{"id":"45fa0bfc-d32c-44f5-8b24-b162d7bdf4bf","shortId":"FreeQB","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 marketplace that exposes a broad set 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, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/messages/182` is labeled \"Premium API Access\" and advertises a max cost of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call. Payment is made via an `X-PAYMENT` header following the x402 exact-payment scheme. No API keys or rate limits are required — callers simply attach a valid x402 payment header to each request. The endpoint accepts HTTP POST and returns `application/json`.\n\nDocumentation beyond the landing page is sparse: the /api, /pricing, and /README routes all resolve to a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The purpose of the `/messages/182` resource specifically is unclear — it may be a messaging or content retrieval endpoint, but this is not documented. Callers should experiment cautiously given the lack of schema information.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","json-response","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","low fee API","crypto API payments","402 payment required"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose of /api/v1/messages/182 ('Premium API Access') is not explained anywhere in the crawled content","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no useful content","No request or response examples are available; callers must experiment blind","The breadth of advertised endpoints (16+ across 4 categories) cannot be independently verified from the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/182","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/182","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no examples, and the specific purpose of /api/v1/messages/182 is undocumented. The /api, /pricing, and /README pages are all empty wallet-connect stubs. This is effectively a stub 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'/api/v1/messages/182':113 '/messages/182':226 '/pricing':192 '/readme':194 '/request':19,38 '0.02':18,37,95,131 '000':126 '20':125 '402 payment required' '6':136 'Base network API' 'USDC micropayment API' 'accept':177 'access':118 'across':54 'addit':205 'advertis':120 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,117,157 'application/json':182 'attach':166 'avail':221 'base':8,27,103,127 'beyond':184 'broad':50 'call':4,23,139 'caller':164,245 'categori':56 'cautious':248 'classif':71 'classification' 'connect':200 'content':237 'convers':88 'cost':123 'crypto API payments' 'data':11,30,57,61 'data-analytics' 'decim':137 'detail':207 'document':183,216,244 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,176,239 'estim':82 'exact':153 'exact-pay':152 'exampl':219 'exchang':77 'experi':247 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'follow':149 'four':55 'gas':81 'generat':89 'geocod':86 'geocoding' 'given':249 'header':148,171 'http':178 'http-post' 'inform':254 'infrastructur':84 'insight':63 'json-response' 'key':158 'label':115 'lack':251 'land':186 'learn':66 'limit':161 'low fee API' 'lowpaymentfee.com':39 'machin':65 'made':142 'marketplac':46 'max':122 'may':232 'messag':235 'metric':59 'network':104 'offer':10,29 'openapi':211 'page':187 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payload':220 'payment':140,147,154,170 'per':3,22,96,138 'platform':6,25 'post':179 'premium':116 'price':75,93 'prompt':202 'protocol':108 'purpos':223 'quot':80 'rate':78,160 'report':60 'request':97,174 'request/response':214 'requir':163 'resolv':197 'resourc':227 'retriev':238 'return':181 'rout':195 'schema':215,253 'scheme':155 'sentiment':67 'sentiment-analysis' 'set':51 'settl':98 'simpli':165 'sinc':133 'spars':189 'spec':212 'specif':110,228 'summar':70 'technic':206 'text':69 'text-summarization' 'token':79 'unclear':230 'unit':128 'usd':132 'usdc':9,28,100,130,134 'usdc-base' 'use':135 'util':15,34,85 'utility-apis' 'valid':87,168 'via':105,143 'wallet':201 'web3':74 'x':146 'x-payment':145 'x402':43,107,151,169 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"a7fc4c8d-2b5c-49a4-bf2e-273aa83dce6e","listingId":"45fa0bfc-d32c-44f5-8b24-b162d7bdf4bf","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/182","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.522Z"}],"sources":[{"listingId":"45fa0bfc-d32c-44f5-8b24-b162d7bdf4bf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/182","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.522Z","lastSeenAt":"2026-04-22T02:32:07.164Z"}],"details":{"listingId":"45fa0bfc-d32c-44f5-8b24-b162d7bdf4bf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/182 \\\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":"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 /api/v1/messages/182 endpoint returns a 402 challenge requiring 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/182"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key registration","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations like geocoding, validation, and data conversion with instant crypto-settled payments","Integrating pay-as-you-go data analytics into agent workflows"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse API endpoints","Developers prototyping with low-commitment, no-signup API access","Web3-native applications that can settle USDC payments on Base"],"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":"2026-02-17T23:13:00.974Z"},"updatedAt":"2026-04-22T02:32:07.164Z"}}