{"id":"cd13a187-d4a5-4bee-9e40-712242e3933c","shortId":"mAwseq","kind":"x402","title":"Pay-per-call notification endpoint on Base via x402, settling in USDC at $0.02/request.","tagline":"Pay-per-call notification endpoint on Base via x402, settling in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides a notifications API accessible via the x402 payment protocol. The specific resource `/api/v1/notifications/100` accepts POST requests and charges 20,000 base units of USDC on the Base network per call, which equals $0.02 (USD Coin uses 6 decimals). Payment is handled inline via the X-PAYMENT header — no API keys, accounts, or rate limits are required.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning 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 and settle on the Base network in USDC.\n\nHowever, the specific functionality of the `/api/v1/notifications/100` endpoint is unclear. The x402 challenge describes it only as \"Premium API Access\" with a JSON MIME type response. No OpenAPI schema, request body documentation, or example responses were found in the crawl. The `100` path segment may refer to a notification ID or batch size, but this is unconfirmed. Agents should be aware that the endpoint's actual behavior is undocumented beyond the payment challenge.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","notifications-api","json-response"],"categories":["notifications","infrastructure"],"synonyms":["notification API","push notification endpoint","x402 notifications","pay-per-call notifications","lowpaymentfee notifications","USDC API access","Base network API"],"warnings":["No API documentation or OpenAPI schema available for this endpoint","The exact purpose and expected request body of /api/v1/notifications/100 are unknown","No example responses were found; actual output format is unverified","The broader platform lists many endpoints but none have detailed docs in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/100","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/100","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 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of the notifications/100 endpoint is entirely undescribed. The crawl pages beyond the homepage returned only 'Connect wallet' with no useful 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'/request':16,32 '0.02':15,31,70,147 '000':57 '100':199 '20':56 '6':74 'Base network API' 'USDC API access' 'accept':51 'access':41,177 'account':89 'actual':223 'advertis':99 'agent':215 'ai':116 'analysi':120 'analyt':110 'api':40,87,107,176 'awar':218 'base':8,24,58,64,154 'base-network' 'batch':209 'behavior':224 'beyond':227 'bodi':188 'broader':96 'call':4,20,67,106 'challeng':170,230 'charg':55 'classif':123 'coin':72 'convers':140 'crawl':197 'data':109,113 'decim':75 'describ':171 'document':189 'embed':124 'endpoint':6,22,34,143,165,221 'equal':69 'estim':134 'exampl':191 'exchang':129 'export':114 'feed':128 'financ':125 'found':194 'function':161 'gas':133 'generat':141 'geocod':138 'handl':78 'header':85 'howev':158 'id':207 'infrastructur':136 'inlin':79 'insight':115 'json':180 'json-response' 'key':88 'learn':118 'limit':92 'list':145 'lowpaymentfee notifications' 'lowpaymentfee.com':36,97 'machin':117 'may':202 'metric':111 'mime':181 'network':65,155 'no-api-key' 'notif':5,21,39,206 'notification API' 'notifications-api' 'openapi':185 'path':200 'pay':2,18,104 'pay-per-cal':1,17,103 'pay-per-call' 'pay-per-call notifications' 'payment':45,76,84,229 'per':3,19,66,105,148 'platform':98 'post':52 'premium':175 'price':127 'protocol':46 'provid':37 'push notification endpoint' 'quot':132 'rate':91,130 'refer':203 'report':112 'request':53,149,187 'requir':94 'resourc':49 'respons':183,192 'schema':186 'segment':201 'sentiment':119 'settl':11,27,151 'size':210 'span':108 'specif':48,160 'suit':101 'summar':122 'text':121 'token':131 'type':182 'unclear':167 'unconfirm':214 'undocu':226 'unit':59 'usd':71 'usdc':13,29,61,157 'usdc-settlement' 'use':73 'util':137 'valid':139 'via':9,25,42,80 'web3':126 'x':83 'x-payment':82 'x402':10,26,44,169 'x402 notifications' 'x402-payment'","prices":[{"id":"9431d876-08d5-4b10-85d4-15015be07aff","listingId":"cd13a187-d4a5-4bee-9e40-712242e3933c","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/100","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.132Z"}],"sources":[{"listingId":"cd13a187-d4a5-4bee-9e40-712242e3933c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/100","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.132Z","lastSeenAt":"2026-04-22T04:02:46.603Z"}],"details":{"listingId":"cd13a187-d4a5-4bee-9e40-712242e3933c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/100 \\\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 endpoint returns a 402 challenge requesting 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/notifications/100"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Triggering or retrieving notifications via a single paid API call","Agent-driven workflows that need a notification service without account setup","Programmatic access to notification data with per-request USDC micropayments"],"bestFor":["Developers wanting zero-signup, pay-as-you-go notification access","AI agents that can settle x402 payments on Base in USDC","Use cases requiring low-friction, keyless API access"],"notFor":["High-volume notification workloads where per-call pricing adds up quickly","Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.428Z"},"updatedAt":"2026-04-22T04:02:46.603Z"}}