{"id":"0706042c-d4b1-48b0-a21c-77e104955e6e","shortId":"wSN2YV","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are priced at $0.02 per request, settled in USDC on the Base network. The x402 protocol means no API keys, no accounts, and no rate limits — callers simply attach a payment header to each request.\n\nThe specific endpoint at `/api/v1/payments/121` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. The payment scheme is \"exact\" with a 300-second timeout. The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, gas estimates, geocoding, validation, conversion, and data export — all at the same $0.02 price point.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled pages. The endpoint is confirmed live (402 challenge captured), but without documentation it is unclear what request body this specific endpoint expects or what response it returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto API payments"],"warnings":["No API documentation available — all doc/pricing/README pages render only 'Connect wallet'","No OpenAPI or schema specification found","The specific functionality of /api/v1/payments/121 ('Premium API Access') is undocumented and unclear","No request body schema or response schema available for any endpoint","Platform appears to be a demo or early-stage project with many listed endpoints but no documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/121","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/121","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schemas, and no examples. The specific purpose of the /api/v1/payments/121 'Premium API Access' endpoint is unclear beyond its 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'/request':13,30 '0.02':12,29,69,127,168 '000':121 '20':120 '300':137 '402':115,216 'Base network API' 'USDC API' 'access':111 'account':87 'advertis':143 'ai-inference' 'ai/ml':57 'analysi':147 'analyt':56 'api':5,15,22,32,41,84,110,177 'attach':94 'avail':206 'base':8,25,77,122,129 'base-network' 'bodi':227 'broad':46 'broader':141 'call':4,21 'caller':92 'captur':218 'catalog':47 'challeng':116,217 'classif':150 'classification' 'confirm':214 'connect':186 'content':192 'convers':160 'crawl':209 'crypto API payments' 'data':55,60,162 'data-analytics' 'doc':176 'document':171,201,221 'embed':151 'embeddings' 'enabl':40 'endpoint':53,65,103,144,212,230 'estim':157 'exact':134 'exampl':205 'exchang':154 'expect':231 'export':163 'extrem':173 'feed':153 'finance-data' 'finance/web3':59 'gas':156 'geocod':158 'geocoding' 'header':97 'i.e':126 'infer':58 'key':16,33,85 'limit':91 'list':107 'live':215 'lowpaymentfee' 'lowpaymentfee.com':35 'mean':82 'micropayment API' 'network':78 'no-api-key' 'offer':44 'openapi':196 'page':181,210 'pay':2,19,50 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':49 'payment':96,131 'per':3,20,51,70 'platform':6,23,42,142 'point':170 'premium':109 'price':67,152,169,178 'prompt':188 'protocol':81 'rate':90,155 'readm':180 'render':183 'request':52,71,100,117,226 'request/response':199 'requir':17,34 'respons':234 'return':113,236 'schema':200 'scheme':132 'second':138 'sentiment':146 'sentiment-analysis' 'servic':63 'settl':72 'simpli':93 'span':54 'spars':174 'spec':197 'specif':102,229 'substant':191 'summar':149 'text':148 'text-summarization' 'timeout':139 'unclear':224 'unit':123 'usag':204 'usdc':9,26,74,125 'usdc-settlement' 'util':62 'valid':159 'via':10,27 'wallet':187 'without':220 'x402':11,28,39,80 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"d6b19d85-a4d0-4270-90a7-a713cc685811","listingId":"0706042c-d4b1-48b0-a21c-77e104955e6e","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/121","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:22.696Z"}],"sources":[{"listingId":"0706042c-d4b1-48b0-a21c-77e104955e6e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/121","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:22.696Z","lastSeenAt":"2026-04-23T05:01:21.555Z"}],"details":{"listingId":"0706042c-d4b1-48b0-a21c-77e104955e6e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/121 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <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 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":"Endpoint returns 402 challenge requesting 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with exact scheme and 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/payments/121"},{"claim":"Platform offers endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto prices, gas estimates, and exchange rates on a per-call basis","Running geocoding, validation, or data conversion utilities with instant USDC micropayments","Exporting data or generating analytics reports via pay-per-request endpoints"],"bestFor":["Developers who want instant API access without signup or key management","Agents and bots that can settle USDC payments on Base automatically","Low-volume or sporadic API consumers who prefer pay-per-use over subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users without a Base-compatible USDC wallet or x402 client","Anyone needing detailed API documentation or SLAs before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:10.018Z"},"updatedAt":"2026-04-23T05:01:21.555Z"}}