{"id":"d921d676-befb-4567-a26c-5b01bbea4f34","shortId":"9Arbgn","kind":"x402","title":"Pay-per-call notification endpoint on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call notification endpoint on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at `/api/v1/notifications/49` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint is labeled \"Premium API Access\" and accepts POST requests. Payment is 20,000 base units of USDC (6 decimals), which equals $0.02 per call. No API keys or rate limits are advertised — callers simply attach an x402 payment header to each request.\n\nThe broader lowpaymentfee.com platform lists endpoints across four categories: Data & Analytics (metrics, reports, export, insights), AI & Machine Learning (sentiment analysis, summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). All are priced at $0.02 per request. However, this specific listing covers only the `/api/v1/notifications/49` endpoint, whose exact functionality is not documented beyond the \"Premium API Access\" label. There is no OpenAPI schema, no request/response examples, and the crawled docs and pricing pages returned only a wallet-connect prompt with no additional detail.\n\nBecause the endpoint's actual behavior (what notification data it returns or what input it expects) is undocumented, callers should treat this as an exploratory integration. The x402 challenge is live and well-formed, confirming the endpoint is operational and ready to accept payments.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","notifications","post-method"],"categories":["notifications","infrastructure"],"synonyms":["premium API","notification API","x402 notification","lowpaymentfee","pay-per-call API","USDC API","Base network API"],"warnings":["No OpenAPI or JSON schema available — request and response formats are unknown","Endpoint purpose ('notifications/49') is undocumented; 'Premium API Access' is a generic label","Docs, pricing, and README pages return only a wallet-connect prompt with no substantive content","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/49","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/49","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/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, and the endpoint's actual functionality beyond the generic 'Premium API Access' label is completely undocumented. The docs, pricing, and README pages all resolve to a wallet-connect stub with no useful 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'0.02':11,26,86,150 '000':77 '20':76 '6':82 'Base network API' 'USDC API' 'accept':71,243 'access':69,172 'across':113 'actual':204 'addit':198 'advertis':96 'ai':122 'analysi':126 'analyt':117 'api':50,68,90,171 'attach':99 'base':8,23,58,78 'base-network' 'behavior':205 'beyond':168 'broader':108 'call':4,19,88 'caller':97,218 'categori':115 'challeng':228 'classif':128 'collect':44 'confirm':235 'connect':194 'convers':144 'cover':157 'crawl':184 'data':116,208 'decim':83 'detail':199 'doc':185 'document':167 'embed':129 'endpoint':6,21,32,64,112,161,202,237 'equal':85 'estim':139 'exact':163 'exampl':181 'exchang':134 'expect':215 'exploratori':224 'export':120 'feed':133 'financ':130 'form':234 'four':114 'function':164 'gas':138 'generat':145 'geocod':142 'header':103 'howev':153 'infrastructur':141 'input':213 'insight':121 'integr':225 'key':91 'label':66,173 'learn':124 'limit':94 'list':111,156 'live':230 'lowpaymentfee' 'lowpaymentfee.com':39,109 'machin':123 'metric':118 'network':59 'notif':5,20,207 'notification API' 'notifications' 'offer':42 'openapi':177 'oper':239 'page':188 'part':36 'pay':2,17,47 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':46 'payment':74,102,244 'per':3,12,18,27,48,87,151 'platform':40,110 'post':72 'post-method' 'premium':67,170 'premium API' 'price':132,148,187 'prompt':195 'protocol':55 'quot':137 'rate':93,135 'readi':241 'report':119 'request':13,28,49,73,106,152 'request/response':180 'return':189,210 'schema':178 'sentiment':125 'settl':51 'simpli':98 'specif':63,155 'summar':127 'token':136 'treat':220 'undocu':217 'unit':79 'usdc':15,30,61,81 'usdc-settlement' 'use':60 'valid':143 'via':9,24,52 'wallet':193 'wallet-connect':192 'web3':131 'well':233 'well-form':232 'whose':162 'x402':10,25,54,101,227 'x402 notification' 'x402-payment'","prices":[{"id":"8e0c5ae3-ec2e-45a9-bf13-576bd65d8a3e","listingId":"d921d676-befb-4567-a26c-5b01bbea4f34","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:29.269Z"}],"sources":[{"listingId":"d921d676-befb-4567-a26c-5b01bbea4f34","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:29.269Z","lastSeenAt":"2026-04-22T02:32:10.897Z"}],"details":{"listingId":"d921d676-befb-4567-a26c-5b01bbea4f34","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/49 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 in USDC (asset 0x8335…) on Base network, equaling $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/notifications/49"},{"claim":"All endpoints on the platform 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 APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving notification data on a per-call payment basis","Integrating pay-per-request notifications into agent workflows","Testing x402 micropayment flows against a live endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","Agents needing low-cost, keyless API access on Base","One-off or low-volume notification lookups without subscriptions"],"notFor":["Production systems requiring documented request/response schemas","High-throughput notification streaming (no documented batch or websocket support)","Users who need fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.343Z"},"updatedAt":"2026-04-22T02:32:10.897Z"}}