{"id":"26aad1c8-eec5-4822-a1dd-6adaa012a770","shortId":"HRB7Hu","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 data, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable 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/83` 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 on the Base L2 network to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The broader platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and more — all at the same $0.02 price point.\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 crawl. The actual data or functionality behind the `/api/v1/customers/83` endpoint is unclear — the name \"Premium API Access\" is generic and does not describe what data is returned.","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","USDC pay-per-call","Base network API","lowpaymentfee","crypto API access","402 payment protocol"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The purpose and response format of /api/v1/customers/83 is unknown — 'Premium API Access' is a generic label","No request body schema or response schema documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/83","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/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of the /customers/83 endpoint is entirely opaque. The docs pages are empty beyond a wallet-connect 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'/api/v1/customers/83':104,227 '/docs':186 '/pricing':187 '/readme':190 '/request':13,28 '0.02':12,27,60,134,178 '000':129 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':151 '20':128 '402 payment protocol' '6':139 'Base network API' 'USDC pay-per-call' 'accept':120 'access':110,235 'across':45 'actual':221 'addit':156 'address':150 'advertis':155 'ai/ml':48 'analysi':160 'analyt':47 'api':5,20,37,72,109,234 'application/json':113 'attach':88 'avail':216 'base':8,23,68,114,130,146 'behind':225 'broader':153 'call':4,19,142 'caller':87 'challeng':118 'charg':124 'classif':163 'commit':79 'connect':196 'content':202 'convers':171 'crawl':219 'crypto API access' 'data':46,51,222,243 'decim':140 'describ':241 'document':181,211 'embed':164 'enabl':36 'endpoint':44,56,102,157,228 'exampl':215 'exchang':167 'extrem':183 'feed':166 'finance/web3':50 'function':224 'generic':237 'geocod':169 'handl':84 'header':91 'immedi':99 'infer':49 'infrastructur':53 'inlin':86 'json-api' 'key':73 'l2':147 'limit':76 'list':106 'lowpaymentfee' 'lowpaymentfee.com':31 'maximum':126 'micropayment API' 'name':232 'network':9,24,69,148 'no-api-key' 'offer':40 'openapi':206 'page':191 'pay':2,17 'pay-per-cal':1,16 'pay-per-request' 'payabl':63 'payment':85,90 'per':3,18,61,141 'platform':6,21,38,154 'point':180 'post':121 'post-method' 'premium':108,233 'price':58,165,179 'prompt':198 'protocol':83 'rate':75,168 'receiv':96 'render':193 'request':62,94,122 'request/response':209 'requir':80 'respons':98 'return':112,245 'schema':210 'sentiment':159 'settl':143 'sinc':136 'spars':184 'spec':207 'specif':101 'summar':162 'text':161 'unclear':230 'unit':131 'usag':214 'usd':135 'usdc':15,30,65,133,137 'usdc-base-network' 'use':138 'util':54 'valid':170 'varieti':42 'via':10,25 'wallet':197 'x402':11,26,35,82,117 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"58334fa2-47b3-4371-a771-b39b8fa9ee0a","listingId":"26aad1c8-eec5-4822-a1dd-6adaa012a770","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/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:09.207Z"}],"sources":[{"listingId":"26aad1c8-eec5-4822-a1dd-6adaa012a770","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/83","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:09.207Z","lastSeenAt":"2026-04-24T23:02:34.271Z"}],"details":{"listingId":"26aad1c8-eec5-4822-a1dd-6adaa012a770","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/83 \\\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/83"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/customers/83"}],"useCases":["Accessing premium data endpoints without API key registration","Making one-off API calls with per-request USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access"],"bestFor":["Developers who want zero-signup API access via crypto micropayments","AI agents that can settle x402 payments autonomously on Base","Users who prefer pay-per-call pricing over subscription models"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.796Z"},"updatedAt":"2026-04-24T23:02:34.271Z"}}