{"id":"bd4d26dd-881c-4bad-b0e1-4f0f3cb67b44","shortId":"tR2YJn","kind":"x402","title":"Pay-per-call premium API endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call premium API endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This x402-enabled endpoint at `/api/endpoint-79` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Each call is settled on the Base network using USDC (contract 0x8335…2913) through the x402 payment protocol. The endpoint returns JSON and accepts HTTP POST requests.\n\nThe x402 challenge advertises a maxAmountRequired of 20,000 base units. Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's published pricing of $0.02/request across all endpoints. The platform advertises no API keys, no rate limits, no minimums, and instant access — payment is the only gate.\n\nHowever, this specific endpoint (`/api/endpoint-79`) does not appear in the site's listed API catalog, which uses versioned paths like `/api/v1/...` and `/api/v2/...`. There is no documentation describing what this particular endpoint does, what input it expects, or what output it returns. The site's docs, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. Without schema details or documentation, the actual functionality of this endpoint remains unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","http-post"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["Endpoint /api/endpoint-79 is not listed in the site's published API catalog — its actual functionality is unknown","All documentation pages (docs, pricing, README) render only 'Connect wallet' with no substantive content","No input or output schema available; callers cannot know what to send or expect back","The generic name 'Premium API Access' provides no indication of the endpoint's purpose"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-79","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/endpoint-79","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what /api/endpoint-79 actually does — no input schema, no output schema, no description beyond 'Premium API Access'. The docs/pricing/README pages are empty. This is effectively a stub 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'/api/v1':169 '/api/v2':171 '/request':17,34,126 '0.02':16,33,114,125 '000':103 '0x8335':79 '20':102 '2913':80 '402 payment API' '6':109 'Base network API' 'USDC micropayment endpoint' 'accept':91 'access':143 'across':127 'actual':216 'advertis':98,132 'ai/ml':61 'analyt':60 'api':6,23,57,134,162 'appear':156 'base':9,26,74,104 'base-network' 'call':4,21,69 'catalog':163 'challeng':97 'collect':51 'connect':203 'consist':117 'content':209 'contract':78 'crypto-paid API' 'data':59,64 'decim':110 'describ':176 'detail':212 'doc':194 'document':175,214 'enabl':38 'endpoint':7,24,39,87,129,152,180,220 'expect':185 'finance/web3':63 'function':217 'gate':148 'howev':149 'http':92 'http-post' 'infer':62 'infrastructur':66 'input':183 'instant':142 'json':89 'json-response' 'key':135 'like':168 'limit':138 'list':161 'lowpaymentfee' 'lowpaymentfee.com':46 'maxamountrequir':100 'minimum':140 'network':75 'offer':49 'output':188 'page':198 'part':43 'particular':179 'path':167 'pay':2,19,54 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':53 'payment':84,144 'per':3,20,55,115 'platform':47,131 'post':93 'premium':5,22 'price':123,195 'prompt':205 'protocol':85 'publish':122 'rate':137 'readm':197 'remain':221 'render':200 'request':56,94,116 'return':88,190 'schema':211 'settl':12,29,71 'sinc':106 'site':120,159,192 'span':58 'specif':151 'substant':208 'translat':112 'unit':105 'unknown':222 'usdc':14,31,77,107 'usdc-settlement' 'use':76,108,165 'util':67 'version':166 'via':10,27 'wallet':204 'without':210 'x402':11,28,37,83,96 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"820db07b-d6e6-4ddd-86ff-cf5211513bad","listingId":"bd4d26dd-881c-4bad-b0e1-4f0f3cb67b44","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/endpoint-79","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:46.414Z"}],"sources":[{"listingId":"bd4d26dd-881c-4bad-b0e1-4f0f3cb67b44","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-79","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:46.414Z","lastSeenAt":"2026-04-22T21:30:33.248Z"}],"details":{"listingId":"bd4d26dd-881c-4bad-b0e1-4f0f3cb67b44","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-79 \\\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 x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/endpoint-79"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/endpoint-79"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Site lists APIs under /api/v1/ and /api/v2/ paths but not /api/endpoint-79","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-initiated API calls with automatic USDC micropayments on Base","Accessing premium data or services without API key registration","Programmatic pay-per-use access from autonomous agents or scripts"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation before integrating","Applications requiring guaranteed SLAs or support contracts","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.997Z"},"updatedAt":"2026-04-22T21:30:33.248Z"}}