{"id":"f838bb64-46d2-4e1e-91bf-a8d1dda337f9","shortId":"zcekgb","kind":"x402","title":"Pay-per-request premium API access via x402 on Base network using USDC.","tagline":"Pay-per-request premium API access via x402 on Base network using USDC.","description":"This endpoint at lowpaymentfee.com provides a generic \"Premium API Access\" resource at /api/resource/43, payable via the x402 protocol on the Base network using USDC. The provider's site advertises a broad catalog of API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities, all priced at $0.02 per request with no API keys, no rate limits, and instant access.\n\nThe specific endpoint /api/resource/43 does not correspond to any of the named endpoints listed on the provider's homepage (which use paths like /api/v1/ and /api/v2/). The x402 challenge is live and returns a 402 Payment Required response on POST, requesting payment of up to 20,000 units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base) to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. The response MIME type is application/json. However, there is no documentation, OpenAPI schema, or description of what this particular resource returns or what input it expects beyond a POST request.\n\nThe provider's documentation pages (/docs, /api, /pricing, /README) all returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what /api/resource/43 actually does, callers should treat this as an opaque premium endpoint with unknown functionality.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","json-response","post-method"],"categories":["api","payment"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["No documentation available — /docs, /pricing, /README all return only 'Connect wallet' with no content","The endpoint /api/resource/43 does not match any named API listed on the provider's homepage","No OpenAPI schema, input schema, or output schema provided","Unknown what data or service this endpoint actually provides","maxAmountRequired is 20000 units of USDC — verify decimal precision before paying (USDC has 6 decimals, so this could be $0.02 or $20,000 depending on interpretation)"],"endpointUrl":"https://lowpaymentfee.com/api/resource/43","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/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge is live and well-formed, but there is zero documentation about what /api/resource/43 actually does. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt. The endpoint path doesn't match any of the named APIs on the homepage. This is effectively a stub listing with no usable schema or description of 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'/api/resource/43':41,94,201 '/api/v1':114 '/api/v2':116 '/docs':183 '/pricing':185 '/readme':186 '0.02':78 '000':137 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':142 '20':136 '402':125 'Base network API' 'USDC API' 'access':7,21,38,90 'actual':202 'address':146 'advertis':57 'ai':67 'analyt':66 'api':6,20,37,62,83 'application/json':153 'asset':141 'base':11,25,49,144 'base-network' 'beyond':174 'broad':59 'caller':204 'catalog':60 'categori':63 'challeng':119 'connect':191 'content':197 'correspond':97 'data':65 'descript':162 'document':158,181 'endpoint':30,93,103,212 'expect':173 'financ':70 'function':215 'generic':35 'homepag':109 'howev':154 'includ':64 'infrastructur':73 'input':171 'instant':89 'json-response' 'key':84 'know':199 'learn':69 'like':113 'limit':87 'list':104 'live':121 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':68 'micropayment API' 'mime':150 'name':102 'network':12,26,50 'opaqu':210 'openapi':159 'page':182 'particular':166 'path':112 'pay':2,16 'pay-per-call API' 'pay-per-request':1,15 'payabl':42 'payment':126,132 'per':3,17,79 'post':130,176 'post-method' 'premium':5,19,36,211 'price':76 'prompt':193 'protocol':46 'provid':33,54,107,179 'rate':86 'request':4,18,80,131,177 'requir':127 'resourc':39,167 'respons':128,149 'return':123,168,188 'schema':160 'site':56 'specif':92 'substant':196 'treat':206 'type':151 'unit':138 'unknown':214 'usdc':14,28,52,140 'usdc-payment' 'use':13,27,51,111 'util':74 'via':8,22,43 'wallet':192 'web3':71 'without':198 'x402':9,23,45,118 'x402 API' 'x402-payment'","prices":[{"id":"9e40c9b6-eb16-4cbc-9e72-091a318cabf8","listingId":"f838bb64-46d2-4e1e-91bf-a8d1dda337f9","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/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:57.899Z"}],"sources":[{"listingId":"f838bb64-46d2-4e1e-91bf-a8d1dda337f9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/43","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:57.899Z","lastSeenAt":"2026-04-23T05:00:37.365Z"}],"details":{"listingId":"f838bb64-46d2-4e1e-91bf-a8d1dda337f9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/43\n# Returns 402 with X-PAYMENT challenge; attach x402 payment header to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The provider homepage lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02/request with no API keys, no rate limits, instant access, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns 402 with USDC payment on Base to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/resource/43"}],"useCases":["Programmatic access to a premium resource via x402 micropayment","Agent-driven pay-per-request API consumption on Base network","Testing x402 payment flows with a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need pay-per-request API access without API keys","Users who want to pay with USDC on Base"],"notFor":["Users who need documented, well-specified API contracts","Production workloads requiring known SLAs or rate limit guarantees","Anyone needing to understand exactly what the endpoint returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:01.006Z"},"updatedAt":"2026-04-23T05:00:37.365Z"}}