{"id":"2c8855a5-5333-4a4b-849d-7edd39739dea","shortId":"BfE4Yh","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, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/payments/132` returns a valid x402 challenge (HTTP 402) requesting payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to the address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nHowever, the specific functionality behind this particular endpoint path (`/payments/132`) is not documented beyond the generic label \"Premium API Access.\" The provider's landing page lists numerous other endpoints (metrics, reports, sentiment analysis, summarization, classification, embeddings, price feeds, exchange rates, geocoding, etc.) but does not describe `/api/v1/payments/132` specifically. Documentation pages (`/docs`, `/pricing`, `/README`) returned only a \"Connect wallet\" prompt with no substantive content. Without further documentation, it is unclear what data or service this specific endpoint returns upon successful payment.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The specific functionality of /api/v1/payments/132 is undocumented — the label 'Premium API Access' is generic and uninformative.","All documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no substantive content.","No OpenAPI spec, request schema, or response schema is available.","It is unclear how this endpoint relates to the other documented endpoints on the provider's landing page."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/132","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/132","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 documentation explaining what this specific endpoint actually does or returns upon successful payment. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt. The listing is essentially a stub with confirmed liveness but unknown 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'/docs':195 '/payments/132':154 '/pricing':196 '/readme':197 '/request':13,28 '0.02':12,27,73,114 '000':109 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':124 '20':108 '300':134 '402':102 '6':119 'Base network API' 'USDC micropayment endpoint' 'accept':139 'access':7,22,38,164 'address':123 'ai':60 'analysi':177 'analyt':59 'api':6,21,37,85,163 'application/json':144 'base':9,24,81,110,126 'behind':149 'beyond':158 'call':4,19 'categori':56 'challeng':100 'classif':179 'commit':90 'connect':201 'content':207 'crypto-paid API' 'data':58,215 'decim':120 'describ':190 'document':157,193,210 'embed':180 'endpoint':32,49,69,94,138,152,173,220 'etc':186 'exact':131 'exchang':183 'feed':182 'financ':63 'function':148 'generic':160 'geocod':185 'howev':145 'http':101 'includ':57 'infrastructur':66 'json-response' 'key':86 'label':161 'land':168 'learn':62 'limit':88 'list':170 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':61 'mani':48 'metric':174 'network':82 'no-api-key' 'numer':171 'offer':50 'one':46 'page':169,194 'particular':151 'path':153 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':76 'payment':42,104,128,224 'per':3,18,74 'post':140 'post-method' 'premium':5,20,36,162 'premium API access' 'price':71,181 'prompt':203 'protocol':43 'provid':35,53,166 'rate':87,184 'report':175 'request':75,103,141 'requir':91 'return':96,143,198,221 'scheme':129 'second':135 'sentiment':176 'servic':217 'sinc':116 'span':55 'specif':93,147,192,219 'substant':206 'success':223 'summar':178 'timeout':136 'unclear':213 'unit':111 'upon':222 'usd':115 'usdc':15,30,78,113,117 'usdc-base' 'use':118 'util':67 'valid':98 'via':10,25,39 'wallet':202 'web3':64 'without':208 'x402':11,26,41,99 'x402 API' 'x402-payment'","prices":[{"id":"481404c4-f63d-473f-93a6-6cd3b8832a58","listingId":"2c8855a5-5333-4a4b-849d-7edd39739dea","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/132","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:20.860Z"}],"sources":[{"listingId":"2c8855a5-5333-4a4b-849d-7edd39739dea","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/132","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:20.860Z","lastSeenAt":"2026-04-23T19:01:17.071Z"}],"details":{"listingId":"2c8855a5-5333-4a4b-849d-7edd39739dea","quickStartSnippet":"# 1. Send a POST to discover the x402 payment challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/132\n# Returns 402 with X-Payment challenge in JSON body.\n# 2. Construct and attach an X-PAYMENT header with a valid\n#    USDC payment proof on Base, then re-send the POST.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/payments/132","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The provider lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories, all priced at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network.","source_url":"https://lowpaymentfee.com/api/v1/payments/132"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/payments/132"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a paid API endpoint without traditional API key registration","Agent-driven workflows that need to pay per call using USDC on Base","Testing x402 payment protocol integrations"],"bestFor":["Developers or agents wanting keyless, pay-per-use API access","x402 protocol experimentation on Base","Low-cost per-request API consumption ($0.02/call)"],"notFor":["Users who need detailed documentation about what the endpoint actually returns","High-volume use cases where per-request crypto payments add latency or cost overhead","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:10.143Z"},"updatedAt":"2026-04-23T19:01:17.071Z"}}