{"id":"d2b52a7c-8f86-4f5e-a03f-e08915e9de45","shortId":"p64dnS","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 lowpaymentfee.com provides a \"Premium API Access\" notification resource at `/api/v1/notifications/84`. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities — all priced uniformly at $0.02 per request and settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint accepts HTTP POST requests and returns `application/json` responses. Payment is handled inline: callers attach an `X-PAYMENT` header containing a signed x402 payment voucher for up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals). No API keys, accounts, or rate limits are advertised — access is gated purely by micropayment. The payment recipient address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, and the x402 challenge specifies a 300-second timeout.\n\nBecause the endpoint path includes a numeric ID (`/notifications/84`), it likely retrieves or triggers a specific notification resource, but no further documentation on request body schema, query parameters, or response fields is available. The platform's landing page lists many other endpoints (sentiment analysis, text summarization, geocoding, price feeds, etc.) all at the same $0.02 price point, suggesting a uniform micropayment gateway wrapping various backend services.","tags":[],"capabilities":["x402-payment","usdc-base-settlement","pay-per-call","notification-api","json-response","no-api-key","http-post"],"categories":["notifications","infrastructure"],"synonyms":["notification endpoint","premium API","micropayment API","x402 notification","Base USDC API","pay-per-request","lowpaymentfee"],"warnings":["No documentation available for the /api/v1/notifications/84 endpoint — purpose and schema are unknown","No OpenAPI or machine-readable schema provided","The /api, /pricing, and /README pages returned no useful content (only 'Connect wallet')","The specific notification ID (84) is hardcoded in the endpoint path with no explanation of what it represents"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/84","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no documentation on request body schema, response format, or what the notifications/84 resource actually does. No OpenAPI spec, no examples, and crawled docs pages returned only 'Connect wallet' with no 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'/notifications/84':174 '/request':16,32 '0.02':15,31,77,130,220 '000':124 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':156 '20':123 '300':163 '6':134 'Base USDC API' 'accept':95 'access':41,145 'account':139 'address':154 'advertis':144 'ai/ml':65 'analysi':209 'analyt':64 'api':40,60,137 'application/json':101 'attach':108 'avail':198 'backend':230 'base':8,24,86,125 'bodi':190 'broader':51 'call':4,20,59 'caller':107 'challeng':160 'contain':114 'data':63,69 'decim':135 'document':187 'dozen':54 'endpoint':6,22,34,61,94,168,207 'etc':215 'feed':214 'field':196 'financ':67 'gate':147 'gateway':227 'geocod':212 'handl':105 'header':113 'http':96 'http-post' 'i.e':129 'id':173 'includ':170 'infer':66 'infrastructur':71 'inlin':106 'json-response' 'key':138 'land':202 'like':176 'limit':142 'list':204 'lowpaymentfee' 'lowpaymentfee.com':36 'mani':205 'micropay':150,226 'micropayment API' 'network':87 'no-api-key' 'notif':5,21,42,182 'notification endpoint' 'notification-api' 'numer':172 'offer':53 'page':203 'paramet':193 'part':48 'path':169 'pay':2,18,57 'pay-per-cal':1,17,56 'pay-per-call' 'pay-per-request' 'payment':103,112,118,152 'per':3,19,58,78 'platform':52,200 'point':222 'post':97 'premium':39 'premium API' 'price':74,213,221 'protocol':91 'provid':37 'pure':148 'queri':192 'rate':141 'recipi':153 'request':79,98,189 'resourc':43,183 'respons':102,195 'retriev':177 'return':100 'schema':191 'second':164 'sentiment':208 'servic':231 'settl':11,27,81 'sign':116 'sinc':131 'span':62 'specif':93,181 'specifi':161 'suggest':223 'summar':211 'text':210 'timeout':165 'trigger':179 'uniform':75,225 'unit':126 'usdc':13,29,83,128,132 'usdc-base-settlement' 'use':133 'util':72 'various':229 'via':9,25,88 'voucher':119 'web3':68 'wrap':228 'x':111 'x-payment':110 'x402':10,26,90,117,159 'x402 notification' 'x402-payment'","prices":[{"id":"3cf0e415-a3df-46af-b2a1-546b36fc9e06","listingId":"d2b52a7c-8f86-4f5e-a03f-e08915e9de45","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:29.189Z"}],"sources":[{"listingId":"d2b52a7c-8f86-4f5e-a03f-e08915e9de45","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/84","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:29.189Z","lastSeenAt":"2026-04-22T02:32:10.779Z"}],"details":{"listingId":"d2b52a7c-8f86-4f5e-a03f-e08915e9de45","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/84 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-voucher>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring USDC payment of 20,000 base units ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/notifications/84"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/notifications/84"},{"claim":"The platform offers endpoints across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Triggering or retrieving a specific notification via micropayment","Integrating pay-per-call notifications into agent workflows","Testing x402 micropayment flows on Base network"],"bestFor":["Agents needing keyless, pay-per-call API access on Base","Developers experimenting with x402 micropayment protocols","Low-volume consumers who want no subscriptions or commitments"],"notFor":["Users needing detailed notification management or bulk operations (no documented schema)","Anyone requiring free or subscription-based access without crypto payments","High-throughput use cases where per-call crypto settlement adds latency"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.583Z"},"updatedAt":"2026-04-22T02:32:10.779Z"}}