{"id":"34fc2714-ad7f-4207-8ee9-6057990d4b83","shortId":"amGKPt","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 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.\n\nThe specific endpoint `/api/v1/inbox/1` is listed as \"Premium API Access\" and its 402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no commitments required — callers simply attach an X-PAYMENT header to each POST request.\n\nDocumentation is minimal: the landing page lists available endpoints and pricing, but the /api, /pricing, and /README pages all resolve to a wallet-connect stub with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The purpose of the `/api/v1/inbox/1` endpoint specifically is unclear — it does not appear in the public catalog on the landing page, so its functionality cannot be confirmed from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["llm","data","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["The /api/v1/inbox/1 endpoint does not appear in the provider's public API catalog; its purpose is undocumented.","No OpenAPI spec, request schema, or response schema is available for any endpoint.","The /api, /pricing, and /README pages all resolve to a wallet-connect stub with no usable content.","Without documentation it is impossible to verify what data or service this endpoint actually provides."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/1","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/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page catalog, and the specific /api/v1/inbox/1 endpoint is not listed in the public catalog — its actual functionality is 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'/api/v1/inbox/1':116,227 '/pricing':193 '/readme':195 '/request':19,38 '0.02':18,37,99,142 '000':132 '0x8335':137 '20':131 '402':125 '402 payment api' '6':146 'access':122 'across':58 'advertis':127 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,121,158 'appear':235 'attach':169 'avail':186,251 'base':8,27,107,133,139 'base network api' 'broad':50 'call':4,23 'caller':167 'cannot':247 'catalog':51,239 'categori':60 'challeng':126 'classif':75 'classification' 'commit':165 'confirm':249 'connect':203 'convers':92 'data':11,30,61,65 'data-analytics' 'decim':147 'detail':209 'document':179,218 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,115,187,228 'equal':141 'estim':86 'exact':154 'exampl':222 'exchang':81 'export':66 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'function':246 'gas':85 'generat':93 'geocod':90 'geocoding' 'given':143 'header':174 'infrastructur':88 'insight':67 'key':159 'land':183,242 'learn':70 'limit':162 'list':118,185 'low payment fee' 'lowpaymentfee.com':39 'machin':69 'made':150 'materi':252 'maxamountrequir':129 'metric':63 'micropayment api' 'minim':181 'network':108 'offer':10,29 'openapi':213 'page':184,196,243 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payabl':102 'payment':148,173 'per':3,22,55,100 'platform':6,25,46 'post':177 'premium':120 'price':79,97,189 'protocol':112 'provid':48 'public':238 'purpos':224 'quot':84 'rate':82,161 'report':64 'request':56,101,178 'request/response':216 'requir':166 'resolv':198 'schema':217 'scheme':155 'sentiment':71 'sentiment-analysis' 'simpli':168 'spec':214 'specif':114,229 'stub':204 'summar':74 'technic':208 'text':73 'text-summarization' 'token':83 'unclear':231 'unit':134 'usag':221 'usdc':9,28,104,136,144 'usdc api' 'usdc-base' 'util':15,34,89 'utility-apis' 'valid':91 'via':109,151 'wallet':202 'wallet-connect':201 'web3':78 'x':172 'x-payment':171 'x402':43,111,153 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"64395fee-8068-475d-b37a-0c8e8b03f61e","listingId":"34fc2714-ad7f-4207-8ee9-6057990d4b83","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/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.146Z"}],"sources":[{"listingId":"34fc2714-ad7f-4207-8ee9-6057990d4b83","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.146Z","lastSeenAt":"2026-04-22T12:05:14.952Z"}],"details":{"listingId":"34fc2714-ad7f-4207-8ee9-6057990d4b83","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/1 \\\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 landing page lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/inbox/1 shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/inbox/1"},{"claim":"The site advertises no API keys, no rate limits, instant access, and Base network settlement.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations like geocoding, validation, and data conversion with instant crypto-settled payments","Integrating pay-per-use data analytics and reporting into agent workflows"],"bestFor":["Developers wanting zero-commitment, keyless API access paid in USDC","AI agents that need on-demand inference endpoints with micropayment settlement","Web3 applications needing financial data feeds with crypto-native billing"],"notFor":["Users who need high-volume bulk access with subscription-based pricing","Developers requiring detailed API documentation, SDKs, or OpenAPI specs before integration","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.519Z"},"updatedAt":"2026-04-22T12:05:14.952Z"}}