{"id":"f746873a-283e-460e-b2a2-34eb401099ef","shortId":"pV4HKM","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 exposes a broad catalog of endpoints across four categories: Data & Analytics (metrics, reports, 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/156` 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 via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts HTTP POST requests and returns application/json.\n\nNote that the crawled documentation is extremely thin — the `/api`, `/pricing`, and `/README` pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The purpose of the `/api/v1/messages/156` path specifically is unclear from the available material; it does not appear in the homepage catalog, which lists different endpoint paths. The endpoint is live (returns a valid 402 challenge), but what it actually returns upon successful payment is unknown.","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","cheap api","no-auth api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /api/v1/messages/156 path does not appear in the homepage's published API catalog — its specific function is unknown","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no useful content","No request body schema or response schema is documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/156","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/156","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 spec, no request/response schema, no examples, and no documentation beyond a homepage listing. The specific /api/v1/messages/156 path is not even listed on the homepage catalog, making its purpose unclear. Effectively a stub 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'/api/v1/messages/156':112,215 '/pricing':182 '/readme':184 '/request':19,38 '0.02':18,37,94,137 '000':127 '0x8335':132 '20':126 '402':244 '6':141 'accept':165 'access':118 'across':54 'actual':249 'advertis':122 'ai':12,31,63 'ai-inference' 'analysi':67 'analyt':58 'api':5,24,45,117,153 'appear':227 'application/json':171 'avail':210,222 'base':8,27,102,128,134 'base network api' 'broad':50 'call':4,23 'catalog':51,231 'categori':56 'challeng':121,245 'cheap api' 'classif':70 'classification' 'commit':161 'connect':190 'content':196 'convers':87 'crawl':175 'data':11,30,57 'data-analytics' 'decim':142 'differ':234 'document':176,205 'embed':71 'embeddings' 'enabl':44 'endpoint':16,35,53,90,110,164,235,238 'equal':136 'estim':81 'exact':149 'exampl':209 'exchang':76 'export':61 'expos':48 'extrem':178 'feed':75 'financ':13,32,72 'finance-data' 'four':55 'gas':80 'generat':88 'geocod':85 'geocoding' 'given':138 'homepag':230 'http':166 'infrastructur':83 'insight':62 'key':154 'learn':65 'limit':157 'list':114,233 'live':240 'low payment fee' 'lowpaymentfee.com':39 'machin':64 'made':145 'materi':223 'maxamountrequir':124 'metric':59 'micropayment api' 'network':103 'no-auth api' 'note':172 'offer':10,29 'openapi':200 'page':185 'path':216,236 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':143,253 'per':3,22,95 'platform':6,25,46 'post':167 'premium':116 'price':74,92 'prompt':192 'protocol':107 'purpos':212 'quot':79 'rate':77,156 'report':60 'request':96,168 'request/response':203 'requir':162 'return':170,187,241,250 'schema':204 'scheme':150 'sentiment':66 'sentiment-analysis' 'settl':97 'spec':201 'specif':109,217 'success':252 'summar':69 'text':68 'text-summarization' 'thin':179 'token':78 'unclear':219 'unit':129 'unknown':255 'upfront':160 'upon':251 'usag':208 'usdc':9,28,99,131,139 'usdc api' 'usdc-base' 'util':15,34,84 'utility-apis' 'valid':86,243 'via':104,146 'wallet':191 'web3':73 'x402':43,106,120,148 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e39a8b90-ca69-4475-903f-1037b90c342a","listingId":"f746873a-283e-460e-b2a2-34eb401099ef","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/156","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.383Z"}],"sources":[{"listingId":"f746873a-283e-460e-b2a2-34eb401099ef","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/156","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.383Z","lastSeenAt":"2026-04-22T05:32:16.312Z"}],"details":{"listingId":"f746873a-283e-460e-b2a2-34eb401099ef","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/156 \\\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":"The x402 challenge for /api/v1/messages/156 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/156"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, exchange rates, and gas estimates on a per-call basis","Running data analytics queries and exporting insights with micropayments","Using utility services like geocoding, validation, and format conversion via pay-per-request"],"bestFor":["Agents or bots that need instant, keyless API access with crypto micropayments","Developers prototyping with low-cost, no-commitment API calls","Web3-native applications that can settle payments 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","Applications requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.121Z"},"updatedAt":"2026-04-22T05:32:16.312Z"}}