{"id":"5fb721c4-56c6-46aa-9aaf-8e38df7303de","shortId":"M8Ftt4","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request 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.\n\nThe specific endpoint at `/api/v1/charges/248` is labeled \"Premium API Access\" and returns a valid x402 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 platform advertises instant access with no minimums or commitments.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, 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 behind the \"Premium API Access\" label at `/api/v1/charges/248` is unclear; it may be a generic charge endpoint or a gateway to one of the listed services. Without documentation, the actual input parameters and response format cannot be confirmed.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 API","pay per call API","USDC API","Base network API","micropayment API","cheap API access"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all return only a 'Connect wallet' prompt with no actual content","No OpenAPI or schema documentation available for any endpoint","The specific functionality of /api/v1/charges/248 ('Premium API Access') is unclear — it may be a generic charge endpoint rather than a specific service","No request or response examples are available; input parameters are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/248","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/charges/248","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 it accepts USDC payments on Base. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response examples, and the specific purpose of the /charges/248 endpoint is ambiguous. The listing is effectively a stub with pricing confirmed but functionality 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'/api/v1/charges/248':113,219 '/docs':174 '/pricing':176 '/readme':178 '/request':19,38 '0.02':18,37,99,134 '000':129 '20':128 '6':139 'Base network API' 'USDC API' 'access':118,163,216 'across':58 'actual':241 'advertis':161 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,117,153,215 'avail':204 'base':8,27,107,130,142 'behind':212 'broad':50 'call':4,23 'cannot':247 'catalog':51 'categori':60 'challeng':124 'charg':227 'cheap API access' 'classif':75 'classification' 'commit':168 'confirm':249 'connect':184 'content':190 'convers':92 'crawl':207 'data':11,30,61,65 'data-analytics' 'decim':140 'document':169,199,239 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,111,228 'estim':86 'exact':149,210 'exampl':203 'exchang':81 'export':66 'extrem':171 'feed':80 'financ':13,32,77 'finance-data' 'format':246 'four':59 'function':211 'gas':85 'gateway':231 'generat':93 'generic':226 'geocod':90 'geocoding' 'infrastructur':88 'input':242 'insight':67 'instant':162 'key':154 'label':115,217 'learn':70 'limit':157 'list':236 'low payment fee' 'lowpaymentfee.com':39 'machin':69 'made':145 'materi':208 'may':223 'metric':63 'micropayment API' 'minimum':166 'network':108 'offer':48 'one':233 'openapi':194 'page':179 'paid':102 'paramet':243 'pay':2,21,54 'pay per call API' 'pay-per-cal':1,20 'pay-per-request':53 'payment':143 'per':3,22,55,100 'platform':6,25,46,160 'premium':116,214 'price':79,97 'prompt':186 'quot':84 'rate':82,156 'render':181 'report':64 'request':56,101,125 'request/response':197 'requir':158 'respons':245 'return':120 'schema':198 'scheme':150 'sentiment':71 'sentiment-analysis' 'servic':237 'sinc':136 'spars':172 'spec':195 'specif':110 'summar':74 'text':73 'text-summarization' 'token':83 'unclear':221 'unit':131 'usag':202 'usd':135 'usdc':104,133,137 'usdc-base' 'use':138 'util':15,34,89 'utility-apis' 'valid':91,122 'via':9,28,146 'wallet':185 'web3':78 'without':238 'x402':10,29,43,123,148 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"b6503b1b-1c41-4b15-a433-c078ad08dfe1","listingId":"5fb721c4-56c6-46aa-9aaf-8e38df7303de","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/charges/248","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:49.643Z"}],"sources":[{"listingId":"5fb721c4-56c6-46aa-9aaf-8e38df7303de","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/248","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:49.643Z","lastSeenAt":"2026-04-23T09:31:00.777Z"}],"details":{"listingId":"5fb721c4-56c6-46aa-9aaf-8e38df7303de","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/248 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/248"},{"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 management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with per-request billing","Using utility services like geocoding, validation, and conversion via micropayments"],"bestFor":["Agents or developers who want keyless, pay-per-use API access","Use cases requiring low-friction micropayments in USDC on Base","Prototyping or low-volume usage where subscription plans are overkill"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users who cannot transact in USDC on the Base network","Applications requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.343Z"},"updatedAt":"2026-04-23T09:31:00.777Z"}}