{"id":"fefe9e35-d9ea-43e7-8246-dff1507e6b07","shortId":"DZSSsD","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 `/api/v1/messages/81` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts HTTP POST requests and returns application/json responses.\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 content. The exact functionality behind the `/api/v1/messages/81` path is unclear; it may be a messaging or content retrieval endpoint, but this is not confirmed by the 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","402 payment api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The exact functionality of /api/v1/messages/81 ('Premium API Access') is not described anywhere in the crawled content","All documentation pages (/api, /pricing, /README) resolve only to a wallet-connect prompt with no content","No request body schema or response examples are available — integration requires trial and error"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/81","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/81","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 network. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/messages/81 is unclear. The platform appears to be a broad catalog with minimal technical detail 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'/api/v1/messages/81':112,221 '/pricing':181 '/readme':183 '/request':19,38 '0.02':18,37,95,133 '000':128 '20':127 '402':122 '402 payment api' '6':138 'accept':164 'access':118 'across':54 'addit':195 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,117,152 'application/json':170 'avail':211,241 'base':8,27,103,129,141 'base network api' 'behind':219 'beyond':173 'broad':50 'call':4,23 'catalog':51 'categori':56 'challeng':123 'classif':71 'classification' 'commit':160 'confirm':238 'connect':191 'content':215,231 'convers':88 'crawl':214 'data':11,30,57,61 'data-analytics' 'decim':139 'detail':197 'document':172,206 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,163,233 'estim':82 'exact':148,217 'exampl':210 'exchang':77 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':218 'gas':81 'generat':89 'geocod':86 'geocoding' 'http':165 'infrastructur':84 'insight':63 'key':153 'land':175 'learn':66 'limit':156 'list':114 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':144 'materi':242 'may':226 'messag':229 'metric':59 'micropayment api' 'network':104 'offer':10,29 'openapi':201 'page':176 'path':222 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':142 'per':3,22,96 'platform':6,25,46 'post':166 'premium':116 'price':75,93 'prompt':192 'protocol':108 'quot':80 'rate':78,155 'report':60 'request':97,124,167 'request/response':204 'requir':161 'resolv':186 'respons':171 'retriev':232 'return':120,169 'rout':184 'schema':205 'scheme':149 'sentiment':67 'sentiment-analysis' 'settl':98 'sinc':135 'spars':178 'spec':202 'specif':110 'summar':70 'technic':196 'text':69 'text-summarization' 'token':79 'unclear':224 'unit':130 'upfront':159 'usag':209 'usd':134 'usdc':9,28,100,132,136 'usdc api' 'usdc-base' 'use':137 'util':15,34,85 'utility-apis' 'valid':87 'via':105,145 'wallet':190 'wallet-connect':189 'web3':74 'x402':43,107,147 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"4c297dad-0688-4725-bd75-f0c6f3757296","listingId":"fefe9e35-d9ea-43e7-8246-dff1507e6b07","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.270Z"}],"sources":[{"listingId":"fefe9e35-d9ea-43e7-8246-dff1507e6b07","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.270Z","lastSeenAt":"2026-04-22T02:32:08.348Z"}],"details":{"listingId":"fefe9e35-d9ea-43e7-8246-dff1507e6b07","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/81 \\\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 x402 challenge for /api/v1/messages/81 requests up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/81"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","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, exchange rates, and gas estimates","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":["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 or OpenAPI specs before integrating","High-volume production workloads that benefit from bulk pricing or rate-limit guarantees","Teams that cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.714Z"},"updatedAt":"2026-04-22T02:32:08.348Z"}}