{"id":"548d0c79-e2f1-4f2e-abc2-00d4834703c6","shortId":"v22kcG","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 catalog 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 subscriptions 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/payments/369` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. 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 essentially empty (docs, pricing, and README pages only show a \"Connect wallet\" prompt), so the actual request/response schemas for individual endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","data-export"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api"],"warnings":["No documentation available — docs, pricing, and README pages only show 'Connect wallet'","No OpenAPI or request/response schema for any endpoint","The purpose of '/api/v1/payments/369' specifically (vs. the other listed endpoints) is unclear","Cannot verify that the advertised AI, finance, or utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/369","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/payments/369","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 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what this specific 'Premium API Access' endpoint actually does. The docs, pricing, and README pages are all blank beyond a wallet-connect prompt. The listing is effectively a 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'/request':13,28 '0.02':12,27,59,134,190 '000':123 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':146 '0x8335':128 '20':122 '2913':129 '300':149 '6':138 'accept':154 'access':113 'actual':215 'address':145 'advertis':163 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':49 'analysi':167 'analyt':48 'api':5,20,37,71,112 'application/json':159 'attach':87 'base':8,23,67,124,131 'base network api' 'beyond':195 'broad':42 'broader':161 'call':4,19 'caller':86 'catalog':43 'challeng':118 'classif':170 'connect':210 'convers':182 'cost':58 'crypto-gas-estimates' 'data':47,52,184 'data-analytics' 'data-export' 'decim':139 'doc':202 'document':194 'embed':171 'empti':201 'enabl':36 'endpoint':45,57,105,153,164,220 'equal':133 'essenti':200 'estim':179 'everi':56 'exchang':174 'exchange-rates' 'feed':173 'finance-price-feeds' 'finance/web3':51 'gas':178 'generat':185 'geocod':180 'geocoding' 'given':135 'handl':83 'header':97 'howev':193 'immedi':102 'individu':219 'infer':50 'inlin':85 'key':72 'land':197 'limit':75 'list':109 'low payment fee' 'lowpaymentfee.com':31 'micropayment api' 'network':9,24,68 'no-auth api' 'offer':40 'page':198,206 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':84,91,96,141 'per':3,18,60 'platform':6,21,38,162 'point':192 'post':155 'premium':111 'price':172,191,203 'prompt':212 'protocol':82 'quot':177 'rate':74,175 'readm':205 'receiv':99 'request':61,119,156 'request/response':216 'requir':79 'respons':101 'return':115,158 'schema':217 'second':150 'sent':143 'sentiment':166 'servic':55 'show':208 'sign':89 'span':46 'specif':104 'subscript':78 'summar':169 'text':168 'timeout':151 'token':176 'unit':125 'unknown':222 'usdc':15,30,64,90,127,136 'usdc api' 'usdc-base-network' 'util':54 'valid':181 'via':10,25 'wallet':211 'x':95 'x-payment':94 'x402':11,26,35,81,117 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"ca1c7953-3b46-430f-9300-ed86000bac63","listingId":"548d0c79-e2f1-4f2e-abc2-00d4834703c6","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/payments/369","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:43.476Z"}],"sources":[{"listingId":"548d0c79-e2f1-4f2e-abc2-00d4834703c6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/369","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:43.476Z","lastSeenAt":"2026-04-23T02:01:19.750Z"}],"details":{"listingId":"548d0c79-e2f1-4f2e-abc2-00d4834703c6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/369 \\\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":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/payments/369"},{"claim":"Platform lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (docs, pricing, README) contain only a 'Connect wallet' prompt with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without API key management","Fetching real-time crypto token quotes and gas estimates via micropayment","Geocoding or data validation as a utility service with no subscription commitment","Exporting analytics data or generating insights on a per-request billing model"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse utility endpoints","Developers prototyping with low-cost API calls and no signup friction","Web3-native applications already holding USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring non-USDC or non-Base-network payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.264Z"},"updatedAt":"2026-04-23T02:01:19.750Z"}}