{"id":"727ab707-9fa9-4401-8246-c35fcc9eaac6","shortId":"hMMfz2","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/83` is listed as \"Premium API Access\" and costs up to $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys or rate limits are advertised; callers simply attach an x402 payment header to each POST request.\n\nThe wider platform advertises four categories of endpoints: 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.\n\nHowever, the specific functionality behind the `/api/v1/inbox/83` path is unclear — the description is simply \"Premium API Access\" with no further documentation, input schema, or example responses available. The crawled docs pages (pricing, README, API) all returned only a \"Connect wallet\" prompt with no additional content. Without an OpenAPI spec or detailed documentation, callers cannot determine what data or service this particular endpoint returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"warnings":["No documentation exists for the /api/v1/inbox/83 endpoint — its actual functionality is unknown","No OpenAPI or input/output schema is provided","Docs, pricing, and README pages all returned only 'Connect wallet' with no content","The endpoint path 'inbox/83' suggests a user-specific or dynamic resource rather than a general-purpose API"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/83","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/inbox/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge), but there is no OpenAPI spec, no documentation of what /api/v1/inbox/83 actually does, no input/output schema, and no example responses. The crawled pages beyond the landing page were empty. The listing is effectively a stub with only pricing and payment metadata 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'/request':19,38,159 '0.02':18,37,80,158 '000':84 '20':83 '6':90 'Base network API' 'USDC API' 'access':75,177 'addit':204 'advertis':99,114 'ai':12,31,126 'analysi':130 'analyt':120 'api':5,24,45,74,93,176,194 'attach':102 'avail':187 'base':8,27,63,85 'base-network' 'behind':165 'broad':50 'call':4,23 'caller':100,213 'cannot':214 'catalog':51 'categori':116 'classif':133 'connect':199 'content':205 'convers':150 'cost':77 'crawl':189 'data':11,30,119,123,217 'decim':91 'descript':172 'detail':211 'determin':215 'doc':190 'document':181,212 'embed':134 'enabl':44 'endpoint':16,35,57,67,118,154,222 'estim':144 'exampl':185 'exchang':139 'export':124 'feed':138 'financ':13,32,135 'four':115 'function':164 'gas':143 'generat':151 'geocod':148 'header':106 'howev':161 'infrastructur':146 'input':182 'insight':125 'key':94 'learn':128 'limit':97 'list':71,153 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':127 'metric':121 'micropayment API' 'network':64 'no-api-key' 'offer':10,29 'openapi':208 'page':191 'particular':221 'path':168 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':105 'per':3,22,55,81 'platform':6,25,46,113 'post':109 'post-endpoint' 'premium':73,175 'price':137,160,192 'prompt':201 'provid':48 'quot':142 'rate':96,140 'readm':193 'report':122 'request':56,82,110 'respons':186 'return':196,223 'schema':183 'sentiment':129 'servic':219 'settl':58 'share':155 'simpli':101,174 'spec':209 'specif':66,163 'summar':132 'text':131 'token':141 'unclear':170 'unit':86 'usdc':9,28,60,88 'usdc-settlement' 'util':15,34,147 'valid':149 'wallet':200 'web3':136 'wider':112 'without':206 'x402':43,104 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"89201976-0464-4883-8594-4ec9ccdf070d","listingId":"727ab707-9fa9-4401-8246-c35fcc9eaac6","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/inbox/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:22.314Z"}],"sources":[{"listingId":"727ab707-9fa9-4401-8246-c35fcc9eaac6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/83","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:22.314Z","lastSeenAt":"2026-04-22T10:02:57.769Z"}],"details":{"listingId":"727ab707-9fa9-4401-8246-c35fcc9eaac6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/83 \\\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 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/83"},{"claim":"All listed endpoints cost $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 offers endpoints 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/inbox/83"}],"useCases":["Programmatic access to paid API services without managing API keys or subscriptions","Agent-driven workflows that need on-demand API calls settled via crypto micropayments","Testing x402 payment flows against a live endpoint on Base"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle USDC payments on Base per request","Prototyping x402 payment integrations"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume use cases where per-request crypto settlement overhead is impractical","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:07.579Z"},"updatedAt":"2026-04-22T10:02:57.769Z"}}