{"id":"1a685251-1701-4802-8b36-a544241f6869","shortId":"k9xUZs","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. The specific resource at `/api/v1/charges/262` 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 x402 challenge confirms the endpoint is live, accepting POST requests and settling payments in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base). The `maxAmountRequired` is 20000 base units, which at 6 decimals for USDC equals $0.02. The payment scheme is \"exact,\" meaning the caller pays the precise amount per request. The response MIME type is `application/json`.\n\nHowever, the specific functionality behind `/api/v1/charges/262` is not documented — the title is simply \"Premium API Access\" with no further detail on what data or service it returns. The provider's landing page lists many other endpoints (metrics, reports, sentiment analysis, summarization, embeddings, price feeds, geocoding, etc.) but does not describe this particular charge ID. Documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what this endpoint actually does or what its request/response schemas look like, its practical utility is unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key"],"categories":["api","payment"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","crypto-paid API"],"warnings":["The specific functionality of /api/v1/charges/262 is undocumented — it is unclear what data or service this endpoint provides.","All documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no substantive content.","No request or response schema is available; callers cannot know what to send or what to expect back.","The provider lists many endpoints on its landing page but this charge ID does not correspond to any of them."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/262","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/262","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and the x402 challenge is well-formed with clear pricing ($0.02 USDC on Base). However, there is no documentation of what this specific endpoint does, no request/response schema, no examples, and all doc pages are empty. The listing title 'Premium API Access' is generic and 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'/api/v1/charges/262':48,155 '/docs':206 '/pricing':207 '/readme':209 '/request':13,28 '0.02':12,27,77,129 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':113 '20000':119 '6':124 'Base network API' 'USDC micropayment API' 'accept':104 'access':7,22,38,165 'actual':226 'ai':64 'amount':141 'analysi':189 'analyt':63 'api':6,21,37,89,164 'application/json':149 'base':9,24,85,115,120 'base-network' 'behind':154 'call':4,19 'caller':137 'categori':60 'challeng':98 'charg':202 'commit':94 'confirm':99 'connect':214 'content':220 'contract':112 'crypto-paid API' 'data':62,172 'decim':125 'describ':199 'detail':169 'document':158,204 'embed':191 'endpoint':32,53,73,101,185,225 'equal':128 'etc':195 'exact':134 'feed':193 'financ':67 'function':153 'geocod':194 'howev':150 'id':203 'includ':61 'infrastructur':70 'json-response' 'key':90 'know':222 'land':180 'learn':66 'like':234 'limit':92 'list':182 'live':103 'look':233 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':65 'mani':52,183 'maxamountrequir':117 'mean':135 'metric':186 'mime':146 'network':86 'no-api-key' 'offer':54 'one':50 'page':181,205 'particular':201 'pay':2,17,138 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':80 'payment':42,109,131 'per':3,18,78,142 'post':105 'practic':236 'precis':140 'premium':5,20,36,163 'price':75,192 'prompt':216 'protocol':43 'provid':35,57,178 'rate':91 'report':187 'request':79,106,143 'request/response':231 'requir':95 'resourc':46 'respons':145 'return':176,211 'schema':232 'scheme':132 'sentiment':188 'servic':174 'settl':108 'simpli':162 'span':59 'specif':45,152 'substant':219 'summar':190 'titl':160 'type':147 'unclear':239 'unit':121 'usdc':15,30,82,111,127 'usdc-settlement' 'util':71,237 'via':10,25,39 'wallet':215 'web3':68 'without':221 'x402':11,26,41,97 'x402 API' 'x402-payment'","prices":[{"id":"39b340a5-3b53-4e4d-bfc5-5f072666a929","listingId":"1a685251-1701-4802-8b36-a544241f6869","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/262","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:44.127Z"}],"sources":[{"listingId":"1a685251-1701-4802-8b36-a544241f6869","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/262","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:44.127Z","lastSeenAt":"2026-04-22T13:30:58.657Z"}],"details":{"listingId":"1a685251-1701-4802-8b36-a544241f6869","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/262 \\\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":"All endpoints priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/262"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/262"},{"claim":"Documentation pages return only 'Connect wallet' with no content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without API key management","Pay-as-you-go API access for low-volume or experimental workloads"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation 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":"2026-02-17T23:14:23.572Z"},"updatedAt":"2026-04-22T13:30:58.657Z"}}