{"id":"9ad401f0-c458-4fc6-9ed9-47a93c137449","shortId":"jP8RHw","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, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/messages/26` is labeled \"Premium API Access\" and advertises a maximum 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 using the x402 exact scheme. No API keys or rate limits are required — callers simply attach a valid x402 payment header to each request.\n\nDocumentation beyond the landing page is sparse: the /api, /pricing, and /README routes all return only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The purpose of the `/api/v1/messages/26` endpoint specifically is unclear — it could be a messaging or content retrieval endpoint, but this is not documented.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","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","micropayment api","usdc api","base network api","cheap api","no api key"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose and expected input/output of /api/v1/messages/26 is undocumented","All non-root pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","No request or response examples available — integration requires trial and error"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/26","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/26","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 accepts USDC payments on Base at $0.02/call. However, there is no OpenAPI spec, no request/response schema, no usage examples, and the specific purpose of /api/v1/messages/26 is undocumented. The broader site lists many endpoints but provides no technical documentation for any of 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'/api/v1/messages/26':113,220 '/pricing':182 '/readme':184 '/request':19,38 '0.02':18,37,95,131 '000':126 '20':125 '6':136 'access':118 'across':54 'advertis':120 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,117,155 'attach':164 'avail':211 'base':8,27,103,127 'base network api' 'base-network' 'beyond':174 'broad':50 'call':4,23,139 'caller':162 'catalog':51 'categori':56 'cheap api' 'classif':71 'classification' 'connect':190 'content':231 'convers':88 'cost':123 'could':226 'crawl':214 'data':11,30,57,61 'data-analytics' 'decim':137 'detail':197 'document':173,206,238 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,221,233 'estim':82 'exact':152 'exampl':210 'exchang':77 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'gas':81 'generat':89 'geocod':86 'geocoding' 'header':148,169 'infrastructur':84 'insight':63 'key':156 'label':115 'land':176 'learn':66 'limit':159 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':142 'materi':215 'maximum':122 'messag':229 'metric':59 'micropayment api' 'network':104 'no api key' 'offer':10,29 'openapi':201 'page':177 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':140,147,168 'per':3,22,96,138 'platform':6,25,46 'premium':116 'price':75,93 'prompt':192 'protocol':108 'purpos':217 'quot':80 'rate':78,158 'report':60 'request':97,172 'request/response':204 'requir':161 'retriev':232 'return':187 'rout':185 'schema':205 'scheme':153 'sentiment':67 'sentiment-analysis' 'settl':98 'simpli':163 'sinc':133 'spars':179 'spec':202 'specif':110,222 'summar':70 'technic':196 'text':69 'text-summarization' 'token':79 'unclear':224 'unit':128 'usag':209 'usd':132 'usdc':9,28,100,130,134 'usdc api' 'usdc-settlement' 'use':135,149 'util':15,34,85 'utility-apis' 'valid':87,166 'via':105,143 'wallet':191 'web3':74 'x':146 'x-payment':145 'x402':43,107,151,167 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"35a7e09c-fd8e-4fe9-9ae1-e5bebde61cb6","listingId":"9ad401f0-c458-4fc6-9ed9-47a93c137449","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/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.490Z"}],"sources":[{"listingId":"9ad401f0-c458-4fc6-9ed9-47a93c137449","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/26","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.490Z","lastSeenAt":"2026-04-22T02:32:07.120Z"}],"details":{"listingId":"9ad401f0-c458-4fc6-9ed9-47a93c137449","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/26 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\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 maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/26"},{"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 platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/26"}],"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 payment basis","Integrating pay-per-use data analytics and reporting into agent workflows"],"bestFor":["AI agents that need low-friction, keyless API access with crypto micropayments","Developers prototyping with multiple API categories without subscription commitments","Web3-native applications that can settle payments in USDC on Base"],"notFor":["Users who need detailed API documentation, schemas, or guaranteed SLAs before integrating","High-volume production workloads where subscription-based pricing would be more cost-effective","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.007Z"},"updatedAt":"2026-04-22T02:32:07.120Z"}}