{"id":"7ba9b033-dc6b-4d26-98a2-c21165bae1d8","shortId":"GfDuAE","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 `/api/v1/notifications/55` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 protocol on the Base network, accepting USDC payments with no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint probed (`/api/v1/notifications/55`) is labeled \"Premium API Access\" and costs $0.02 per request (20,000 base units of USDC with 6 decimals). It accepts POST requests and returns `application/json`. Payment is made via the x402 exact scheme to the specified wallet address on Base. The x402 challenge was successfully captured, confirming the endpoint is live.\n\nThe broader platform advertises 16+ endpoints across categories including metrics, reports, data export, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 per request price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads are available for any of these endpoints, making it difficult to know exactly what parameters to send or what data structures to expect back.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","notifications","json-api","no-api-key","no-rate-limit"],"categories":["notifications","infrastructure"],"synonyms":["notification API","premium API access","x402 notification","pay-per-call API","lowpaymentfee","Base USDC API","micropayment API"],"warnings":["No OpenAPI or schema documentation available for any endpoint on this platform","The specific function of /api/v1/notifications/55 is undocumented — 'Premium API Access' is a generic label","No example request or response payloads are available; input parameters are unknown","The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content","The endpoint path includes a numeric ID (55) with no explanation of what it references"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/55","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/55","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI schema, no documentation beyond a landing page listing, no example requests or responses, and the purpose of the 'notifications/55' endpoint is entirely unclear. The listing is effectively a 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'/request':16,32 '0.02':15,31,99,180 '000':103 '16':148 '20':102 '6':109 'Base USDC API' 'accept':73,112 'access':96 'across':150 'address':130 'advertis':147 'ai/ml':56 'analysi':158 'analyt':55 'api':52,78,95 'application/json':117 'avail':196 'back':218 'base':8,24,71,104,132 'broader':145 'call':4,20 'captur':138 'categori':151 'challeng':135 'classif':161 'collect':46 'confirm':139 'convers':173 'cost':98 'crypto':59 'data':54,155,214 'decim':110 'detail':189 'difficult':204 'document':190 'embed':162 'endpoint':6,22,34,64,89,141,149,201 'estim':170 'exact':124,207 'exampl':192 'exchang':165 'expect':217 'export':156 'feed':164 'financ':58 'gas':169 'generat':175 'geocod':171 'howev':185 'includ':152 'infer':57 'json-api' 'key':79 'know':206 'label':93 'limit':82 'live':143 'lowpaymentfee' 'lowpaymentfee.com':41 'made':120 'make':202 'metric':153 'micropayment API' 'network':72 'no-api-key' 'no-rate-limit' 'notif':5,21 'notification API' 'notifications' 'offer':44 'openapi':187 'paramet':209 'part':38 'pay':2,18,49 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':48 'payload':194 'payment':75,118 'per':3,19,50,100,181 'platform':42,146 'point':184 'post':113 'premium':94 'premium API access' 'price':163,183 'probe':90 'protocol':68 'quot':168 'rate':81,166 'report':154 'request':51,101,114,182 'request/response':193 'requir':86 'return':116 'schema':188 'scheme':125 'send':211 'sentiment':157 'servic':62 'settl':11,27 'span':53 'specif':88 'specifi':128 'structur':215 'subscript':85 'success':137 'summar':160 'text':159 'token':167 'unit':105 'usdc':13,29,74,107 'usdc-base' 'use':65 'util':61 'valid':172 'via':9,25,121 'wallet':129 'x402':10,26,67,123,134 'x402 notification' 'x402-payment'","prices":[{"id":"426f8aca-780c-472f-b769-8bfb20af34db","listingId":"7ba9b033-dc6b-4d26-98a2-c21165bae1d8","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/55","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:29.269Z"}],"sources":[{"listingId":"7ba9b033-dc6b-4d26-98a2-c21165bae1d8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/55","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:29.269Z","lastSeenAt":"2026-04-22T02:32:10.896Z"}],"details":{"listingId":"7ba9b033-dc6b-4d26-98a2-c21165bae1d8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/55 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/notifications/55"},{"claim":"All endpoints on the platform 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 platform offers 16+ endpoints across data/analytics, AI/ML, finance/web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/notifications/55"}],"useCases":["Sending or retrieving notifications via a pay-per-call model without needing API keys","Integrating low-cost notification functionality into agent workflows on Base","Testing x402 protocol integrations with a cheap, live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-use API access on Base","Low-volume notification use cases where $0.02/call is acceptable"],"notFor":["High-volume notification needs where per-call costs would accumulate quickly","Users who need detailed API documentation or guaranteed SLAs","Anyone requiring non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.343Z"},"updatedAt":"2026-04-22T02:32:10.896Z"}}