{"id":"6e8d6797-3575-44ca-a380-a4739440df52","shortId":"Wjc7ZU","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 broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. 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 specific endpoint at `/api/v1/transfers/154` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals) on Base.\n\nThe platform advertises categories including 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 follow the x402 payment protocol: callers receive a 402 challenge with payment details, submit an X-PAYMENT header with a signed USDC transaction, and receive the API response upon settlement.\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 spec, no request/response schema documentation, and no usage examples available from the crawled material. The exact functionality behind the `/api/v1/transfers/154` path labeled \"Premium API Access\" is unclear, as it does not map to any of the publicly listed endpoint categories.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["ai","finance","data","infrastructure"],"synonyms":["pay per call API","x402 API","USDC API payment","micropayment API","Base network API","low fee API","crypto API access"],"warnings":["No OpenAPI or schema documentation available — all /docs, /pricing, /api, /README pages return only 'Connect wallet'","The endpoint path /api/v1/transfers/154 does not correspond to any of the publicly listed API categories; its actual functionality is unknown","No request body schema or response schema is documented anywhere","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/154","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/154","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 it accepts USDC on Base at $0.02/request. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of /api/v1/transfers/154 ('Premium API Access') is unexplained and doesn't match any listed category. This is effectively a stub 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'/api/v1/transfers/154':84,231 '/docs':190 '/pricing':192 '/readme':194 '/request':13,28 '0.02':12,27,59,106 '000':100 '20':99 '402':94,162 '6':110 'Base network API' 'USDC API payment' 'access':90,236 'advertis':116 'ai':126 'ai-inference' 'ai/ml':49 'analysi':130 'analyt':48,120 'api':5,20,37,71,89,181,235 'avail':221 'base':8,23,67,101,113 'behind':229 'broad':42 'call':4,19 'caller':159 'categori':117,251 'challeng':95,163 'classif':133 'classification' 'commit':78 'connect':200 'convers':150 'cost':58 'crawl':224 'crypto API access' 'crypto-quotes' 'data':47,52,119,123 'data-analytics' 'decim':111 'detail':166,207 'document':185,216 'embed':134 'embeddings' 'enabl':36 'endpoint':45,57,82,153,250 'estim':144 'everi':56 'exact':227 'exampl':220 'exchang':139 'export':124 'extrem':187 'feed':138 'financ':135 'finance-data' 'finance/web3':51 'follow':154 'function':228 'gas':143 'generat':151 'geocod':148 'geocoding' 'header':172 'i.e':105 'includ':118 'infer':50 'infrastructur':146 'insight':125 'key':72 'label':233 'learn':128 'limit':75 'list':86,249 'low fee API' 'lowpaymentfee.com':31 'machin':127 'map':243 'materi':225 'metric':121 'micropayment API' 'network':9,24,68 'no-api-key' 'offer':40 'openapi':211 'page':195 'paid':62 'path':232 'pay':2,17 'pay per call API' 'pay-per-cal':1,16 'pay-per-request' 'payment':157,165,171 'per':3,18,60 'platform':6,21,38,115 'premium':88,234 'price':137 'prompt':202 'protocol':158 'public':248 'quot':142 'rate':74,140 'receiv':160,179 'render':197 'report':122 'request':61,96 'request/response':214 'requir':79 'respons':182 'return':92 'schema':215 'sentiment':129 'sentiment-analysis' 'servic':55 'set':43 'settlement':184 'sign':175 'sinc':107 'span':46 'spars':188 'spec':212 'specif':81 'submit':167 'summar':132 'technic':206 'text':131 'text-summarization' 'token':141 'transact':177 'unclear':238 'unit':102 'upon':183 'usag':219 'usdc':15,30,64,104,108,176 'usdc-base-network' 'use':109 'util':54,147 'utility-services' 'valid':149 'via':10,25 'wallet':201 'web3':136 'x':170 'x-payment':169 'x402':11,26,35,156 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"ef9a3de8-b5e3-4ab0-89ef-2d37a2de5db0","listingId":"6e8d6797-3575-44ca-a380-a4739440df52","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/154","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:38.574Z"}],"sources":[{"listingId":"6e8d6797-3575-44ca-a380-a4739440df52","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/154","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:38.574Z","lastSeenAt":"2026-04-22T09:01:48.242Z"}],"details":{"listingId":"6e8d6797-3575-44ca-a380-a4739440df52","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/154 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/transfers/154 requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/154"},{"claim":"Platform offers endpoints in 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 management","Fetching real-time financial data and crypto quotes with per-request USDC micropayments","Running utility operations like geocoding or data validation on a pay-as-you-go basis","Integrating agent-driven workflows that autonomously pay for API calls via x402"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can autonomously settle micropayments on Base","Projects needing quick access to diverse endpoints without signup or rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.519Z"},"updatedAt":"2026-04-22T09:01:48.242Z"}}