{"id":"d41093c7-9cb8-45ad-9e88-9590e08739ac","shortId":"GR3UFG","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 accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/endpoint-92`) is listed as \"Premium API Access\" and accepts USDC payments on Base. The x402 challenge confirms the endpoint is live and charges up to 20,000 base units of USDC (i.e., $0.02 per request, since USDC uses 6 decimals). Payment is made inline via the X-PAYMENT header — no API keys, subscriptions, or rate limits are advertised.\n\nThe broader lowpaymentfee.com 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 listed endpoints share the same $0.02/request pricing. However, the specific endpoint `/api/endpoint-92` does not map to any of the named endpoints on the site's landing page, so its exact functionality is unclear.\n\nThe endpoint settles payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The x402 challenge specifies a 300-second payment timeout and returns `application/json`. No OpenAPI schema, detailed documentation, or example responses were found — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","http-post"],"categories":["api","misc"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["The endpoint path /api/endpoint-92 does not correspond to any named API on the provider's landing page; its actual functionality is unknown.","No OpenAPI schema or documentation is available — docs, pricing, and API pages all show only 'Connect wallet'.","No example response is available; the output format and fields are entirely unknown.","The provider site appears to be a generic x402 demo or template; endpoint reliability and data quality are unverified."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-92","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-92","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but the specific functionality of /api/endpoint-92 is unknown — it doesn't match any named endpoint on the site. No OpenAPI schema, no documentation, no example responses, and all doc pages render only 'Connect wallet'. This is effectively a stub 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'/request':12,30,169 '0.02':11,29,93,168 '000':87 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':203 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':206 '20':86 '300':214 '6':99 'Base network API' 'USDC micropayment API' 'accept':69 'access':48,67 'across':126 'addit':246 'address':202 'advertis':119,124 'ai':136 'analysi':140 'analyt':130 'api':6,16,24,34,46,66,112,235 'application/json':220 'base':8,26,56,73,88,208 'broader':121 'call':4,22 'categori':128 'challeng':76,211 'charg':83 'classif':143 'collect':40 'confirm':77 'connect':241 'content':247 'convers':160 'crypto-paid endpoint' 'data':129,133 'decim':100 'detail':224 'doc':232 'document':225 'embed':144 'endpoint':47,60,79,125,164,174,184,198 'estim':154 'exact':193 'exampl':227 'exchang':149 'export':134 'feed':148 'financ':145 'found':230 'four':127 'function':194 'gas':153 'generat':161 'geocod':158 'header':110 'host':38 'howev':171 'http-post' 'i.e':92 'infrastructur':156 'inlin':104 'insight':135 'json-response' 'key':17,35,113 'land':189 'learn':138 'limit':117 'list':63,163 'live':81 'lowpaymentfee' 'lowpaymentfee.com':37,122 'machin':137 'made':103 'map':178 'metric':131 'name':183 'network':57 'no-api-key' 'openapi':222 'page':190,236 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':52,71,101,109,200,216 'per':3,21,44,94 'platform':123 'premium':5,23,65 'premium API access' 'price':147,170,233 'prompt':243 'protocol':53 'quot':152 'rate':116,150 'render':238 'report':132 'request':45,95 'requir':18,36 'respons':228 'return':219 'schema':223 'second':215 'sentiment':139 'settl':199 'share':165 'sinc':96 'site':187 'specif':59,173 'specifi':212 'subscript':114 'summar':142 'text':141 'timeout':217 'token':151 'unclear':196 'unit':89 'usdc':14,32,70,91,97,205 'usdc-base' 'use':98,204 'util':157 'valid':159 'via':9,27,49,105 'wallet':242 'web3':146 'x':108 'x-payment':107 'x402':10,28,51,75,210 'x402 API' 'x402-payment'","prices":[{"id":"232d8e6e-b282-4afe-9493-320890bb9e07","listingId":"d41093c7-9cb8-45ad-9e88-9590e08739ac","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-92","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:40.894Z"}],"sources":[{"listingId":"d41093c7-9cb8-45ad-9e88-9590e08739ac","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-92","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:40.894Z","lastSeenAt":"2026-04-22T13:30:31.724Z"}],"details":{"listingId":"d41093c7-9cb8-45ad-9e88-9590e08739ac","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-92 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/endpoint-92","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (=$0.02)","source_url":"https://lowpaymentfee.com/api/endpoint-92"},{"claim":"All listed endpoints on the site are priced at $0.02/request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/endpoint-92"},{"claim":"The site 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 managing API keys or subscriptions","Agent-driven workflows that need to pay per call using USDC on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents with Base USDC wallets needing on-demand API access","Low-volume, pay-as-you-go API consumption without signup"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume use cases where $0.02/request adds up without bulk discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.099Z"},"updatedAt":"2026-04-22T13:30:31.724Z"}}