{"id":"b8d25bab-7475-4118-a389-dae6f0bd0cfc","shortId":"qS6GAg","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/73`. 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 at $0.02 per request and settled in USDC on the Base network via the x402 payment protocol.\n\nThe specific endpoint probed (`/api/v1/notifications/73`) returned a valid 402 challenge confirming it is live. The challenge specifies payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts HTTP POST requests and returns `application/json`.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, documentation is extremely sparse — there is no OpenAPI spec, no request/response schema, and no explanation of what the notifications endpoint actually returns or what parameters it accepts. The crawled docs and pricing pages rendered only a \"Connect wallet\" prompt with no additional detail. Without knowing the request body format or response structure, callers will need to experiment or contact the provider.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","notifications-api","no-api-key","json-response"],"categories":["notifications","infrastructure"],"synonyms":["notification API","premium API access","x402 notification","pay-per-request API","USDC micropayment API","lowpaymentfee","Base network API"],"warnings":["No OpenAPI or schema documentation available — request body and response format are unknown","The specific purpose of /api/v1/notifications/73 is undocumented; 'Premium API Access' is a generic label","Crawled /api, /pricing, and /README pages all returned only 'Connect wallet' with no useful content","No examples or integration guides found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/73","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/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (valid 402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation of what the notifications endpoint does, and the crawled pages beyond the landing page returned only wallet-connect prompts. The listing is effectively a stub with confirmed 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'/request':16,32 '0.02':15,31,75,124 '000':113 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':135 '0x8335':118 '20':112 '2913':119 '300':138 '402':99 '6':128 'Base network API' 'USDC micropayment API' 'accept':143,189 'access':41,161 'actual':183 'addit':204 'address':134 'advertis':152 'ai/ml':65 'analyt':64 'api':40,60,154 'application/json':149 'base':8,24,84,114,121 'base-network' 'bodi':210 'broader':51 'call':4,20,59 'caller':215 'challeng':100,106 'confirm':101 'connect':199 'contact':221 'crawl':191 'data':63,68 'decim':129 'detail':205 'doc':192 'document':163 'dozen':54 'endpoint':6,22,34,61,93,142,182 'equal':123 'experi':219 'explan':177 'extrem':165 'finance/web3':67 'format':211 'given':125 'howev':162 'http':144 'infer':66 'infrastructur':70 'instant':160 'json-response' 'key':155 'know':207 'limit':158 'live':104 'lowpaymentfee' 'lowpaymentfee.com':36 'made':132 'need':217 'network':85 'no-api-key' 'notif':5,21,42,181 'notification API' 'notifications-api' 'offer':53 'openapi':170 'page':195 'paramet':187 'part':48 'pay':2,18,57 'pay-per-cal':1,17,56 'pay-per-call' 'pay-per-request API' 'payment':89,108,130 'per':3,19,58,76 'platform':52,151 'post':145 'premium':39 'premium API access' 'price':73,194 'probe':94 'prompt':201 'protocol':90 'provid':37,223 'rate':157 'render':196 'request':77,146,209 'request/response':173 'resourc':43 'respons':213 'return':96,148,184 'schema':174 'second':139 'settl':11,27,79 'span':62 'spars':166 'spec':171 'specif':92 'specifi':107 'structur':214 'timeout':140 'unit':115 'usdc':13,29,81,117,126 'usdc-settlement' 'util':71 'valid':98 'via':9,25,86 'wallet':200 'without':206 'x402':10,26,88 'x402 notification' 'x402-payment'","prices":[{"id":"7275f7dc-8a55-45c5-81d6-80998000b20b","listingId":"b8d25bab-7475-4118-a389-dae6f0bd0cfc","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/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.030Z"}],"sources":[{"listingId":"b8d25bab-7475-4118-a389-dae6f0bd0cfc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/73","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.030Z","lastSeenAt":"2026-04-22T04:02:46.477Z"}],"details":{"listingId":"b8d25bab-7475-4118-a389-dae6f0bd0cfc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/73 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge specifying USDC on Base, maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/notifications/73"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/notifications/73"}],"useCases":["Sending or retrieving notifications via a pay-per-call model without API key management","Integrating low-cost notification triggers into agent workflows settled on-chain","Testing x402 payment protocol integrations with a live, inexpensive endpoint"],"bestFor":["Developers exploring x402 protocol payment flows","Agents needing simple pay-per-call notification endpoints","Projects wanting no-signup, no-rate-limit API access on Base"],"notFor":["Production notification systems requiring documented request/response contracts","Use cases needing guaranteed SLAs or support, since documentation is minimal","High-volume notification pipelines where $0.02/call adds up quickly"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.557Z"},"updatedAt":"2026-04-22T04:02:46.477Z"}}