{"id":"0931c674-0cdf-4626-9660-16d248e237a9","shortId":"PymXrg","kind":"x402","title":"Pay-per-request API platform on Base via x402 — $0.02/call in USDC, no keys required.","tagline":"Pay-per-request API platform on Base via x402 — $0.02/call in USDC, no keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network. There are no API keys, no rate limits, and no sign-up — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/inbox/188` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises endpoints for 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, request/response examples, or detailed documentation were found during crawling; the docs, pricing, and README pages all resolve to a wallet-connect prompt with no further content. The exact functionality of the `/api/v1/inbox/188` endpoint specifically is unclear from available materials.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","post-endpoint","data-analytics","ai-inference","finance-data","web3-data","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api","crypto pay api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The exact functionality of /api/v1/inbox/188 is undocumented — 'Premium API Access' is the only description","Docs, pricing, and README pages return only a wallet-connect prompt with no useful content","No request or response examples could be found or inferred","The broad catalog of endpoints listed on the homepage could not be individually verified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/188","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/inbox/188","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 pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing. The specific purpose of /api/v1/inbox/188 ('Premium API Access') is not explained anywhere. Docs, pricing, and README pages all resolve to a wallet-connect stub with no 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'/call':12,29 '0.02':11,28,66,134,184 '000':123 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':149 '0x8335':128 '20':122 '2913':129 '300':152 '6':138 'accept':111 'access':109 'across':54 'address':148 'advertis':117,158 'ai-inference' 'ai/ml':57 'amount':120 'analysi':162 'analyt':56 'api':5,22,41,79,108 'attach':91 'avail':229 'base':8,25,74,124,131 'base network api' 'broad':46 'broader':156 'caller':89 'catalog':47 'chain':146 'challeng':116 'classif':165 'connect':212 'content':217 'convers':177 'cost':65 'crawl':199 'crypto pay api' 'data':55 'data-analytics' 'decim':139 'detail':194 'doc':201 'document':195 'embed':166 'enabl':40 'endpoint':53,64,101,159,224 'equal':133 'estim':174 'everi':63 'exact':219 'exampl':192 'exchang':169 'feed':168 'finance-data' 'finance/web3':59 'found':197 'function':220 'gas':173 'generat':179 'geocod':175 'given':135 'header':95 'howev':187 'infer':58 'infrastructur':61 'key':16,33,80 'limit':83 'list':105 'low payment fee' 'lowpaymentfee.com':35 'materi':230 'maximum':119 'micropayment api' 'network':75 'no-api-key' 'no-auth api' 'offer':44 'on-chain':144 'openapi':189 'page':205 'paid':69 'pay':2,19,50 'pay per call api' 'pay-per-request':1,18,49 'payment':94,141 'per':3,20,51,67 'platform':6,23,42,157 'point':186 'post':112 'post-endpoint' 'premium':107 'price':167,185,202 'prompt':213 'quot':172 'rate':82,170 'readm':204 'request':4,21,52,68,98,113 'request/response':191 'requir':17,34 'resolv':207 'schema':190 'second':153 'sentiment':161 'settl':143 'sign':87 'sign-up':86 'simpli':90 'specif':100,225 'summar':164 'text':163 'timeout':154 'token':171 'unclear':227 'unit':125 'usdc':14,31,71,127,136 'usdc api' 'usdc-base' 'util':62 'utility-services' 'valid':176 'via':9,26 'wallet':211 'wallet-connect':210 'web3-data' 'x402':10,27,39,93,115 'x402 api' 'x402-enabled':38 'x402-payment'","prices":[{"id":"883ada38-686b-4f91-a21e-64443e1fdf71","listingId":"0931c674-0cdf-4626-9660-16d248e237a9","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/inbox/188","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.646Z"}],"sources":[{"listingId":"0931c674-0cdf-4626-9660-16d248e237a9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/188","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.646Z","lastSeenAt":"2026-04-22T10:02:55.921Z"}],"details":{"listingId":"0931c674-0cdf-4626-9660-16d248e237a9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/188 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/188"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/188"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","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"}],"useCases":["Agents that need on-demand API access without pre-registration or API keys","Paying for individual AI inference calls (sentiment, summarization, classification) with USDC","Fetching real-time crypto quotes, gas estimates, or exchange rates per request","Geocoding or data validation as a utility microservice"],"bestFor":["AI agents and bots that can attach x402 payment headers automatically","Developers who want zero-friction, keyless API access on Base","Low-volume or bursty workloads where per-call pricing is preferable to subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users who need detailed API documentation or guaranteed SLAs before integrating","Callers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.619Z"},"updatedAt":"2026-04-22T10:02:55.921Z"}}