{"id":"47c4801c-481f-431c-be2c-a3c8ae3be852","shortId":"Q7NtMF","kind":"x402","title":"x402-gated notification endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated notification endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource `/api/v1/notifications/36` accepts POST requests and charges 0.02 USDC per call (20,000 base units of USDC on the Base network, where USDC has 6 decimals). Payment is settled on-chain to a Base address using the exact payment scheme with a 300-second timeout.\n\nThe broader lowpaymentfee.com platform advertises a suite of x402-gated APIs across several 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 endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nHowever, the specific endpoint being listed here (`/api/v1/notifications/36`) is not described in any of the site's public documentation or landing page categories. Its exact functionality is unclear — the name suggests it may deliver or trigger a notification resource identified by ID 36, but no schema, example payloads, or documentation were found. The endpoint is confirmed live (returns a valid 402 x402 challenge), but the lack of documentation about what it actually returns or expects as input is a significant gap.","tags":[],"capabilities":["x402-payment","usdc-base","post-endpoint","notifications","pay-per-request"],"categories":["notifications","infrastructure"],"synonyms":["notification API","x402 notification","premium notification endpoint","lowpaymentfee notifications","pay-per-call notification","Base USDC API"],"warnings":["The endpoint /api/v1/notifications/36 is not listed or documented on the provider's landing page or any crawled page.","No input or output schema is available — the actual request body format and response structure are unknown.","The /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no useful content.","The notification resource ID '36' is hardcoded in the URL; it is unclear if other IDs exist or what they represent."],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/36","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/36","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 402 challenge, but there is no documentation, no input/output schema, and the specific notifications/36 resource is not mentioned anywhere on the provider's site. Functionality must be entirely guessed from the URL path. This is effectively a stub 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'0.02':9,22,49,141 '000':54 '20':53 '300':85 '36':197 '402':215 '6':66 'Base USDC API' 'accept':44 'access':34 'across':100 'actual':226 'address':77 'advertis':92 'ai':110 'analysi':114 'analyt':104 'api':33,99,146 'base':7,20,55,61,76 'broader':89 'call':52 'categori':102,177 'chain':73 'challeng':217 'charg':48 'classif':117 'commit':154 'confirm':210 'convers':134 'data':103,107 'decim':67 'deliv':188 'describ':165 'document':173,204,222 'embed':118 'endpoint':5,18,28,137,158,208 'estim':128 'exact':80,179 'exampl':201 'exchang':123 'expect':229 'export':108 'feed':122 'financ':119 'found':206 'function':180 'gap':235 'gas':127 'gate':3,16,98 'generat':135 'geocod':132 'howev':155 'id':196 'identifi':194 'infrastructur':130 'input':231 'insight':109 'key':147 'lack':220 'land':175 'learn':112 'limit':150 'list':139,160 'live':211 'lowpaymentfee notifications' 'lowpaymentfee.com':30,90 'machin':111 'may':187 'metric':105 'minimum':153 'name':184 'network':62 'notif':4,17,192 'notification API' 'notifications' 'on-chain':71 'page':176 'pay':8,21 'pay-per-call notification' 'pay-per-request' 'payload':202 'payment':38,68,81 'per':10,23,51,142 'platform':91 'post':45 'post-endpoint' 'premium':32 'premium notification endpoint' 'price':121 'protocol':39 'provid':31 'public':172 'quot':126 'rate':124,149 'report':106 'request':11,24,46,143 'resourc':42,193 'return':212,227 'schema':200 'scheme':82 'second':86 'sentiment':113 'settl':70 'sever':101 'signific':234 'site':170 'specif':41,157 'suggest':185 'suit':94 'summar':116 'text':115 'timeout':87 'token':125 'trigger':190 'unclear':182 'unit':56 'usdc':13,26,50,58,64 'usdc-base' 'use':78 'util':131 'valid':133,214 'via':35 'web3':120 'x402':2,15,37,97,216 'x402 notification' 'x402-gated':1,14,96 'x402-payment'","prices":[{"id":"1f63f474-e8f9-4689-852c-ec394cdd7772","listingId":"47c4801c-481f-431c-be2c-a3c8ae3be852","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/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:29.104Z"}],"sources":[{"listingId":"47c4801c-481f-431c-be2c-a3c8ae3be852","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/36","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:29.104Z","lastSeenAt":"2026-04-22T02:32:10.663Z"}],"details":{"listingId":"47c4801c-481f-431c-be2c-a3c8ae3be852","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/36 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/notifications/36"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/notifications/36"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The site advertises categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Triggering or retrieving a specific notification via a paid API call","Integrating pay-per-use notification delivery into an agent workflow","Accessing premium notification data without API key management"],"bestFor":["Agents that need on-demand notification access with crypto micropayments","Developers wanting keyless, pay-per-request API access on Base","Workflows requiring x402-compatible notification endpoints"],"notFor":["Users needing detailed documentation or guaranteed SLAs before integrating","High-volume notification use cases where per-request pricing is inefficient","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.618Z"},"updatedAt":"2026-04-22T02:32:10.663Z"}}