{"id":"f5d15164-bba3-4341-b626-1cdebda01df8","shortId":"TUC7B3","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/payments/245` is labeled \"Premium API Access\" and charges up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, accounts, or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point. However, the specific functionality behind the `/api/v1/payments/245` endpoint is not documented beyond its \"Premium API Access\" label.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live via a valid 402 challenge, but what it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","The specific functionality of /api/v1/payments/245 is completely undocumented; 'Premium API Access' is the only descriptor","No request or response schema is provided; callers cannot know what to send or what to expect back","The platform lists many API categories (AI, finance, data, etc.) but none are documented with specs or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/245","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/245","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, but there is zero documentation on what the endpoint actually does or returns. No OpenAPI spec, no request/response schemas, no examples. The docs pages are empty beyond a wallet-connect prompt. The 'Premium API Access' label is generic and 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'/request':13,30,155 '0.02':12,29,71,154 '000':75 '20':74 '402':224 '6':81 'Base network API' 'USDC micropayment API' 'accept':50 'access':66,173 'account':86 'actual':229 'addit':195 'advertis':91,109 'ai':121 'analysi':125 'analyt':115 'api':5,15,22,32,42,65,84,111,172,181 'attach':94 'avail':211 'base':8,25,55,76 'behind':162 'beyond':169 'broader':107 'call':4,21,73 'caller':92 'categori':112 'challeng':225 'charg':68 'classif':128 'confirm':219 'connect':190 'content':197 'convers':145 'crawl':214 'crypto-paid API' 'data':114,118 'decim':82 'doc':180 'document':168,175,206 'embed':129 'endpoint':59,148,165,217 'estim':139 'exampl':210 'exchang':134 'export':119 'extrem':177 'feed':133 'financ':130 'function':161 'gas':138 'generat':146 'geocod':143 'header':99 'howev':158 'http-post' 'includ':113 'infrastructur':141 'insight':120 'key':16,33,85 'label':63,174 'learn':123 'limit':89 'list':150 'live':220 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':122 'materi':215 'metric':116 'multipl':110 'network':56 'no-api-key' 'openapi':201 'page':185 'pay':2,19,39 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':38 'payment':52,98,104,233 'per':3,20,40,72 'platform':6,23,43,108 'point':157 'premium':64,171 'premium API access' 'price':132,156,182 'prompt':192 'proof':105 'protocol':48 'quot':137 'rate':88,135 'readm':184 'render':187 'report':117 'request':41 'request/response':204 'requir':17,34 'return':230 'schema':205 'sentiment':124 'simpli':93 'spars':178 'spec':202 'specif':58,160 'success':232 'summar':127 'technic':196 'text':126 'token':136 'unit':77 'unknown':235 'upon':231 'usag':209 'usdc':9,26,51,79 'usdc-base-network' 'use':45 'util':142 'valid':102,144,223 'via':10,27,221 'wallet':191 'web3':131 'x':97 'x-payment':96 'x402':11,28,47,103 'x402 API' 'x402-payment'","prices":[{"id":"09c7442a-4675-4156-90d2-f0b2eb57ab1a","listingId":"f5d15164-bba3-4341-b626-1cdebda01df8","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/245","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:00.839Z"}],"sources":[{"listingId":"f5d15164-bba3-4341-b626-1cdebda01df8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/245","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:00.839Z","lastSeenAt":"2026-04-24T03:03:24.968Z"}],"details":{"listingId":"f5d15164-bba3-4341-b626-1cdebda01df8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/245 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising USDC on Base network, maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/payments/245"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/245"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a premium API endpoint with per-request USDC micropayments on Base","Integrating pay-as-you-go API calls into agent workflows without managing API keys","Testing x402 protocol payment flows against a live endpoint"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost ($0.02) per-request pricing without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-network USDC wallet or x402-compatible client","High-volume use cases where per-request crypto settlement overhead matters"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.296Z"},"updatedAt":"2026-04-24T03:03:24.968Z"}}