{"id":"616419d6-ca34-4b3a-acfb-84fda078d94a","shortId":"DXwmFv","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 lowpaymentfee.com provides a \"Premium API Access\" notification resource at `/api/v1/notifications/35`. It is part of a broader platform offering dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network via the x402 protocol.\n\nThe specific `/api/v1/notifications/35` endpoint accepts POST requests and returns `application/json`. Payment is handled inline: callers attach an `X-PAYMENT` header containing a signed x402 payment for up to 20,000 base units of USDC (i.e., $0.02) to the payee address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. No API keys, accounts, or rate limits are advertised — access is purely gated by micropayment.\n\nDocumentation is minimal. The platform's landing page lists endpoint paths and prices but provides no request/response schemas, parameter descriptions, or usage examples. The exact functionality behind the \"notifications/35\" resource is not documented — it could be a notification retrieval, creation, or delivery endpoint. Without further documentation or example payloads, callers will need to experiment or contact the provider to understand the expected input and output formats.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","notifications"],"categories":["notifications","infrastructure"],"synonyms":["notification API","premium API access","x402 notification","micropayment API","pay-per-call API","lowpaymentfee","USDC API"],"warnings":["No API documentation exists for /api/v1/notifications/35 — the purpose and expected payload are undocumented.","No request or response schema is available; callers must guess at the expected input format.","The broader platform lists many endpoints but none have detailed docs beyond a name and price.","The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/35","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/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no documentation for the notifications/35 resource — no request schema, no response schema, no parameter descriptions, and no usage examples. The endpoint's actual functionality is 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'/request':16,32 '0.02':15,31,75,126 '000':120 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':131 '20':119 'USDC API' 'accept':94 'access':41,141 'account':135 'address':130 'advertis':140 'ai/ml':65 'analyt':64 'api':40,60,133 'application/json':99 'attach':105 'base':8,24,84,121 'base-network' 'behind':173 'broader':51 'call':4,20 'caller':104,196 'contact':202 'contain':111 'could':181 'creation':186 'data':63,68 'deliveri':188 'descript':166 'document':147,179,192 'dozen':54 'endpoint':6,22,34,61,93,156,189 'exact':171 'exampl':169,194 'expect':208 'experi':200 'finance/web3':67 'format':212 'function':172 'gate':144 'handl':102 'header':110 'i.e':125 'infer':66 'infrastructur':70 'inlin':103 'input':209 'json-response' 'key':134 'land':153 'limit':138 'list':155 'lowpaymentfee' 'lowpaymentfee.com':36 'micropay':146 'micropayment API' 'minim':149 'need':198 'network':85 'no-api-key' 'notif':5,21,42,184 'notification API' 'notifications' 'notifications/35':175 'offer':53 'output':211 'page':154 'paramet':165 'part':48 'path':157 'pay':2,18,57 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':56 'paye':129 'payload':195 'payment':100,109,115 'per':3,19,58,76 'platform':52,151 'post':95 'premium':39 'premium API access' 'price':73,159 'protocol':89 'provid':37,161,204 'pure':143 'rate':137 'request':59,77,96 'request/response':163 'resourc':43,176 'retriev':185 'return':98 'schema':164 'settl':11,27,79 'sign':113 'span':62 'specif':91 'understand':206 'unit':122 'usag':168 'usdc':13,29,81,124 'usdc-settlement' 'util':71 'via':9,25,86 'without':190 'x':108 'x-payment':107 'x402':10,26,88,114 'x402 notification' 'x402-payment'","prices":[{"id":"2782dcfb-0ace-46cf-8cb4-18d0f423e464","listingId":"616419d6-ca34-4b3a-acfb-84fda078d94a","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/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.963Z"}],"sources":[{"listingId":"616419d6-ca34-4b3a-acfb-84fda078d94a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.963Z","lastSeenAt":"2026-04-22T02:32:10.454Z"}],"details":{"listingId":"616419d6-ca34-4b3a-acfb-84fda078d94a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/35 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\" \\\n  -d '{}'","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 of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/notifications/35"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/notifications/35"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Sending or retrieving notifications via a pay-per-call model without API key management","Integrating notification functionality into agent workflows that settle payments in USDC on Base","Testing x402 micropayment flows against a live, low-cost endpoint"],"bestFor":["Developers exploring x402 protocol integration with minimal cost","Agent-based systems that need stateless, key-free API access","Micropayment-gated notification delivery or retrieval"],"notFor":["Production notification systems requiring documented SLAs and schemas","High-volume notification pipelines where per-request pricing is impractical","Users who need detailed API documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.844Z"},"updatedAt":"2026-04-22T02:32:10.454Z"}}