{"id":"d637c722-be95-497d-bdde-8c60f14bf145","shortId":"MtXuDx","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/payments/54` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per call (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises endpoints across four categories: 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 listed endpoints share the same $0.02/request pricing model.\n\nThis particular endpoint (`/api/v1/payments/54`) does not have detailed documentation about its specific input/output schema beyond the x402 challenge metadata. The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional technical content. As a result, the exact functionality behind this \"Premium API Access\" label is unclear — it may be a generic or demo endpoint rather than a specialized service.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","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, pricing, and README pages all return only a 'Connect wallet' prompt","No input or output schema provided for this endpoint beyond the x402 challenge metadata","The specific functionality of /api/v1/payments/54 is unclear; 'Premium API Access' is a generic label","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/54","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/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no input/output schema, and no examples for what this specific endpoint actually does. The docs, pricing, and README pages all returned only 'Connect wallet' with no content. The endpoint's purpose beyond its generic 'Premium API Access' label is 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'/request':13,28,167 '0.02':12,27,87,166 '000':82 '0x8335':72 '20':81 '2913':73 '6':92 'Base network API' 'USDC micropayment API' 'accept':63 'access':7,22,42,61,218 'across':124 'addit':205 'advertis':122 'ai':134 'amount':79 'analysi':138 'analyt':128 'api':6,21,40,60,95,217 'attach':106 'base':9,24,50,75,83 'base-network' 'behind':214 'beyond':184 'broader':119 'call':4,19,89 'caller':104 'categori':126 'challeng':187 'classif':141 'collect':34 'commit':101 'connect':200 'content':207 'contract':71 'convers':158 'crawl':190 'crypto-paid API' 'data':127,131 'decim':93 'demo':228 'detail':177 'doc':191 'document':178 'embed':142 'endpoint':41,54,123,162,172,229 'equal':86 'estim':152 'exact':212 'exchang':147 'export':132 'feed':146 'financ':143 'four':125 'function':213 'gas':151 'generat':159 'generic':226 'geocod':156 'header':111 'host':32 'infrastructur':154 'input/output':182 'insight':133 'key':96 'label':58,219 'learn':136 'limit':98 'list':161 'lowpaymentfee' 'lowpaymentfee.com':31,120 'machin':135 'maximum':78 'may':223 'metadata':188 'metric':129 'model':169 'network':51 'no-api-key' 'page':195 'particular':171 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,66,110,116 'per':3,18,38,88 'platform':121 'post':64 'post-endpoint' 'premium':5,20,59,216 'premium API access' 'price':145,168,192 'prompt':202 'proof':117 'protocol':47 'quot':150 'rate':97,148 'rather':230 'readm':194 'report':130 'request':39,65 'requir':103 'result':210 'return':197 'schema':183 'sentiment':137 'servic':234 'settl':68 'share':163 'simpli':105 'special':233 'specif':53,181 'summar':140 'technic':206 'text':139 'token':149 'unclear':221 'unit':84 'upfront':100 'usdc':15,30,70,90 'usdc-settlement' 'use':91 'util':155 'valid':114,157 'via':10,25,43 'wallet':201 'web3':144 'x':109 'x-payment':108 'x402':11,26,45,115,186 'x402 API' 'x402-payment'","prices":[{"id":"4580fce4-c78f-4b1c-b627-91436b083d80","listingId":"d637c722-be95-497d-bdde-8c60f14bf145","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/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:49.540Z"}],"sources":[{"listingId":"d637c722-be95-497d-bdde-8c60f14bf145","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/54","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:49.540Z","lastSeenAt":"2026-04-23T09:31:18.015Z"}],"details":{"listingId":"d637c722-be95-497d-bdde-8c60f14bf145","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/54 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/54"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/54"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Programmatic pay-per-call access to various utility endpoints","Testing x402 payment protocol integrations on Base"],"bestFor":["Developers exploring x402 payment-gated APIs","AI agents that can settle USDC payments on Base","Low-volume, no-commitment API consumption at $0.02/call"],"notFor":["High-volume use cases where per-call pricing adds up quickly","Users who need detailed API documentation and guaranteed SLAs","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.983Z"},"updatedAt":"2026-04-23T09:31:18.015Z"}}