{"id":"4ce850b3-1641-4fff-91ad-5e98196a4767","shortId":"q756GS","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":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints settled via the x402 protocol on the Base network using USDC. The specific endpoint `/api/endpoint-98` is listed as \"Premium API Access\" and accepts POST requests. Payment is made per-call with no API keys, no rate limits, and no upfront commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises endpoints across four categories: 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 are priced at $0.02 per request. The x402 challenge for this endpoint specifies a maxAmountRequired of 20000 base units of USDC (6 decimals), which equals $0.02.\n\nNote that while the site lists many endpoints, the specific functionality behind `/api/endpoint-98` is not documented beyond the generic label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content. Prospective callers should be aware that the actual behavior of this endpoint is unclear from available documentation.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","The specific functionality of /api/endpoint-98 ('Premium API Access') is completely undocumented","No OpenAPI or output schema provided beyond basic HTTP method info","No request or response examples available to verify endpoint behavior"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-98","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-98","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, no documentation of what the endpoint actually does, and all doc pages render only 'Connect wallet'. The listing is effectively a stub with confirmed 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'/request':12,30 '0.02':11,29,150,172 '20000':163 '6':168 'Base network API' 'USDC micropayment API' 'accept':70 'access':68,195 'across':109 'actual':229 'addit':220 'advertis':107 'ai':119 'analysi':123 'analyt':113 'api':6,16,24,34,46,67,81,194,209 'attach':92 'avail':237 'awar':226 'base':8,26,55,164 'base-network' 'behavior':230 'behind':184 'beyond':189 'broader':105 'call':4,22,78 'caller':90,223 'categori':111 'challeng':155 'classif':126 'collect':40 'commit':89 'connect':215 'content':221 'convers':143 'crypto-paid endpoint' 'data':112,116 'decim':169 'doc':206 'document':188,238 'embed':127 'endpoint':47,61,108,146,158,180,233 'equal':171 'estim':137 'exampl':203 'exchang':132 'export':117 'feed':131 'financ':128 'four':110 'function':183 'gas':136 'generat':144 'generic':191 'geocod':141 'header':97 'host':38 'http-post' 'infrastructur':139 'insight':118 'key':17,35,82 'label':192 'learn':121 'limit':85 'list':64,178 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':120 'made':75 'mani':179 'maxamountrequir':161 'metric':114 'network':56 'no-api-key' 'note':173 'openapi':199 'page':210 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':73,96,102 'per':3,21,44,77,151 'per-cal':76 'platform':106 'post':71 'premium':5,23,66,193 'premium API access' 'price':130,148,207 'prompt':217 'proof':103 'prospect':222 'protocol':52 'quot':135 'rate':84,133 'render':212 'report':115 'request':45,72,152 'request/response':202 'requir':18,36 'schema':200 'sentiment':122 'settl':48 'simpli':91 'site':177 'specif':60,182 'specifi':159 'summar':125 'text':124 'token':134 'unclear':235 'unit':165 'upfront':88 'usdc':14,32,58,167 'usdc-settlement' 'use':57 'util':140 'valid':100,142 'via':9,27,49 'wallet':216 'web3':129 'x':95 'x-payment':94 'x402':10,28,51,101,154 'x402 API' 'x402-payment'","prices":[{"id":"5cd67df4-2964-4e05-a547-902503cc0679","listingId":"4ce850b3-1641-4fff-91ad-5e98196a4767","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-98","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:00.413Z"}],"sources":[{"listingId":"4ce850b3-1641-4fff-91ad-5e98196a4767","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-98","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:00.413Z","lastSeenAt":"2026-04-23T00:31:11.734Z"}],"details":{"listingId":"4ce850b3-1641-4fff-91ad-5e98196a4767","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-98 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/endpoint-98"},{"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":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API endpoint without needing API key registration","Agent-driven workflows that settle per-call costs in USDC on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment flows","AI agents that need keyless, pay-as-you-go API access","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone requiring non-crypto (fiat) payment methods","High-volume use cases where $0.02/request adds up without volume discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.11Z"},"updatedAt":"2026-04-23T00:31:11.734Z"}}