{"id":"bcb27b6b-c443-4c4e-b79d-509007a2b0ea","shortId":"zHjRNU","kind":"x402","title":"Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request 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 priced at $0.02 per request, paid in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/transfers/116` 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. Payment is made via the x402 protocol with an `exact` scheme — no API keys, subscriptions, or rate limits are required. The payment address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` and the timeout is 300 seconds.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /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 examples of what the endpoints actually return. The endpoint names and categories are listed on the homepage, but the actual functionality behind `/api/v1/transfers/116` specifically is unclear — it does not match any of the named endpoints on the landing page. Treat this listing with caution until more documentation is available.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["llm","finance","geo","infrastructure"],"synonyms":["pay per call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto payment API","serverless API"],"warnings":["The endpoint path /api/v1/transfers/116 does not match any of the named endpoints listed on the homepage — its actual functionality is unknown.","Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content.","No OpenAPI spec, no request/response schema, and no usage examples are available.","The platform's actual service delivery behind these endpoints is unverified — proceed with caution."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/116","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/116","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but documentation is essentially nonexistent beyond the landing page catalog. There is no OpenAPI spec, no request/response examples, and the specific endpoint path '/api/v1/transfers/116' does not correspond to any named endpoint on the homepage. The actual functionality is 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'/api/v1/transfers/116':113,233 '/call':19,38 '/docs':183 '/pricing':185 '/readme':187 '0.02':18,37,99,134 '000':129 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':167 '20':128 '300':172 '402':123 '6':139 'Base network API' 'USDC API' 'access':119 'across':58 'actual':216,230 'addit':198 'address':165 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,118,155 'avail':259 'base':8,27,107,130,142 'behind':232 'beyond':175 'broad':50 'catalog':51 'categori':60,222 'caution':254 'challeng':124 'classif':75 'classification' 'connect':193 'content':199 'convers':92 'crypto payment API' 'data':11,30,61,65 'data-analytics' 'decim':140 'document':174,208,257 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,111,215,219,245 'estim':86 'exact':152 'exampl':211 'exchang':81 'export':66 'extrem':180 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'function':231 'gas':85 'generat':93 'geocod':90 'geocoding' 'homepag':227 'infrastructur':88 'insight':67 'key':156 'land':177,248 'learn':70 'limit':160 'list':115,224,252 'low fee API' 'lowpaymentfee.com':39 'machin':69 'made':145 'match':240 'metric':63 'micropayment API' 'name':220,244 'network':108 'offer':48 'openapi':203 'page':178,188,249 'paid':102 'pay':2,21,54 'pay per call API' 'pay-per-request':1,20,53 'payment':143,164 'per':3,22,55,100 'platform':6,25,46 'premium':117 'price':79,97 'prompt':195 'protocol':149 'quot':84 'rate':82,159 'render':190 'report':64 'request':4,23,56,101,125 'request/response':206 'requir':162 'return':121,217 'schema':207 'scheme':153 'second':173 'sentiment':71 'sentiment-analysis' 'serverless API' 'sinc':136 'spars':181 'spec':204 'specif':110,234 'subscript':157 'summar':74 'text':73 'text-summarization' 'timeout':170 'token':83 'treat':250 'unclear':236 'unit':131 'usd':135 'usdc':104,133,137 'usdc-base' 'use':138 'util':15,34,89 'utility-apis' 'valid':91 'via':9,28,146 'wallet':194 'web3':78 'x402':10,29,43,148 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"c968baf5-fad5-46df-91f0-c019c5315208","listingId":"bcb27b6b-c443-4c4e-b79d-509007a2b0ea","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/116","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:15.481Z"}],"sources":[{"listingId":"bcb27b6b-c443-4c4e-b79d-509007a2b0ea","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/116","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:15.481Z","lastSeenAt":"2026-04-22T16:32:15.565Z"}],"details":{"listingId":"bcb27b6b-c443-4c4e-b79d-509007a2b0ea","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/116 \\\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":"All endpoints are priced at $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/116 requests up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/transfers/116"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no additional content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without API key management","Fetching real-time financial data or crypto gas estimates with per-call payment","Geocoding or data validation as a utility service paid in USDC on Base","Exporting data or generating analytics reports on a pay-as-you-go basis"],"bestFor":["Developers or agents who want keyless, pay-per-use API access","x402-compatible agents settling micropayments in USDC on Base","Prototyping or low-volume use cases where $0.02/request is cost-effective"],"notFor":["High-volume production workloads where per-request pricing adds up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Anyone without USDC on Base or an x402-compatible payment client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.562Z"},"updatedAt":"2026-04-22T16:32:15.565Z"}}