{"id":"ced1ccf0-5e4c-4405-8c51-95d7c7124f3a","shortId":"dx4vDG","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 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 via the x402 protocol.\n\nThe specific endpoint at `/api/v1/customers/38` is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02). Payment is made per-call via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render 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/customers/38` endpoint specifically is unclear; it may be a demo or customer-record lookup, but this cannot be confirmed from the available material.","tags":[],"capabilities":["x402-payment","per-call-pricing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","validation","no-api-key"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","402 payment api"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or request/response schema provided for any endpoint","The purpose of /api/v1/customers/38 ('Premium API Access') is ambiguous — it may be a demo endpoint","Cannot verify what data or functionality any of the listed endpoints actually return"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/38","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/customers/38","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 pages show only 'Connect wallet'), there is no OpenAPI spec, no request/response schema, and the specific purpose of /api/v1/customers/38 is unclear. This is effectively a stub 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'/api/v1/customers/38':113,211 '/docs':176 '/pricing':177 '/readme':180 '/request':19,38 '0.02':18,37,95,139 '000':128 '0x8335':133 '20':127 '2913':134 '402':122 '402 payment api' '6':137 'accept':165 'access':118 'across':54 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,117,153 'application/json':170 'avail':206,233 'base':8,27,103,129,136 'base network api' 'broad':50 'call':4,23,145 'cannot':228 'catalog':51 'categori':56 'challeng':123 'classif':71 'classification' 'commit':161 'confirm':230 'connect':186 'content':192 'convers':88 'custom':223 'customer-record':222 'data':11,30,57,61 'data-analytics' 'decim':138 'demo':220 'document':171,201 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,164,212 'estim':82 'exact':149 'exampl':205 'exchang':77 'export':62 'extrem':173 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'gas':81 'generat':89 'geocod':86 'geocoding' 'infrastructur':84 'insight':63 'key':154 'label':115 'learn':66 'limit':157 'lookup':225 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':142 'materi':234 'may':217 'metric':59 'micropayment api' 'network':104 'no-api-key' 'offer':10,29 'openapi':196 'page':181 'paid':98 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'payment':140 'per':3,22,96,144 'per-cal':143 'per-call-pricing' 'platform':6,25,46 'post':166 'premium':116 'price':75,93 'prompt':188 'protocol':108 'provid':48 'purpos':208 'quot':80 'rate':78,156 'record':224 'render':183 'report':60 'request':97,124,167 'request/response':199 'requir':162 'return':120,169 'schema':200 'scheme':150 'sentiment':67 'sentiment-analysis' 'spars':174 'spec':197 'specif':110,213 'summar':70 'text':69 'text-summarization' 'token':79 'unclear':215 'unit':130 'upfront':160 'usag':204 'usdc':9,28,100,132 'usdc api' 'usdc-base' 'util':15,34,85 'valid':87 'validation' 'via':105,146 'wallet':187 'web3':74 'x402':43,107,148 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"659d041d-de84-4fb4-ab27-8ba149a8f891","listingId":"ced1ccf0-5e4c-4405-8c51-95d7c7124f3a","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/customers/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:54.967Z"}],"sources":[{"listingId":"ced1ccf0-5e4c-4405-8c51-95d7c7124f3a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/38","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:54.967Z","lastSeenAt":"2026-04-22T23:00:56.332Z"}],"details":{"listingId":"ced1ccf0-5e4c-4405-8c51-95d7c7124f3a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/38 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/38"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/customers/38"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with instant pay-per-use billing","Using utility services like geocoding and validation without rate limits or subscriptions"],"bestFor":["Agents or developers who want instant, keyless API access paid per request","Low-volume or bursty workloads where subscription pricing is wasteful","Crypto-native applications already operating on the Base network with USDC"],"notFor":["High-volume production workloads needing SLAs, guaranteed uptime, or detailed documentation","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.344Z"},"updatedAt":"2026-04-22T23:00:56.332Z"}}