{"id":"be3d7c6d-c3c1-40d2-a265-547dba8e21df","shortId":"UMzvWU","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 lowpaymentfee.com platform, which hosts a catalog of pay-per-request APIs spanning 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/209` is labeled \"Premium API Access\" in the x402 challenge but its exact functionality is not documented beyond that label. The x402 challenge confirms it accepts POST requests, returns application/json, and requires a maximum payment of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to the address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The endpoint is live and returns a proper 402 challenge.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point. However, documentation pages (docs, pricing, README) all resolve to a minimal \"Connect wallet\" page with no further technical detail, so the actual request/response schemas for this specific endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","pay-per-call API","USDC API access","Base network API","micropayment API"],"warnings":["The exact functionality of /api/v1/payments/209 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation pages (/docs, /pricing, /README, /api) return only 'Connect wallet' with no technical content.","No request or response schema is available — callers cannot know what to send or what to expect back.","This endpoint path (/api/v1/payments/209) does not appear in the platform's own listed API catalog, raising questions about its purpose."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/209","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/209","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 402 challenge, confirming pricing and payment details. However, the actual functionality behind \"Premium API Access\" is entirely undocumented — no request schema, no response schema, no examples, and all documentation pages are empty stubs showing only \"Connect wallet\". The endpoint's purpose cannot be determined from available 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'/request':13,28 '0.02':12,27,81,147,194 '000':142 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':157 '20':141 '402':166 '6':152 'Base network API' 'USDC API access' 'accept':130 'access':7,22,38,110 'actual':218 'address':156 'advertis':171 'ai':68 'analysi':175 'analyt':67 'api':6,21,37,64,93,109 'application/json':134 'base':9,24,89,143 'base-network' 'beyond':122 'broader':169 'call':4,19 'catalog':58 'challeng':114,127,167 'classif':178 'commit':100 'confirm':128 'connect':208 'convers':186 'data':66,188 'decim':153 'detail':215 'doc':200 'document':121,198 'embed':179 'endpoint':32,49,77,104,159,172,224 'exact':117 'exchang':182 'export':189 'feed':181 'financ':71 'function':118 'geocod':184 'host':56 'howev':197 'infrastructur':74 'json-response' 'key':94 'label':107,124 'learn':70 'limit':97 'live':161 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'mani':48 'maximum':138 'micropayment API' 'minim':207 'network':90 'no-api-key' 'offer':50 'one':46 'page':199,210 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payment':42,139 'per':3,18,62,82 'platform':54,170 'point':196 'post':131 'post-method' 'premium':5,20,36,108 'price':79,180,195,201 'proper':165 'protocol':43 'provid':35 'rate':96,183 'readm':202 'remain':225 'request':63,83,132 'request/response':219 'requir':101,136 'resolv':204 'return':133,163 'schema':220 'sentiment':174 'settl':84 'sinc':149 'span':65 'specif':103,223 'summar':177 'technic':214 'text':176 'unit':144 'unknown':226 'usd':148 'usdc':15,30,86,146,150 'usdc-settlement' 'use':151 'util':75 'valid':185 'via':10,25,39 'wallet':209 'web3':72 'x402':11,26,41,113,126 'x402 premium API' 'x402-payment'","prices":[{"id":"aca70974-c820-4bd7-916c-1041c1628de4","listingId":"be3d7c6d-c3c1-40d2-a265-547dba8e21df","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/209","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:49.803Z"}],"sources":[{"listingId":"be3d7c6d-c3c1-40d2-a265-547dba8e21df","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/209","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:49.803Z","lastSeenAt":"2026-04-23T16:07:16.439Z"}],"details":{"listingId":"be3d7c6d-c3c1-40d2-a265-547dba8e21df","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/209 \\\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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/209"},{"claim":"All platform APIs are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/209"},{"claim":"Documentation pages resolve to minimal 'Connect wallet' content with no technical detail","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to platform services"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or request/response schemas before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.827Z"},"updatedAt":"2026-04-23T16:07:16.439Z"}}