{"id":"fa814284-5901-4876-8f42-45b2ea16fb9c","shortId":"jF93As","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/210` is labeled \"Premium API Access\" and requires a USDC payment of up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payments are settled on-chain to a designated wallet address, with no API keys, rate limits, or upfront commitments required.\n\nThe broader 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 $0.02 per request. The x402 challenge confirms the endpoint is live and accepts POST requests returning application/json.\n\nNote that while the landing page lists many endpoints, the specific `/api/v1/charges/210` endpoint's actual functionality is not clearly documented beyond the generic \"Premium API Access\" label. There is no OpenAPI schema, no request/response examples, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further documentation. The actual behavior of this endpoint — what data it returns or what input it expects — remains unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Docs, pricing, and API pages render only 'Connect wallet' with no usable content","The specific functionality of /api/v1/charges/210 ('Premium API Access') is not described anywhere","No request or response examples are available to confirm what this endpoint actually does"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/210","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/210","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 OpenAPI schema, no request/response examples, and no meaningful documentation — the docs pages all render only 'Connect wallet'. The actual functionality behind 'Premium API Access' at /api/v1/charges/210 is 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'/request':13,28 '0.02':12,27,70,149 '000':74 '20':73 '6':80 'Base network API' 'USDC API' 'accept':161 'access':7,22,42,61,191 'across':108 'actual':180,220 'address':92 'advertis':106 'ai':118 'analysi':122 'analyt':112 'api':6,21,40,60,95,190,206 'application/json':165 'avail':237 'base':9,24,50,75 'base-network' 'behavior':221 'beyond':186 'broader':104 'call':4,19,72 'categori':110 'chain':87 'challeng':154 'classif':125 'clear':184 'collect':34 'commit':101 'confirm':155 'connect':212 'convers':142 'crypto-paid API' 'data':111,115,226 'decim':81 'design':90 'doc':203 'document':185,218 'embed':126 'endpoint':41,54,107,145,157,174,178,224 'estim':136 'exampl':200 'exchang':131 'expect':233 'export':116 'feed':130 'financ':127 'four':109 'function':181 'gas':135 'generat':143 'generic':188 'geocod':140 'host':32 'infrastructur':138 'input':231 'insight':117 'json-response' 'key':96 'label':58,192 'land':170 'learn':120 'limit':98 'list':147,172 'live':159 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'mani':173 'materi':238 'metric':113 'micropayment API' 'network':51 'no-api-key' 'note':166 'on-chain':85 'openapi':196 'page':171,207 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,66,82 'per':3,18,38,71,150 'platform':105 'post':162 'post-method' 'premium':5,20,59,189 'premium API access' 'price':129,204 'prompt':214 'protocol':47 'quot':134 'rate':97,132 'remain':234 'render':209 'report':114 'request':39,151,163 'request/response':199 'requir':63,102 'return':164,228 'schema':197 'sentiment':121 'settl':84 'specif':53,176 'summar':124 'text':123 'token':133 'unclear':235 'unit':76 'upfront':100 'usdc':15,30,65,78 'usdc-settlement' 'util':139 'valid':141 'via':10,25,43 'wallet':91,213 'web3':128 'x402':11,26,45,153 'x402 API' 'x402-payment'","prices":[{"id":"f690bbde-ddbd-401b-b25c-e363184a2197","listingId":"fa814284-5901-4876-8f42-45b2ea16fb9c","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/210","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:30.872Z"}],"sources":[{"listingId":"fa814284-5901-4876-8f42-45b2ea16fb9c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/210","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:30.872Z","lastSeenAt":"2026-04-22T13:30:58.041Z"}],"details":{"listingId":"fa814284-5901-4876-8f42-45b2ea16fb9c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/210 \\\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/charges/210"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/210"},{"claim":"All endpoints listed at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"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 creating an account or managing API keys","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need permissionless, pay-as-you-go API access"],"bestFor":["Developers who want zero-signup, pay-per-use API access","AI agents that can autonomously pay for API calls via x402","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or subscription discounts","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.222Z"},"updatedAt":"2026-04-22T13:30:58.041Z"}}