{"id":"bed7ac8c-1725-4de7-9a8a-1faed50ddbc9","shortId":"PzfEjR","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request for data, AI, finance, and utility endpoints.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request for data, AI, finance, and utility endpoints.","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 and settle in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/payments/213` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are required. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse: the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The actual functionality behind the `/api/v1/payments/213` \"Premium API Access\" endpoint is unclear — it may be a generic payment or access endpoint rather than one of the named service endpoints listed on the homepage. Without documentation, the exact input parameters and response format cannot be determined.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","low fee API","crypto payment API","on-demand API"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) contain no usable content — only a 'Connect wallet' prompt.","No OpenAPI or schema documentation is available for any endpoint.","The specific endpoint /api/v1/payments/213 ('Premium API Access') does not correspond to any of the named service endpoints listed on the homepage; its actual functionality is unknown.","Request and response formats are entirely undocumented — integration requires trial and error."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/213","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/213","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, confirming pricing and payment details. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of the specific /api/v1/payments/213 endpoint is unclear beyond its 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'/api/v1/payments/213':114,210 '/docs':174 '/pricing':175 '/readme':178 '/request':12,31 '0.02':11,30,99,143 '000':132 '0x8335':137 '20':131 '2913':138 'Base network API' 'USDC micropayment API' 'accept':163 'access':120,213,224 'across':58 'actual':206 'ai':15,34,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,119,153,212 'application/json':168 'avail':204 'base':8,27,108,133,140 'base-network' 'behind':208 'broad':50 'call':4,23 'cannot':247 'catalog':51 'categori':60 'challeng':126 'classif':75 'classification' 'connect':184 'content':190 'convers':92 'crypto payment API' 'data':14,33,61,65 'data-analytics' 'determin':249 'document':169,199,239 'embed':76 'embeddings' 'enabl':44 'endpoint':19,38,57,95,112,162,214,225,233 'equal':142 'estim':86 'exact':150,241 'exampl':203 'exchang':81 'export':66 'extrem':171 'feed':80 'financ':16,35,77 'finance-data' 'format':246 'four':59 'function':207 'gas':85 'generat':93 'generic':221 'geocod':90 'geocoding' 'homepag':237 'infrastructur':88 'input':242 'insight':67 'key':154 'learn':70 'limit':158 'list':116,234 'low fee API' 'lowpaymentfee.com':39 'machin':69 'made':146 'maxamountrequir':129 'may':218 'metric':63 'name':231 'network':109 'no-api-key' 'offer':48 'on-demand API' 'one':228 'openapi':194 'page':179 'paramet':243 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':144,222 'per':3,22,55,100 'platform':6,25,46 'post':164 'premium':118,211 'price':79,97 'prompt':186 'quot':84 'rate':82,157 'rather':226 'render':181 'report':64 'request':56,101,165 'request/response':197 'requir':160 'respons':245 'return':122,167 'schema':198 'scheme':151 'sentiment':71 'sentiment-analysis' 'servic':232 'settl':103 'spars':172 'spec':195 'specif':111 'subscript':155 'summar':74 'text':73 'text-summarization' 'token':83 'unclear':216 'unit':134 'usag':202 'usdc':105,136 'usdc-settlement' 'util':18,37,89 'valid':91,124 'via':9,28,147 'wallet':185 'web3':78 'without':238 'x402':10,29,43,125,149 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"9a784663-e48e-4c71-8870-814d50a9deac","listingId":"bed7ac8c-1725-4de7-9a8a-1faed50ddbc9","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/213","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:55.357Z"}],"sources":[{"listingId":"bed7ac8c-1725-4de7-9a8a-1faed50ddbc9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/213","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:55.357Z","lastSeenAt":"2026-04-23T04:01:30.758Z"}],"details":{"listingId":"bed7ac8c-1725-4de7-9a8a-1faed50ddbc9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/213 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","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 returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/payments/213"},{"claim":"Available API 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 further content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data (prices, exchange rates, gas estimates) with per-call USDC payments","Running utility operations (geocoding, validation, conversion) on a pay-as-you-go basis","Integrating agent-purchasable API calls into autonomous workflows via x402"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle payments autonomously via x402 on Base","Projects needing low-cost micropayment-gated endpoints without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume use cases where per-request pricing may not be cost-effective","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.535Z"},"updatedAt":"2026-04-23T04:01:30.758Z"}}