{"id":"3f67e22a-f250-4e1d-b5ae-727d5a036bbc","shortId":"dFa5DF","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, paid in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/inbox/197` is listed as \"Premium API Access\" and its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made per-call with no API keys, no rate limits, and no minimum commitments required. The x402 challenge specifies a POST method with a 300-second timeout.\n\nDocumentation is minimal — the site's /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The purpose and behavior of the `/api/v1/inbox/197` endpoint specifically is unclear; it may be a generic inbox or messaging endpoint, but this is not documented. The broader platform lists 16 endpoints across the four categories, all at the same price point.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","post-api","no-api-key","pay-per-use"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose of /api/v1/inbox/197 ('Premium API Access') is undocumented and unclear","All documentation pages (/api, /pricing, /README) return only a wallet-connect prompt with no content","No request or response examples are available; input format is unknown","The platform lists 16 endpoints but none have documented schemas or usage guides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/197","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/197","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is no OpenAPI spec, no request/response schema, no documentation for the specific inbox/197 endpoint, and the /api, /pricing, and /README pages are empty. The endpoint's actual functionality is 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'/api/v1/inbox/197':116,217 '/pricing':181 '/readme':183 '/request':19,38 '0.02':18,37,99,143 '000':132 '0x8335':137 '16':240 '20':131 '2913':138 '300':171 'Base network API' 'USDC API' 'access':122 'across':58,242 'advertis':127 'ai':12,31,68 'analysi':72 'analyt':62 'api':5,24,45,121,152 'avail':210 'base':8,27,107,133,140 'behavior':214 'broad':50 'broader':237 'call':4,23,149 'catalog':51 'categori':60,245 'challeng':126,164 'classif':75 'commit':160 'connect':191 'content':196 'convers':92 'data':11,30,61,65 'document':174,205,235 'embed':76 'enabl':44 'endpoint':16,35,57,95,115,218,230,241 'equal':142 'estim':86 'exampl':209 'exchang':81 'export':66 'feed':80 'financ':13,32,77 'four':59,244 'gas':85 'generat':93 'generic':226 'geocod':90 'inbox':227 'infrastructur':88 'insight':67 'key':153 'learn':70 'limit':156 'list':118,239 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'made':146 'maxamountrequir':129 'may':223 'messag':229 'method':168 'metric':63 'micropayment API' 'minim':176 'minimum':159 'network':108 'no-api-key' 'offer':10,29 'openapi':200 'page':184 'paid':102 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'pay-per-use' 'payment':144 'per':3,22,55,100,148 'per-cal':147 'per-request-billing' 'platform':6,25,46,238 'point':251 'post':167 'post-api' 'premium':120 'price':79,97,250 'prompt':192 'protocol':112 'provid':48 'purpos':212 'quot':84 'rate':82,155 'report':64 'request':56,101 'request/response':203 'requir':161 'resolv':186 'schema':204 'second':172 'sentiment':71 'site':178 'spec':201 'specif':114,219 'specifi':165 'summar':74 'text':73 'timeout':173 'token':83 'unclear':221 'unit':134 'usag':208 'usdc':9,28,104,136 'usdc-base' 'util':15,34,89 'valid':91 'via':109 'wallet':190 'wallet-connect':189 'web3':78 'x402':43,111,125,163 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"3892c349-6281-45ab-ad6f-e215bda6bcec","listingId":"3f67e22a-f250-4e1d-b5ae-727d5a036bbc","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/197","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.644Z"}],"sources":[{"listingId":"3f67e22a-f250-4e1d-b5ae-727d5a036bbc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/197","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.644Z","lastSeenAt":"2026-04-22T13:02:16.337Z"}],"details":{"listingId":"3f67e22a-f250-4e1d-b5ae-727d5a036bbc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/197 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\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 the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/inbox/197 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/inbox/197"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to data analytics, AI inference, finance data, or utility services without API key management","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Prototyping or low-volume usage where per-request pricing avoids subscription overhead"],"bestFor":["Developers or agents wanting zero-commitment, pay-as-you-go API access","x402-compatible clients on the Base network","Low-volume or bursty workloads where $0.02/request is cost-effective"],"notFor":["High-volume production workloads where per-request costs add up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.736Z"},"updatedAt":"2026-04-22T13:02:16.337Z"}}