{"id":"f6c52233-a734-4dc3-9da4-b3f32aed5980","shortId":"7qy5NH","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":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/charges/9` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum charge of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header to each request.\n\nThe broader lowpaymentfee.com platform advertises endpoints 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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point. However, the specific endpoint probed here (`/api/v1/charges/9`) is simply described as \"Premium API Access\" without further detail on what data or functionality it returns.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/charges/9` endpoint actually returns. The endpoint is confirmed live (returns a valid 402 x402 challenge), but the lack of documentation makes it difficult to determine its actual utility.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages are empty","No OpenAPI or schema describing request parameters or response format","The specific functionality of /api/v1/charges/9 ('Premium API Access') is undefined — it is unclear what data or service it provides","Cannot verify actual response content without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/9","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/9","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, but there is no documentation, no OpenAPI schema, no request/response examples, and no clear description of what this specific endpoint returns. The site's docs pages are empty beyond a wallet-connect prompt. Effectively a stub 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'/api/v1/charges/9':56,174,228 '/docs':197 '/pricing':199 '/readme':201 '/request':13,28,165 '0.02':12,27,87,164 '000':82 '0x8335':72 '20':81 '2913':73 '402':240 '6':92 'Base network API' 'USDC micropayment API' 'accept':63 'access':7,22,42,61,181 'across':121 'actual':230,254 'advertis':119 'ai':131 'analysi':135 'analyt':125 'api':6,21,40,60,95,180 'attach':106 'base':9,24,50,75,83 'base-network' 'broader':116 'call':4,19 'caller':104 'categori':123 'challeng':242 'charg':79 'classif':138 'collect':34 'commit':101 'confirm':235 'connect':207 'content':213 'contract':71 'convers':155 'crypto-paid API' 'data':124,128,187 'decim':93 'describ':177 'descript':224 'detail':184 'determin':252 'difficult':250 'document':192,247 'embed':139 'endpoint':41,54,120,158,171,229,233 'equal':86 'estim':149 'exampl':221 'exchang':144 'export':129 'extrem':194 'feed':143 'financ':140 'four':122 'function':189 'gas':148 'generat':156 'geocod':153 'header':111 'host':32 'howev':168 'infrastructur':151 'insight':130 'key':96 'label':58 'lack':245 'learn':133 'limit':98 'list':160 'live':236 'lowpaymentfee' 'lowpaymentfee.com':31,117 'machin':132 'make':248 'maximum':78 'metric':126 'network':51 'no-api-key' 'openapi':217 'page':202 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,66,110 'per':3,18,38,88 'platform':118 'point':167 'post':64 'post-endpoint' 'premium':5,20,59,179 'premium API access' 'price':142,166 'probe':172 'prompt':209 'protocol':47 'quot':147 'rate':97,145 'render':204 'report':127 'request':39,65,89,114 'request/response':220 'requir':103 'return':191,231,237 'schema':218 'sentiment':134 'settl':68 'simpli':105,176 'spars':195 'specif':53,170 'substant':212 'summar':137 'text':136 'token':146 'unit':84 'upfront':100 'usdc':15,30,70,90 'usdc-settlement' 'use':91 'util':152,255 'valid':154,239 'via':10,25,43 'wallet':208 'web3':141 'without':182 'x':109 'x-payment':108 'x402':11,26,45,241 'x402 API' 'x402-payment'","prices":[{"id":"b187df41-6982-4770-a330-97ed186f3801","listingId":"f6c52233-a734-4dc3-9da4-b3f32aed5980","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/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:35.051Z"}],"sources":[{"listingId":"f6c52233-a734-4dc3-9da4-b3f32aed5980","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/9","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:35.051Z","lastSeenAt":"2026-04-23T21:32:04.308Z"}],"details":{"listingId":"f6c52233-a734-4dc3-9da4-b3f32aed5980","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/9 \\\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 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/9"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, and 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/charges/9"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without signing up for an account or obtaining API keys","Making one-off paid API calls settled instantly in USDC on Base","Integrating pay-per-request endpoints into agent workflows via x402 protocol"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","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 wallet or USDC balance","High-volume use cases where per-request pricing may add up compared to flat-rate plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.106Z"},"updatedAt":"2026-04-23T21:32:04.308Z"}}