{"id":"aafecf45-cc47-4a81-b21b-f460411ed641","shortId":"GBb4qG","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach a signed USDC payment in the X-PAYMENT header and receive the response immediately.\n\nThe specific endpoint at `/api/v1/transfers/48` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02). The platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transfers/48` endpoint actually returns. The endpoint is live (402 challenge confirmed), but without documentation it is unclear what data or functionality this specific path provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","crypto-data","geocoding","utility-services"],"categories":["general","ai","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","metered API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content.","No OpenAPI or schema available — request and response formats are unknown.","The specific endpoint '/api/v1/transfers/48' has no description beyond 'Premium API Access'; its actual functionality is unclear.","The platform lists many endpoints on its homepage but none have documented input/output schemas."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/48","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/transfers/48","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, confirming pricing and network. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no explanation of what '/api/v1/transfers/48' actually does. The listing is essentially a stub with confirmed 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'/request':13,28 '0.02':12,27,58,133,163 '000':122 '0x8335':127 '20':121 '2913':128 '402':116,210 '6':131 'Base network API' 'USDC micropayment API' 'access':112 'actual':204 'addit':137 'advertis':136 'ai-inference' 'ai/ml':48 'analysi':141 'analyt':47 'api':5,20,37,70,111,172 'attach':86 'base':8,23,66,123,130 'call':4,19 'caller':85 'challeng':117,211 'classif':144 'commit':77 'confirm':212 'connect':181 'content':187 'convers':156 'cost':57 'crypto-data' 'crypto-paid API' 'data':46,51,220 'data-analytics' 'decim':132 'descript':198 'doc':171 'document':166,215 'embed':145 'enabl':36 'endpoint':44,56,104,138,203,207 'estim':153 'everi':55 'exampl':195 'exchang':148 'extrem':168 'feed':147 'finance-data' 'finance/web3':50 'function':222 'gas':152 'generat':158 'geocod':154 'geocoding' 'handl':82 'header':96 'immedi':101 'infer':49 'infrastructur':53 'inlin':84 'key':71 'limit':74 'list':108 'live':209 'lowpaymentfee' 'lowpaymentfee.com':31 'metered API' 'network':9,24,67 'no-api-key' 'offer':40 'openapi':191 'page':176 'paid':61 'path':225 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':83,90,95 'per':3,18,59 'platform':6,21,38,135 'point':165 'premium':110 'price':146,164,173 'prompt':183 'protocol':81 'provid':226 'quot':151 'rate':73,149 'readm':175 'receiv':98 'render':178 'request':60,118 'request/response':194 'requir':78 'respons':100 'return':114,205 'schema':192 'sentiment':140 'sign':88 'span':45 'spars':169 'specif':103,224 'summar':143 'text':142 'token':150 'unclear':218 'unit':124 'usdc':15,30,63,89,126 'usdc-base-network' 'util':54 'utility-services' 'valid':155 'varieti':42 'via':10,25 'wallet':182 'without':214 'x':94 'x-payment':93 'x402':11,26,35,80 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"12742e2b-1a4f-4ec3-b992-5af937bd6fe1","listingId":"aafecf45-cc47-4a81-b21b-f460411ed641","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/transfers/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:57.881Z"}],"sources":[{"listingId":"aafecf45-cc47-4a81-b21b-f460411ed641","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/48","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:57.881Z","lastSeenAt":"2026-04-22T07:31:57.310Z"}],"details":{"listingId":"aafecf45-cc47-4a81-b21b-f460411ed641","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/48 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/transfers/48"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time crypto token quotes and gas estimates via micropayment","Running geocoding or data validation calls on a per-request payment basis","Exporting analytics data or generating reports with no subscription commitment"],"bestFor":["Developers wanting instant API access without registration or API keys","Agents and bots that can attach x402 USDC payments per call","Low-volume or sporadic usage where per-request pricing is more economical than subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users who need detailed documentation, SLAs, or guaranteed uptime","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.562Z"},"updatedAt":"2026-04-22T07:31:57.310Z"}}