{"id":"0340ca3a-b293-4c4b-95c7-a02643305abb","shortId":"86L3ht","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/110` 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 accounts are required — callers authenticate and pay via the x402 payment protocol by including an X-PAYMENT header with each request.\n\nThe platform advertises four categories of APIs: 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 per-request pricing with no minimums, commitments, or rate limits.\n\nImportant caveat: the `/api/v1/inbox/110` endpoint probed here does not clearly map to any of the named API categories on the landing page. Its purpose is described only as \"Premium API Access\" with no further documentation, input schema, or example responses available. The broader platform pages (pricing, README, API docs) returned only a \"Connect wallet\" prompt with no substantive content. Treat this endpoint's actual functionality as unknown until the provider publishes documentation.","tags":[],"capabilities":["x402-payment","usdc-base-settlement","pay-per-request","no-api-key","no-rate-limit","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["The specific endpoint /api/v1/inbox/110 is not listed among the named APIs on the landing page; its actual functionality is undocumented.","All documentation pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no content.","No OpenAPI spec, input schema, or example responses are available for any endpoint.","The platform lists many endpoint categories but none have been independently verified to return useful data."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/110","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/110","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation for what /api/v1/inbox/110 actually does, no input/output schema, no examples, and the broader site docs pages are empty. The endpoint's purpose is effectively 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'/request':19,38 '0.02':18,37,80,164 '000':84 '20':83 '402 payment api' '6':90 'access':75,206 'account':96 'actual':239 'advertis':120 'ai':12,31,132 'ai-inference' 'analysi':136 'analyt':126 'api':5,24,45,74,93,124,192,205,223 'authent':100 'avail':216 'base':8,27,63,85 'base network api' 'broad':50 'broader':218 'call':4,23 'caller':99 'catalog':51 'categori':122,193 'caveat':177 'classif':139 'clear':185 'commit':172 'connect':228 'content':234 'convers':156 'cost':77 'data':11,30,125,129 'data-analytics' 'decim':91 'describ':201 'doc':224 'document':210,247 'embed':140 'enabl':44 'endpoint':16,35,57,67,160,180,237 'estim':150 'exampl':214 'exchang':145 'export':130 'feed':144 'financ':13,32,141 'finance-data' 'four':121 'function':240 'gas':149 'generat':157 'geocod':154 'header':114 'import':176 'includ':109 'infrastructur':152 'input':211 'insight':131 'key':94 'land':196 'learn':134 'limit':175 'list':71,159 'low payment fee' 'lowpaymentfee.com':39 'machin':133 'map':186 'metric':127 'micropayment api' 'minimum':171 'name':191 'network':64 'no-api-key' 'no-rate-limit' 'offer':10,29 'page':197,220 'pay':2,21,54,102 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':106,113 'per':3,22,55,81,166 'per-request':165 'platform':6,25,46,119,219 'premium':73,204 'price':143,168,221 'probe':181 'prompt':230 'protocol':107 'provid':48,245 'publish':246 'purpos':199 'quot':148 'rate':146,174 'readm':222 'report':128 'request':56,82,117,167 'requir':98 'respons':215 'return':225 'schema':212 'sentiment':135 'settl':58 'share':161 'specif':66 'substant':233 'summar':138 'text':137 'token':147 'treat':235 'unit':86 'unknown':242 'usdc':9,28,60,88 'usdc api' 'usdc-base-settlement' 'util':15,34,153 'utility-services' 'valid':155 'via':103 'wallet':229 'web3':142 'x':112 'x-payment':111 'x402':43,105 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"31dd9b11-56fa-4433-ad25-a75fa7d79a2c","listingId":"0340ca3a-b293-4c4b-95c7-a02643305abb","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/110","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:19.771Z"}],"sources":[{"listingId":"0340ca3a-b293-4c4b-95c7-a02643305abb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/110","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:19.771Z","lastSeenAt":"2026-04-22T11:32:55.085Z"}],"details":{"listingId":"0340ca3a-b293-4c4b-95c7-a02643305abb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/110 \\\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/110"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/110"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Four API categories listed: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without managing API keys or subscriptions","Programmatic access to AI inference (sentiment, summarization, classification, embeddings) with per-call billing","Fetching real-time financial data (prices, exchange rates, gas estimates) with micropayments","Utility operations like geocoding, validation, and data conversion paid per request"],"bestFor":["AI agents needing keyless, pay-as-you-go API access","Developers who want to avoid subscription commitments for low-volume usage","Crypto-native applications already operating on the Base network"],"notFor":["High-volume production workloads where $0.02/request adds up quickly compared to subscription APIs","Users who need detailed documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:10.044Z"},"updatedAt":"2026-04-22T11:32:55.085Z"}}