{"id":"8f19c28e-2cbf-4eef-b986-1406ba9fd71b","shortId":"BWM8xS","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/77` is listed as \"Premium API Access\" and was probed live, returning a valid 402 challenge. Its `maxAmountRequired` is 20000 base units of USDC (6 decimals), which equals $0.02. Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" scheme with a 300-second timeout. 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 content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The purpose of the `/api/v1/messages/77` path specifically (as opposed to the other listed endpoints) is unclear; it may be a generic message or content retrieval endpoint, but this is not documented.","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","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose of /api/v1/messages/77 ('Premium API Access') is not explained anywhere","All sub-pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no useful content","No request body schema or response examples are documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/77","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/77","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 pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no usage examples, and the specific purpose of /api/v1/messages/77 is undocumented. The landing page lists many endpoints but provides no detail on inputs or outputs for any of 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'/api/v1/messages/77':122,218 '/pricing':186 '/readme':188 '/request':19,38 '0.02':18,37,95,150 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':159 '20000':141 '300':166 '402':136 '6':146 'accept':171 'access':128 'across':54 'addit':199 'address':158 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,110,127 'application/json':176 'base':8,27,103,142 'base network api' 'beyond':178 'broad':50 'call':4,23 'catalog':51 'categori':56 'chain':156 'challeng':137 'classif':71 'classification' 'commit':118 'connect':194 'content':200,237 'convers':88 'data':11,30,57,61 'data-analytics' 'decim':147 'document':177,209,244 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,121,170,227,239 'equal':149 'estim':82 'exact':162 'exampl':213 'exchang':77 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'gas':81 'generat':89 'generic':234 'geocod':86 'geocoding' 'http':172 'infrastructur':84 'insight':63 'key':111 'land':180 'learn':66 'limit':114 'list':124,226 'live':132 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':65 'maxamountrequir':139 'may':231 'messag':235 'metric':59 'micropayment api' 'network':104 'offer':10,29 'on-chain':154 'openapi':204 'oppos':222 'page':181 'path':219 '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':173 'premium':126 'price':75,93 'probe':131 'prompt':196 'protocol':108 'purpos':215 'quot':80 'rate':78,113 'report':60 'request':97 'request/response':207 'resolv':191 'retriev':238 'return':133,175 'rout':189 'schema':208 'scheme':163 'second':167 'sentiment':67 'sentiment-analysis' 'settl':153 'spars':183 'spec':205 'specif':120,220 'summar':70 'text':69 'text-summarization' 'timeout':168 'token':79 'unclear':229 'unit':143 'upfront':117 'usag':212 'usdc':9,28,100,145 'usdc api' 'usdc-base' 'use':160 'util':15,34,85 'utility-apis' 'valid':87,135 'via':105 'wallet':195 'web3':74 'x402':43,107 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"1f280f52-59a8-4ce9-88b1-23985c10918a","listingId":"8f19c28e-2cbf-4eef-b986-1406ba9fd71b","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/77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.065Z"}],"sources":[{"listingId":"8f19c28e-2cbf-4eef-b986-1406ba9fd71b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/77","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.065Z","lastSeenAt":"2026-04-22T02:32:08.129Z"}],"details":{"listingId":"8f19c28e-2cbf-4eef-b986-1406ba9fd71b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/77 \\\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 endpoint /api/v1/messages/77 returns a 402 challenge with maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/77"},{"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 management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates","Running utility operations like geocoding, validation, and data conversion on a per-call basis","Integrating pay-per-use data analytics and reporting into agent workflows"],"bestFor":["Agents or developers wanting zero-signup, pay-per-call API access","Lightweight, low-cost AI inference tasks ($0.02/call)","Quick prototyping without rate limits or subscription commitments"],"notFor":["High-volume production workloads where $0.02/call adds up significantly","Users who need detailed API documentation, SDKs, or guaranteed SLAs","Applications requiring non-USDC or non-Base-network payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.053Z"},"updatedAt":"2026-04-22T02:32:08.129Z"}}