{"id":"dfe3ad5b-c912-4bb7-80fc-128b7c03a073","shortId":"jMvdvt","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/crypto market data, and general-purpose utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an X-PAYMENT header with a valid payment proof to each request.\n\nThe specific endpoint probed here (`/api/v1/admin`) is described as \"Premium API Access\" and carries a max amount of 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals), consistent with the site-wide $0.02 pricing. The platform lists 16 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 (geocoding, validation, conversion, generation).\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. No OpenAPI schema, request/response examples, or detailed parameter documentation were found. The endpoint is live (returns a proper 402 challenge), but without documentation it is difficult to know what request bodies each endpoint expects or what response shapes they return.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","sentiment-analysis","text-summarization","text-classification","embeddings","analytics-metrics","data-export","price-feeds","exchange-rates","gas-estimates","geocoding","validation","conversion"],"categories":["llm","finance","geo","analytics"],"synonyms":["low payment fee API","x402 API","pay-per-request API","micropayment API","USDC API","Base network API","AI inference API","crypto price API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format for any endpoint","The /api/v1/admin endpoint name suggests administrative functionality but its actual purpose is undocumented","Cannot verify that the 16 listed endpoints actually function; only /api/v1/admin was probed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/admin","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/admin","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 with clear pricing. However, documentation is essentially nonexistent — all doc/pricing/readme pages show only 'Connect wallet'. No OpenAPI schema, no request/response examples, and no description of what the /admin endpoint actually does beyond 'Premium API Access'. This is effectively a stub 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'/api/v1/admin':118 '/docs':197 '/pricing':198 '/readme':201 '/request':18,36 '0.02':17,35,70,138,150 '000':132 '16':155 '20':131 '402':232 '6':142 'AI inference API' 'Base network API' 'USDC API' 'access':124 'across':157 'ai':12,30,167 'ai/ml':55 'amount':129 'analysi':171 'analyt':11,29,54,161 'analytics-metrics' 'api':5,23,43,88,123 'attach':99 'base':8,26,78,133 'bodi':244 'broad':48 'call':4,22 'caller':97 'carri':126 'categori':159 'challeng':233 'classif':174 'collect':49 'commit':96 'connect':207 'consist':144 'content':213 'convers':190 'conversion' 'cover':10,28 'crypto price API' 'data':53,59,160,164 'data-export' 'decim':143 'describ':120 'detail':220 'difficult':239 'document':192,222,236 'embed':175 'embeddings' 'enabl':42 'endpoint':51,66,115,156,226,246 'estim':185 'everi':65 'exampl':218 'exchang':180 'exchange-rates' 'expect':247 'export':165 'extrem':194 'feed':179 'financ':13,31,176 'finance/crypto':57 'found':224 'four':158 'gas':184 'gas-estimates' 'general':62 'general-purpos':61 'generat':191 'geocod':188 'geocoding' 'given':139 'header':104 'i.e':137 'infer':56 'infrastructur':187 'insight':166 'key':89 'know':241 'learn':169 'limit':92 'list':154 'live':228 'low payment fee API' 'lowpaymentfee.com':37 'machin':168 'market':58 'max':128 'metric':162 'micropayment API' 'network':79 'offer':46 'openapi':215 'page':202 'paramet':221 'pay':2,20 'pay-per-cal':1,19 'pay-per-call' 'pay-per-request API' 'payment':83,103,108 'per':3,21,71 'platform':44,153 'premium':122 'price':68,151,178 'price-feeds' 'probe':116 'prompt':209 'proof':109 'proper':231 'protocol':84 'purpos':63 'quot':183 'rate':91,181 'render':204 'report':163 'request':72,112,243 'request/response':217 'respons':250 'return':229,253 'schema':216 'sentiment':170 'sentiment-analysis' 'settl':73 'shape':251 'simpli':98 'site':148 'site-wid':147 'span':52 'spars':195 'specif':114 'suit':6,24 'summar':173 'text':172 'text-classification' 'text-summarization' 'token':182 'unit':134 'upfront':95 'usdc':9,27,75,136,140 'usdc-base' 'util':15,33,64 'valid':107,189 'validation' 'via':80 'wallet':208 'web3':177 'wide':149 'without':235 'x':102 'x-payment':101 'x402':41,82 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"c4af3569-5912-4513-a976-11e2a2c0e73c","listingId":"dfe3ad5b-c912-4bb7-80fc-128b7c03a073","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/admin","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:54.169Z"}],"sources":[{"listingId":"dfe3ad5b-c912-4bb7-80fc-128b7c03a073","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/admin","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:54.169Z","lastSeenAt":"2026-04-22T19:30:48.792Z"}],"details":{"listingId":"dfe3ad5b-c912-4bb7-80fc-128b7c03a073","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/admin \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/admin"},{"claim":"The site lists 16 endpoints across four categories all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/admin"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Running sentiment analysis or text summarization without managing API keys or subscriptions","Fetching real-time crypto token quotes and gas estimates via micropayment","Geocoding addresses or validating data on a per-call payment basis","Exporting analytics data or generating reports with no rate limits","Generating text embeddings for search or classification tasks"],"bestFor":["Agents or bots that need low-friction, keyless API access via x402","Developers who want pay-as-you-go pricing with no minimum spend","Crypto-native applications already operating on the Base network"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads where $0.02/request adds up significantly","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.602Z"},"updatedAt":"2026-04-22T19:30:48.792Z"}}