{"id":"64cca989-ee54-4c21-865c-3bbb0b36b724","shortId":"ncUdYu","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, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/messages/45` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 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 no API keys or rate limits required — callers simply attach an X-PAYMENT header to each request.\n\nDocumentation beyond the landing page is sparse: the /api, /pricing, and /README routes all return only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The purpose of the `/api/v1/messages/45` endpoint specifically is unclear — it may be a messaging or content retrieval endpoint, but this is not confirmed by any available documentation.","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":["No OpenAPI or schema documentation available for any endpoint","The specific purpose of /api/v1/messages/45 ('Premium API Access') is not explained anywhere in the crawled material","All documentation pages (/api, /pricing, /README) return only 'Connect wallet' with no technical content","Request and response formats are entirely unknown — no examples or schemas found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/45","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/45","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 usage examples, and the specific purpose of /api/v1/messages/45 is undocumented. Most site pages return only a wallet-connect prompt with no substantive 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'/api/v1/messages/45':117,227 '/pricing':189 '/readme':191 '/request':19,38 '0.02':18,37,99,147 '000':136 '0x8335':141 '20':135 '2913':142 '402 payment api' '6':151 'accept':125 'access':123 'across':58 'addit':202 'advertis':131 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,122,163 'attach':171 'avail':218,248 'base':8,27,107,137,144 'base network api' 'beyond':181 'broad':50 'call':4,23 'caller':169 'catalog':51 'categori':60 'challeng':130 'classif':75 'classification' 'confirm':245 'connect':197 'content':238 'convers':92 'crawl':221 'data':11,30,61,65 'data-analytics' 'decim':152 'detail':204 'document':180,213,249 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,115,228,240 'equal':146 'estim':86 'exact':159 'exampl':217 'exchang':81 'export':66 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'gas':85 'generat':93 'geocod':90 'geocoding' 'given':148 'header':176 'infrastructur':88 'insight':67 'key':164 'land':183 'learn':70 'limit':167 'list':119 'low payment fee' 'lowpaymentfee.com':39 'machin':69 'made':155 'materi':222 'maxamountrequir':133 'may':233 'messag':236 'metric':63 'micropayment api' 'network':108 'offer':10,29 'openapi':208 'page':184 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':153,175 'per':3,22,55,100 'platform':6,25,46 'post':126 'premium':121 'price':79,97 'prompt':199 'protocol':112 'provid':48 'purpos':224 'quot':84 'rate':82,166 'report':64 'request':56,101,127,179 'request/response':211 'requir':168 'retriev':239 'return':194 'rout':192 'schema':212 'scheme':160 'sentiment':71 'sentiment-analysis' 'settl':102 'simpli':170 'spars':186 'spec':209 'specif':114,229 'summar':74 'technic':203 'text':73 'text-summarization' 'token':83 'unclear':231 'unit':138 'usag':216 'usdc':9,28,104,140,149 'usdc api' 'usdc-base' 'util':15,34,89 'utility-apis' 'valid':91 'via':109,156 'wallet':198 'web3':78 'x':174 'x-payment':173 'x402':43,111,129,158 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"3eb16960-3b52-4a42-8838-a4896e8c3c6c","listingId":"64cca989-ee54-4c21-865c-3bbb0b36b724","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/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.979Z"}],"sources":[{"listingId":"64cca989-ee54-4c21-865c-3bbb0b36b724","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/45","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.979Z","lastSeenAt":"2026-04-22T02:32:08.043Z"}],"details":{"listingId":"64cca989-ee54-4c21-865c-3bbb0b36b724","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/45 \\\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 platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $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/45 shows maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/45"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Retrieving real-time financial data such as token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, validation, and data conversion on a per-call basis","Integrating pay-per-use data analytics and reporting into agent workflows"],"bestFor":["Agents needing low-friction, keyless API access with crypto micropayments","Developers who want pay-as-you-go pricing with no subscriptions or commitments","Applications on the Base network that can settle USDC payments natively"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Anyone unable to transact in USDC on the Base L2 network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.174Z"},"updatedAt":"2026-04-22T02:32:08.043Z"}}