{"id":"763fd633-4f04-4d5b-8c73-2498dc61f511","shortId":"K58F4z","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, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/customers/89` is described as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the x402 `exact` scheme with no API keys or rate limits required. The endpoint accepts POST requests and returns `application/json` responses. The payment timeout is 300 seconds.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The actual functionality behind `/api/v1/customers/89` is unclear from the available material; the name \"Premium API Access\" and the path suggest a customer data resource, but this cannot be confirmed.","tags":[],"capabilities":["x402-payment","usdc-base-settlement","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","json-api"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific endpoint /api/v1/customers/89 has an unclear purpose; 'Premium API Access' is a generic label","No request or response examples available to confirm actual functionality","Cannot verify that the advertised AI, finance, and data endpoints actually return meaningful data"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/89","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/89","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, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose of the specific /api/v1/customers/89 endpoint is unclear. This is effectively a stub 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'/request':19,38 '0.02':18,37,95,134 '000':129 '20':128 '300':172 '402':123 '6':139 'accept':161 'access':119,226 'across':54 'actual':212 'addit':194 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,118,153,181,225 'application/json':166 'avail':220 'base':8,27,103,130,142 'base usdc api' 'behind':214 'broad':50 'call':4,23 'cannot':237 'catalog':51 'categori':56 'challeng':124 'classif':71 'classification' 'confirm':239 'connect':189 'content':195 'convers':88 'custom':232 'data':11,30,57,61,233 'data-analytics' 'decim':140 'describ':115 'detail':206 'doc':179 'document':174,207 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,160,210 'estim':82 'exact':149 'exampl':203 'exchang':77 'export':62 'extrem':176 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':213 'gas':81 'generat':89 'geocod':86 'geocoding' 'infrastructur':84 'insight':63 'json-api' 'key':154 'learn':66 'limit':157 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':65 'made':145 'materi':221 'metric':59 'micropayment api' 'name':223 'network':104 'offer':10,29 'openapi':199 'page':184 'path':229 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':143,169 'per':3,22,96 'platform':6,25,46 'post':162 'premium':117,224 'price':75,93,180 'prompt':191 'protocol':108 'provid':48 'quot':80 'rate':78,156 'readm':183 'render':186 'report':60 'request':97,125,163 'request/response':202 'requir':158 'resourc':234 'respons':167 'return':121,165 'schema':200 'scheme':150 'second':173 'sentiment':67 'sentiment-analysis' 'settl':98 'sinc':136 'spars':177 'specif':110 'suggest':230 'summar':70 'text':69 'text-summarization' 'timeout':170 'token':79 'unclear':217 'unit':131 'usd':135 'usdc':9,28,100,133,137 'usdc-base-settlement' 'use':138 'util':15,34,85 'valid':87 'via':105,146 'wallet':190 'web3':74 'x402':43,107,148 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"41a04a46-b571-4eb6-9eee-60019613678b","listingId":"763fd633-4f04-4d5b-8c73-2498dc61f511","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/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:21.920Z"}],"sources":[{"listingId":"763fd633-4f04-4d5b-8c73-2498dc61f511","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/89","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:21.920Z","lastSeenAt":"2026-04-22T19:30:50.896Z"}],"details":{"listingId":"763fd633-4f04-4d5b-8c73-2498dc61f511","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/89 \\\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 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/customers/89 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/89"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/customers/89"}],"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","Running data analytics queries and exporting reports on a per-request payment basis","Using utility services like geocoding, validation, and data conversion with instant crypto-settled access"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access settled in USDC on Base","AI agents that can autonomously pay for API calls via x402 protocol","Projects needing quick access to diverse utility endpoints without signup or rate limits"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring high-throughput bulk access where per-request pricing is inefficient","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.136Z"},"updatedAt":"2026-04-22T19:30:50.896Z"}}