{"id":"90f7bf94-8625-4b61-bcfd-bed6d38cfb0f","shortId":"n3Ru8s","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network. The platform uses the x402 payment protocol, meaning callers attach a payment header to each request rather than managing API keys or subscriptions.\n\nThe specific endpoint at `/api/v1/item/4` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" scheme. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is extremely sparse (docs, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content). There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The actual functionality behind `/api/v1/item/4` specifically is unclear — the name \"Premium API Access\" is generic and does not describe what data or service is returned.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No documentation available — docs, pricing, and README pages render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific functionality of /api/v1/item/4 ('Premium API Access') is completely undocumented","Cannot verify what data or service is actually returned upon successful payment","The broader platform lists many endpoints but none have documented request/response formats"],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/4","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/item/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but documentation is essentially nonexistent — docs, pricing, and README pages all show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and the endpoint name 'Premium API Access' at /api/v1/item/4 gives no indication of what it actually does. The listing is effectively a 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'/request':13,32 '0.02':12,31,67,125,183 '000':120 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':140 '20':119 '402':114 '402 payment API' '6':130 'Base network API' 'USDC micropayment API' 'accept':147 'access':110,237 'across':53 'actual':226 'addit':209 'address':139 'advertis':156 'ai/ml':56 'analysi':160 'analyt':55 'api':5,17,24,36,45,96,109,236 'application/json':152 'attach':86 'avail':224 'base':8,27,75,121,133 'behind':228 'beyond':188 'broader':154 'call':4,23 'caller':85 'challeng':115 'classif':163 'connect':204 'content':210 'convers':175 'crypto-paid API' 'data':54,177,245 'decim':131 'describ':243 'doc':195 'document':187,219 'embed':164 'enabl':44 'endpoint':52,63,102,146,157 'estim':172 'exact':143 'exampl':222 'exchang':167 'extrem':193 'feed':166 'finance/web3':58 'function':227 'gas':171 'generat':178 'generic':239 'geocod':173 'header':89 'howev':186 'infer':57 'infrastructur':60 'json-response' 'key':18,37,97 'land':190 'list':106 'lowpaymentfee' 'lowpaymentfee.com':39 'made':137 'manag':95 'mean':84 'name':234 'network':9,28,76 'no-api-key' 'offer':48 'openapi':214 'page':191,199 'paid':70 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payload':223 'payment':82,88,135 'per':3,22,68 'platform':6,25,46,78,155 'point':185 'post':148 'post-method' 'premium':108,235 'price':65,165,184,196 'prompt':206 'protocol':83 'quot':170 'rate':168 'rather':93 'readm':198 'render':201 'request':69,92,116,149 'request/response':217 'requir':19,38 'return':112,151,249 'schema':218 'scheme':144 'sentiment':159 'servic':247 'sinc':127 'spars':194 'spec':215 'specif':101,230 'subscript':99 'summar':162 'text':161 'token':169 'unclear':232 'unit':122 'usd':126 'usdc':15,34,72,124,128 'usdc-base-network' 'use':79,129,141 'util':61 'valid':174 'varieti':50 'via':10,29 'wallet':205 'x402':11,30,43,81 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"9ccde2b4-1d7b-4272-a12d-a89a88396799","listingId":"90f7bf94-8625-4b61-bcfd-bed6d38cfb0f","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/item/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:52.189Z"}],"sources":[{"listingId":"90f7bf94-8625-4b61-bcfd-bed6d38cfb0f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/4","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:52.189Z","lastSeenAt":"2026-04-23T19:00:36.624Z"}],"details":{"listingId":"90f7bf94-8625-4b61-bcfd-bed6d38cfb0f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/4 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base network","source_url":"https://lowpaymentfee.com/api/v1/item/4"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, asset is USDC at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/item/4"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing paid API endpoints without managing API keys or subscriptions","Making micropayment-gated API calls settled in USDC on Base","Agent-driven workflows that need pay-as-you-go API access"],"bestFor":["Developers who want keyless, pay-per-use API access","AI agents with USDC wallets on Base network","Prototyping integrations without subscription commitments"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may be inefficient","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:52.4Z"},"updatedAt":"2026-04-23T19:00:36.624Z"}}