{"id":"81cd87bf-f060-42ec-8038-2eb7812e9829","shortId":"AtMaYb","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach a payment header to each request and receive the response immediately.\n\nThe specific endpoint at `/api/v1/customers/64` is listed as \"Premium API Access\" and returns `application/json`. Based on the x402 challenge, it accepts POST requests and charges a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call, settled to a wallet on Base. The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The actual behavior and data returned by `/api/v1/customers/64` specifically is unclear from available materials — the name \"Premium API Access\" is generic and the endpoint path suggests customer data retrieval, but this cannot be confirmed without further documentation.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-api","no-api-key","post-method"],"categories":["api-platform","data"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content","No OpenAPI schema or request/response examples available","The purpose and expected input/output of /api/v1/customers/64 specifically is unclear — 'Premium API Access' is a generic label","No information on what data the 'customers' endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/64","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/64","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 challenge with clear pricing. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the purpose of the specific /api/v1/customers/64 endpoint is unclear. The listing is effectively a stub with confirmed 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'/request':13,28 '0.02':12,27,59,133,177 '000':128 '20':127 '6':138 'Base network API' 'USDC API' 'accept':119 'access':109,235 'across':45 'actual':218 'advertis':151 'ai/ml':48 'analysi':155 'analyt':47 'api':5,20,37,71,108,186,234 'application/json':112 'attach':87 'avail':229 'base':8,23,67,113,129,147 'behavior':219 'broader':149 'call':4,19,141 'caller':86 'cannot':248 'challeng':117 'charg':123 'classif':158 'commit':78 'confirm':250 'connect':195 'content':201 'convers':170 'crypto-paid API' 'custom':243 'data':46,221,244 'decim':139 'detail':212 'doc':185 'document':180,213,253 'embed':159 'enabl':36 'endpoint':44,55,101,152,216,240 'estim':167 'exampl':209 'exchang':162 'extrem':182 'feed':161 'finance/web3':50 'gas':166 'generat':172 'generic':237 'geocod':168 'handl':83 'header':90 'immedi':98 'infer':49 'infrastructur':52 'inlin':85 'json-api' 'key':72 'limit':75 'list':105 'lowpaymentfee' 'lowpaymentfee.com':31 'materi':230 'maximum':125 'micropayment API' 'name':232 'network':9,24,68 'no-api-key' 'offer':40 'openapi':205 'page':190 'paid':62 'path':241 'pay':2,17 'pay-per-cal':1,16 'pay-per-call' 'pay-per-request' 'payment':84,89 'per':3,18,60,140 'platform':6,21,38,150 'point':179 'post':120 'post-method' 'premium':107,233 'price':57,160,178,187 'prompt':197 'protocol':82 'quot':165 'rate':74,163 'readm':189 'receiv':95 'render':192 'request':61,93,121 'request/response':208 'requir':79 'respons':97 'retriev':245 'return':111,222 'schema':206 'sentiment':154 'settl':142 'sinc':135 'spars':183 'specif':100,225 'substant':200 'suggest':242 'summar':157 'text':156 'token':164 'unclear':227 'unit':130 'usd':134 'usdc':15,30,64,132,136 'usdc-base-network' 'use':137 'util':53 'valid':169 'varieti':42 'via':10,25 'wallet':145,196 'without':251 'x402':11,26,35,81,116 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"3ea9be61-0615-41c4-96ab-558669eb2ed2","listingId":"81cd87bf-f060-42ec-8038-2eb7812e9829","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/64","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:49.872Z"}],"sources":[{"listingId":"81cd87bf-f060-42ec-8038-2eb7812e9829","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/64","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:49.872Z","lastSeenAt":"2026-04-25T00:03:31.310Z"}],"details":{"listingId":"81cd87bf-f060-42ec-8038-2eb7812e9829","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/64 \\\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":"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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network","source_url":"https://lowpaymentfee.com/api/v1/customers/64"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/64"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Integrating x402-compatible endpoints into automated pipelines without subscription management"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Projects needing keyless API access with crypto micropayments"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring non-crypto payment methods","High-volume use cases where per-request pricing may be less economical than subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.653Z"},"updatedAt":"2026-04-25T00:03:31.310Z"}}