{"id":"188b8425-3bd4-4e1d-9eb0-f343fb7b8cdc","shortId":"6JG4pq","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 suite 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.\n\nThe specific endpoint `/api/v1/inbox/32` is listed as \"Premium API Access\" and carries a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 — consistent with the site-wide pricing. Payment is made per-call via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The x402 challenge was confirmed live, returning a proper 402 with version 1 challenge.\n\nDocumentation is minimal: the landing page lists available endpoints and pricing, but the /api, /pricing, and /README pages all resolve to a bare \"Connect wallet\" prompt 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/32` path specifically (as opposed to the named category endpoints) is unclear — it may be a generic or catch-all premium endpoint, but this is not documented.","tags":[],"capabilities":["x402-payment","per-call-pricing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","text-classification","embeddings","finance-data","exchange-rates","gas-estimates","geocoding","validation","conversion"],"categories":["llm","data","finance","geo","infrastructure"],"synonyms":["low payment fee","pay per call API","x402 API","USDC API","Base network API","micropayment API","cheap API","no-auth API"],"warnings":["No OpenAPI spec or request/response schema available","The specific endpoint /api/v1/inbox/32 ('Premium API Access') has no documentation explaining what it does or what input it expects","All documentation pages (/api, /pricing, /README) resolve to a bare 'Connect wallet' page with no content","The breadth of advertised capabilities (AI, finance, geocoding, etc.) cannot be verified from available documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/32","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/32","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/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/inbox/32 is undocumented. The /api, /pricing, and /README pages are all empty wallet-connect 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'/api/v1/inbox/32':112,231 '/pricing':197 '/readme':199 '/request':19,38 '0.02':18,37,95,138 '000':125 '0x8335':130 '1':181 '20':124 '2913':131 '402':178 '6':134 'Base network API' 'USDC API' 'access':118 'across':54 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,117,159 'avail':190 'bare':205 'base':8,27,103,126,133 'broad':50 'call':4,23,151 'carri':120 'catch':250 'catch-al':249 'categori':56,239 'challeng':171,182 'cheap API' 'classif':71 'commit':167 'confirm':173 'connect':206 'consist':139 'convers':88 'conversion' 'data':11,30,57,61 'data-analytics' 'decim':135 'detail':213 'document':183,222,258 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,191,240,253 'equal':137 'estim':82 'exact':155 'exampl':226 'exchang':77 'exchange-rates' 'export':62 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'gas':81 'gas-estimates' 'generat':89 'generic':247 'geocod':86 'geocoding' 'infrastructur':84 'insight':63 'key':160 'land':187 'learn':66 'limit':163 'list':114,189 'live':174 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':148 'maxamountrequir':122 'may':244 'metric':59 'micropayment API' 'minim':185 'name':238 'network':104 'no-auth API' 'offer':10,29 'openapi':217 'oppos':235 'page':188,200 'path':232 'pay':2,21 'pay per call API' 'pay-per-cal':1,20 'payabl':98 'payment':146 'per':3,22,96,150 'per-cal':149 'per-call-pricing' 'platform':6,25,46 'premium':116,252 'price':75,93,145,193 'prompt':208 'proper':177 'protocol':108 'provid':48 'purpos':228 'quot':80 'rate':78,162 'report':60 'request':97 'request/response':220 'requir':168 'resolv':202 'return':175 'schema':221 'scheme':156 'sentiment':67 'sentiment-analysis' 'site':143 'site-wid':142 'spec':218 'specif':110,233 'suit':51 'summar':70 'technic':212 'text':69 'text-classification' 'text-summarization' 'token':79 'unclear':242 'unit':127 'upfront':166 'usag':225 'usdc':9,28,100,129 'usdc-base' 'util':15,34,85 'valid':87 'validation' 'version':180 'via':105,152 'wallet':207 'web3':74 'wide':144 'x402':43,107,154,170 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"54ebcf74-9863-4a54-b382-b743ddbcdb44","listingId":"188b8425-3bd4-4e1d-9eb0-f343fb7b8cdc","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/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.739Z"}],"sources":[{"listingId":"188b8425-3bd4-4e1d-9eb0-f343fb7b8cdc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/32","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.739Z","lastSeenAt":"2026-04-22T04:02:46.163Z"}],"details":{"listingId":"188b8425-3bd4-4e1d-9eb0-f343fb7b8cdc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/32 \\\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":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/32"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto gas estimates or token price quotes with per-call payment","Geocoding or data validation as a utility service paid per request via x402","Exporting analytics data or generating reports on a pay-as-you-go basis"],"bestFor":["AI agents that need low-friction, keyless API access on Base","Developers wanting simple per-call pricing without subscriptions","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume batch processing where $0.02/call adds up quickly","Users who need detailed API documentation, SDKs, or OpenAPI specs before integrating","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.969Z"},"updatedAt":"2026-04-22T04:02:46.163Z"}}