{"id":"665f358b-74ec-4a7d-9611-c63004562ab7","shortId":"eBay3k","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/3` is part of the lowpaymentfee.com platform, which offers a suite of pay-per-request APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints use the x402 protocol for payment, settling in USDC on the Base network. The specific endpoint probed here is labeled \"Premium API Access\" and costs $0.02 per request (20,000 base units of USDC with 6 decimals).\n\nThe platform advertises a simple model: no API keys, no rate limits, no commitments — just attach an x402 payment header to each call. The endpoint accepts HTTP POST requests and returns `application/json`. However, there is no public OpenAPI schema, no documentation beyond the landing page listing, and no example request/response payloads available. The exact functionality of the `/notifications/3` endpoint is unclear — the name suggests it retrieves or triggers a notification resource, but no further detail is provided in the crawled material.\n\nThe broader lowpaymentfee.com platform lists 16 endpoints across four categories (Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure), all priced at $0.02 per request. The x402 challenge was successfully captured, confirming the endpoint is live and accepting payment challenges on Base mainnet with USDC (contract `0x8335...2913`).","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","notifications","json-response","http-post"],"categories":["notifications","infrastructure"],"synonyms":["premium API","notification API","x402 notification","pay-per-call API","lowpaymentfee","Base USDC API","micropayment API"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior must be discovered empirically","The exact purpose of /api/v1/notifications/3 is undocumented; 'Premium API Access' is a generic label","No example request or response payloads are available from crawled material","The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/3","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/3","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/request in USDC on Base), but there is no OpenAPI schema, no documentation of request/response formats, and no explanation of what the /notifications/3 endpoint actually does. The listing is essentially a stub with confirmed 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'/notifications/3':156 '0.02':11,26,87,201 '000':91 '0x8335':225 '16':185 '20':90 '2913':226 '6':97 'Base USDC API' 'accept':124,216 'access':84 'across':187 'advertis':101 'ai':192 'ai/ml':54 'analyt':53,191 'api':50,83,106 'application/json':130 'attach':114 'avail':150 'base':8,23,73,92,220 'base-network' 'beyond':140 'broader':181 'call':4,19,121 'captur':209 'categori':189 'challeng':206,218 'commit':112 'confirm':210 'contract':224 'cost':86 'crawl':178 'data':52,190 'decim':98 'detail':173 'document':139 'endpoint':6,21,32,61,77,123,157,186,212 'exact':152 'exampl':147 'financ':195 'finance/web3':56 'four':188 'function':153 'header':118 'howev':131 'http':125 'http-post' 'infer':55 'infrastructur':58,197 'json-response' 'key':107 'label':81 'land':142 'learn':194 'limit':110 'list':144,184 'live':214 'lowpaymentfee' 'lowpaymentfee.com':39,182 'machin':193 'mainnet':221 'materi':179 'micropayment API' 'model':104 'name':161 'network':74 'notif':5,20,168 'notification API' 'notifications' 'offer':42 'openapi':136 'page':143 'part':36 'pay':2,17,47 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':46 'payload':149 'payment':67,117,217 'per':3,12,18,27,48,88,202 'platform':40,100,183 'post':126 'premium':82 'premium API' 'price':199 'probe':78 'protocol':65 'provid':175 'public':135 'rate':109 'request':13,28,49,89,127,203 'request/response':148 'resourc':169 'retriev':164 'return':129 'schema':137 'settl':68 'simpl':103 'span':51 'specif':76 'success':208 'suggest':162 'suit':44 'trigger':166 'unclear':159 'unit':93 'usdc':15,30,70,95,223 'usdc-settlement' 'use':62 'util':59 'via':9,24 'web3':196 'x402':10,25,64,116,205 'x402 notification' 'x402-payment'","prices":[{"id":"9dfc6eef-251a-41ad-af13-4be4deebd013","listingId":"665f358b-74ec-4a7d-9611-c63004562ab7","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/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:29.020Z"}],"sources":[{"listingId":"665f358b-74ec-4a7d-9611-c63004562ab7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/3","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:29.020Z","lastSeenAt":"2026-04-22T02:32:10.541Z"}],"details":{"listingId":"665f358b-74ec-4a7d-9611-c63004562ab7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/3 \\\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 network","source_url":"https://lowpaymentfee.com/api/v1/notifications/3"},{"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 16 endpoints 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/3"}],"useCases":["Triggering or retrieving notifications via a pay-per-call model without API key management","Integrating low-cost notification services into agent workflows that settle payments on Base","Testing x402 protocol integrations with a live, inexpensive endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","Agents needing simple pay-per-request notification access","Projects wanting no-signup, no-API-key access to utility endpoints"],"notFor":["Users needing well-documented APIs with full OpenAPI specs and example payloads","High-volume notification use cases where per-request pricing adds up quickly","Anyone requiring detailed notification customization or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.796Z"},"updatedAt":"2026-04-22T02:32:10.541Z"}}