{"id":"f2c0cf0a-737a-41d0-824b-32c987aa22f4","shortId":"YTPycn","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 is one of many x402-enabled API resources offered by the platform. The specific resource `/api/v1/generate/resource/16` is labeled \"Premium API Access\" and accepts POST requests, settling payments in USDC on the Base network. The x402 challenge confirms a max cost of 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the site's uniform $0.02/request pricing across all endpoints.\n\nThe broader lowpaymentfee.com platform advertises four categories of APIs: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02 per-request pricing with no API keys, no rate limits, and no minimum commitments required.\n\nHowever, documentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what this specific resource/16 endpoint actually returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality it provides beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["infrastructure","api"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","crypto-paid API","402 payment endpoint"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or output schema provided; request and response formats are completely unknown.","The specific functionality of /api/v1/generate/resource/16 ('Premium API Access') is not described anywhere.","Cannot verify what data or service this endpoint actually provides."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/16","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/16","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 with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and no meaningful documentation — the docs/pricing/README pages are all blank beyond a wallet connect prompt. The purpose of this specific resource/16 endpoint is 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'/request':13,28,97 '0.02':12,27,87,96,149 '000':78 '20':77 '402':216 '402 payment endpoint' '6':83 'Base network API' 'USDC micropayment API' 'accept':58 'access':7,22,56,235 'across':99 'actual':207 'advertis':106 'ai':118 'analysi':122 'analyt':112 'api':6,21,42,55,110,156,173,234 'base':9,24,67,79 'base-network' 'beyond':230 'broader':103 'call':4,19 'categori':108 'challeng':71,217 'classif':125 'commit':164 'confirm':72 'connect':182 'consist':90 'convers':142 'cost':75 'crypto-paid API' 'data':111,115,225 'decim':84 'descript':200 'detail':189 'doc':172 'document':167,220 'embed':126 'enabl':41 'endpoint':32,101,145,206,210 'equal':86 'estim':136 'exampl':197 'exchang':131 'export':116 'extrem':169 'feed':130 'financ':127 'four':107 'function':227 'gas':135 'generat':143 'generic':232 'geocod':140 'howev':166 'infrastructur':138 'insight':117 'key':157 'label':53,236 'learn':120 'limit':160 'live':212 'lowpaymentfee' 'lowpaymentfee.com':34,104 'machin':119 'mani':38 'max':74 'metric':113 'minimum':163 'network':68 'no-api-key' 'offer':44 'one':36 'openapi':193 'page':177 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':62 'per':3,18,88,151 'per-request':150 'platform':47,105 'post':59 'post-method' 'premium':5,20,54,233 'price':98,129,153,174 'prompt':184 'provid':229 'quot':134 'rate':132,159 'readm':176 'render':179 'report':114 'request':60,89,152 'request/response':196 'requir':165 'resourc':43,50 'resource/16':205 'return':208,213 'schema':194 'sentiment':121 'settl':61 'share':146 'site':93 'spars':170 'specif':49,204 'summar':124 'technic':188 'text':123 'token':133 'unclear':223 'uniform':95 'unit':80 'usdc':15,30,64,82 'usdc-settlement' 'util':139 'valid':141,215 'via':10,25 'wallet':183 'web3':128 'without':219 'x402':11,26,40,70 'x402 API' 'x402-enabled':39 'x402-payment'","prices":[{"id":"81f02c22-5c48-45d0-abe1-b7134c9e7c0d","listingId":"f2c0cf0a-737a-41d0-824b-32c987aa22f4","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/16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:49.399Z"}],"sources":[{"listingId":"f2c0cf0a-737a-41d0-824b-32c987aa22f4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/16","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:49.399Z","lastSeenAt":"2026-04-22T21:30:33.421Z"}],"details":{"listingId":"f2c0cf0a-737a-41d0-824b-32c987aa22f4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/16 \\\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 endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/16"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/16"}],"useCases":["Accessing premium API resources with per-call USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to utility/generation endpoints"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or response schemas before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Developers who require fiat-only payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.833Z"},"updatedAt":"2026-04-22T21:30:33.421Z"}}