{"id":"57204360-7b36-4f19-893d-16070e0d677c","shortId":"hgT7XN","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/391` accepts POST requests and requires payment of up to 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 exact scheme with no API keys, rate limits, or upfront commitments required.\n\nThe broader lowpaymentfee.com platform advertises a suite of APIs across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request. However, the specific endpoint being listed here (`/api/v1/charges/391`) is labeled generically as \"Premium API Access\" and does not clearly map to any single named API from the catalog.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what data or functionality this particular endpoint returns. The endpoint is confirmed live (returns a valid 402 challenge), but the lack of documentation makes it difficult to determine the actual payload or use case.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","misc"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","crypto-paid API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The endpoint path /api/v1/charges/391 does not match any named API in the site's catalog, making its actual function unclear","No request or response examples available anywhere in crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/391","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/391","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, no documentation beyond a wallet-connect prompt, and the endpoint name 'Premium API Access' is generic with no indication of what it actually returns. This is effectively a stub 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'/api/v1/charges/391':48,156 '/docs':182 '/pricing':184 '/readme':186 '/request':13,28 '0.02':12,27,72,146 '000':59 '0x8335':64 '20':58 '2913':65 '402':228 '6':77 'Base network API' 'USDC micropayment API' 'accept':49 'access':7,22,38,163 'across':106 'actual':241 'advertis':101 'ai':116 'analysi':120 'analyt':110 'api':6,21,37,89,105,162,173 'base':9,24,60,68 'broader':98 'call':4,19 'case':245 'catalog':176 'categori':108 'challeng':229 'classif':123 'clear':167 'commit':95 'confirm':223 'connect':192 'convers':139 'crypto-paid API' 'data':109,113,213 'decim':78 'descript':210 'detail':199 'determin':239 'difficult':237 'document':177,234 'embed':124 'endpoint':32,142,152,218,221 'equal':71 'estim':134 'exact':85 'exampl':207 'exchang':129 'export':114 'extrem':179 'feed':128 'financ':125 'four':107 'function':215 'gas':133 'generat':140 'generic':159 'geocod':137 'howev':149 'infrastructur':136 'insight':115 'key':90 'label':158 'lack':232 'learn':118 'limit':92 'list':144,154 'live':224 'lowpaymentfee' 'lowpaymentfee.com':34,99 'machin':117 'made':81 'make':235 'map':168 'metric':111 'name':172 'network':69 'no-api-key' 'openapi':203 'page':187 'particular':217 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payload':242 'payment':42,54,79 'per':3,18,73,147 'platform':100 'post':50 'post-endpoint' 'premium':5,20,36,161 'price':127 'prompt':194 'protocol':43 'provid':35 'quot':132 'rate':91,130 'render':189 'report':112 'request':51,74,148 'request/response':206 'requir':53,96 'resourc':46 'return':219,225 'schema':204 'scheme':86 'sentiment':119 'singl':171 'spars':180 'specif':45,151 'suit':103 'summar':122 'technic':198 'text':121 'token':131 'unit':61 'upfront':94 'usdc':15,30,63,75 'usdc-base' 'use':76,244 'valid':138,227 'via':10,25,39,82 'wallet':193 'web3':126 'x402':11,26,41,84 'x402 API' 'x402-payment'","prices":[{"id":"710fe4b4-cd53-46c4-9bb1-a899e5b1fb51","listingId":"57204360-7b36-4f19-893d-16070e0d677c","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/391","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:23.563Z"}],"sources":[{"listingId":"57204360-7b36-4f19-893d-16070e0d677c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/391","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:23.563Z","lastSeenAt":"2026-04-22T07:31:04.163Z"}],"details":{"listingId":"57204360-7b36-4f19-893d-16070e0d677c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/391 \\\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 a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/391"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/391"},{"claim":"All listed APIs priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs 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","Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers wanting keyless, pay-per-use API access settled in USDC on Base","AI agents that can handle x402 payment challenges autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Anyone without a Base-compatible USDC wallet","High-volume consumers who need bulk pricing or rate guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.678Z"},"updatedAt":"2026-04-22T07:31:04.163Z"}}