{"id":"67e09069-c559-4c25-8641-a465ec0e636d","shortId":"cD7Wuz","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, 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/132` is listed as \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme with a 300-second timeout. No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header to each POST request.\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 detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The purpose of the `/api/v1/messages/132` endpoint specifically is unclear — it may be a messaging or content retrieval endpoint, but no schema or description beyond the generic \"Premium API Access\" title is provided.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","cheap api","no api key","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific endpoint /api/v1/messages/132 has no description beyond 'Premium API Access' — its purpose and expected input/output are unknown","Pages at /api, /pricing, and /README return only a 'Connect wallet' prompt with no useful content","No examples of request or response payloads are available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/132","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/132","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 documentation beyond a landing page listing, and the specific purpose of /api/v1/messages/132 is unexplained. Effectively a stub 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'/api/v1/messages/132':113,225 '/pricing':192 '/readme':194 '/request':19,38 '0.02':18,37,95,140 '000':128 '0x8335':134 '20':127 '2913':135 '300':155 '6':144 'access':119,249 'across':54 'advertis':123,165 'ai':12,31,64 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'analysi':68 'analyt':58 'api':5,24,45,118,159,248 'asset':133 'attach':168 'avail':185 'bare':200 'base':8,27,103,129,137 'base usdc api' 'beyond':244 'broad':50 'call':4,23 'caller':166 'catalog':51 'categori':56 'challeng':122 'cheap api' 'classif':71 'connect':201 'content':236 'convers':88 'conversion' 'crypto-gas-estimates' 'data':11,30,57,61 'data-analytics' 'decim':145 'descript':243 'detail':207 'document':178,216 'embed':72 'enabl':44 'endpoint':16,35,53,91,111,186,226,238 'equal':139 'estim':82 'exact':151 'exampl':220 'exchang':77 'exchange-rates' 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-price-feeds' 'four':55 'gas':81 'generat':89 'generic':246 'geocod':86 'geocoding' 'given':141 'header':173 'infrastructur':84 'insight':63 'key':160 'land':182 'learn':66 'limit':163 'list':115,184 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':65 'made':148 'maxamountrequir':125 'may':231 'messag':234 'metric':59 'micropayment api' 'minim':180 'network':104 'no api key' 'offer':10,29 'openapi':211 'page':183,195 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':146,172 'per':3,22,96 'platform':6,25,46 'post':176 'premium':117,247 'price':75,93,188 'prompt':203 'protocol':108 'provid':252 'purpos':222 'quot':80 'rate':78,162 'report':60 'request':97,177 'request/response':214 'resolv':197 'retriev':237 'schema':215,241 'scheme':152 'second':156 'sentiment':67 'settl':98 'simpli':167 'spec':212 'specif':110,227 'summar':70 'text':69 'timeout':157 'titl':250 'token':79 'unclear':229 'unit':130 'usag':219 'usdc':9,28,100,132,142 'usdc-base' 'util':15,34,85 'valid':87 'validation' 'via':105,149 'wallet':202 'web3':74 'x':171 'x-payment':170 'x402':43,107,121 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"16b15023-8228-4ab9-ad81-a3f6442d136f","listingId":"67e09069-c559-4c25-8641-a465ec0e636d","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/132","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.114Z"}],"sources":[{"listingId":"67e09069-c559-4c25-8641-a465ec0e636d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/132","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.114Z","lastSeenAt":"2026-04-22T02:32:06.347Z"}],"details":{"listingId":"67e09069-c559-4c25-8641-a465ec0e636d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/132 \\\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/132 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with exact scheme and 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/messages/132"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto price feeds and gas estimates with per-call USDC payments","Running geocoding or data validation as a utility service with no subscription commitment","Exporting analytics data or generating reports on demand"],"bestFor":["Agents or bots that need low-friction, keyless API access paid per call","Developers prototyping with multiple API categories (AI, finance, data) from a single provider","Web3-native applications already holding USDC on Base"],"notFor":["Production workloads requiring documented request/response schemas and SLAs","High-volume use cases where subscription pricing would be more cost-effective","Users who need detailed API documentation or SDKs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.542Z"},"updatedAt":"2026-04-22T02:32:06.347Z"}}