{"id":"2b83a7cd-f097-404a-aba5-33edc9867108","shortId":"GQKhKZ","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/127` is labeled \"Premium API Access\" in the x402 challenge but its exact functionality is not documented beyond that label. The x402 challenge confirms it 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 a broad suite of APIs (metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation), all at the same $0.02 price point. However, documentation pages (`/docs`, `/pricing`, `/README`) returned only a \"Connect wallet\" prompt with no further technical detail, so the actual request/response schemas for this or any endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method"],"categories":["api-gateway","payments"],"synonyms":["premium API","lowpaymentfee","x402 API","USDC API access","Base network API","pay-per-call API","micropayment API"],"warnings":["No documentation available — /docs, /pricing, and /README all return only 'Connect wallet' with no technical content.","The exact functionality of /api/v1/payments/127 ('Premium API Access') is undocumented and unclear.","No request or response schema is provided; consumers cannot know what to send or expect back.","The provider lists many endpoints but none have publicly visible specs or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/127","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/127","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 request/response schema, and the purpose of this specific endpoint ('Premium API Access') is entirely opaque. All doc pages return only 'Connect wallet' with no 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'/docs':200 '/pricing':201 '/readme':202 '/request':13,28 '0.02':12,27,73,138,194 '000':133 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':148 '20':132 '6':143 'Base network API' 'USDC API access' 'accept':122 'access':7,22,38,100 'actual':216 'address':147 'ai':60 'analysi':172 'analyt':59 'api':6,21,37,85,99,165 'application/json':154 'base':9,24,81,134 'beyond':112 'broad':162 'call':4,19 'categori':56 'challeng':104,117 'classif':175 'commit':90 'confirm':118 'connect':206 'convers':187 'data':58,168 'decim':144 'detail':213 'document':111,198 'embed':176 'endpoint':32,49,69,94,223 'estim':184 'exact':107 'exchang':179 'export':169 'feed':178 'financ':63 'function':108 'gas':183 'generat':189 'geocod':185 'howev':197 'includ':57 'infrastructur':66 'insight':170 'json-response' 'key':86 'label':97,114 'land':158 'learn':62 'limit':88 'list':160 'live':121 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':61 'mani':48 'metric':166 'micropayment API' 'mime':151 'network':82 'offer':50 'one':46 'page':159,199 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':76 'payment':42,128 'per':3,18,74 'point':196 'post':123 'post-method' 'premium':5,20,36,98 'premium API' 'price':71,177,195 'prompt':208 'protocol':43 'provid':35,53,156 'quot':182 'rate':87,180 'report':167 'request':75,124 'request/response':217 'requir':91,126 'respons':150 'return':203 'schema':218 'sentiment':171 'sinc':140 'span':55 'specif':93 'suit':163 'summar':174 'technic':212 'text':173 'token':181 'type':152 'unit':135 'unknown':225 'usd':139 'usdc':15,30,78,137,141 'usdc-base' 'use':142 'util':67 'valid':186 'via':10,25,39 'wallet':207 'web3':64 'x402':11,26,41,103,116 'x402 API' 'x402-payment'","prices":[{"id":"4ee13da9-ca9c-4dea-86c3-ded7d653e523","listingId":"2b83a7cd-f097-404a-aba5-33edc9867108","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/127","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:26.325Z"}],"sources":[{"listingId":"2b83a7cd-f097-404a-aba5-33edc9867108","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/127","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:26.325Z","lastSeenAt":"2026-04-23T17:31:47.326Z"}],"details":{"listingId":"2b83a7cd-f097-404a-aba5-33edc9867108","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/127 \\\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":"The x402 challenge confirms the endpoint is live, accepts POST, and requires up to 20,000 base units of USDC on Base.","source_url":"https://lowpaymentfee.com/api/v1/payments/127"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, rate limits, or commitments.","source_url":"https://lowpaymentfee.com"},{"claim":"The provider lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no further content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a premium API endpoint with per-call USDC micropayments on Base","Agent-driven API consumption without API keys or subscriptions","Testing x402 payment protocol integrations"],"bestFor":["Developers exploring x402 pay-per-call patterns","Agents that need keyless, on-demand API access","Users who want to avoid subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.902Z"},"updatedAt":"2026-04-23T17:31:47.326Z"}}