{"id":"36cd101f-cae0-45ae-a836-8732011b0cff","shortId":"zSY2Fg","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 lowpaymentfee.com provides a \"Premium API Access\" notification resource at `/api/v1/notifications/24`, payable per request using the x402 protocol. Payment is settled in USDC on the Base network at $0.02 per call (20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each POST request.\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call APIs across categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request. The specific functionality of the `/api/v1/notifications/24` endpoint is not documented beyond the label \"Premium API Access\"; it likely delivers or triggers a notification resource identified by ID 24, but the exact request/response schema is not published.\n\nThe x402 challenge was successfully captured (HTTP 402 with a valid accepts block), confirming the endpoint is live. The payment is routed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The maximum timeout for payment settlement is 300 seconds.","tags":[],"capabilities":["x402-payment","per-call-billing","usdc-base","notifications","post-endpoint","no-api-key"],"categories":["notifications","infrastructure"],"synonyms":["notification API","premium API access","pay-per-call notification","x402 notification","lowpaymentfee","USDC API payment","Base network API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The exact functionality of /api/v1/notifications/24 is undocumented — 'Premium API Access' is the only label","No example request or response bodies are published","The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/24","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/24","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documented request/response format, and the specific purpose of the /notifications/24 endpoint is unexplained. Effectively a stub 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'0.02':11,26,61,126 '000':65 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':189 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':192 '20':64 '24':156 '300':202 '402':172 '6':69 'Base network API' 'USDC API payment' 'accept':176 'access':39,144 'across':110 'address':188 'ai':115 'analyt':114 'api':38,72,109,143 'attach':83 'base':8,23,58,66,194 'beyond':139 'block':177 'broader':98 'call':4,19,63,108 'caller':81 'captur':170 'categori':111 'challeng':167 'commit':78 'confirm':178 'data':113 'decim':70 'deliv':147 'document':138 'dozen':103 'endpoint':6,21,32,93,135,180 'exact':159 'financ':118 'function':131 'header':87 'http':171 'id':155 'identifi':153 'includ':112 'infrastructur':121 'key':73 'label':141 'learn':117 'like':146 'limit':75 'live':182 'lowpaymentfee' 'lowpaymentfee.com':34,100 'machin':116 'maximum':196 'network':59 'no-api-key' 'notif':5,20,40,151 'notification API' 'notifications' 'offer':102 'part':95 'pay':2,17,106 'pay-per-cal':1,16,105 'pay-per-call notification' 'payabl':44 'payment':51,86,184,199 'per':3,12,18,27,45,62,107,127 'per-call-billing' 'platform':99 'post':90 'post-endpoint' 'premium':37,142 'premium API access' 'price':124 'protocol':50 'provid':35 'publish':164 'rate':74 'request':13,28,46,91,128 'request/response':160 'requir':80 'resourc':41,152 'rout':186 'schema':161 'second':203 'settl':53 'settlement':200 'simpli':82 'specif':130 'success':169 'timeout':197 'trigger':149 'unit':67 'upfront':77 'usdc':15,30,55,191 'usdc-base' 'use':47,190 'util':122 'valid':175 'via':9,24 'web3':119 'x402':10,25,49,85,166 'x402 notification' 'x402-payment'","prices":[{"id":"1cb6afe6-5770-4370-856c-eddfdf77d893","listingId":"36cd101f-cae0-45ae-a836-8732011b0cff","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/24","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:29.124Z"}],"sources":[{"listingId":"36cd101f-cae0-45ae-a836-8732011b0cff","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/24","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:29.124Z","lastSeenAt":"2026-04-22T02:32:10.694Z"}],"details":{"listingId":"36cd101f-cae0-45ae-a836-8732011b0cff","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/24 \\\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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/notifications/24"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/notifications/24"}],"useCases":["Triggering or retrieving a notification resource via a single paid API call","Integrating pay-per-use notification delivery into agent workflows","Testing x402 micropayment flows against a live endpoint"],"bestFor":["Agents needing simple pay-per-call notification access without API keys","Developers experimenting with x402 protocol integrations on Base","Low-volume, on-demand notification retrieval"],"notFor":["High-volume notification streaming where per-call pricing is inefficient","Users who need detailed API documentation or OpenAPI schemas before integrating","Non-crypto workflows that cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.589Z"},"updatedAt":"2026-04-22T02:32:10.694Z"}}