{"id":"f09fe19f-0645-4737-9b6a-85551fa704b6","shortId":"PEfvzt","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are priced at $0.02 per request, paid in USDC on the Base network. The x402 protocol means there are no API keys, no accounts, and no rate limits — callers simply attach a payment header to each request.\n\nThe specific endpoint at `/api/v1/payments/193` is listed 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. The payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is extremely sparse (docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional content). There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The actual functionality behind this specific endpoint and the broader catalog cannot be verified from the available information.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI specification or request/response schema available","Documentation pages (docs, pricing, API, README) are effectively empty — only show 'Connect wallet'","The actual functionality behind '/api/v1/payments/193' ('Premium API Access') is undocumented and unclear","Cannot verify what data or service is returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/193","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/payments/193","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC payments on Base at $0.02. However, there is no OpenAPI spec, no request/response schema, no documentation, and no examples — the docs/pricing/API/README pages are all blank beyond a wallet-connect prompt. The actual functionality of this specific endpoint is 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'/request':13,32 '0.02':12,31,73,132,191 '000':127 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '20':126 '300':150 '402':121 '6':137 'Base network API' 'USDC micropayment API' 'accept':155 'access':117 'account':93 'actual':239 'addit':218 'address':146 'advertis':164 'ai/ml':61 'analysi':168 'analyt':60 'api':5,17,24,36,45,90,116,205 'application/json':160 'attach':100 'avail':233,254 'base':8,27,81,128,140 'behind':241 'beyond':196 'broad':50 'broader':162,247 'call':4,23 'caller':98 'cannot':249 'catalog':51,248 'challeng':122 'classif':171 'connect':213 'content':219 'convers':183 'crawl':236 'crypto-paid API' 'data':59,64,185 'decim':138 'doc':203 'document':195,228 'embed':172 'enabl':44 'endpoint':57,69,109,154,165,244 'estim':180 'exampl':232 'exchang':175 'extrem':201 'feed':174 'finance/web3':63 'function':240 'gas':179 'generat':186 'geocod':181 'header':103 'howev':194 'infer':62 'inform':255 'json-response' 'key':18,37,91 'land':198 'limit':97 'list':113 'lowpaymentfee' 'lowpaymentfee.com':39 'materi':237 'mean':86 'network':9,28,82 'no-api-key' 'offer':48 'openapi':223 'page':199,208 'paid':76 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':102,142 'per':3,22,55,74 'platform':6,25,46,163 'point':193 'post':156 'post-method' 'premium':115 'premium API access' 'price':71,173,192,204 'prompt':215 'protocol':85 'quot':178 'rate':96,176 'readm':207 'render':210 'request':56,75,106,123,157 'request/response':226 'requir':19,38 'return':119,159 'schema':227 'second':151 'sentiment':167 'servic':67 'settl':144 'simpli':99 'sinc':134 'span':58 'spars':202 'spec':224 'specif':108,243 'summar':170 'text':169 'timeout':152 'token':177 'unit':129 'usag':231 'usd':133 'usdc':15,34,78,131,135 'usdc-base-network' 'use':136 'util':66 'valid':182 'verifi':251 'via':10,29 'wallet':214 'x402':11,30,43,84 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"3148baa8-9f15-4589-a657-08f67a3247f6","listingId":"f09fe19f-0645-4737-9b6a-85551fa704b6","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/payments/193","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:47.289Z"}],"sources":[{"listingId":"f09fe19f-0645-4737-9b6a-85551fa704b6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/193","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:47.289Z","lastSeenAt":"2026-04-24T05:32:16.929Z"}],"details":{"listingId":"f09fe19f-0645-4737-9b6a-85551fa704b6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/193 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/payments/193"},{"claim":"All endpoints are 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 platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation, pricing, API, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API key management","Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers or agents wanting zero-signup, pay-per-use API access","x402-compatible clients on the Base network","Low-volume or sporadic API consumers who prefer no subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.903Z"},"updatedAt":"2026-04-24T05:32:16.929Z"}}