{"id":"2403b168-066b-43f0-a8db-d576341786b0","shortId":"mPcaft","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/60`. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data & analytics, AI/ML inference, finance & Web3, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network via the x402 protocol.\n\nThe specific `/api/v1/notifications/60` endpoint accepts POST requests and returns `application/json`. Payment is handled inline: callers attach an `X-PAYMENT` header containing a signed x402 payment 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 `0x1A2B…85F3` and the USDC contract used is the canonical Base USDC (`0x8335…2913`).\n\nBecause the endpoint path includes a numeric ID (`/60`), it likely retrieves or triggers a specific notification resource, but no further documentation, request body schema, or response examples are available from the provider. The platform's landing page confirms the pricing model and lists sibling endpoints but does not provide OpenAPI specs or detailed docs for any individual route. Treat this as a lightweight, low-friction micropayment endpoint with minimal documentation.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","notifications-api","pay-per-call","no-api-key","json-response"],"categories":["notifications","infrastructure"],"synonyms":["notification endpoint","premium API","x402 notification","micropayment API","USDC pay-per-call","lowpaymentfee","Base USDC API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The exact purpose and expected request body for /api/v1/notifications/60 are undocumented","No response examples or error codes are provided by the platform","Sibling endpoints listed on the landing page may or may not all be live"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/60","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/60","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), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /notifications/60 is unexplained. Effectively a stub 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'/api/v1/notifications/60':43,90 '0.02':11,26,73,124 '000':118 '0x1a2b':150 '0x8335':162 '20':117 '2913':163 '6':128 '85f3':151 'Base USDC API' 'USDC pay-per-call' 'accept':92 'access':39,139 'account':133 'address':148 'advertis':138 'ai/ml':63 'analyt':62 'api':38,58,131 'application/json':97 'attach':103 'avail':193 'base':8,23,82,119,160 'base-network' 'bodi':187 'broader':49 'call':4,19,57 'caller':102 'canon':159 'confirm':202 'contain':109 'contract':155 'data':61 'decim':129 'detail':217 'doc':218 'document':185,235 'dozen':52 'endpoint':6,21,32,59,91,166,209,232 'exampl':191 'financ':65 'friction':230 'gate':141 'handl':100 'header':108 'i.e':123 'id':171 'includ':168 'individu':221 'infer':64 'infrastructur':68 'inlin':101 'json-response' 'key':132 'land':200 'lightweight':227 'like':174 'limit':136 'list':207 'low':229 'low-frict':228 'lowpaymentfee' 'lowpaymentfee.com':34 'micropay':144,231 'micropayment API' 'minim':234 'model':205 'network':83 'no-api-key' 'notif':5,20,40,180 'notification endpoint' 'notifications-api' 'numer':170 'offer':51 'openapi':214 'page':201 'part':46 'path':167 'pay':2,17,55 'pay-per-cal':1,16,54 'pay-per-call' 'payment':98,107,113,146 'per':3,12,18,27,56,74 'platform':50,198 'post':93 'premium':37 'premium API' 'price':71,204 'protocol':87 'provid':35,196,213 'pure':142 'rate':135 'recipi':147 'request':13,28,75,94,186 'resourc':41,181 'respons':190 'retriev':175 'return':96 'rout':222 'schema':188 'settl':77 'sibl':208 'sign':111 'sinc':125 'span':60 'spec':215 'specif':89,179 'treat':223 'trigger':177 'unit':120 'usdc':15,30,79,122,126,154,161 'usdc-micropayment' 'use':127,156 'util':69 'via':9,24,84 'web3':66 'x':106 'x-payment':105 'x402':10,25,86,112 'x402 notification' 'x402-payment'","prices":[{"id":"157ed46f-394f-47a0-bd07-d0a4e531b455","listingId":"2403b168-066b-43f0-a8db-d576341786b0","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/60","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":"2403b168-066b-43f0-a8db-d576341786b0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/60","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.030Z","lastSeenAt":"2026-04-22T04:02:46.476Z"}],"details":{"listingId":"2403b168-066b-43f0-a8db-d576341786b0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/60 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\"","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 20000 base units (=$0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/notifications/60"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/notifications/60"}],"useCases":["Triggering or retrieving a specific notification via micropayment","Integrating pay-per-call notification delivery into agent workflows","Testing x402 micropayment flows on Base with a low-cost endpoint"],"bestFor":["Agents needing simple, keyless notification access via crypto micropayment","Developers experimenting with x402 payment protocol on Base","Low-volume, on-demand notification retrieval without subscriptions"],"notFor":["High-volume notification systems requiring bulk pricing or batching","Users who need detailed API documentation or guaranteed SLAs","Non-crypto callers who cannot produce x402 payment headers"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.591Z"},"updatedAt":"2026-04-22T04:02:46.476Z"}}