{"id":"c817b384-7c40-4ce7-a7be-10d4233096c3","shortId":"ej8nkc","kind":"x402","title":"Pay-per-call premium API endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call premium API endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com/api/endpoint-36 is an x402-gated API labeled \"Premium API Access.\" It accepts POST requests and charges per call using USDC on the Base network. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (which, at 6 decimals, equals $0.02 per request). Payment is made via the x402 exact scheme with no API keys or rate limits required — callers simply attach an X-PAYMENT header to each request.\n\nThe broader lowpaymentfee.com platform lists multiple API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities, all priced at $0.02 per request. However, this specific endpoint (/api/endpoint-36) is not explicitly listed among those named endpoints on the landing page, so its exact functionality is unclear. The description provided by the provider is simply \"Premium API Access\" with no further detail on what data or computation it returns. The output schema indicates it is a discoverable HTTP POST endpoint returning application/json.\n\nBecause the crawled documentation pages (docs, api, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content, there is very little information available about what this endpoint actually does, what request body it expects, or what response it produces. Prospective callers should be aware that the endpoint is live and accepting x402 payment challenges, but the lack of documentation makes it difficult to use without experimentation.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","json-response","http-post"],"categories":["api","crypto"],"synonyms":["x402 API","pay-per-request API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["Endpoint functionality is completely undocumented — 'Premium API Access' is the only description provided","All documentation pages (/docs, /api, /pricing, /README) returned no useful content","This specific endpoint path (/api/endpoint-36) does not appear in the provider's listed API catalog on the landing page","No request body schema or response schema is available; callers must experiment to discover usage"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-36","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-36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the endpoint's actual functionality is unknown. All doc pages returned only 'Connect wallet' with no content. This is effectively a stub 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'/request':17,34 '0.02':16,33,83,135 '000':73 '20':72 '6':80 'Base network API' 'USDC micropayment endpoint' 'accept':52,249 'access':50,171 'actual':226 'advertis':68 'ai':124 'among':147 'analyt':123 'api':6,23,46,49,96,119,170,202 'application/json':195 'attach':104 'avail':221 'awar':242 'base':9,26,63,74 'base-network' 'bodi':230 'broader':114 'call':4,21,58 'caller':102,239 'categori':120 'challeng':67,252 'charg':56 'comput':180 'connect':209 'content':215 'crawl':198 'crypto-paid API' 'data':122,178 'decim':81 'descript':162 'detail':175 'difficult':260 'discover':190 'doc':201 'document':199,257 'endpoint':7,24,36,141,150,193,225,245 'equal':82 'exact':92,157 'expect':232 'experiment':264 'explicit':145 'financ':127 'function':158 'gate':45 'header':109 'howev':138 'http':191 'http-post' 'includ':121 'indic':186 'inform':220 'infrastructur':130 'json-response' 'key':97 'label':47 'lack':255 'land':153 'learn':126 'limit':100 'list':117,146 'littl':219 'live':247 'lowpaymentfee' 'lowpaymentfee.com':39,115 'lowpaymentfee.com/api/endpoint-36':38 'machin':125 'made':88 'make':258 'maxamountrequir':70 'multipl':118 'name':149 'network':64 'no-api-key' 'output':184 'page':154,200 'pay':2,19 'pay-per-cal':1,18 'pay-per-call' 'pay-per-request API' 'payment':86,108,251 'per':3,20,57,84,136 'platform':116 'post':53,192 'premium':5,22,48,169 'premium API access' 'price':133,203 'produc':237 'prompt':211 'prospect':238 'provid':163,166 'rate':99 'readm':204 'request':54,85,112,137,229 'requir':101 'respons':235 'return':182,194,206 'schema':185 'scheme':93 'settl':12,29 'simpli':103,168 'specif':140 'substant':214 'unclear':160 'unit':75 'usdc':14,31,60,77 'usdc-settlement' 'use':59,262 'util':131 'via':10,27,89 'wallet':210 'web3':128 'without':263 'x':107 'x-payment':106 'x402':11,28,44,66,91,250 'x402 API' 'x402-gated':43 'x402-payment'","prices":[{"id":"40564e7f-8953-459b-9edd-4fdd37e95cc4","listingId":"c817b384-7c40-4ce7-a7be-10d4233096c3","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-36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:13.880Z"}],"sources":[{"listingId":"c817b384-7c40-4ce7-a7be-10d4233096c3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-36","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:13.880Z","lastSeenAt":"2026-04-23T02:00:22.669Z"}],"details":{"listingId":"c817b384-7c40-4ce7-a7be-10d4233096c3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-36 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/endpoint-36"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/endpoint-36"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API without traditional API key registration","Agent-driven workflows that need to pay per call using USDC on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents with Base USDC wallets needing on-demand API access","Low-commitment, no-signup API consumption"],"notFor":["Users who need detailed documentation before calling an endpoint","High-volume use cases where $0.02/request adds up without volume discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T19:17:43.937Z"},"updatedAt":"2026-04-23T02:00:22.669Z"}}