{"id":"1c5812a2-97bc-44fe-8a69-faeb07223224","shortId":"qEgbp9","kind":"x402","title":"Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.","description":"This endpoint at lowpaymentfee.com/api/endpoint-56 is one of many pay-per-call APIs offered by the lowpaymentfee.com platform. It is labeled \"Premium API Access\" but the specific functionality behind this particular path (/api/endpoint-56) is not documented — the site lists named endpoints under categories like Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure, but endpoint-56 does not map to any of those named routes.\n\nThe endpoint is live and returns a valid x402 payment challenge on POST. It accepts payment in USDC (contract 0x8335…2913) on the Base network using the \"exact\" scheme. The maxAmountRequired is 20,000 base units, which at 6 decimals for USDC equals $0.02 per request. Payment is made via the X-PAYMENT header with a 300-second timeout. No API key or account registration is needed — access is granted purely through per-request micropayment.\n\nThe broader platform advertises a uniform $0.02/request pricing across all endpoints, with no rate limits and no minimum commitments. However, documentation beyond the landing page is essentially empty (all subpages just show \"Connect wallet\"), so there is no schema documentation, example requests, or response format details available for this or any other endpoint on the site.","tags":[],"capabilities":["x402-payment","per-request-micropayment","usdc-base-network","no-api-key","pay-per-use"],"categories":["general","infrastructure"],"synonyms":["premium API","pay-per-call API","x402 endpoint","micropayment API","USDC API access","lowpaymentfee","Base network API"],"warnings":["The specific functionality of /api/endpoint-56 is unknown — it does not correspond to any named endpoint on the site's landing page.","All documentation pages (/docs, /api, /pricing, /README) are empty, showing only 'Connect wallet'.","No request or response schema is available for this or any endpoint on the platform.","The platform lists many endpoint categories (AI, finance, analytics, etc.) but provides no technical documentation for any of them."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-56","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/endpoint-56","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 x402 challenge, but the specific functionality of /api/endpoint-56 is undocumented. All documentation pages beyond the landing page are empty ('Connect wallet'). No request/response schema, no examples, and no description of what this endpoint actually does. This is effectively a stub 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'/api/endpoint-56':42,71 '/request':12,30,188 '0.02':11,29,147,187 '000':137 '0x8335':123 '20':136 '2913':124 '300':161 '6':142 'Base network API' 'USDC API access' 'accept':118 'access':62,172 'account':168 'across':190 'advertis':184 'ai':85 'analyt':84 'api':6,16,24,34,51,61,165 'avail':228 'base':8,26,127,138 'behind':67 'beyond':203 'broader':182 'call':4,22,50 'categori':81 'challeng':114 'commit':200 'connect':214 'contract':122 'data':83 'decim':143 'detail':227 'document':74,202,221 'empti':209 'endpoint':38,79,93,105,192,234 'equal':146 'essenti':208 'exact':131 'exampl':222 'financ':88 'format':226 'function':66 'grant':174 'header':158 'howev':201 'infrastructur':91 'key':17,35,166 'label':59 'land':205 'learn':87 'like':82 'limit':196 'list':77 'live':107 'lowpaymentfee' 'lowpaymentfee.com':41,55 'lowpaymentfee.com/api/endpoint-56':40 'machin':86 'made':152 'mani':46 'map':97 'maxamountrequir':134 'micropay':180 'micropayment API' 'minimum':199 'name':78,102 'need':171 'network':128 'no-api-key' 'offer':52 'one':44 'page':206 'particular':69 'path':70 'pay':2,20,48 'pay-per-cal':1,19,47 'pay-per-call API' 'pay-per-use' 'payment':113,119,150,157 'per':3,21,49,148,178 'per-request':177 'per-request-micropayment' 'platform':56,183 'post':116 'premium':5,23,60 'premium API' 'price':189 'pure':175 'rate':195 'registr':169 'request':149,179,223 'requir':18,36 'respons':225 'return':109 'rout':103 'schema':220 'scheme':132 'second':162 'show':213 'site':76,237 'specif':65 'subpag':211 'timeout':163 'uniform':186 'unit':139 'usdc':14,32,121,145 'usdc-base-network' 'use':129 'valid':111 'via':9,27,153 'wallet':215 'web3':89 'x':156 'x-payment':155 'x402':10,28,112 'x402 endpoint' 'x402-payment'","prices":[{"id":"1c0d2e95-c532-42fd-b55a-0f69716b3dd1","listingId":"1c5812a2-97bc-44fe-8a69-faeb07223224","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/endpoint-56","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:29.538Z"}],"sources":[{"listingId":"1c5812a2-97bc-44fe-8a69-faeb07223224","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-56","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:29.538Z","lastSeenAt":"2026-04-22T15:00:28.390Z"}],"details":{"listingId":"1c5812a2-97bc-44fe-8a69-faeb07223224","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-56 \\\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":"Uniform pricing of $0.02 per request across all endpoints, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network with 300-second timeout","source_url":"https://lowpaymentfee.com/api/endpoint-56"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/endpoint-56"},{"claim":"Documentation pages (/docs, /pricing, /README) contain no useful content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a generic pay-per-call API endpoint without needing API keys or account setup","Integrating micropayment-gated services into agent workflows on the Base network","Testing x402 protocol payment flows with a low-cost endpoint"],"bestFor":["Developers exploring x402 micropayment protocol integration","Agents needing keyless, pay-as-you-go API access on Base","Low-cost experimentation with crypto-settled API calls"],"notFor":["Users who need documented request/response schemas before integrating","Production workloads requiring SLA guarantees or detailed documentation","Anyone needing non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:56.434Z"},"updatedAt":"2026-04-22T15:00:28.390Z"}}