{"id":"61485d4c-461e-48c5-8328-de944945643c","shortId":"Yr6bGn","kind":"x402","title":"Pay-per-call API platform on Base offering AI, analytics, finance, and utility endpoints at $0.02 each via x402.","tagline":"Pay-per-call API platform on Base offering AI, analytics, finance, and utility endpoints at $0.02 each via x402.","description":"lowpaymentfee.com is an x402-enabled API platform 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, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at `/api/v2/config` is listed as \"Premium API Access\" and returns an x402 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. The endpoint accepts POST requests and returns application/json.\n\nDocumentation beyond the landing page is sparse — the /docs, /pricing, /api, and /README pages all render 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 content. The actual behavior and response format of the `/api/v2/config` endpoint (and the other listed endpoints) cannot be confirmed from the available material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","sentiment-analysis","text-summarization","text-classification","embeddings","analytics","data-export","price-feeds","exchange-rates","gas-estimates","geocoding","validation","conversion"],"categories":["llm","finance","geo","data"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api","ai inference api","sentiment api","embeddings api"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior is unverifiable","All doc/pricing/README pages render only 'Connect wallet' with no technical content","The specific purpose of /api/v2/config ('Premium API Access') is unclear — it may be a configuration or meta endpoint rather than a data endpoint","No request body schema or response examples are documented anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v2/config","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/v2/config","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, and all documentation pages return only a wallet-connect prompt. The actual functionality behind the endpoints cannot be verified from available material, making this effectively a stub 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'/api/v2/config':122,228 '/docs':184 '/pricing':185 '/readme':188 '0.02':17,37,97,149 '000':138 '0x8335':143 '20':137 '2913':144 '300':165 '6':153 'accept':170 'access':128 'across':56 'actual':221 'addit':199 'ai':10,30,66 'ai inference api' 'analysi':70 'analyt':11,31,60 'analytics' 'api':5,25,47,109,127 'application/json':175 'avail':215,240 'base':8,28,105,139,146 'base network api' 'behavior':222 'beyond':177 'broad':52 'call':4,24 'cannot':235 'categori':58 'challeng':133 'classif':73 'commit':116 'confirm':237 'connect':194 'content':219 'convers':90 'conversion' 'crawl':218 'data':59,63 'data-export' 'decim':154 'detail':201 'document':176,210 'embed':74 'embeddings' 'embeddings api' 'enabl':46 'endpoint':15,35,55,93,120,169,229,234 'equal':148 'estim':84 'exact':161 'exampl':214 'exchang':79 'exchange-rates' 'export':64 'expos':50 'feed':78 'financ':12,32,75 'format':225 'four':57 'gas':83 'gas-estimates' 'generat':91 'geocod':88 'geocoding' 'given':150 'infrastructur':86 'insight':65 'key':110 'land':179 'learn':68 'limit':113 'list':124,233 'low payment fee' 'lowpaymentfee.com':41 'machin':67 'made':157 'materi':241 'metric':61 'micropayment api' 'network':106 'offer':9,29 'openapi':205 'page':180,189 'paid':100 'pay':2,22 'pay per call api' 'pay-per-cal':1,21 'pay-per-request' 'payment':155 'per':3,23,98 'platform':6,26,48 'post':171 'premium':126 'price':77,95 'price-feeds' 'prompt':196 'quot':82 'rate':80,112 'render':191 'report':62 'request':99,134,172 'request/response':208 'requir':117 'respons':224 'return':130,174 'schema':209 'scheme':162 'second':166 'sentiment':69 'sentiment api' 'sentiment-analysis' 'set':53 'spars':182 'spec':206 'specif':119 'summar':72 'technic':200 'text':71 'text-classification' 'text-summarization' 'timeout':167 'token':81 'unit':140 'usag':213 'usdc':102,142,151 'usdc api' 'usdc-base' 'util':14,34,87 'valid':89 'validation' 'via':19,39,158 'wallet':195 'web3':76 'x402':20,40,45,132,160 'x402 api' 'x402-enabled':44 'x402-payment'","prices":[{"id":"c015c957-829d-4cf5-97c4-23c3b4d47316","listingId":"61485d4c-461e-48c5-8328-de944945643c","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/v2/config","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:39.686Z"}],"sources":[{"listingId":"61485d4c-461e-48c5-8328-de944945643c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v2/config","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:39.686Z","lastSeenAt":"2026-04-23T16:06:41.238Z"}],"details":{"listingId":"61485d4c-461e-48c5-8328-de944945643c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v2/config \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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/v2/config requires up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v2/config"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"AI endpoints include sentiment analysis, text summarization, classification, and embeddings","source_url":"https://lowpaymentfee.com"}],"useCases":["Running sentiment analysis or text classification on demand without managing API keys","Fetching real-time crypto price feeds or gas estimates with per-call USDC payments","Geocoding addresses or converting data formats via lightweight utility endpoints","Generating text embeddings for search or recommendation pipelines","Exporting analytics data or generating reports on a pay-as-you-go basis"],"bestFor":["Agents or apps that need low-friction, keyless API access paid in crypto","Developers wanting to test multiple AI/data/finance endpoints at a flat $0.02 per call","Web3-native workflows that already hold USDC on Base"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads that require SLAs, rate-limit guarantees, or bulk pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.336Z"},"updatedAt":"2026-04-23T16:06:41.238Z"}}