{"id":"7a9037c5-565c-450e-b864-3b38144cfe10","shortId":"CFwc5D","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, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/payments/253` is labeled \"Premium API Access\" but its exact functionality is not documented beyond that title. The x402 challenge confirms the endpoint is live, accepts POST requests, and requires a payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to the address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The response MIME type is `application/json`.\n\nThe provider's landing page lists 16 endpoints across four categories but documentation pages (docs, pricing, README) all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. This makes it difficult to determine what data or functionality this specific endpoint returns. Agents should be aware that the lack of documentation means integration requires experimentation or direct contact with the provider.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-marketplace","payments"],"synonyms":["lowpaymentfee","x402 api","pay-per-call api","USDC micropayment api","base network api","premium api access"],"warnings":["No documentation available — all doc/pricing/README pages show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific functionality of /api/v1/payments/253 is undocumented and unclear","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/253","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/253","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 with clear pricing, but there is no documentation, no OpenAPI spec, no request/response schemas, and no examples. The purpose of this specific endpoint (/api/v1/payments/253) is unclear beyond the generic label 'Premium API Access'. All doc pages render only 'Connect 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'/request':13,28 '0.02':12,27,73,137 '000':132 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '16':160 '20':131 '6':142 'USDC micropayment api' 'accept':121 'access':7,22,38,102 'across':162 'address':146 'agent':211 'ai':60 'analyt':59 'api':6,21,37,85,101 'application/json':153 'avail':196 'awar':214 'base':9,24,81,133 'base network api' 'beyond':110 'call':4,19 'categori':56,164 'challeng':115 'commit':92 'confirm':116 'connect':175 'contact':226 'data':58,204 'decim':143 'detail':182 'determin':202 'difficult':200 'direct':225 'doc':168 'document':109,166,191,219 'endpoint':32,49,69,96,118,161,209 'exact':105 'exampl':194 'experiment':223 'financ':63 'four':163 'function':106,206 'includ':57 'infrastructur':66 'integr':221 'json-response' 'key':86 'label':99 'lack':217 'land':157 'learn':62 'limit':89 'list':159 'live':120 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':61 'make':198 'mani':48 'mean':220 'mime':150 'network':82 'no-api-key' 'offer':50 'one':46 'openapi':186 'page':158,167 'pay':2,17 'pay-per-cal':1,16 'pay-per-call api' 'pay-per-request' 'payabl':76 'payload':195 'payment':42,127 'per':3,18,74 'post':122 'post-method' 'premium':5,20,36,100 'premium api access' 'price':71,169 'prompt':177 'protocol':43 'provid':35,53,155,229 'rate':88 'readm':170 'render':172 'request':75,123 'request/response':189 'requir':93,125,222 'respons':149 'return':210 'schema':190 'sinc':139 'span':55 'spec':187 'specif':95,208 'technic':181 'titl':112 'type':151 'unit':134 'usd':138 'usdc':15,30,78,136,140 'usdc-base-network' 'use':141 'util':67 'via':10,25,39 'wallet':176 'web3':64 'x402':11,26,41,114 'x402 api' 'x402-payment'","prices":[{"id":"14bd6d80-61e5-4e83-9dc3-2d585f274a4d","listingId":"7a9037c5-565c-450e-b864-3b38144cfe10","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/253","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:00.229Z"}],"sources":[{"listingId":"7a9037c5-565c-450e-b864-3b38144cfe10","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/253","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:00.229Z","lastSeenAt":"2026-04-22T23:01:42.776Z"}],"details":{"listingId":"7a9037c5-565c-450e-b864-3b38144cfe10","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/253 \\\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 requiring up to 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/253"},{"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":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/253"}],"useCases":["Programmatic access to a premium API endpoint with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","Agents that can settle USDC payments on Base L2","Use cases requiring no-signup, no-rate-limit API access"],"notFor":["Users who need detailed API documentation or schemas before integrating","Applications requiring free or fiat-only payment methods","Production workloads that depend on well-documented response contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.304Z"},"updatedAt":"2026-04-22T23:01:42.776Z"}}