{"id":"79ca605c-22bb-4937-889e-7cbe8b57020c","shortId":"UAaF6w","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/inbox/155` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys or accounts are required — callers authenticate purely via the x402 payment header.\n\nThe wider 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/request pricing with no rate limits or minimum commitments.\n\nThe `/api/v1/inbox/155` endpoint itself lacks detailed documentation — there is no OpenAPI schema, no example request/response, and the crawled docs pages (pricing, README, API) all resolve to a wallet-connect prompt with no additional content. The endpoint is confirmed live via a valid 402 challenge, but what it actually returns upon successful payment is unknown from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint"],"categories":["general","api-platform"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","micropayment API","USDC API","Base network API","pay-per-call API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The specific function of /api/v1/inbox/155 ('Premium API Access') is undocumented — it is unclear what data or service it provides","All documentation pages (/api, /pricing, /README) returned only a wallet-connect prompt with no useful content","No example requests or responses are available to verify endpoint behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/155","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/155","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, but there is no OpenAPI schema, no documented request/response format, and the specific purpose of /api/v1/inbox/155 is entirely unclear. The crawled docs pages are empty beyond wallet-connect prompts. This is effectively a stub 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'/request':19,38,152 '0.02':18,37,79,151 '000':83 '20':82 '402':204 '6':89 'Base network API' 'USDC API' 'access':74 'account':95 'actual':209 'addit':194 'advertis':109 'ai':12,31,120 'analysi':124 'analyt':114 'api':5,24,45,73,92,183 'authent':99 'avail':217 'base':8,27,63,84 'broad':50 'call':4,23,81 'caller':98 'catalog':51 'categori':112 'challeng':205 'classif':127 'commit':160 'confirm':199 'connect':190 'content':195 'convers':144 'cost':76 'cover':10,29 'crawl':178 'data':11,30,113,117 'decim':90 'detail':166 'doc':179 'document':167 'embed':128 'enabl':44 'endpoint':16,35,57,67,111,147,163,197 'estim':138 'exampl':174 'exchang':133 'export':118 'feed':132 'financ':13,32,129 'four':110 'gas':137 'generat':145 'geocod':142 'header':105 'infrastructur':140 'insight':119 'key':93 'lack':165 'learn':122 'limit':157 'list':70 'live':200 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':121 'materi':218 'metric':115 'micropayment API' 'minimum':159 'network':64 'no-api-key' 'offer':48 'openapi':171 'page':180 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':104,213 'per':3,22,55,80 'platform':6,25,46,108 'post-endpoint' 'premium':72 'price':131,153,181 'prompt':191 'pure':100 'quot':136 'rate':134,156 'readm':182 'report':116 'request':56 'request/response':175 'requir':97 'resolv':185 'return':210 'schema':172 'sentiment':123 'settl':58 'share':148 'specif':66 'success':212 'summar':126 'text':125 'token':135 'unit':85 'unknown':215 'upon':211 'usdc':9,28,60,87 'usdc-base' 'util':15,34,141 'valid':143,203 'via':101,201 'wallet':189 'wallet-connect':188 'web3':130 'wider':107 'x402':43,103 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"8ebb1fef-14fc-4a57-b24d-94d311cba99d","listingId":"79ca605c-22bb-4937-889e-7cbe8b57020c","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/155","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.326Z"}],"sources":[{"listingId":"79ca605c-22bb-4937-889e-7cbe8b57020c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/155","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.326Z","lastSeenAt":"2026-04-22T04:02:32.934Z"}],"details":{"listingId":"79ca605c-22bb-4937-889e-7cbe8b57020c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/155 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/155"},{"claim":"The platform advertises $0.02/request pricing 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 generic premium API endpoint via x402 micropayments","Agent-driven API consumption without pre-registration or API keys","Testing x402 payment flows on Base with low-cost USDC transactions"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents needing keyless, pay-per-call API access","Low-cost micropayment API consumption on Base"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Applications requiring well-defined request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.195Z"},"updatedAt":"2026-04-22T04:02:32.934Z"}}