{"id":"f33c6d6d-0a06-4e83-919e-5c460521483c","shortId":"PdCdeH","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/142` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers attach an X-PAYMENT header to each request.\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 listed endpoints share the same $0.02/request pricing with no rate limits or minimum commitments.\n\nImportant caveat: the specific functionality behind `/api/v1/inbox/142` is not documented beyond the label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and the crawled docs pages (pricing, README, API) returned only a wallet-connect prompt with no additional content. Agents should treat this endpoint as opaque until further documentation is available.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["No documentation exists for the specific endpoint /api/v1/inbox/142 — its actual functionality is unknown","No OpenAPI or JSON schema is provided for request or response formats","Docs, pricing, and README pages all returned only a wallet-connect prompt with no content","The endpoint name 'Premium API Access' is generic and does not describe a concrete capability"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/142","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/142","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and no documentation explaining what /api/v1/inbox/142 actually does. The crawled pages beyond the landing page returned only wallet-connect prompts with no useful 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'/request':19,38,164 '0.02':18,37,80,163 '000':84 '20':83 '6':90 'access':75,188 'account':102 'addit':214 'advertis':120 'agent':216 'ai':12,31,131 'analysi':135 'analyt':125 'api':5,24,45,74,100,187,204 'attach':108 'avail':227 'base':8,27,63,85 'base network api' 'base-network' 'behind':178 'beyond':183 'broad':50 'call':4,23,82 'caller':107 'catalog':51 'categori':123 'caveat':174 'classif':138 'commit':172 'connect':210 'content':215 'convers':155 'cost':77 'crawl':199 'data':11,30,124,128 'decim':91 'doc':200 'document':182,225 'embed':139 'enabl':44 'endpoint':16,35,57,67,122,159,220 'estim':149 'exampl':196 'exchang':144 'export':129 'feed':143 'financ':13,32,140 'four':121 'function':177 'gas':148 'generat':156 'geocod':153 'handl':94 'header':113 'import':173 'infrastructur':151 'insight':130 'json-response' 'key':101 'label':185 'learn':133 'limit':169 'list':71,158 'low payment fee' 'lowpaymentfee.com':39 'machin':132 'metric':126 'micropayment api' 'minimum':171 'network':64 'no-api-key' 'offer':10,29 'opaqu':222 'openapi':192 'page':201 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':92,112 'per':3,22,55,81 'platform':6,25,46,119 'post-method' 'premium':73,186 'premium api access' 'price':142,165,202 'prompt':211 'protocol':98 'provid':48 'quot':147 'rate':145,168 'readm':203 'report':127 'request':56,116 'request/response':195 'requir':106 'return':205 'schema':193 'sentiment':134 'settl':58 'share':160 'specif':66,176 'subscript':104 'summar':137 'text':136 'token':146 'treat':218 'unit':86 'usdc':9,28,60,88 'usdc api' 'usdc-settlement' 'util':15,34,152 'valid':154 'via':95 'wallet':209 'wallet-connect':208 'web3':141 'wider':118 'x':111 'x-payment':110 'x402':43,97 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"635155e8-20cf-4d72-8089-adb4811371bc","listingId":"f33c6d6d-0a06-4e83-919e-5c460521483c","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/142","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.593Z"}],"sources":[{"listingId":"f33c6d6d-0a06-4e83-919e-5c460521483c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/142","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.593Z","lastSeenAt":"2026-04-22T13:32:22.531Z"}],"details":{"listingId":"f33c6d6d-0a06-4e83-919e-5c460521483c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/142 \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/142"},{"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/142"}],"useCases":["Programmatic access to a pay-per-call API without needing an account or API key","Agent-driven workflows that settle per-request costs in USDC on Base","Integrating low-cost utility or data endpoints into automated pipelines"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto-native micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring guaranteed SLAs or enterprise support","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.742Z"},"updatedAt":"2026-04-22T13:32:22.531Z"}}