{"id":"234c3cba-ae20-4120-b066-67236f5db621","shortId":"pzZSmp","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the provider, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/payments/51` is labeled \"Premium API Access\" but the provider does not document what this particular route returns. The x402 challenge confirms it is live, accepts POST requests, and charges a maximum of 20,000 base units of USDC (0.02 USD) per call. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, with a 300-second timeout.\n\nThe provider's landing page lists 16 different API endpoints across four categories, but documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available. The actual functionality behind this specific `/payments/51` route is unclear — it may be a generic demonstration endpoint or a specific premium service. Agents should be aware that the lack of documentation makes it difficult to predict the response format or required request body.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-method"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee"],"warnings":["No documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or request/response schema provided","The specific functionality of /api/v1/payments/51 ('Premium API Access') is undocumented and unclear","No example responses available to verify what the endpoint returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/51","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/payments/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what '/api/v1/payments/51' actually returns. The docs, pricing, API, and README pages all render only 'Connect wallet' with no content. This is effectively a stub 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'/api/v1/payments/51':97 '/docs':168 '/payments/51':203 '/pricing':169 '/readme':171 '/request':13,28 '0.02':12,27,73,135 '000':130 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':144 '16':158 '20':129 '300':149 'Base network API' 'USDC micropayment endpoint' 'accept':121 'access':7,22,38,102 'across':162 'actual':198 'address':143 'agent':219 'ai':60 'analyt':59 'api':6,21,37,85,101,160 'avail':196 'awar':222 'base':9,24,81,131,146 'behind':200 'bodi':239 'call':4,19,138 'categori':56,164 'challeng':116 'charg':125 'commit':92 'confirm':117 'connect':176 'data':58 'demonstr':212 'detail':183 'differ':159 'difficult':230 'document':108,166,227 'endpoint':32,49,69,96,161,213 'exampl':195 'financ':63 'format':235 'four':163 'function':199 'generic':211 'includ':57 'infrastructur':66 'key':86 'label':99 'lack':225 'land':155 'learn':62 'limit':89 'list':157 'live':120 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':61 'made':141 'make':228 'mani':48 'maximum':127 'may':208 'network':82 'no-api-key' 'offer':50 'one':46 'openapi':187 'page':156,167 'particular':111 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,139 'per':3,18,74,137 'post':122 'post-method' 'predict':232 'premium':5,20,36,100,217 'price':71 'prompt':178 'protocol':43 'provid':35,53,105,153 'rate':88 'render':173 'request':75,123,238 'request/response':190 'requir':93,237 'respons':234 'return':113 'rout':112,204 'schema':191 'second':150 'servic':218 'settl':76 'span':55 'spec':188 'specif':95,202,216 'technic':182 'timeout':151 'unclear':206 'unit':132 'usag':194 'usd':136 'usdc':15,30,78,134 'usdc-base' 'util':67 'via':10,25,39 'wallet':177 'web3':64 'x402':11,26,41,115 'x402 API' 'x402-payment'","prices":[{"id":"b7a90852-3187-4657-8417-820be9134b28","listingId":"234c3cba-ae20-4120-b066-67236f5db621","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/payments/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:49.540Z"}],"sources":[{"listingId":"234c3cba-ae20-4120-b066-67236f5db621","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/51","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:49.540Z","lastSeenAt":"2026-04-22T09:01:19.755Z"}],"details":{"listingId":"234c3cba-ae20-4120-b066-67236f5db621","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/51 \\\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":"Endpoint returns 402 with x402 challenge, confirming it is live on Base network with USDC payment","source_url":"https://lowpaymentfee.com/api/v1/payments/51"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Provider offers 16 endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/payments/51"}],"useCases":["Testing x402 payment protocol integrations","Demonstrating pay-per-request API patterns on Base","Accessing premium API content without API key registration"],"bestFor":["Developers experimenting with x402 payment flows","Agents that can settle USDC payments on Base","Users who want keyless, pay-as-you-go API access"],"notFor":["Production workloads requiring documented request/response schemas","Users who need free or subscription-based API access","Anyone needing detailed API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.925Z"},"updatedAt":"2026-04-22T09:01:19.755Z"}}