'doc':197 'document':184,217 'embed':128 'endpoint':6,20,30,111,156,225 'estim':138 'exact':69,219 'exchang':133 'feed':132 'financ':129 'flat':103 'function':172 'gas':137 'gate':3,17,38 'generat':145 'generic':181 'geocod':142 'howev':153 'indic':75 'infrastructur':140 'json':53 'json-response' 'list':166 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':77 'network':62 'offer':114 'output':222 'page':201 'particular':194 'path':43,195 'pay':10,24 'pay-per-call API' 'pay-per-request':9,23 'payment':56,70 'per':11,25,95 'point':152 'post-method' 'premium':4,18,48,177 'premium API access' 'price':104,131,151,198 'prompt':210 'protocol':37 'provid':100,113,163 'public':165 'purpos':220 'quot':136 'rate':134 'readm':200 'remain':226 'request':12,26,96,185 'resourc':40 'respons':188 'return':52,205 'schema':186,189 'scheme':71 'sentiment':124 'settl':58 'sinc':86 'site':204 'span':120 'specif':42,155 'substant':213 'success':55 'suit':117 'summar':126 'token':135 'translat':92 'unclear':174 'unit':83 'unknown':227 'upon':54 'usdc':14,28,64,85,87 'usdc-settlement' 'use':63,88 'util':141 'valid':143 'wallet':209 'web3':130 'without':215 'x402':2,16,36,73 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':35","prices":[{"id":"2a53a73e-e898-4b9e-a0b7-f934a16a6228","listingId":"172317d8-061e-4811-b712-c52028b33d72","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/orders/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:50.466Z"}],"sources":[{"listingId":"172317d8-061e-4811-b712-c52028b33d72","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/48","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:50.466Z","lastSeenAt":"2026-04-22T23:00:59.414Z"}],"details":{"listingId":"172317d8-061e-4811-b712-c52028b33d72","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/48 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/orders/48"},{"claim":"USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/orders/48"},{"claim":"Provider advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Provider lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API resource with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Demonstrating x402 protocol integration for pay-per-request services"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base L2","Use cases requiring no API keys or rate limits"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Applications requiring free or subscription-based API access","Anyone needing clarity on what data this specific endpoint returns"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.642Z"},"updatedAt":"2026-04-22T23:00:59.414Z"}}