{"id":"048d916d-eb3c-4078-b9c0-3d21f72980ca","shortId":"QS7KVZ","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 `/api/v1/accounts/82` is listed as \"Premium API Access\" and returns a live 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made per-request with no API keys, no rate limits, and no upfront commitments. The x402 challenge specifies the \"exact\" payment scheme with a 300-second timeout.\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 from the crawled material. The exact functionality of the `/api/v1/accounts/82` endpoint is unclear beyond its \"Premium API Access\" label. Users should expect to experiment or contact the provider for details on request format and response structure.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","ai","finance","data"],"synonyms":["pay-per-call API","x402 API","USDC API","micropayment API","low fee API","Base network API","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — request/response formats are unknown","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific functionality of /api/v1/accounts/82 ('Premium API Access') is not described anywhere","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/82","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/accounts/82","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 documentation beyond a landing page listing, no request/response schemas, and no examples. The specific purpose of /api/v1/accounts/82 is undocumented. Effectively a stub 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'/api/v1/accounts/82':112,218 '/docs':178 '/pricing':179 '/readme':182 '/request':19,38 '0.02':18,37,95,134 '000':129 '20':128 '300':170 '402':123 '6':139 'Base network API' 'USDC API' 'access':118,226 'across':54 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,117,151,225 'avail':208 'base':8,27,103,130,142 'beyond':222 'broad':50 'call':4,23 'catalog':51 'categori':56 'challeng':124,162 'classif':71 'classification' 'commit':159 'connect':188 'contact':234 'content':194 'convers':88 'crawl':211 'crypto-paid API' 'data':11,30,57,61 'data-analytics' 'decim':140 'detail':238 'document':173,203 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,219 'estim':82 'exact':165,214 'exampl':207 'exchang':77 'expect':230 'experi':232 'export':62 'extrem':175 'feed':76 'financ':13,32,73 'finance-data' 'format':241 'four':55 'function':215 'gas':81 'generat':89 'geocod':86 'geocoding' 'infrastructur':84 'insight':63 'key':152 'label':227 'learn':66 'limit':155 'list':114 'live':122 'low fee API' 'lowpaymentfee.com':39 'machin':65 'made':145 'materi':212 'metric':59 'micropayment API' 'network':104 'no-api-key' 'offer':10,29 'openapi':198 'page':183 'paid':98 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'payment':143,166 'per':3,22,96,147 'per-request':146 'per-request-billing' 'platform':6,25,46 'premium':116,224 'price':75,93 'prompt':190 'protocol':108 'provid':48,236 'quot':80 'rate':78,154 'render':185 'report':60 'request':97,125,148,240 'request/response':201 'respons':243 'return':120 'schema':202 'scheme':167 'second':171 'sentiment':67 'sentiment-analysis' 'sinc':136 'spars':176 'spec':199 'specif':110 'specifi':163 'structur':244 'summar':70 'text':69 'text-summarization' 'timeout':172 'token':79 'unclear':221 'unit':131 'upfront':158 'usag':206 'usd':135 'usdc':9,28,100,133,137 'usdc-base' 'use':138 'user':228 'util':15,34,85 'valid':87 'via':105 'wallet':189 'web3':74 'x402':43,107,161 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"09d7e853-ea8f-4f72-a7bb-d3821b980bc1","listingId":"048d916d-eb3c-4078-b9c0-3d21f72980ca","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/accounts/82","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:11.561Z"}],"sources":[{"listingId":"048d916d-eb3c-4078-b9c0-3d21f72980ca","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/82","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:11.561Z","lastSeenAt":"2026-04-22T18:31:08.632Z"}],"details":{"listingId":"048d916d-eb3c-4078-b9c0-3d21f72980ca","quickStartSnippet":"# Send a POST with x402 payment header to access the endpoint\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/82 \\\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/accounts/82 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/82"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"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, validation, and conversion without rate limits"],"bestFor":["Developers who want instant API access without registration or API keys","Agents and bots that can settle payments in USDC on Base via x402","Low-volume or sporadic usage where per-request pricing is more economical than subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.835Z"},"updatedAt":"2026-04-22T18:31:08.632Z"}}