{"id":"788a01b5-44f6-4157-8f5f-d3a14bd3b2ac","shortId":"D57NLe","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 provides a broad catalog of pay-per-request 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/keys/84` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. It accepts POST requests and returns application/json. The platform advertises no API keys, no rate limits, and instant access — payment is the only authentication mechanism. There is no OpenAPI schema, detailed documentation, or example request/response bodies available from the crawled pages, so the exact input parameters and response format for this specific endpoint are unknown.\n\nThe platform's wallet-gated pages (pricing, README, API docs) did not yield additional content during crawling, which limits the ability to describe request schemas or response formats in detail. The endpoint is confirmed live via a valid x402 402 challenge.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","pay per call API","x402 API","USDC API","micropayment API","Base network API","cheap API access","per-request billing"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The exact purpose and input/output format of /api/v1/keys/84 is undocumented — 'Premium API Access' is ambiguous","Wallet-gated docs pages (pricing, README, API) returned no useful content","No examples of request bodies or response payloads could be found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/84","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/keys/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and the landing page provides a catalog overview with pricing. However, there is no OpenAPI schema, no documentation of request/response formats, and wallet-gated pages yielded no content. The specific purpose of /api/v1/keys/84 ('Premium API Access') is vague and undocumented beyond its 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'/request':19,38 '0.02':18,37,99,139 '000':133 '20':132 '402':127,237 'Base network API' 'USDC API' 'abil':218 'accept':143 'access':123,160 'across':58 'addit':211 'advertis':151 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,122,153,206 'application/json':148 'authent':165 'avail':178 'base':8,27,107,134,141 'bodi':177 'broad':50 'call':4,23 'catalog':51 'categori':60 'challeng':128,238 'cheap API access' 'classif':75 'classification' 'confirm':231 'content':212 'convers':92 'conversion' 'crawl':181,214 'crypto-quotes' 'data':11,30,61,65 'data-analytics' 'describ':220 'detail':172,227 'doc':207 'document':173 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,115,194,229 'estim':86 'exact':185 'exampl':175 'exchang':81 'export':66 'feed':80 'financ':13,32,77 'finance-data' 'format':190,225 'four':59 'gas':85 'gas-estimates' 'gate':202 'generat':93 'geocod':90 'geocoding' 'i.e':138 'infrastructur':88 'input':186 'insight':67 'instant':159 'key':154 'learn':70 'limit':157,216 'list':119 'live':232 'low payment fee' 'lowpaymentfee.com':39 'machin':69 'mechan':166 'metric':63 'micropayment API' 'network':108 'offer':10,29 'openapi':170 'page':182,203 'paramet':187 'pay':2,21,54 'pay per call API' 'pay-per-cal':1,20 'pay-per-request':53 'payment':161 'per':3,22,55,100 'per-request billing' 'platform':6,25,46,150,198 'post':144 'premium':121 'price':79,97,204 'protocol':112 'provid':48 'quot':84 'rate':82,156 'readm':205 'report':64 'request':56,101,129,145,221 'request/response':176 'respons':189,224 'return':125,147 'schema':171,222 'sentiment':71 'sentiment-analysis' 'settl':102 'specif':114,193 'summar':74 'text':73 'text-summarization' 'token':83 'unit':135 'unknown':196 'usdc':9,28,104,137 'usdc-base' 'util':15,34,89 'valid':91,235 'validation' 'via':109,233 'wallet':201 'wallet-g':200 'web3':78 'x402':43,111,236 'x402 API' 'x402-enabled':42 'x402-payment' 'yield':210","prices":[{"id":"91f46689-acb5-494b-b537-869601183b55","listingId":"788a01b5-44f6-4157-8f5f-d3a14bd3b2ac","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/keys/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.820Z"}],"sources":[{"listingId":"788a01b5-44f6-4157-8f5f-d3a14bd3b2ac","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/84","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.820Z","lastSeenAt":"2026-04-22T01:02:19.249Z"}],"details":{"listingId":"788a01b5-44f6-4157-8f5f-d3a14bd3b2ac","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/84 \\\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":"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/keys/84 endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/84"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Payment asset is USDC at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/84"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) on a per-call basis without subscriptions","Fetching real-time crypto token quotes and gas estimates for DeFi applications","Running geocoding or data validation as lightweight utility calls","Exporting analytics data or generating reports with pay-as-you-go pricing","Integrating low-cost API calls into autonomous agents via x402 payment protocol"],"bestFor":["Developers or agents needing low-cost, no-signup API access","x402-compatible autonomous agents that settle payments in USDC on Base","Prototyping and low-volume use cases where per-request pricing is economical"],"notFor":["High-volume production workloads where subscription pricing would be cheaper","Users who need detailed SLAs, rate-limit guarantees, or enterprise support","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.147Z"},"updatedAt":"2026-04-22T01:02:19.249Z"}}