{"id":"9a06e631-12a7-4b1f-af6d-365658faf3c6","shortId":"uSbmZw","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 exposes a broad catalog of endpoints across four 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 are priced at $0.02 per request, payable in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint `/api/v1/inbox/78` is listed as \"Premium API Access\" and was probed live, returning a valid 402 challenge. Its maxAmountRequired is 20,000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site's advertised flat pricing. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" scheme, with a 300-second timeout.\n\nDocumentation is minimal: the landing page lists available endpoints and pricing, but there is no OpenAPI spec, no request/response schema documentation, and no usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a \"Connect wallet\" prompt with no additional content. The purpose of the `/api/v1/inbox/78` path specifically (as opposed to the named endpoints like `/api/v2/ai/sentiment`) is unclear — it may be a generic or custom inbox endpoint. Without further documentation, the exact input format and response structure cannot be confirmed.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","exchange-rates","gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no api key","serverless api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific path /api/v1/inbox/78 is not listed among the named endpoints on the landing page — its purpose is unclear","All non-root pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no useful content","No request or response examples are available; input format is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/78","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/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response documentation, no examples, and the specific purpose of /api/v1/inbox/78 is unclear. The crawled pages beyond the landing page are empty. This is effectively a stub 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'/api/v1/inbox/78':122,221 '/api/v2/ai/sentiment':231 '/pricing':202 '/readme':204 '/request':19,38 '0.02':18,37,95,151 '000':142 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':165 '20':141 '300':172 '402':136 '6':147 'access':128 'across':54 'addit':215 'address':164 'advertis':157 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,110,127 'avail':182 'base':8,27,103,143 'base network api' 'broad':50 'call':4,23 'cannot':253 'catalog':51 'categori':56 'challeng':137 'classif':71 'classification' 'commit':118 'confirm':255 'connect':210 'consist':152 'content':216 'convers':88 'conversion' 'custom':240 'data':11,30,57,61 'data-analytics' 'decim':148 'document':175,195,245 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,121,183,229,242 'equal':150 'estim':82 'exact':168,247 'exampl':199 'exchang':77 'exchange-rates' 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'flat':158 'format':249 'four':55 'gas':81 'gas-estimates' 'generat':89 'generic':238 'geocod':86 'geocoding' 'inbox':241 'infrastructur':84 'input':248 'insight':63 'key':111 'land':179 'learn':66 'like':230 'limit':114 'list':124,181 'live':132 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'maxamountrequir':139 'may':235 'metric':59 'micropayment api' 'minim':177 'name':228 'network':104 'no api key' 'offer':10,29 'openapi':190 'oppos':225 'page':180,205 'path':222 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payabl':98 'payment':160 'per':3,22,96 'platform':6,25,46 'premium':126 'price':75,93,159,185 'probe':131 'prompt':212 'protocol':108 'purpos':218 'quot':80 'rate':78,113 'report':60 'request':97 'request/response':193 'resolv':207 'respons':251 'return':133 'schema':194 'scheme':169 'second':173 'sent':162 'sentiment':67 'sentiment-analysis' 'serverless api' 'site':155 'spec':191 'specif':120,223 'structur':252 'summar':70 'text':69 'text-summarization' 'timeout':174 'token':79 'unclear':233 'unit':144 'upfront':117 'usag':198 'usdc':9,28,100,146 'usdc api' 'usdc-base' 'use':166 'util':15,34,85 'valid':87,135 'validation' 'via':105 'wallet':211 'web3':74 'without':243 'x402':43,107 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"a65d55f6-2c7a-4b74-a7fe-d3fbe6f16469","listingId":"9a06e631-12a7-4b1f-af6d-365658faf3c6","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/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:22.203Z"}],"sources":[{"listingId":"9a06e631-12a7-4b1f-af6d-365658faf3c6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/78","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:22.203Z","lastSeenAt":"2026-04-22T09:02:13.348Z"}],"details":{"listingId":"9a06e631-12a7-4b1f-af6d-365658faf3c6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/78 \\\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":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/78"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Calling AI inference endpoints (sentiment, summarization, classification, embeddings) without managing API keys or subscriptions","Fetching real-time financial data like token quotes, exchange rates, and gas estimates on a per-request basis","Running utility operations such as geocoding, data validation, and format conversion with instant crypto-settled access","Exporting analytics data and generating reports via pay-as-you-go endpoints"],"bestFor":["Agents and bots that need keyless, pay-per-call API access settled in USDC on Base","Developers prototyping with multiple API categories without upfront commitments","Web3-native applications that prefer on-chain micropayments over traditional billing"],"notFor":["High-volume production workloads where $0.02/request adds up and bulk pricing is needed","Users who require detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:07.77Z"},"updatedAt":"2026-04-22T09:02:13.348Z"}}