{"id":"3bd14907-2b17-4449-a093-6e2cd1f94ca5","shortId":"YK5jgx","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 upfront commitments. The specific endpoint at `/api/v1/transactions/71` is listed as \"Premium API Access\" and returns `application/json` via POST.\n\nThe platform advertises four categories of APIs: 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, settle in USDC on Base, and then receive the response.\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 content. The x402 challenge for this specific endpoint shows a maxAmountRequired of 20000 base units of USDC (6 decimals), which equals $0.02, consistent with the site's advertised pricing.","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","validation","conversion"],"categories":["llm","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 API","pay per call API","USDC API","Base network API","micropayment API","no-auth API"],"warnings":["No OpenAPI or schema documentation available — all docs/pricing/README pages return only 'Connect wallet'","No request or response examples; the purpose of '/api/v1/transactions/71' specifically is unclear","The broad catalog of endpoints (AI, finance, analytics, utilities) is advertised but none have documented input/output schemas","Cannot verify that the advertised AI/ML or finance endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/71","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/transactions/71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples. The specific endpoint '/api/v1/transactions/71' has no description beyond its title. Effectively a stub 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'learn':112 'limit':75 'list':86 'low payment fee' 'lowpaymentfee.com':31 'machin':111 'maxamountrequir':211 'metric':105 'micropayment API' 'network':9,24,68 'no-auth API' 'offer':40 'openapi':187 'page':171 'paid':62 'pay':2,17 'pay per call API' 'pay-per-cal':1,16 'pay-per-request' 'payment':141,149 'per':3,18,60 'platform':6,21,38,97 'post':95 'premium':88 'price':121,168,229 'prompt':178 'protocol':142 'quot':126 'rate':74,124 'readm':170 'receiv':144,158 'render':173 'report':106 'request':61 'request/response':190 'respons':160 'return':92 'schema':191 'sentiment':113 'servic':55 'settl':151 'show':209 'site':226 'span':46 'spars':164 'spec':188 'specif':81,207 'summar':116 'technic':182 'text':115 'token':125 'unit':215 'upfront':78 'usag':195 'usdc':15,30,64,153,217 'usdc-base-network' 'util':54,131 'valid':133 'validation' 'via':10,25,94 'wallet':177 'web3':120 'x402':11,26,35,140,203 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"ada03019-8a4a-415a-8f98-460cd9516a30","listingId":"3bd14907-2b17-4449-a093-6e2cd1f94ca5","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/transactions/71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:55.047Z"}],"sources":[{"listingId":"3bd14907-2b17-4449-a093-6e2cd1f94ca5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/71","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:55.047Z","lastSeenAt":"2026-04-22T16:32:14.358Z"}],"details":{"listingId":"3bd14907-2b17-4449-a093-6e2cd1f94ca5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/71 \\\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 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 this endpoint shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/71"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying real-time financial data or crypto prices without API key registration","Running AI inference tasks (sentiment, summarization, classification) on a per-request payment basis","Geocoding or data validation as a lightweight utility service","Exporting analytics data or generating insights reports on demand","Estimating gas costs for blockchain transactions"],"bestFor":["Developers wanting instant API access without signup or API keys","Agents and bots that can settle x402 payments in USDC on Base","Low-volume or sporadic usage where per-call pricing is more economical than subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users who need detailed API documentation, SDKs, or OpenAPI specs before integrating","Anyone unable to pay with USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.584Z"},"updatedAt":"2026-04-22T16:32:14.358Z"}}