{"id":"24290c8a-496f-4a6b-bf50-71fe00641b93","shortId":"zhVwj7","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/75` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI/ML, finance/Web3, and infrastructure utilities. All endpoints use the x402 payment protocol, settling in USDC on the Base network at $0.02 per call. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint probed (`/api/v1/notifications/75`) is listed under the title \"Premium API Access\" but its exact functionality is unclear from the available documentation. The provider's landing page does not list a notifications category or describe what this endpoint returns. It accepts POST requests and returns `application/json`. The x402 challenge confirms it is live, requesting a maximum of 20,000 base units of USDC (6 decimals), which equals $0.02.\n\nThe broader lowpaymentfee.com platform advertises endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. No OpenAPI schema, detailed request/response documentation, or usage examples were found during the crawl.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","notifications","json-response","no-api-key"],"categories":["notifications","infrastructure"],"synonyms":["premium API access","notification API","lowpaymentfee","x402 notification","pay-per-call API","micropayment API","Base USDC API"],"warnings":["The specific endpoint /api/v1/notifications/75 is not listed on the provider's landing page and its purpose is undocumented.","No OpenAPI spec, request schema, or response schema is available.","No usage examples or detailed documentation were found — /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt.","The endpoint's actual behavior (what notification 75 refers to) is unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/75","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/75","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 describing what the notifications/75 endpoint actually does, no request/response schema, and no examples. The provider's landing page does not even list a notifications category. This is effectively a stub 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'/request':201 '0.02':11,26,74,164,200 '000':155 '20':154 '6':160 'Base USDC API' 'accept':137 'access':108 'account':80 'advertis':169 'ai/ml':54 'analysi':178 'analyt':53 'api':50,78,107 'application/json':142 'attach':88 'avail':117 'base':8,23,71,156 'base-network' 'broader':166 'call':4,19,76 'caller':86 'categori':129 'challeng':145 'classif':181 'collect':44 'confirm':146 'convers':193 'crawl':217 'data':52,174 'decim':161 'describ':131 'detail':207 'document':118,209 'embed':182 'endpoint':6,21,32,60,98,134,170 'equal':163 'estim':190 'exact':111 'exampl':212 'exchang':185 'export':175 'feed':184 'finance/web3':55 'found':214 'function':112 'gas':189 'generat':195 'geocod':191 'header':92 'infrastructur':57 'insight':176 'json-response' 'key':79 'land':122 'limit':83 'list':102,126 'live':149 'lowpaymentfee' 'lowpaymentfee.com':39,167 'maximum':152 'metric':172 'micropayment API' 'network':72 'no-api-key' 'notif':5,20,128 'notification API' 'notifications' 'offer':42 'openapi':205 'page':123 'part':36 'pay':2,17,47 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':46 'payment':64,91 'per':3,12,18,27,48,75 'platform':40,168 'point':203 'post':138 'premium':106 'premium API access' 'price':183,202 'probe':99 'protocol':65 'provid':120 'quot':188 'rate':82,186 'report':173 'request':13,28,49,95,139,150 'request/response':208 'requir':85 'return':135,141 'schema':206 'sentiment':177 'settl':66 'simpli':87 'span':51 'specif':97 'summar':180 'text':179 'titl':105 'token':187 'unclear':114 'unit':157 'usag':211 'usdc':15,30,68,159 'usdc-settlement' 'use':61 'util':58 'valid':192 'via':9,24 'x402':10,25,63,90,144 'x402 notification' 'x402-payment'","prices":[{"id":"26382eea-8b69-4ffc-a3c2-9a550378e41c","listingId":"24290c8a-496f-4a6b-bf50-71fe00641b93","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/75","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:29.289Z"}],"sources":[{"listingId":"24290c8a-496f-4a6b-bf50-71fe00641b93","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/75","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:29.289Z","lastSeenAt":"2026-04-22T02:32:10.931Z"}],"details":{"listingId":"24290c8a-496f-4a6b-bf50-71fe00641b93","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/75 \\\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 provider advertises $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 x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/notifications/75"},{"claim":"The provider lists endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Triggering or retrieving notifications via a single paid API call","Integrating pay-per-use notification delivery into agent workflows","Testing x402 payment flows against a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 protocol integrations","Agents needing simple pay-per-call endpoints without API key management","Low-volume, on-demand notification retrieval"],"notFor":["High-volume notification pipelines where per-call fees add up","Use cases requiring detailed API documentation or SLAs","Users who need non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.36Z"},"updatedAt":"2026-04-22T02:32:10.931Z"}}