{"id":"492ccd9f-9a77-4a9f-aa91-b4eaaf96f62f","shortId":"PgUy3v","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API marketplace that exposes a broad set 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, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/messages/51` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with a 300-second timeout. No API keys or rate limits are advertised; access is instant once payment is included in the X-PAYMENT header.\n\nDocumentation is minimal — the landing page lists available endpoints and pricing but provides no request/response schemas, parameter descriptions, or usage examples. The `/api`, `/pricing`, and `/README` pages all returned only a \"Connect wallet\" prompt with no additional content. Because of this, the actual behavior of `/api/v1/messages/51` (what it accepts and returns) is unknown beyond the generic \"Premium API Access\" label.","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 marketplace","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No API documentation, request parameters, or response schema available for /api/v1/messages/51","The specific purpose of the 'messages/51' endpoint is unclear — 'Premium API Access' is a generic label","The /pricing, /api, and /README pages returned no useful content beyond a wallet connect prompt","No OpenAPI spec, ai-plugin manifest, or agents.txt discovered"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/51","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/messages/51","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, no examples, and the purpose of /api/v1/messages/51 specifically is unexplained. The site's non-landing pages returned only 'Connect wallet' with no useful 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'/api/v1/messages/51':112,224 '/pricing':202 '/readme':204 '/request':19,38 '0.02':18,37,95,139 '000':128 '0x8335':133 '20':127 '2913':134 '300':155 '402':122 '6':143 'accept':227 'access':118,166,237 'across':54 'actual':221 'addit':215 'advertis':165 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,117,159,236 'avail':186 'base':8,27,103,129,136 'base network api' 'behavior':222 'beyond':232 'broad':50 'call':4,23 'categori':56 'challeng':123 'classif':71 'classification' 'connect':210 'content':216 'convers':88 'cover':10,29 'data':11,30,57,61 'data-analytics' 'decim':144 'descript':196 'document':179 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,187 'equal':138 'estim':82 'exact':151 'exampl':199 'exchang':77 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'gas':81 'generat':89 'generic':234 'geocod':86 'geocoding' 'given':140 'header':178 'includ':172 'infrastructur':84 'insight':63 'instant':168 'key':160 'label':238 'land':183 'learn':66 'limit':163 'list':114,185 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':65 'made':147 'marketplac':46 'metric':59 'micropayment api' 'minim':181 'network':104 'page':184,205 'paramet':195 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':145,170,177 'per':3,22,96 'platform':6,25 'premium':116,235 'price':75,93,189 'prompt':212 'protocol':108 'provid':191 'quot':80 'rate':78,162 'report':60 'request':97,124 'request/response':193 'return':120,207,229 'schema':194 'scheme':152 'second':156 'sentiment':67 'sentiment-analysis' 'set':51 'settl':98 'specif':110 'summar':70 'text':69 'text-summarization' 'timeout':157 'token':79 'unit':130 'unknown':231 'usag':198 'usdc':9,28,100,132,141 'usdc api' 'usdc-base' 'util':15,34,85 'utility-apis' 'valid':87 'via':105,148 'wallet':211 'web3':74 'x':176 'x-payment':175 'x402':43,107,150 'x402 api marketplace' 'x402-enabled':42 'x402-payment'","prices":[{"id":"742daa7c-bdc3-475a-b5ca-0256eb17d458","listingId":"492ccd9f-9a77-4a9f-aa91-b4eaaf96f62f","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/messages/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.066Z"}],"sources":[{"listingId":"492ccd9f-9a77-4a9f-aa91-b4eaaf96f62f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/51","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.066Z","lastSeenAt":"2026-04-22T02:32:08.134Z"}],"details":{"listingId":"492ccd9f-9a77-4a9f-aa91-b4eaaf96f62f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/51 \\\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 minimums or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/messages/51 requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/51"},{"claim":"No API keys or rate limits are advertised","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 micropayments"],"bestFor":["Agents or developers who want keyless, pay-per-use API access settled on-chain","Low-volume or bursty workloads where $0.02/request with no minimums is cost-effective","x402-compatible clients that can attach USDC payments on Base"],"notFor":["High-volume production workloads where per-request costs would accumulate quickly without bulk discounts","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.051Z"},"updatedAt":"2026-04-22T02:32:08.134Z"}}