{"id":"3beb1b88-b597-4af2-8384-5fbd77bb3be2","shortId":"5xAjh8","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/59` 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 pay per request with an x402 payment header.\n\nThe broader lowpaymentfee.com platform lists endpoints across several categories — data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request. However, this particular endpoint (`/api/v1/notifications/59`) is not listed on the homepage's catalog, and its exact functionality beyond the generic \"Premium API Access\" label is unclear. The path suggests it relates to notifications (possibly retrieving or triggering a specific notification resource with ID 59), but no documentation, request schema, or response schema is available to confirm this.\n\nThe endpoint is live: it returns a well-formed 402 challenge with x402 version 1, settling on Base to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the canonical Base USDC contract (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum timeout is 300 seconds. No OpenAPI spec, AI plugin manifest, or detailed documentation was found during crawling.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","notifications","post-endpoint"],"categories":["notifications","infrastructure"],"synonyms":["premium API access","notification API","x402 notification","pay-per-call API","lowpaymentfee","USDC micropayment API","Base network API"],"warnings":["No documentation or schema available for this specific endpoint","Endpoint /api/v1/notifications/59 is not listed on the provider's homepage catalog — its exact functionality is unclear","No example request or response bodies available","The /pricing, /api, and /README pages returned only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/59","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/59","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, no request/response schema, and the specific purpose of /api/v1/notifications/59 is unknown. The endpoint does not appear in the provider's own homepage catalog, making it effectively a stub 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'0.02':11,26,86,128 '000':77 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':209 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':216 '1':203 '20':76 '300':221 '402':198 '59':174 '6':82 'Base network API' 'USDC micropayment API' 'accept':71 'access':69,153 'across':112 'address':208 'advertis':96 'ai':117,226 'analyt':116 'api':50,68,90,152 'avail':184 'base':8,23,58,78,206,213 'base-network' 'beyond':148 'broader':107 'call':4,19,88 'caller':97 'canon':212 'catalog':143 'categori':114 'challeng':199 'collect':44 'confirm':186 'contract':215 'crawl':235 'data':115 'decim':83 'detail':230 'document':177,231 'endpoint':6,21,32,64,111,134,189 'equal':85 'exact':146 'financ':120 'form':197 'found':233 'function':147 'generic':150 'header':105 'homepag':141 'howev':131 'id':173 'infrastructur':123 'key':91 'label':66,154 'learn':119 'limit':94 'list':110,138 'live':191 'lowpaymentfee' 'lowpaymentfee.com':39,108 'machin':118 'manifest':228 'maximum':218 'network':59 'notif':5,20,163,170 'notification API' 'notifications' 'offer':42 'openapi':224 'part':36 'particular':133 'path':158 'pay':2,17,47,98 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':46 'payment':74,104 'per':3,12,18,27,48,87,99,129 'platform':40,109 'plugin':227 'possibl':164 'post':72 'post-endpoint' 'premium':67,151 'premium API access' 'price':126 'protocol':55 'rate':93 'relat':161 'request':13,28,49,73,100,130,178 'resourc':171 'respons':181 'retriev':165 'return':193 'schema':179,182 'second':222 'settl':51,204 'sever':113 'spec':225 'specif':63,169 'suggest':159 'timeout':219 'trigger':167 'unclear':156 'unit':79 'usdc':15,30,61,81,214 'usdc-settlement' 'use':60,210 'util':124 'version':202 'via':9,24,52 'web3':121 'well':196 'well-form':195 'x402':10,25,54,103,201 'x402 notification' 'x402-payment'","prices":[{"id":"699edae4-c2df-4072-8ced-2a2a152a9f5d","listingId":"3beb1b88-b597-4af2-8384-5fbd77bb3be2","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/59","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.942Z"}],"sources":[{"listingId":"3beb1b88-b597-4af2-8384-5fbd77bb3be2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/59","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.942Z","lastSeenAt":"2026-04-22T04:02:46.375Z"}],"details":{"listingId":"3beb1b88-b597-4af2-8384-5fbd77bb3be2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/59 \\\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/59"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/notifications/59"},{"claim":"All listed APIs 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 homepage lists endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories but does not include /api/v1/notifications/59","source_url":"https://lowpaymentfee.com"}],"useCases":["Triggering or retrieving notifications via a paid API call","Integrating pay-per-use notification delivery into agent workflows","Testing x402 payment flows with a low-cost endpoint"],"bestFor":["Agents needing a simple pay-per-call notification endpoint","Developers experimenting with x402 protocol on Base","Low-cost API access without API key management"],"notFor":["Use cases requiring detailed documentation or guaranteed SLAs","High-volume notification delivery where per-call pricing is impractical","Users who need to understand the exact notification payload before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.673Z"},"updatedAt":"2026-04-22T04:02:46.375Z"}}