{"id":"cd493ad6-a6bd-4eaf-bd49-4280c2bc383c","shortId":"FQvFgE","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 `/api/v1/notifications/28` is part of the lowpaymentfee.com platform, which offers a broad suite of pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities. All endpoints use the x402 payment protocol, settling in USDC on the Base network at a flat rate of $0.02 per request. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint probed (`/api/v1/notifications/28`) is listed under the title \"Premium API Access\" but its exact functionality is not documented beyond that label. The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export, all at the same $0.02 price point. The x402 challenge confirms the endpoint is live, accepts POST requests, requires payment of up to 20,000 base units of USDC (i.e., $0.02 given 6 decimals), and settles to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base.\n\nDocumentation is minimal — the site's /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawl. The endpoint's actual input parameters and response format are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","notification-api"],"categories":["notifications","infrastructure"],"synonyms":["premium API access","notification endpoint","pay-per-call API","x402 API","USDC micropayment API","lowpaymentfee","Base network API"],"warnings":["No OpenAPI spec or request/response schema available","Endpoint purpose ('Premium API Access') is vague — actual notification behavior undocumented","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no content","Input parameters and response format are completely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/28","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/28","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 OpenAPI spec, no request/response schema, no documentation beyond a generic title, and no examples. The actual functionality of '/api/v1/notifications/28' is unclear. Score reflects a near-stub level of available 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'/api/v1/notifications/28':36,111 '/pricing':200 '/readme':202 '/request':16,32 '0.02':15,31,84,156,182 '000':176 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':190 '20':175 '6':184 'Base network API' 'USDC micropayment API' 'accept':167 'access':119 'actual':234 'address':189 'advertis':133 'ai/ml':57 'analysi':137 'analyt':56 'api':53,88,118 'attach':99 'avail':227 'base':8,24,77,177,192 'base-network' 'beyond':127 'broad':46 'broader':131 'call':4,20 'caller':97 'challeng':161 'classif':140 'commit':94 'confirm':162 'connect':208 'content':214 'convers':148 'crawl':230 'data':55,61,150 'decim':185 'document':126,193 'embed':141 'endpoint':6,22,34,66,109,134,164,232 'exact':122 'exampl':226 'exchang':144 'export':151 'feed':143 'financ':59 'flat':81 'format':239 'function':123 'geocod':146 'given':183 'header':103 'i.e':181 'infer':58 'infrastructur':63 'input':235 'key':89 'label':129 'limit':91 'list':113 'live':166 'lowpaymentfee' 'lowpaymentfee.com':41 'minim':195 'network':78 'no-api-key' 'notif':5,21 'notification endpoint' 'notification-api' 'offer':44 'openapi':218 'page':203 'paramet':236 'part':38 'pay':2,18,50 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':49 'payment':70,102,171 'per':3,19,51,85 'platform':42,132 'point':158 'post':168 'premium':117 'premium API access' 'price':142,157 'probe':110 'prompt':210 'protocol':71 'rate':82,90,145 'request':52,86,106,169 'request/response':221 'requir':96,170 'resolv':205 'respons':238 'schema':222 'sentiment':136 'settl':11,27,72,187 'simpli':98 'site':197 'span':54 'spec':219 'specif':108 'suit':47 'summar':139 'text':138 'titl':116 'unit':178 'unknown':241 'upfront':93 'usag':225 'usdc':13,29,74,180 'usdc-settlement' 'use':67 'util':64 'valid':147 'via':9,25 'wallet':209 'web3':60 'x402':10,26,69,101,160 'x402 API' 'x402-payment'","prices":[{"id":"08b43add-6dea-47b4-83a6-8ce71a7eceb7","listingId":"cd493ad6-a6bd-4eaf-bd49-4280c2bc383c","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/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.169Z"}],"sources":[{"listingId":"cd493ad6-a6bd-4eaf-bd49-4280c2bc383c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/28","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.169Z","lastSeenAt":"2026-04-22T04:02:46.647Z"}],"details":{"listingId":"cd493ad6-a6bd-4eaf-bd49-4280c2bc383c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/28 \\\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 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/notifications/28"},{"claim":"All endpoints 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 offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/notifications/28"}],"useCases":["Triggering or retrieving notifications via a single paid API call","Agent-driven workflows that need a low-friction, keyless notification service","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that need keyless, per-call API access on Base","Low-volume consumers who prefer pay-as-you-go pricing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume notification pipelines where $0.02/call adds up quickly","Anyone requiring non-crypto payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.374Z"},"updatedAt":"2026-04-22T04:02:46.647Z"}}