{"id":"ec1dad19-1145-46a8-b15a-3ff65162ac90","shortId":"KGyDu5","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/94` is listed as \"Premium API Access.\" Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts HTTP POST and returns `application/json`. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nThe broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads were found during crawling; the docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no further content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["llm","data","finance","geo"],"synonyms":["low payment fee API","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","cheap API calls"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior must be discovered experimentally.","The specific purpose of /api/v1/messages/94 ('Premium API Access') is not explained anywhere in the crawled content.","Docs, pricing, and README pages returned only 'Connect wallet' with no substantive content.","No example request or response payloads are available to confirm what this endpoint actually returns."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/94","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/94","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and network details, but there is no OpenAPI schema, no documentation beyond a landing page listing, no example requests or responses, and the specific purpose of /api/v1/messages/94 is unclear. Most detail is inferred from the homepage 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'/request':18,36 '0.02':17,35,68,131,185 '000':120 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':149 '0x8335':125 '20':119 '2913':126 '300':152 '6':135 'Base network API' 'USDC API' 'accept':139 'access':110 'addit':159 'advertis':114,158 'ai':12,30,55 'ai-inference' 'analysi':163 'analyt':54 'api':5,23,43,81,109 'application/json':144 'attach':92 'base':8,26,76,121,128 'broad':48 'broader':156 'call':4,22 'caller':90 'challeng':113 'cheap API calls' 'classif':166 'classification' 'collect':49 'commit':89 'connect':212 'content':218 'convers':178 'cost':117 'cover':10,28 'crawl':201 'crypto-quotes' 'data':11,29,53 'data-analytics' 'decim':136 'detail':192 'doc':203 'document':193 'embed':167 'embeddings' 'enabl':42 'endpoint':51,64,102,138,160 'equal':130 'estim':175 'everi':63 'exampl':195 'exchang':170 'feed':169 'financ':13,31,58 'finance-data' 'found':199 'gas':174 'generat':180 'geocod':176 'geocoding' 'given':132 'header':96 'howev':188 'http':140 'includ':161 'infrastructur':61 'key':82 'learn':57 'limit':85 'list':106 'low payment fee API' 'lowpaymentfee.com':37 'machin':56 'maximum':116 'micropayment API' 'minimum':88 'network':77 'offer':46 'openapi':190 'page':207 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payload':197 'payment':95,145 'per':3,21,69 'platform':44,157 'point':187 'post':141 'premium':108 'price':66,168,186,204 'prompt':214 'quot':173 'rate':84,171 'readm':206 'request':70,99 'request/response':196 'return':143,209 'schema':191 'second':153 'sent':147 'sentiment':162 'sentiment-analysis' 'settl':71 'simpli':91 'span':52 'specif':101 'suit':6,24 'summar':165 'text':164 'text-summarization' 'timeout':154 'token':172 'unit':122 'usdc':9,27,73,124,133 'usdc-base' 'util':15,33,62 'utility-services' 'valid':177 'wallet':213 'web3':59 'x402':41,94,112 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"75f25673-75e8-4511-9a48-5bc13625d36f","listingId":"ec1dad19-1145-46a8-b15a-3ff65162ac90","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/94","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.487Z"}],"sources":[{"listingId":"ec1dad19-1145-46a8-b15a-3ff65162ac90","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/94","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.487Z","lastSeenAt":"2026-04-22T02:32:08.606Z"}],"details":{"listingId":"ec1dad19-1145-46a8-b15a-3ff65162ac90","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/94 \\\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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/messages/94"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying real-time financial data (prices, exchange rates, gas estimates) without API key management","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis","Geocoding, data validation, and format conversion as lightweight utility calls","Agents autonomously purchasing API access via x402 payment protocol"],"bestFor":["AI agents that need frictionless, keyless API access with crypto micropayments","Developers prototyping with multiple API categories without subscription commitments","Low-volume or bursty workloads where pay-per-request is more economical than a subscription"],"notFor":["High-volume production workloads where bulk pricing or rate-limit guarantees are needed","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.327Z"},"updatedAt":"2026-04-22T02:32:08.606Z"}}