{"id":"5dd73331-efad-4df5-9ed3-83fd54d31963","shortId":"kL94ad","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. It is one of many endpoints offered by the platform, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, no rate limits, and no commitments required.\n\nThe specific resource `/api/v1/generate/resource/6` is labeled \"Premium API Access\" in the x402 challenge but does not appear in the site's publicly listed endpoint catalog. The catalog lists endpoints like `/api/v1/utils/generate` (Generation), `/api/v2/ai/summarize` (Text Summarization), `/api/v1/finance/prices` (Price Feeds), and others — but `resource/6` is not among them. This makes it unclear exactly what this particular endpoint returns. The x402 challenge confirms it accepts POST requests, returns `application/json`, and costs up to 20,000 base units of USDC (6 decimals), which equals $0.02.\n\nThe platform requires no authentication beyond the x402 payment header. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The endpoint is live and returns a proper 402 challenge. However, documentation is essentially absent — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["general","infrastructure"],"synonyms":["premium API","x402 API","pay-per-call API","lowpaymentfee","USDC API access","Base network API","micropayment API"],"warnings":["The endpoint /api/v1/generate/resource/6 is not listed in the site's public API catalog — its actual functionality is unclear.","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no substantive content.","No OpenAPI spec, no request/response examples, and no schema beyond the x402 outputSchema stub.","The description 'Premium API Access' is generic and does not explain what the endpoint does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/6","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/generate/resource/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, the specific resource/6 endpoint is not listed in the site catalog, documentation pages are empty (only 'Connect wallet'), there is no OpenAPI schema, no example requests or responses, and the actual functionality of this endpoint is 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'/api/v1/generate/resource/6':97 '/api/v1/utils/generate':124 '/api/v2/ai/summarize':126 '/request':13,28 '0.02':12,27,73,174 '000':165 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':190 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':193 '20':164 '402':204 '6':170 'Base network API' 'USDC API access' 'absent':210 'accept':155 'access':7,22,38,102 'address':189 'ai':60 'among':138 'analyt':59 'api':6,21,37,85,101,213 'appear':110 'application/json':159 'authent':179 'base':9,24,81,166,195 'beyond':180 'call':4,19 'catalog':118,120 'categori':56 'challeng':106,152,205 'commit':92 'confirm':153 'connect':222 'content':228 'cost':161 'data':58 'decim':171 'doc':212 'document':207 'endpoint':32,49,69,117,122,148,197 'equal':173 'essenti':209 'exact':144 'feed':131 'financ':63 'generat':125 'header':184 'howev':206 'includ':57 'infrastructur':66 'json-response' 'key':86 'label':99 'learn':62 'like':123 'limit':89 'list':116,121 'live':199 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':61 'made':187 'make':141 'mani':48 'micropayment API' 'network':82 'no-api-key' 'offer':50 'one':46 'other':133 'page':217 'particular':147 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,183,185 'per':3,18,74 'platform':53,176 'post':156 'post-method' 'premium':5,20,36,100 'premium API' 'price':71,130,214 'prompt':224 'proper':203 'protocol':43 'provid':35 'public':115 'rate':88 'readm':216 'render':219 'request':75,157 'requir':93,177 'resourc':96 'resource/6':135 'return':149,158,201 'settl':76 'site':113 'span':55 'specif':95 'substant':227 'summar':128 'text':127 'unclear':143 'unit':167 'usdc':15,30,78,169,192 'usdc-base' 'use':191 'util':67 'via':10,25,39 'wallet':223 'web3':64 'x402':11,26,41,105,151,182 'x402 API' 'x402-payment'","prices":[{"id":"06473adc-575e-4587-a150-372ffa82050f","listingId":"5dd73331-efad-4df5-9ed3-83fd54d31963","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/generate/resource/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:35.738Z"}],"sources":[{"listingId":"5dd73331-efad-4df5-9ed3-83fd54d31963","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/6","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:35.738Z","lastSeenAt":"2026-04-22T10:01:26.353Z"}],"details":{"listingId":"5dd73331-efad-4df5-9ed3-83fd54d31963","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/6 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/6"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 and payTo is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/6"},{"claim":"The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a generic premium API endpoint with per-call USDC micropayments on Base","Testing x402 payment protocol integrations against a live endpoint","Agent-driven API consumption without pre-registration or API keys"],"bestFor":["Developers experimenting with x402 payment flows","Agents that need keyless, pay-per-call API access on Base","Low-friction API consumption without subscriptions"],"notFor":["Users who need detailed documentation or guaranteed SLAs","Production workloads requiring well-documented, specific endpoint behavior","Anyone needing non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.365Z"},"updatedAt":"2026-04-22T10:01:26.353Z"}}