{"id":"77c30ed6-b677-4d31-99f9-25950b844448","shortId":"GdwUn8","kind":"x402","title":"Pay-per-call notification endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call notification endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at `/api/v1/notifications/47` is part of the lowpaymentfee.com platform, which offers a broad suite of pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3, and infrastructure utilities. All endpoints are gated via the x402 protocol, requiring a USDC payment on the Base network for each call — no API keys, no rate limits, no subscriptions.\n\nThe specific endpoint probed (`/api/v1/notifications/47`) is labeled \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (asset `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base, 6 decimals), which equals $0.02 per request. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nThe broader platform lists 16 endpoints across four categories (Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure), all priced uniformly at $0.02 per request. However, the specific functionality behind the `/notifications/47` path is not documented — the crawl material provides no schema, request/response examples, or description beyond the generic \"Premium API Access\" label. The endpoint is live (returns a valid 402 challenge), but what it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","notifications","post-method"],"categories":["notifications","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 notification","USDC API","Base network API","pay-per-call API","micropayment API"],"warnings":["No documentation exists for the /notifications/47 endpoint — its actual functionality is unknown.","No request body schema or response schema is provided.","The crawl pages for /api, /pricing, and /README returned only 'Connect wallet' with no useful content.","The endpoint path includes a numeric ID (47) suggesting it may be resource-specific, but no context is given."],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/47","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/notifications/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation on what the /notifications/47 endpoint actually does, no request/response schema, and no examples. The listing is effectively a stub with only pricing and protocol details 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'/notifications/47':170 '/request':16,32 '0.02':15,31,127,161 '000':114 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':134 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':120 '16':144 '20':113 '300':137 '402':199 '6':123 'Base network API' 'USDC API' 'accept':102 'access':100,190 'across':146 'actual':204 'advertis':108 'ai':151 'ai/ml':57 'amount':111 'analyt':56,150 'api':53,84,99,189 'asset':119 'base':8,24,78,115,122 'behind':168 'beyond':185 'broad':46 'broader':141 'call':4,20,82 'categori':148 'challeng':107,200 'crawl':176 'data':55,149 'decim':124 'descript':184 'document':174 'endpoint':6,22,34,65,93,145,193 'equal':126 'exampl':182 'financ':59,154 'four':147 'function':167 'gate':67 'generic':187 'howev':164 'infer':58 'infrastructur':62,156 'key':85 'label':97,191 'learn':153 'limit':88 'list':143 'live':195 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':152 'materi':177 'maximum':110 'micropayment API' 'network':79 'notif':5,21 'notifications' 'offer':44 'part':38 'path':171 'pay':2,18,50 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':49 'payment':75,130,208 'per':3,19,51,128,162 'platform':42,142 'post':103 'post-method' 'premium':98,188 'price':158 'probe':94 'protocol':71 'provid':178 'rate':87 'request':52,104,129,163 'request/response':181 'requir':72 'return':196,205 'schema':180 'second':138 'sent':132 'settl':11,27 'span':54 'specif':92,166 'subscript':90 'success':207 'suit':47 'timeout':139 'uniform':159 'unit':116 'unknown':210 'upon':206 'usdc':13,29,74,118 'usdc-base' 'util':63 'valid':198 'via':9,25,68 'web3':60,155 'x402':10,26,70,106 'x402 notification' 'x402-payment'","prices":[{"id":"161e7d56-c269-4082-9a13-c31a7eeca269","listingId":"77c30ed6-b677-4d31-99f9-25950b844448","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/notifications/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:29.189Z"}],"sources":[{"listingId":"77c30ed6-b677-4d31-99f9-25950b844448","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/47","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:29.189Z","lastSeenAt":"2026-04-22T02:32:10.780Z"}],"details":{"listingId":"77c30ed6-b677-4d31-99f9-25950b844448","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/47 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/notifications/47"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/notifications/47"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists 16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Triggering a notification via a single paid API call without needing an API key","Integrating pay-per-use notification delivery into an agent workflow","Testing x402 payment flows on Base with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that need keyless, pay-per-call access to notification services","Low-volume, on-demand notification triggers without subscription overhead"],"notFor":["High-volume notification pipelines where per-call pricing is inefficient","Use cases requiring detailed API documentation or guaranteed SLAs","Users who need to understand the exact response schema before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.475Z"},"updatedAt":"2026-04-22T02:32:10.780Z"}}