{"id":"2dc10695-dda5-4a47-9460-2eff238c4378","shortId":"9YaYUd","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 on the platform share a uniform pricing model of $0.02 per request, settled in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/payments/219` is labeled \"Premium API Access\" but the crawled material does not clarify what data or functionality this particular path returns — it is not listed among the provider's publicly advertised API catalog (which covers analytics, AI inference, finance, and utility endpoints). The x402 challenge confirms the endpoint is live, accepts POST requests, charges a maximum of 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals), and pays out to a specified Ethereum address on Base.\n\nBecause the docs pages, pricing page, and README all returned only a \"Connect wallet\" stub with no further documentation, there is no schema, example request/response, or detailed description available for this specific endpoint. Agents should treat this as a generic pay-per-call x402 endpoint whose actual response payload is unknown without making a paid request.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","http-post"],"categories":["api-gateway","payments"],"synonyms":["x402 api","pay per call api","micropayment api","USDC api access","lowpaymentfee","base network api","crypto pay api"],"warnings":["The endpoint path /api/v1/payments/219 is not listed in the provider's public API catalog — its actual functionality is unknown.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' stub with no usable content.","No OpenAPI spec, input schema, or output schema is available — the response payload is entirely unknown.","No examples or error handling documentation found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/219","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/219","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the specific endpoint's purpose is not described anywhere in the crawled material. Docs, pricing, and README pages all returned empty 'Connect wallet' 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'/request':13,28 '0.02':12,27,79,165 '000':159 '20':158 '6':169 'USDC api access' 'accept':151 'access':7,22,38,106 'actual':228 'address':178 'advertis':131 'agent':214 'ai':60,137 'among':126 'analyt':59,136 'api':6,21,37,91,105,132 'avail':209 'base':9,24,87,160,180 'base network api' 'base-network' 'call':4,19,224 'catalog':133 'categori':56 'challeng':145 'charg':154 'clarifi':113 'commit':96 'confirm':146 'connect':193 'cover':135 'crawl':109 'crypto pay api' 'data':58,115 'decim':170 'descript':208 'detail':207 'doc':183 'document':199 'endpoint':32,49,69,100,142,148,213,226 'ethereum':177 'exampl':204 'financ':63,139 'function':117 'generic':220 'given':166 'http-post' 'i.e':164 'includ':57 'infer':138 'infrastructur':66 'key':92 'label':103 'learn':62 'limit':94 'list':125 'live':150 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':61 'make':234 'mani':48 'materi':110 'maximum':156 'micropayment api' 'model':77 'network':88 'no-api-key' 'offer':50 'one':46 'page':184,186 'paid':236 'particular':119 'path':120 'pay':2,17,172,222 'pay per call api' 'pay-per-cal':1,16,221 'pay-per-request' 'payload':230 'payment':42 'per':3,18,80,223 'platform':72 'post':152 'premium':5,20,36,104 'price':76,185 'protocol':43 'provid':35,53,128 'public':130 'rate':93 'readm':188 'request':81,153,237 'request/response':205 'requir':97 'respons':229 'return':121,190 'schema':203 'settl':82 'share':73 'span':55 'specif':99,212 'specifi':176 'stub':195 'treat':216 'uniform':75 'unit':161 'unknown':232 'usdc':15,30,84,163,167 'usdc-settlement' 'util':67,141 'via':10,25,39 'wallet':194 'web3':64 'whose':227 'without':233 'x402':11,26,41,144,225 'x402 api' 'x402-payment'","prices":[{"id":"541fbafa-633d-4e4d-86c5-362411349ecb","listingId":"2dc10695-dda5-4a47-9460-2eff238c4378","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/219","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:53.534Z"}],"sources":[{"listingId":"2dc10695-dda5-4a47-9460-2eff238c4378","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/219","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:53.534Z","lastSeenAt":"2026-04-23T16:07:16.624Z"}],"details":{"listingId":"2dc10695-dda5-4a47-9460-2eff238c4378","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/219 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/219"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/219"},{"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 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API functionality with per-call USDC micropayments","Agent-driven workflows that need keyless, on-demand API access settled on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that can settle USDC micropayments on Base","Users who want no-commitment, no-signup API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before paying","High-volume use cases where $0.02/request adds up without bulk discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.633Z"},"updatedAt":"2026-04-23T16:07:16.624Z"}}