{"id":"26c11689-921a-4f85-ab3e-45a9a83d6cc6","shortId":"8fRvCW","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 collection 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/109` is labeled \"Premium API Access\" but the crawled documentation does not clarify what this particular resource returns or what input it expects beyond an HTTP POST. The x402 challenge confirms the endpoint is live, accepts USDC (contract 0x8335…2913) on Base, and requires a maximum payment of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises endpoints for 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 any of these endpoints remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post"],"categories":["api-gateway","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","pay-per-call API","USDC micropayment API","Base network API"],"warnings":["The specific functionality of /api/v1/payments/109 ('Premium API Access') is undocumented — it is unclear what data or service it provides.","All documentation pages (docs, pricing, README) returned only 'Connect wallet' with no usable content.","No request or response schema is available for any endpoint on this platform.","The platform lists many endpoints (AI, finance, utilities) but none have documented schemas or example payloads."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/109","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/109","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 on what this specific endpoint does, what inputs it accepts, or what it returns. The docs, pricing, and README pages all render only a 'Connect wallet' prompt with no technical content. The listing is effectively a 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'/request':13,28 '0.02':12,27,81,158,205 '000':154 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':170 '0x8335':143 '20':153 '2913':144 '300':173 '6':162 'Base network API' 'USDC micropayment API' 'accept':140 'access':7,22,38,110 'actual':227 'address':169 'advertis':179 'ai':68 'analysi':183 'analyt':67 'api':6,21,37,64,93,109 'base':9,24,89,146,155 'beyond':128 'broader':177 'call':4,19 'challeng':134 'clarifi':117 'classif':186 'collect':58 'commit':100 'confirm':135 'connect':217 'contract':142 'convers':198 'crawl':113 'data':66 'decim':163 'detail':224 'direct':167 'doc':211 'document':114,209 'embed':187 'endpoint':32,49,77,104,137,180,234 'estim':195 'exchang':190 'expect':127 'feed':189 'financ':71 'gas':194 'generat':200 'geocod':196 'given':159 'host':56 'howev':208 'http':130 'http-post' 'i.e':157 'infrastructur':74 'input':125 'key':94 'label':107 'learn':70 'limit':97 'live':139 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'mani':48 'maximum':150 'network':90 'no-api-key' 'offer':50 'one':46 'page':210 'particular':120 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payment':42,151,165 'per':3,18,62,82 'platform':54,178 'point':207 'post':131 'premium':5,20,36,108 'price':79,188,206,212 'prompt':219 'protocol':43 'provid':35 'quot':193 'rate':96,191 'readm':213 'remain':235 'request':63,83 'request/response':228 'requir':101,148 'resourc':121 'return':122,214 'schema':229 'second':174 'sentiment':182 'settl':84 'span':65 'specif':103 'summar':185 'technic':223 'text':184 'timeout':175 'token':192 'unit':156 'unknown':236 'usdc':15,30,86,141,160 'usdc-base' 'util':75 'valid':197 'via':10,25,39 'wallet':218 'web3':72 'x402':11,26,41,133 'x402 premium API' 'x402-payment'","prices":[{"id":"d64ddadd-14b0-483c-a1e0-2080b4b064bb","listingId":"26c11689-921a-4f85-ab3e-45a9a83d6cc6","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/109","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:28.758Z"}],"sources":[{"listingId":"26c11689-921a-4f85-ab3e-45a9a83d6cc6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/109","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:28.758Z","lastSeenAt":"2026-04-23T17:31:47.460Z"}],"details":{"listingId":"26c11689-921a-4f85-ab3e-45a9a83d6cc6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/109 \\\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 HTTP 402 with x402 challenge, confirming it is live on Base with USDC","source_url":"https://lowpaymentfee.com/api/v1/payments/109"},{"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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/109"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 pay-per-call patterns","Agents that need keyless, on-demand API access settled in USDC","Low-commitment, no-subscription API consumption"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume use cases where per-request crypto settlement overhead matters","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.777Z"},"updatedAt":"2026-04-23T17:31:47.460Z"}}