{"id":"b989f56a-0d43-43fe-a2fb-2a8dfac2026b","shortId":"eR6tkf","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/79` 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.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (402 challenge captured), but the actual behavior and data returned by `/api/v1/customers/79` specifically is unclear from available materials.","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 API","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) contain no substantive content — only a 'Connect wallet' prompt.","No OpenAPI or schema documentation available; request and response formats are unknown.","The specific purpose and data returned by /api/v1/customers/79 is not documented anywhere in the crawl.","The platform lists many endpoint categories (AI, finance, analytics, etc.) but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/79","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/79","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC per call). However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The specific purpose of /api/v1/customers/79 is unclear beyond the generic 'Premium API Access' 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'/api/v1/customers/79':103,228 '/docs':178 '/pricing':179 '/readme':182 '/request':13,28 '0.02':12,27,59,133 '000':128 '20':127 '402':217 '6':138 'Base network API' 'USDC API' 'accept':119 'access':109 'across':45 'actual':222 'advertis':151 'ai/ml':48 'analysi':155 'analyt':47 'api':5,20,37,71,108 'application/json':112 'attach':87 'avail':208,233 'base':8,23,67,113,129,147 'behavior':223 'broader':149 'call':4,19,141 'caller':86 'captur':219 'challeng':117,218 'charg':123 'classif':158 'commit':78 'confirm':215 'connect':188 'content':194 'convers':170 'crawl':211 'data':46,225 'decim':139 'document':173,203 'embed':159 'enabl':36 'endpoint':44,55,101,152,213 'estim':167 'exampl':207 'exchang':162 'extrem':175 'feed':161 'finance/web3':50 'gas':166 'generat':172 'geocod':168 'handl':83 'header':90 'immedi':98 'infer':49 'infrastructur':52 'inlin':85 'json-api' 'key':72 'limit':75 'list':105 'live':216 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'materi':234 'maximum':125 'micropayment API' 'network':9,24,68 'no-api-key' 'offer':40 'openapi':198 'page':183 'paid':62 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':84,89 'per':3,18,60,140 'platform':6,21,38,150 'post':120 'post-method' 'premium':107 'price':57,160 'prompt':190 'protocol':82 'quot':165 'rate':74,163 'receiv':95 'render':185 'request':61,93,121 'request/response':201 'requir':79 'respons':97 'return':111,226 'schema':202 'sentiment':154 'settl':142 'sinc':135 'spars':176 'spec':199 'specif':100,229 'substant':193 'summar':157 'text':156 'token':164 'unclear':231 'unit':130 'usag':206 'usd':134 'usdc':15,30,64,132,136 'usdc-base-network' 'use':137 'util':53 'valid':169 'varieti':42 'via':10,25 'wallet':145,189 'x402':11,26,35,81,116 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"c32c0e25-0d93-4af9-a565-325a39920d94","listingId":"b989f56a-0d43-43fe-a2fb-2a8dfac2026b","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/79","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:19.544Z"}],"sources":[{"listingId":"b989f56a-0d43-43fe-a2fb-2a8dfac2026b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/79","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:19.544Z","lastSeenAt":"2026-04-23T20:01:21.413Z"}],"details":{"listingId":"b989f56a-0d43-43fe-a2fb-2a8dfac2026b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/79 \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/79"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data endpoints without API key registration","Making one-off API calls with per-request USDC micropayments","Agent-driven workflows that need instant, keyless API access on Base"],"bestFor":["Developers who want zero-signup API access via crypto micropayments","AI agents that can settle x402 payments autonomously","Users already on the Base network with USDC"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring fiat-only payment rails","High-volume use cases where per-request payment overhead is impractical"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T10:03:33.997Z"},"updatedAt":"2026-04-23T20:01:21.413Z"}}