{"id":"c7e1c3c3-10d9-47d3-99a8-f0c978c7146f","shortId":"PN9xPA","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that exposes a broad catalog of 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, payable in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint `/api/v1/messages/125` is listed as \"Premium API Access\" and was confirmed live via a 402 challenge. Its maxAmountRequired is 20,000 base units of USDC (6 decimals), which equals $0.02. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, with a 300-second timeout. The endpoint accepts HTTP POST requests and returns `application/json`.\n\nDocumentation beyond the landing page is sparse — the /api, /pricing, and /README routes all resolve to a wallet-connect prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled pages. The exact functionality of the `/api/v1/messages/125` endpoint is unclear; the name \"Premium API Access\" and the `/messages/` path suggest it may be a messaging or content retrieval endpoint, but this cannot be confirmed from available material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 API","pay per call API","USDC API","Base network API","micropayment API","cheap API","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The exact functionality of /api/v1/messages/125 is unclear — 'Premium API Access' is a generic label","All documentation pages (/api, /pricing, /README) resolve to a wallet-connect prompt with no content","No request body schema or response examples are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/125","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/messages/125","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 via a valid 402 challenge and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no usage examples, and the specific purpose of /api/v1/messages/125 is undocumented. The broader platform lists many endpoints but provides no technical documentation for any of 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'/api/v1/messages/125':122,222 '/messages':233 '/pricing':182 '/readme':184 '/request':19,38 '0.02':18,37,95,150 '000':141 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':156 '20':140 '300':161 '402':135 '6':146 'Base network API' 'USDC API' 'accept':166 'access':128,230 'across':54 'addit':196 'address':155 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,110,127,229 'application/json':172 'avail':212,251 'base':8,27,103,142,158 'beyond':174 'broad':50 'call':4,23 'cannot':247 'catalog':51 'categori':56 'challeng':136 'cheap API' 'classif':71 'classification' 'commit':118 'confirm':131,249 'connect':192 'content':242 'convers':88 'crawl':215 'crypto-paid API' 'data':11,30,57,61 'data-analytics' 'decim':147 'detail':198 'document':173,207 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,121,165,223,244 'equal':149 'estim':82 'exact':218 'exampl':211 'exchang':77 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':219 'gas':81 'generat':89 'geocod':86 'geocoding' 'http':167 'infrastructur':84 'insight':63 'key':111 'land':176 'learn':66 'limit':114 'list':124 'live':132 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':153 'materi':252 'maxamountrequir':138 'may':237 'messag':240 'metric':59 'micropayment API' 'name':227 'network':104 'offer':10,29 'openapi':202 'page':177,216 'path':234 'pay':2,21 'pay per call API' 'pay-per-cal':1,20 'pay-per-request' 'payabl':98 'payment':151 'per':3,22,96 'platform':6,25,46 'post':168 'premium':126,228 'price':75,93 'prompt':193 'protocol':108 'quot':80 'rate':78,113 'report':60 'request':97,169 'request/response':205 'resolv':187 'retriev':243 'return':171 'rout':185 'schema':206 'second':162 'sentiment':67 'sentiment-analysis' 'spars':179 'spec':203 'specif':120 'suggest':235 'summar':70 'technic':197 'text':69 'text-summarization' 'timeout':163 'token':79 'unclear':225 'unit':143 'upfront':117 'usag':210 'usdc':9,28,100,145 'usdc-base' 'util':15,34,85 'utility-apis' 'valid':87 'via':105,133 'wallet':191 'wallet-connect':190 'web3':74 'x402':43,107 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"a9aba595-a25b-4fe5-8d4f-e29d68f1ccc6","listingId":"c7e1c3c3-10d9-47d3-99a8-f0c978c7146f","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/messages/125","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.797Z"}],"sources":[{"listingId":"c7e1c3c3-10d9-47d3-99a8-f0c978c7146f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/125","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.797Z","lastSeenAt":"2026-04-22T05:32:15.497Z"}],"details":{"listingId":"c7e1c3c3-10d9-47d3-99a8-f0c978c7146f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/125 \\\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 platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/messages/125"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"}],"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 data analytics queries and exporting reports on a pay-as-you-go basis","Geocoding and data validation via utility endpoints with no subscription required"],"bestFor":["Developers wanting zero-friction, keyless API access paid in crypto","Agents or bots that need programmatic pay-per-call access on Base","Projects needing low-cost ($0.02) micro-transactions for diverse API services"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:02.012Z"},"updatedAt":"2026-04-22T05:32:15.497Z"}}