{"id":"f02d896d-9b42-4ec8-8b5b-82912e661d59","shortId":"TFLqtx","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 at `/api/v1/messages/143` is listed as \"Premium API Access.\" Its x402 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 per-request with no API keys, no rate limits, and no commitments required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nNote that while the landing page lists many endpoints across multiple categories, the actual functionality behind `/api/v1/messages/143` is not well-documented. There is no OpenAPI schema, no request/response examples, and the crawled sub-pages (api, pricing, README) all returned only a \"Connect wallet\" prompt with no additional documentation. The endpoint is live (returns a proper 402 challenge), but what \"messages/143\" specifically returns is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific functionality of /api/v1/messages/143 ('Premium API Access') is undocumented — it is unclear what 'messages/143' returns","Sub-pages (/api, /pricing, /README) all returned only 'Connect wallet' with no documentation","No request or response examples are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/143","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/143","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, but there is no OpenAPI schema, no request/response examples, and no documentation beyond the landing page listing. The purpose of '/api/v1/messages/143' specifically is unclear. Sub-pages returned only 'Connect wallet' with no useful 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'/request':19,38 '0.02':18,37,95,138 '000':128 '0x8335':133 '20':127 '402':232 '6':142 'access':119 'across':54,184 'actual':188 'addit':223 'advertis':123 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,118,152,211 'attach':163 'avail':242 'base':8,27,103,129,135 'base network api' 'behind':190 'broad':50 'call':4,23 'caller':161 'categori':56,186 'challeng':122,233 'classif':71 'classification' 'commit':159 'connect':218 'convers':88 'crawl':207 'data':11,30,57,61 'data-analytics' 'decim':143 'document':196,224 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,183,226 'equal':137 'estim':82 'exampl':204 'exchang':77 'export':62 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':189 'gas':81 'generat':89 'geocod':86 'geocoding' 'given':139 'header':168 'infrastructur':84 'insight':63 'key':153 'land':179 'learn':66 'limit':156 'list':115,181 'live':228 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':65 'made':146 'mani':182 'materi':243 'maxamountrequir':125 'messages/143':236 'metric':59 'micropayment api' 'multipl':185 'network':104 'no-api-key' 'note':175 'offer':10,29 'openapi':200 'page':180,210 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payabl':98 'payment':144,167,173 'per':3,22,96,148 'per-request':147 'platform':6,25,46 'premium':117 'price':75,93,212 'prompt':220 'proof':174 'proper':231 'protocol':108 'provid':48 'quot':80 'rate':78,155 'readm':213 'report':60 'request':97,149 'request/response':203 'requir':160 'return':215,229,238 'schema':201 'sentiment':67 'sentiment-analysis' 'simpli':162 'specif':110,237 'sub':209 'sub-pag':208 'suit':51 'summar':70 'text':69 'text-summarization' 'token':79 'unclear':240 'unit':130 'usdc':9,28,100,132,140 'usdc api' 'usdc-base-network' 'util':15,34,85 'utility-services' 'valid':87,171 'via':105 'wallet':219 'web3':74 'well':195 'well-docu':194 'x':166 'x-payment':165 'x402':43,107,121,172 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"dbc37928-6e95-43a6-839f-7ad14a5ddd58","listingId":"f02d896d-9b42-4ec8-8b5b-82912e661d59","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/143","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.198Z"}],"sources":[{"listingId":"f02d896d-9b42-4ec8-8b5b-82912e661d59","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/143","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.198Z","lastSeenAt":"2026-04-22T02:32:06.468Z"}],"details":{"listingId":"f02d896d-9b42-4ec8-8b5b-82912e661d59","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/143 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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/messages/143 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/143"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without subscription","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations like geocoding, validation, and data conversion with micropayments","Integrating pay-per-use data analytics into agent workflows"],"bestFor":["AI agents needing on-demand API access without API key management","Developers wanting low-cost, no-commitment access to diverse utility endpoints","Web3-native applications that can pay in USDC on Base"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.416Z"},"updatedAt":"2026-04-22T02:32:06.468Z"}}