{"id":"13630e71-2e50-4366-ad8e-adb41421ff8f","shortId":"xaQ6MU","kind":"x402","title":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com is a multi-category API platform that uses the x402 payment protocol on the Base network to charge per request in USDC. The specific endpoint `/api/v1/orders/4` is labeled \"Premium API Access\" and accepts POST requests with a maximum cost of 20,000 base units of USDC (i.e., $0.02 per call, since USDC uses 6 decimals). No API keys or rate limits are advertised — callers simply attach an x402 payment header to each request.\n\nThe broader platform advertises four endpoint 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 listed endpoints share the same $0.02/request pricing. However, the crawled documentation pages (docs, pricing, README) returned only a wallet-connect prompt with no substantive content, so there is no schema documentation, example payloads, or detailed descriptions of what each endpoint actually returns.\n\nBecause the `/api/v1/orders/4` endpoint returned a well-formed 402 challenge with x402 version 1, the endpoint is confirmed live. Payment settles in USDC on Base to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The output schema indicates HTTP POST is the expected method and the endpoint is discoverable. Without further documentation, the exact request body format and response structure for this specific orders endpoint remain unknown.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","post-endpoint","no-api-key","no-rate-limit","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-marketplace","finance","llm","geo"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC micropayment API","Base network API","premium API access","micro-payment endpoint"],"warnings":["Documentation pages (/docs, /pricing, /README) contain no substantive content — only a wallet-connect prompt.","No OpenAPI or schema documentation is available; request body format and response structure are unknown.","The specific purpose of /api/v1/orders/4 ('Premium API Access') is not explained anywhere in the crawled material.","The broader platform advertises many endpoint categories but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/4","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages returned only a wallet-connect stub with no content. The purpose of the specific '/api/v1/orders/4' endpoint is unclear beyond its 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'/call':19,38 '/request':160 '0.02':18,37,88,159 '000':82 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':226 '1':212 '20':81 '402':207 '6':94 'Base network API' 'USDC micropayment API' 'accept':73 'access':71 'actual':196 'address':225 'advertis':103,117 'ai':12,31,128 'ai-inference' 'analysi':132 'analyt':122 'api':5,24,45,70,97 'attach':106 'base':8,27,55,83,223 'bodi':248 'broader':115 'call':90 'caller':104 'categori':44,120 'challeng':208 'charg':58 'classif':135 'confirm':216 'connect':175 'content':180 'convers':151 'cost':79 'crawl':164 'data':11,30,121,125 'data-analytics' 'decim':95 'descript':191 'detail':190 'discover':241 'doc':167 'document':165,186,244 'embed':136 'endpoint':16,35,65,119,155,195,201,214,239,257 'estim':146 'exact':246 'exampl':187 'exchang':141 'expect':235 'export':126 'feed':140 'financ':13,32,137 'finance-data' 'form':206 'format':249 'four':118 'gas':145 'generat':152 'geocod':149 'header':110 'howev':162 'http':231 'i.e':87 'indic':230 'infrastructure/utilities':148 'insight':127 'key':98 'label':68 'learn':130 'limit':101 'list':154 'live':217 'low payment fee' 'lowpaymentfee.com':39 'machin':129 'maximum':78 'method':236 'metric':123 'micro-payment endpoint' 'multi':43 'multi-categori':42 'network':56 'no-api-key' 'no-rate-limit' 'order':256 'output':228 'page':166 'pay':2,21 'pay-per-call API' 'pay-per-request':1,20 'payload':188 'payment':51,109,218 'per':3,22,59,89 'per-request-billing' 'platform':46,116 'post':74,232 'post-endpoint' 'premium':69 'premium API access' 'price':139,161,168 'prompt':176 'protocol':52 'quot':144 'rate':100,142 'readm':169 'remain':258 'report':124 'request':4,23,60,75,113,247 'respons':251 'return':170,197,202 'schema':185,229 'sentiment':131 'settl':219 'share':156 'simpli':105 'sinc':91 'specif':64,255 'structur':252 'substant':179 'suit':6,25 'summar':134 'text':133 'token':143 'unit':84 'unknown':259 'usdc':62,86,92,221 'usdc-base' 'use':48,93 'util':15,34 'utility-services' 'valid':150 'version':211 'via':9,28 'wallet':174 'wallet-connect':173 'web3':138 'well':205 'well-form':204 'without':242 'x402':10,29,50,108,210 'x402 API' 'x402-payment'","prices":[{"id":"d5dfe177-fe3b-4de5-a588-32cf44b1d669","listingId":"13630e71-2e50-4366-ad8e-adb41421ff8f","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:26.781Z"}],"sources":[{"listingId":"13630e71-2e50-4366-ad8e-adb41421ff8f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/4","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:26.781Z","lastSeenAt":"2026-04-23T10:30:30.230Z"}],"details":{"listingId":"13630e71-2e50-4366-ad8e-adb41421ff8f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/4 \\\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 402 challenge with x402 version 1, maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/4"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/orders/4"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing data analytics and reports on a pay-per-request basis without subscriptions","Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-call USDC payments","Fetching real-time crypto prices, gas estimates, and exchange rates","Geocoding, validation, and data conversion via utility endpoints"],"bestFor":["Developers who want instant API access without signup or API keys","Agents and bots that can settle payments programmatically via x402 on Base","Low-volume or bursty workloads where per-call pricing is more economical than subscriptions"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without a Base-compatible USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.842Z"},"updatedAt":"2026-04-23T10:30:30.230Z"}}