{"id":"9184b4af-7f19-4de8-90c3-c9f604b8c956","shortId":"KG9kpv","kind":"x402","title":"Pay-per-call API platform on Base network — $0.02/request via x402 with USDC.","tagline":"Pay-per-call API platform on Base network — $0.02/request via x402 with USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that gates access to a broad set of endpoints using the x402 payment protocol. Each call costs $0.02 in USDC on the Base network, with no API keys, no rate limits, and no subscriptions required. The specific endpoint `/api/v1/inbox/120` is listed as \"Premium API Access\" and follows the same x402 payment pattern.\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 endpoints are priced uniformly at $0.02 per request.\n\nThe probed endpoint at `/api/v1/inbox/120` returned a valid x402 challenge with `maxAmountRequired` of 20000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The endpoint accepts POST requests and returns `application/json`. Note: the specific functionality behind the `/api/v1/inbox/120` path is not documented on the site — it does not appear in the listed API catalog, so its exact purpose is unclear.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","json-response","post-method","data-analytics","ai-inference","finance-data","utility-services"],"categories":["general","llm","finance","geo"],"synonyms":["pay per call API","micropayment API","x402 API","USDC API access","Base network API","low fee API","crypto payment API"],"warnings":["The endpoint /api/v1/inbox/120 does not appear in the site's listed API catalog — its specific functionality is undocumented.","No OpenAPI spec, request schema, or response schema is available.","The /pricing, /api, and /README pages returned no meaningful content (only 'Connect wallet').","The breadth of advertised APIs (AI, finance, analytics, utilities) could not be independently verified — only the x402 challenge on this single endpoint was confirmed live."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/120","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/120","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 pricing is clear ($0.02 USDC on Base). However, the specific endpoint /api/v1/inbox/120 is not documented anywhere on the site, there is no OpenAPI schema, no request/response examples, and the crawled docs/pricing/README pages returned only 'Connect wallet' with no useful content. The endpoint's actual functionality is 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'/request':11,26 '0.02':10,25,57,138,164 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':179 '0x8335':159 '20000':154 '6':168 'Base network API' 'USDC API access' 'accept':182 'access':42,84 'address':178 'advertis':94 'ai':106 'ai-inference' 'analysi':110 'analyt':100 'api':5,20,38,66,83,98,209 'appear':205 'application/json':187 'base':8,23,62,155,161 'behind':192 'broad':45 'call':4,19,55 'catalog':210 'categori':96 'challeng':150 'classif':113 'convers':130 'cost':56 'crypto payment API' 'data':99,103 'data-analytics' 'decim':169 'document':198 'embed':114 'endpoint':48,77,133,143,181 'equal':163 'estim':124 'exact':175,213 'exchang':119 'export':104 'feed':118 'financ':115 'finance-data' 'follow':86 'four':95 'function':191 'gas':123 'gate':41 'generat':131 'geocod':128 'given':165 'infrastructur':126 'insight':105 'json-response' 'key':67 'learn':108 'limit':70 'list':80,208 'low fee API' 'lowpaymentfee.com':31 'machin':107 'made':172 'maxamountrequir':152 'metric':101 'micropayment API' 'network':9,24,63 'no-api-key' 'note':188 'path':195 'pattern':91 'pay':2,17,35 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':34 'payment':52,90,170 'per':3,18,36,139 'platform':6,21,39,93 'post':183 'post-method' 'premium':82 'price':117,135 'probe':142 'protocol':53 'purpos':214 'quot':122 'rate':69,120 'report':102 'request':37,140,184 'requir':74 'return':146,186 'scheme':176 'sentiment':109 'set':46 'site':201 'specif':76,190 'subscript':73 'summar':112 'text':111 'token':121 'unclear':216 'uniform':136 'unit':156 'usdc':15,30,59,158,166 'usdc-base' 'use':49 'util':127 'utility-services' 'valid':129,148 'via':12,27,173 'web3':116 'x402':13,28,51,89,149 'x402 API' 'x402-payment'","prices":[{"id":"96e5db24-f6f8-4fb7-b723-7a139bb08346","listingId":"9184b4af-7f19-4de8-90c3-c9f604b8c956","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/120","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.580Z"}],"sources":[{"listingId":"9184b4af-7f19-4de8-90c3-c9f604b8c956","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/120","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.580Z","lastSeenAt":"2026-04-22T04:02:33.209Z"}],"details":{"listingId":"9184b4af-7f19-4de8-90c3-c9f604b8c956","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/120 \\\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 platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/inbox/120 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/inbox/120"},{"claim":"Listed API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without subscriptions","Fetching real-time financial data like token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, validation, and data conversion on demand","Exporting analytics data and generating reports with per-request billing"],"bestFor":["Agents or developers who want instant API access without signup or API keys","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions","Crypto-native applications that can pay with USDC on Base"],"notFor":["High-volume production workloads where per-request costs add up quickly","Users who cannot transact in USDC on the Base network","Applications requiring detailed documentation or SLAs — docs are minimal"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.846Z"},"updatedAt":"2026-04-22T04:02:33.209Z"}}