{"id":"2fd6ec40-24ea-40ac-809d-c27666376682","shortId":"huKWy5","kind":"x402","title":"Pay-per-request API platform on Base (USDC) via x402 — $0.02/call, no API keys required.","tagline":"Pay-per-request API platform on Base (USDC) via x402 — $0.02/call, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to gate access to a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Each call costs $0.02 in USDC on the Base network, with no API keys, rate limits, or upfront commitments required. Payment is handled inline via the x402 payment header.\n\nThe specific endpoint at `/api/v1/orders/51` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals) on Base. The 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).\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 spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is live and responds with a valid x402 challenge, but without documentation it is unclear what request body this specific `/api/v1/orders/51` endpoint expects or what it returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","validation"],"categories":["api-gateway","ai","finance","infrastructure"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet'","No OpenAPI or schema specification found for any endpoint","The specific function of /api/v1/orders/51 ('Premium API Access') is not documented; it is unclear what request body it expects or what it returns","The platform lists many endpoint categories on its landing page but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/51","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/51","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 it works. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The specific purpose of /api/v1/orders/51 is unclear beyond the generic 'Premium API Access' 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'/api/v1/orders/51':99,228 '/call':13,30 '/docs':171 '/pricing':173 '/readme':175 '0.02':12,29,69,121 '000':115 '20':114 '402':109 '402 payment API' '6':125 'Base network API' 'USDC API' 'access':51,105 'across':57 'advertis':131 'ai':141 'ai-inference' 'ai/ml':60 'analysi':145 'analyt':59,135 'api':5,15,22,32,42,78,104 'avail':201 'base':8,25,74,116,128 'bodi':225 'call':67 'categori':132 'challeng':110,216 'classif':148 'classification' 'commit':84 'connect':181 'content':187 'convers':164 'cost':68 'crawl':204 'data':58,134,138 'data-analytics' 'decim':126 'document':166,196,219 'embed':149 'embeddings' 'endpoint':56,97,207,229 'estim':159 'exampl':200 'exchang':154 'expect':230 'export':139 'extrem':168 'feed':153 'financ':150 'finance-data' 'finance/web3':62 'gas':158 'gate':50 'generat':165 'geocod':162 'geocoding' 'handl':88 'header':94 'i.e':120 'includ':133 'infer':61 'infrastructur':64,161 'inlin':89 'insight':140 'key':16,33,79 'learn':143 'limit':81 'list':101 'live':209 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':142 'materi':205 'metric':136 'micropayment API' 'network':75 'no-api-key' 'openapi':191 'page':176 'pay':2,19,39 'pay per call API' 'pay-per-request':1,18,38 'payment':86,93 'per':3,20,40 'platform':6,23,43,130 'premium':103 'price':152 'prompt':183 'protocol':48 'quot':157 'rate':80,155 'render':178 'report':137 'request':4,21,41,111,224 'request/response':194 'requir':17,34,85 'respond':211 'return':107,234 'schema':195 'sentiment':144 'sentiment-analysis' 'sinc':122 'spars':169 'spec':192 'specif':96,227 'summar':147 'text':146 'text-summarization' 'token':156 'unclear':222 'unit':117 'upfront':83 'usag':199 'usdc':9,26,71,119,123 'usdc-base' 'use':45,124 'util':65 'valid':163,214 'validation' 'varieti':54 'via':10,27,90 'wallet':182 'web3':151 'without':218 'x402':11,28,47,92,215 'x402 API' 'x402-payment'","prices":[{"id":"6b20c188-0e57-4d09-80e1-6cecd099fbab","listingId":"2fd6ec40-24ea-40ac-809d-c27666376682","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/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:50.632Z"}],"sources":[{"listingId":"2fd6ec40-24ea-40ac-809d-c27666376682","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/51","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:50.632Z","lastSeenAt":"2026-04-22T23:00:56.150Z"}],"details":{"listingId":"2fd6ec40-24ea-40ac-809d-c27666376682","quickStartSnippet":"# The endpoint requires an x402 payment header with USDC on Base.\n# 1. POST to the endpoint; receive a 402 challenge.\n# 2. Construct and sign an x402 payment for 20000 base units ($0.02 USDC).\n# 3. Re-send the POST with the X-PAYMENT header attached.\n\ncurl -X POST https://lowpaymentfee.com/api/v1/orders/51 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/51"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/51"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with per-request billing","Using utility services like geocoding, validation, and conversion without subscriptions"],"bestFor":["Agents or developers who want zero-setup, pay-as-you-go API access","Use cases requiring no rate limits and no upfront commitments","Crypto-native workflows already operating on Base with USDC"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","High-volume use cases where per-request pricing at $0.02 may be more expensive than subscription alternatives","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.571Z"},"updatedAt":"2026-04-22T23:00:56.150Z"}}