{"id":"10a0a216-77c5-42cf-8da4-2556fc2b6b7e","shortId":"U9d443","kind":"x402","title":"Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.","tagline":"Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/messages/176` is listed as \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). No API keys, rate limits, or subscriptions are required — each request is paid individually via an X-PAYMENT header.\n\nThe broader platform advertises multiple API categories including 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 listed at the same $0.02/request price point and settle in USDC on the Base L2 network.\n\nThe specific functionality behind `/api/v1/messages/176` is unclear — the endpoint name suggests a messaging or content resource, but no documentation, request schema, or response schema is available beyond the generic \"Premium API Access\" label. The endpoint accepts POST requests and returns application/json. The x402 challenge is live and well-formed, confirming the endpoint is operational.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-json","messaging-api"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["No documentation available for /api/v1/messages/176 — the actual functionality behind 'Premium API Access' is undocumented","No request or response schema provided; callers cannot know what to send or expect back","The /api, /pricing, and /README pages all returned only 'Connect wallet' with no useful content","The endpoint path '/messages/176' suggests a specific resource ID, which may return static content rather than a dynamic service"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/176","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/176","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, there is no documentation for what this specific endpoint does, no request/response schema, no examples, and the crawled pages beyond the homepage returned only 'Connect wallet' with no useful content. The endpoint's actual functionality is 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'/request':11,26,151 '0.02':10,25,67,81,150 '000':73 '20':72 '402 payment API' '6':79 'Base network API' 'USDC API' 'accept':46,198 'access':62,194 'advertis':105 'ai':117 'analysi':121 'analyt':111 'api':5,20,38,61,83,107,193 'application/json':203 'avail':188 'base':8,23,51,74,160 'behind':166 'beyond':189 'broader':103 'call':4,19,69 'categori':108 'challeng':206 'classif':124 'confirm':213 'content':177 'convers':141 'cost':64 'data':110,114 'decim':80 'document':181 'embed':125 'endpoint':55,144,171,197,215 'estim':135 'exchang':130 'export':115 'feed':129 'financ':126 'form':212 'function':165 'gas':134 'generat':142 'generic':191 'geocod':139 'header':101 'includ':109 'individu':95 'infrastructur':137 'insight':116 'key':84 'l2':161 'label':195 'learn':119 'limit':86 'list':58,146 'live':208 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':118 'maxamountrequir':70 'messag':175 'messaging-api' 'metric':112 'micropayment API' 'multipl':106 'name':172 'network':9,24,52,162 'no-api-key' 'oper':217 'paid':94 'pay':2,17,35 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':34 'payment':15,30,48,100 'per':3,18,36,68 'platform':6,21,39,104 'point':153 'post':199 'post-json' 'premium':60,192 'price':128,152 'protocol':44 'quot':133 'rate':85,131 'report':113 'request':37,92,182,200 'requir':90 'resourc':178 'respons':185 'return':202 'schema':183,186 'sentiment':120 'settl':155 'specif':54,164 'subscript':88 'suggest':173 'summar':123 'text':122 'token':132 'unclear':169 'unit':75 'usdc':14,29,47,77,157 'usdc-base-network' 'use':41 'util':138 'valid':140 'via':12,27,96 'web3':127 'well':211 'well-form':210 'x':99 'x-payment':98 'x402':13,28,43,205 'x402 API' 'x402-payment'","prices":[{"id":"e5608284-fec2-4b5c-9f53-d321e0324fd9","listingId":"10a0a216-77c5-42cf-8da4-2556fc2b6b7e","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/176","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.276Z"}],"sources":[{"listingId":"10a0a216-77c5-42cf-8da4-2556fc2b6b7e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/176","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.276Z","lastSeenAt":"2026-04-22T02:32:06.599Z"}],"details":{"listingId":"10a0a216-77c5-42cf-8da4-2556fc2b6b7e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/176 \\\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 network","source_url":"https://lowpaymentfee.com/api/v1/messages/176"},{"claim":"All endpoints are listed at $0.02/request with no API keys, no rate limits, and instant access on Base network","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 is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/176"}],"useCases":["Accessing premium content or messages via a single micropayment","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to various data and utility endpoints"],"bestFor":["AI agents that need keyless, instant API access with crypto micropayments","Developers wanting to test x402 protocol integrations on Base","Use cases requiring low-friction, per-call billing without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.312Z"},"updatedAt":"2026-04-22T02:32:06.599Z"}}