{"id":"2e5db639-440c-46e1-adec-1f7eef883e5c","shortId":"fRD7uG","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02 per 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/charges/51` is listed as \"Premium API Access\" but the crawled material does not clarify what data or functionality this particular charge ID returns — it does not appear in the provider's public API listing. The x402 challenge confirms the endpoint is live, accepting POST requests, settling in USDC (contract 0x8335…) on Base to address 0x1A2B…, with a max amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The challenge specifies a 300-second timeout and returns application/json.\n\nThe provider's landing page advertises a broad suite of APIs (metrics, reports, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, 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 substantive content, so there is no schema documentation, example requests, or example responses available for any endpoint.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","crypto-paid API"],"warnings":["The specific endpoint /api/v1/charges/51 ('Premium API Access') does not appear in the provider's public API listing — its actual functionality is unknown.","All documentation pages (/docs, /pricing, /README, /api) returned only a 'Connect wallet' prompt with no substantive content.","No request or response schema is available; integrators cannot know what to send or what to expect back.","The provider lists many diverse endpoints (AI, finance, analytics, utilities) all at $0.02 — it is unclear whether these are fully implemented or placeholders."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/51","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/charges/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the specific functionality of /api/v1/charges/51 is undefined. Docs pages all return only 'Connect wallet' with no 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'/docs':216 '/pricing':217 '/readme':218 '0.02':12,28,75,162,210 '000':158 '0x1a2b':151 '0x8335':146 '20':157 '300':172 '6':166 'Base network API' 'USDC micropayment API' 'accept':139 'access':7,23,40,103 'address':150 'advertis':183 'ai':62 'amount':155 'analysi':192 'analyt':61 'api':6,22,39,87,102,129,188 'appear':123 'application/json':177 'avail':240 'base':9,25,83,148,159 'base-network' 'broad':185 'call':4,20 'categori':58 'challeng':133,169 'charg':117 'clarifi':110 'classif':195 'commit':92 'confirm':134 'connect':222 'content':228 'contract':145 'convers':203 'crawl':106 'crypto-paid API' 'data':60,112 'decim':167 'document':214,234 'embed':196 'endpoint':34,51,71,96,136,243 'exampl':235,238 'exchang':199 'feed':198 'financ':65 'function':114 'generat':205 'geocod':201 'given':163 'howev':213 'i.e':161 'id':118 'includ':59 'infrastructur':68 'json-response' 'key':88 'land':181 'learn':64 'limit':90 'list':99,130 'live':138 'lowpaymentfee' 'lowpaymentfee.com':36 'machin':63 'mani':50 'materi':107 'max':154 'metric':189 'network':84 'no-api-key' 'offer':52 'one':48 'page':182,215 'particular':116 'pay':2,18 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request' 'payabl':78 'payment':44 'per':3,13,19,29,76 'point':212 'post':140 'premium':5,21,38,101 'price':73,197,211 'prompt':224 'protocol':45 'provid':37,55,126,179 'public':128 'rate':89,200 'report':190 'request':14,30,77,141,236 'requir':93 'respons':239 'return':119,176,219 'schema':233 'second':173 'sentiment':191 'settl':142 'span':57 'specif':95 'specifi':170 'substant':227 'suit':186 'summar':194 'text':193 'timeout':174 'unit':160 'usdc':16,32,80,144,164 'usdc-settlement' 'util':69 'valid':202 'via':10,26,41 'wallet':223 'web3':66 'x402':11,27,43,132 'x402 API' 'x402-payment'","prices":[{"id":"8f19cc5b-2966-4816-ae78-a6e8d894755f","listingId":"2e5db639-440c-46e1-adec-1f7eef883e5c","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/charges/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:19.313Z"}],"sources":[{"listingId":"2e5db639-440c-46e1-adec-1f7eef883e5c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/51","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:19.313Z","lastSeenAt":"2026-04-23T23:02:31.266Z"}],"details":{"listingId":"2e5db639-440c-46e1-adec-1f7eef883e5c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/51 \\\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 402 with x402 challenge, confirming it is live on Base with USDC settlement","source_url":"https://lowpaymentfee.com/api/v1/charges/51"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/charges/51"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to premium API functionality with per-request USDC micropayments","Agent-driven workflows that need keyless, on-demand API calls settled on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 payment protocol","Agents needing keyless pay-per-use API access","Low-volume or sporadic API consumers who want no subscriptions"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.91Z"},"updatedAt":"2026-04-23T23:02:31.266Z"}}