{"id":"8add26f7-db61-4889-8915-a3465d8da54f","shortId":"aJqfUt","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource `/api/v1/customers/49` appears to be one entry point in a broader platform that offers multiple API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints on the platform are priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests and settling payments in USDC (contract `0x8335...2913` on Base). The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per call. Payment is made via the `exact` scheme with a 300-second timeout. The response MIME type is `application/json`.\n\nWhile the platform advertises a wide range of endpoints (metrics, reports, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, etc.), this specific listing is for `/api/v1/customers/49`. The exact data returned by this particular endpoint is unclear — the description simply says \"Premium API Access\" without detailing the response schema. Documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response formats remain undocumented.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["data","infrastructure"],"synonyms":["low payment fee API","x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","customers endpoint"],"warnings":["No documentation available — all doc pages (/docs, /pricing, /api, /README) return only 'Connect wallet' with no content","The specific purpose and response format of /api/v1/customers/49 is undocumented","No OpenAPI spec or output schema beyond basic HTTP method info","The endpoint path suggests customer-specific data but no details on what fields are returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/49","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/customers/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation on what this specific endpoint returns, no request/response schema, and all doc pages are empty. The purpose of `/api/v1/customers/49` is 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'/api/v1/customers/49':47,186 '/docs':211 '/pricing':212 '/readme':214 '/request':13,28 '0.02':12,27,82,137 '000':128 '0x8335':118 '20':127 '2913':119 '300':149 '6':133 'Base network API' 'USDC API access' 'accept':109 'access':7,22,38,203 'actual':228 'advertis':161 'ai':66 'amount':124 'analysi':170 'analyt':65 'api':6,21,37,61,94,202 'appear':48 'application/json':157 'base':9,24,90,121,129 'broader':56 'call':4,19,139 'categori':62 'challeng':103 'classif':173 'commit':99 'confirm':104 'connect':219 'content':225 'contract':117 'customers endpoint' 'data':64,189 'decim':134 'descript':198 'detail':205 'document':209 'embed':174 'endpoint':32,75,106,166,194 'entri':52 'equal':136 'etc':180 'exact':145,188 'exchang':177 'feed':176 'financ':69 'format':230 'geocod':179 'includ':63 'infrastructur':72 'json-response' 'key':95 'learn':68 'limit':97 'list':183 'live':108 'low payment fee API' 'lowpaymentfee.com':34 'machin':67 'made':142 'max':123 'metric':167 'micropayment API' 'mime':154 'multipl':60 'network':91 'no-api-key' 'offer':59 'one':51 'page':210 'paid':85 'particular':193 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,114,140 'per':3,18,83,138 'platform':57,78,160 'point':53 'post':110 'post-method' 'premium':5,20,36,201 'price':80,175 'prompt':221 'protocol':43 'provid':35 'rang':164 'rate':96,178 'remain':231 'report':168 'request':84,111 'request/response':229 'requir':100,125 'resourc':46 'respons':153,207 'return':190,216 'say':200 'schema':208 'scheme':146 'second':150 'sentiment':169 'settl':113 'simpli':199 'specif':45,182 'substant':224 'summar':172 'text':171 'timeout':151 'type':155 'unclear':196 'undocu':232 'unit':130 'usdc':15,30,87,116,132 'usdc-base-network' 'util':73 'via':10,25,39,143 'wallet':220 'web3':70 'wide':163 'without':204 'x402':11,26,41,102 'x402 API' 'x402-payment'","prices":[{"id":"d0ca2586-b70c-4403-954b-c9a220b0ca0b","listingId":"8add26f7-db61-4889-8915-a3465d8da54f","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/customers/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:29.785Z"}],"sources":[{"listingId":"8add26f7-db61-4889-8915-a3465d8da54f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:29.785Z","lastSeenAt":"2026-04-28T12:33:33.793Z"}],"details":{"listingId":"8add26f7-db61-4889-8915-a3465d8da54f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/49 \\\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":"All endpoints priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/customers/49"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/49"}],"useCases":["Accessing premium data or customer records on a per-request payment basis","Integrating pay-as-you-go API calls into agent workflows without API key management","Demonstrating x402 payment protocol integration on Base network"],"bestFor":["Developers exploring x402 payment protocol integration","Agents needing keyless, pay-per-call API access","Low-volume consumers who want no subscription commitments"],"notFor":["Users needing detailed API documentation or response schema guarantees","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.722Z"},"updatedAt":"2026-04-28T12:33:33.793Z"}}