{"id":"373d4278-4824-4739-a1bf-6ab63876eb05","shortId":"nMS7qB","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 suite of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are pay-per-request using USDC on the Base network, with no API keys, no rate limits, and no commitments required. The specific endpoint at `/api/v1/orders/49` is labeled \"Premium API Access\" and accepts POST requests settled via x402 with a maximum cost of $0.02 per call (20,000 base units of USDC, which has 6 decimals).\n\nThe broader platform advertises categories including: 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 (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawl. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the actual functionality behind `/api/v1/orders/49` and the other listed endpoints cannot be verified from available material.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"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":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema provided for any endpoint","The specific endpoint /api/v1/orders/49 is labeled 'Premium API Access' but its actual functionality is undocumented","Request and response formats are entirely unknown — no examples available","Cannot verify that any of the advertised AI, finance, or utility endpoints actually return meaningful data"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/49","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/orders/49","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 x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The actual functionality of /api/v1/orders/49 is unknown beyond its label. This is effectively a stub 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'/call':19,38 '/request':168 '0.02':18,37,110,167 '000':114 '20':113 '402':216 '6':121 'Base network API' 'USDC API' 'accept':99 'access':97 'actual':221 'advertis':126 'ai':12,31,136 'ai-inference' 'ai/ml':56 'analysi':140 'analyt':55,130 'api':5,24,45,79,96,176 'avail':204,234 'base':8,27,75,115 'behind':223 'broader':124 'call':112 'cannot':230 'categori':127 'challeng':218 'classif':143 'classification' 'commit':86 'confirm':211 'connect':185 'content':191 'convers':159 'cost':108 'crawl':207 'crypto payment API' 'crypto-quotes' 'data':11,30,54,59,129,133 'data-analytics' 'decim':122 'detail':202 'doc':175 'document':170,203 'embed':144 'embeddings' 'enabl':44 'endpoint':16,35,52,65,90,163,209,229 'estim':154 'exampl':199 'exchang':149 'export':134 'extrem':172 'feed':148 'financ':13,32,145 'finance-data' 'finance/web3':58 'function':222 'gas':153 'general':61 'generat':160 'geocod':157 'geocoding' 'includ':128 'infer':57 'infrastructur':156 'insight':135 'key':80 'label':94 'learn':138 'limit':83 'list':162,228 'live':212 'low fee API' 'lowpaymentfee.com':39 'machin':137 'materi':235 'maximum':107 'metric':131 'micropayment API' 'network':76 'offer':48 'openapi':195 'page':180 'pay':2,21,68 'pay per call API' 'pay-per-request':1,20,67 'per':3,22,69,111 'platform':6,25,46,125 'post':100 'premium':95 'price':147,169,177 'prompt':187 'proper':215 'quot':152 'rate':82,150 'readm':179 'render':182 'report':132 'request':4,23,70,101 'request/response':198 'requir':87 'return':213 'schema':196 'sentiment':139 'sentiment-analysis' 'serverless API' 'servic':63 'settl':102 'share':164 'span':53 'spars':173 'specif':89 'suit':50 'summar':142 'text':141 'text-summarization' 'token':151 'unit':116 'usdc':72,118 'usdc-base' 'use':71 'util':15,34,62 'utility-services' 'valid':158 'verifi':232 'via':9,28,103 'wallet':186 'web3':146 'x402':10,29,43,104,217 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"b5393de5-c2e2-41b6-bc02-89b7055501d1","listingId":"373d4278-4824-4739-a1bf-6ab63876eb05","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/orders/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:02.215Z"}],"sources":[{"listingId":"373d4278-4824-4739-a1bf-6ab63876eb05","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:02.215Z","lastSeenAt":"2026-04-23T19:00:40.014Z"}],"details":{"listingId":"373d4278-4824-4739-a1bf-6ab63876eb05","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/49 \\\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":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/49"},{"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 platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/orders/49"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto quotes, gas estimates, and exchange rates on a per-request basis","Running geocoding or data validation calls with instant pay-per-use billing via USDC on Base"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost micro-transactions for diverse utility endpoints"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.008Z"},"updatedAt":"2026-04-23T19:00:40.014Z"}}