{"id":"c00b71eb-9f68-42de-a893-45b278fa4cbd","shortId":"nKmL8p","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and utility services. All endpoints are settled on the Base network using USDC, with a uniform price of $0.02 per request. The x402 protocol eliminates the need for API keys, accounts, or subscriptions — callers simply attach a payment header to each request.\n\nThe specific endpoint at `/api/v1/payments/188` 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 made 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, and API pages all render only a \"Connect wallet\" prompt), so the actual functionality, request schemas, and response formats for any of these endpoints are unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","base-network","usdc-settlement","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","micropayment API","Base USDC API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No documentation available — docs, pricing, and API pages all show only 'Connect wallet'","No request or response schema provided for this endpoint","The purpose of '/api/v1/payments/188' ('Premium API Access') is not described anywhere","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/188","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/188","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 pricing and network. However, there is no OpenAPI schema, no documentation of request/response formats, and the docs/pricing/API pages are all blank beyond a wallet connect prompt. The actual functionality behind 'Premium API Access' is completely 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'/request':12,28 '0.02':11,27,76,125,184 '000':120 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':140 '20':119 '300':143 '402':114 '402 payment API' '6':130 'Base USDC API' 'accept':148 'access':110 'account':88 'across':52 'actual':210 'address':139 'advertis':157 'ai/ml':55 'analysi':161 'analyt':54 'api':5,14,21,30,39,86,109,199 'application/json':153 'attach':93 'base':8,24,67,121,133 'base-network' 'beyond':189 'broad':44 'broader':155 'call':4,20 'caller':91 'catalog':45 'challeng':115 'classif':164 'connect':205 'convers':176 'crypto-paid API' 'data':53,178 'decim':131 'doc':196 'document':188 'elimin':82 'embed':165 'enabl':38 'endpoint':51,62,102,147,158,221 'estim':173 'exchang':168 'extrem':194 'feed':167 'finance/web3':57 'format':216 'function':211 'gas':172 'generat':179 'geocod':174 'header':96 'howev':187 'infer':56 'json-response' 'key':15,31,87 'land':191 'list':106 'lowpaymentfee' 'lowpaymentfee.com':33 'made':137 'micropayment API' 'need':84 'network':68 'no-api-key' 'offer':42 'page':192,200 'pay':2,18,48 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':47 'payment':95,135 'per':3,19,49,77 'platform':6,22,40,156 'point':186 'post':149 'post-method' 'premium':108 'price':74,166,185,197 'prompt':207 'protocol':81 'quot':171 'rate':169 'render':202 'request':50,78,99,116,150,212 'requir':16,32 'respons':215 'return':112,152 'schema':213 'second':144 'sentiment':160 'servic':60 'settl':64 'simpli':92 'sinc':127 'spars':195 'specif':101 'subscript':90 'summar':163 'text':162 'timeout':145 'token':170 'uniform':73 'unit':122 'unknown':223 'usd':126 'usdc':70,124,128 'usdc-settlement' 'use':69,129 'util':59 'valid':175 'via':9,25 'wallet':206 'x402':10,26,37,80 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"79a55245-fef7-43b7-aff4-ae445ad94dd4","listingId":"c00b71eb-9f68-42de-a893-45b278fa4cbd","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/188","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:47.935Z"}],"sources":[{"listingId":"c00b71eb-9f68-42de-a893-45b278fa4cbd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/188","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:47.935Z","lastSeenAt":"2026-04-24T08:03:14.522Z"}],"details":{"listingId":"c00b71eb-9f68-42de-a893-45b278fa4cbd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/188 \\\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":"Uniform pricing of $0.02 per request across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units USDC on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/payments/188"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/payments/188"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/188"}],"useCases":["Accessing API services without creating accounts or managing API keys","Making one-off API calls with instant crypto micropayments","Integrating pay-per-use endpoints into autonomous agent workflows","Testing x402 protocol integrations against a live endpoint"],"bestFor":["Developers wanting zero-friction API access without subscriptions","AI agents that need to autonomously purchase API calls on Base","Projects exploring x402 payment protocol integration"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume use cases where $0.02/request adds up significantly","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.939Z"},"updatedAt":"2026-04-24T08:03:14.522Z"}}