{"id":"9e6359ba-d920-4401-a064-273c5497f881","shortId":"kPLRJJ","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":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 protocol on the Base network. Each call costs $0.02 in USDC (USD Coin) with no API keys, no rate limits, and no subscriptions required. The specific endpoint at `/api/v1/messages/93` is labeled \"Premium API Access\" and accepts HTTP POST requests, settling payment on-chain to a designated wallet address.\n\nThe broader platform advertises four endpoint 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 share the same $0.02 per-request pricing. However, the specific `/api/v1/messages/93` endpoint's exact functionality is not documented beyond its \"Premium API Access\" label, so its concrete behavior is unclear.\n\nPayment is handled via the x402 exact-payment scheme using USDC on Base (contract `0x8335…2913`). The x402 challenge confirms the endpoint is live, requesting a maximum of 20,000 base units (i.e., $0.02 given USDC's 6 decimals) with a 300-second payment timeout. No OpenAPI schema, detailed request/response documentation, or usage examples were found in the crawl.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","http-post","no-api-key","no-rate-limit"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API access","Base network API","lowpaymentfee","premium API"],"warnings":["No documentation found for the specific /api/v1/messages/93 endpoint — its actual functionality is unknown","No OpenAPI or request/response schema available","Crawled docs pages (/api, /pricing, /README) returned only a wallet-connect prompt with no content","The endpoint label 'Premium API Access' is generic and does not describe what data or service is provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/93","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/messages/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation for the /api/v1/messages/93 endpoint — no request schema, no response schema, no examples, and no explanation of what 'Premium API Access' actually returns. The crawl pages beyond the landing page were empty (wallet-connect gates). This is effectively a stub 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'/request':13,28 '0.02':12,27,54,140,202 '000':198 '0x8335':183 '20':197 '2913':184 '300':210 '6':206 'Base network API' 'USDC API access' 'accept':81 'access':7,22,79,160 'address':94 'advertis':98 'ai':109 'analysi':113 'analyt':103 'api':6,21,40,61,78,159 'base':9,24,49,181,199 'base-network' 'behavior':165 'beyond':156 'broader':96 'call':4,19,52 'categori':101 'chain':89 'challeng':187 'classif':116 'coin':58 'collect':34 'concret':164 'confirm':188 'contract':182 'convers':133 'cost':53 'crawl':227 'data':102,106 'decim':207 'design':92 'detail':217 'document':155,219 'embed':117 'endpoint':41,72,100,136,149,190 'estim':127 'exact':151,175 'exact-pay':174 'exampl':222 'exchang':122 'export':107 'feed':121 'financ':118 'found':224 'four':99 'function':152 'gas':126 'gate':42 'generat':134 'geocod':131 'given':203 'handl':170 'host':32 'howev':145 'http':82 'http-post' 'i.e':201 'infrastructur':129 'insight':108 'key':62 'label':76,161 'learn':111 'limit':65 'live':192 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':110 'maximum':195 'metric':104 'micropayment API' 'network':50 'no-api-key' 'no-rate-limit' 'on-chain':87 'openapi':215 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':86,168,176,212 'per':3,18,38,142 'per-request':141 'platform':97 'post':83 'premium':5,20,77,158 'premium API' 'price':120,144 'protocol':46 'quot':125 'rate':64,123 'report':105 'request':39,84,143,193 'request/response':218 'requir':69 'schema':216 'scheme':177 'second':211 'sentiment':112 'settl':85 'share':137 'specif':71,147 'subscript':68 'summar':115 'text':114 'timeout':213 'token':124 'unclear':167 'unit':200 'usag':221 'usd':57 'usdc':15,30,56,179,204 'usdc-settlement' 'use':178 'util':130 'valid':132 'via':10,25,171 'wallet':93 'web3':119 'x402':11,26,45,173,186 'x402 API' 'x402-payment'","prices":[{"id":"5076d5a3-36f7-4923-aab1-68a053c8add5","listingId":"9e6359ba-d920-4401-a064-273c5497f881","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/messages/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.506Z"}],"sources":[{"listingId":"9e6359ba-d920-4401-a064-273c5497f881","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/93","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.506Z","lastSeenAt":"2026-04-22T02:32:08.632Z"}],"details":{"listingId":"9e6359ba-d920-4401-a064-273c5497f881","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/93 \\\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 x402 challenge requesting 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/93"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/93"},{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API endpoints without needing API keys or subscriptions","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need frictionless per-request billing"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer on-chain USDC micropayments over traditional billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who want bulk/subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.437Z"},"updatedAt":"2026-04-22T02:32:08.632Z"}}