{"id":"e789c3da-21be-42d7-95c5-ccfe5c4aea6c","shortId":"fJcWPd","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 rate limits — callers simply attach a payment header to each request.\n\nThe specific endpoint at `/api/v1/payments/389` 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` using the exact payment scheme. 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 and response schemas of these endpoints are not verifiable from the crawl material.","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","USDC API","Base network API","lowpaymentfee","premium API access"],"warnings":["No documentation available — docs, pricing, and API pages all render only 'Connect wallet'","The specific functionality of /api/v1/payments/389 ('Premium API Access') is not described anywhere on the site","No request or response schema is documented; callers cannot know what to send or expect back","No OpenAPI spec or machine-readable API description found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/389","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/389","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 with clear pricing. 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' at /api/v1/payments/389 is not described anywhere. This is effectively a stub 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'/request':12,28 '0.02':11,27,76,126,185 '000':121 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':141 '20':120 '402':115 '6':131 'Base network API' 'USDC API' 'accept':149 'access':111 'account':88 'across':52 'actual':211 'address':140 'advertis':158 'ai/ml':55 'analysi':162 'analyt':54 'api':5,14,21,30,39,86,110,200 'application/json':154 'attach':94 'base':8,24,67,122,134 'base-network' 'beyond':190 'broad':44 'broader':156 'call':4,20 'caller':92 'catalog':45 'challeng':116 'classif':165 'connect':206 'convers':177 'crawl':224 'data':53,179 'decim':132 'doc':197 'document':189 'elimin':82 'embed':166 'enabl':38 'endpoint':51,62,103,148,159,218 'estim':174 'exact':144 'exchang':169 'extrem':195 'feed':168 'finance/web3':57 'function':212 'gas':173 'generat':180 'geocod':175 'header':97 'howev':188 'infer':56 'json-response' 'key':15,31,87 'land':192 'limit':91 'list':107 'lowpaymentfee' 'lowpaymentfee.com':33 'made':138 'materi':225 'micropayment API' 'need':84 'network':68 'no-api-key' 'offer':42 'page':193,201 'pay':2,18,48 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':47 'payment':96,136,145 'per':3,19,49,77 'platform':6,22,40,157 'point':187 'post':150 'post-method' 'premium':109 'premium API access' 'price':74,167,186,198 'prompt':208 'protocol':81 'quot':172 'rate':90,170 'render':203 'request':50,78,100,117,151 'requir':16,32 'respons':214 'return':113,153 'schema':215 'scheme':146 'sentiment':161 'servic':60 'settl':64 'simpli':93 'sinc':128 'spars':196 'specif':102 'summar':164 'text':163 'token':171 'uniform':73 'unit':123 'usd':127 'usdc':70,125,129 'usdc-settlement' 'use':69,130,142 'util':59 'valid':176 'verifi':221 'via':9,25 'wallet':207 'x402':10,26,37,80 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"22be7fd0-16b7-4564-8a51-1eb7abd5a65a","listingId":"e789c3da-21be-42d7-95c5-ccfe5c4aea6c","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/389","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:41.657Z"}],"sources":[{"listingId":"e789c3da-21be-42d7-95c5-ccfe5c4aea6c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/389","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:41.657Z","lastSeenAt":"2026-04-24T03:03:26.717Z"}],"details":{"listingId":"e789c3da-21be-42d7-95c5-ccfe5c4aea6c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/389 \\\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, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units USDC on Base (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/payments/389"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/payments/389"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/389"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Programmatic access to utility or data endpoints with per-call crypto payment","Testing x402 payment flows on Base with low-cost endpoints"],"bestFor":["Developers or agents wanting zero-signup API access via x402","Low-cost per-request usage without subscriptions or commitments","Base/USDC-native workflows needing simple pay-as-you-go endpoints"],"notFor":["Users who need detailed API documentation or response schema guarantees before calling","High-volume use cases where $0.02/request adds up and bulk pricing would be preferred","Users without USDC on Base or unfamiliar with x402 payment protocol"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.311Z"},"updatedAt":"2026-04-24T03:03:26.717Z"}}