{"id":"8f1c2730-4f2c-4c03-950e-d565a71c8635","shortId":"apvnaa","kind":"x402","title":"x402-payable premium API endpoint on Base network, paid per-request in USDC.","tagline":"x402-payable premium API endpoint on Base network, paid per-request in USDC.","description":"This endpoint at lowpaymentfee.com provides a generic \"Premium API Access\" resource behind an x402 payment wall. The endpoint is live and returns a 402 challenge requiring payment in USDC on the Base network. The specific resource at `/api/resource/40` does not correspond to any of the named API categories listed on the provider's homepage (analytics, AI/ML, finance, infrastructure), and its actual functionality is unclear from available documentation.\n\nThe provider's landing page advertises a broad suite of APIs across data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request. However, this particular endpoint (`/api/resource/40`) has a `maxAmountRequired` of 20000 units of USDC (which, given USDC's 6 decimals, equals $0.02), consistent with the site-wide pricing. Payment is via the x402 protocol using the \"exact\" scheme on Base, paying to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`.\n\nDocumentation is essentially nonexistent — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what `/api/resource/40` actually returns. The endpoint accepts POST requests and promises `application/json` output, but beyond that, the actual behavior is unknown.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","json-response","http-post"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","The specific resource /api/resource/40 is not listed among the provider's advertised API categories; its actual functionality is unknown.","No OpenAPI schema, no input parameters, and no example responses are available.","Cannot verify what data or service this endpoint actually provides."],"endpointUrl":"https://lowpaymentfee.com/api/resource/40","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/resource/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid 402 challenge, but there is zero documentation on what /api/resource/40 actually does, no request/response schema, and the docs pages are empty. This is effectively a stub listing with only payment metadata 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'0.02':123,146 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':169 '20000':135 '402':54 '6':143 'Base network API' 'USDC API' 'accept':210 'access':40 'across':109 'actual':91,206,221 'address':168 'advertis':103 'ai':112 'ai/ml':86 'analyt':85,111 'api':5,20,39,77,108,176 'application/json':215 'avail':96 'base':8,23,62,165 'base-network' 'behavior':222 'behind':42 'beyond':218 'broad':105 'categori':78 'challeng':55 'connect':185 'consist':147 'content':191 'correspond':71 'data':110 'decim':144 'descript':202 'doc':175 'document':97,170 'endpoint':6,21,32,48,129,209 'equal':145 'essenti':172 'exact':162 'exampl':199 'financ':87,115 'function':92 'generic':37 'given':140 'homepag':84 'howev':126 'http-post' 'infrastructur':88,118 'json-response' 'land':101 'learn':114 'list':79 'live':50 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':113 'maxamountrequir':133 'micropayment API' 'name':76 'network':9,24,63 'nonexist':173 'openapi':195 'output':216 'page':102,180 'paid':10,25 'particular':128 'pay':166 'pay-per-call API' 'pay-per-request' 'payabl':3,18 'payment':45,57,154 'per':12,27,124 'per-request':11,26 'post':211 'premium':4,19,38 'price':121,153,177 'promis':214 'prompt':187 'protocol':159 'provid':35,82,99 'readm':179 'render':182 'request':13,28,125,212 'request/response':198 'requir':56 'resourc':41,66 'return':52,207 'schema':196 'scheme':163 'site':151 'site-wid':150 'specif':65 'substant':190 'suit':106 'unclear':94 'unit':136 'unknown':224 'usdc':15,30,59,138,141 'usdc-payment' 'use':160 'util':119 'via':156 'wall':46 'wallet':186 'web3':116 'wide':152 'x402':2,17,44,158 'x402 API' 'x402-payable':1,16 'x402-payment'","prices":[{"id":"c13366b3-dd4c-494b-bf14-f7567b91edcd","listingId":"8f1c2730-4f2c-4c03-950e-d565a71c8635","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/resource/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:52.435Z"}],"sources":[{"listingId":"8f1c2730-4f2c-4c03-950e-d565a71c8635","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/40","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:52.435Z","lastSeenAt":"2026-04-23T05:00:37.019Z"}],"details":{"listingId":"8f1c2730-4f2c-4c03-950e-d565a71c8635","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/40\n# Returns 402 with X-PAYMENT challenge; attach x402 payment header (USDC on Base, ~$0.02) to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring USDC payment on Base network with maxAmountRequired of 20000 (≈$0.02)","source_url":"https://lowpaymentfee.com/api/resource/40"},{"claim":"The provider advertises APIs across data & analytics, AI/ML, finance, and infrastructure categories at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The site claims no API keys, no rate limits, instant access, and Base network payments","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Testing x402 payment protocol integrations","Exploring pay-per-request API patterns on Base network","Agent-driven API consumption without API keys"],"bestFor":["Developers experimenting with x402 payment flows","Agents that need keyless, pay-per-request API access","Testing USDC micropayment integrations on Base"],"notFor":["Production workloads requiring documented, well-specified APIs","Users who need clear input/output schemas before integrating","Anyone needing free or traditional API-key-based access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:01.571Z"},"updatedAt":"2026-04-23T05:00:37.019Z"}}