{"id":"bb0d13e5-b60d-42c7-a653-0fce18f6dc39","shortId":"YxVEhN","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 hosts 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, payable in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/inbox/96` is listed as \"Premium API Access\" and its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme with a 300-second timeout. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nNote that the specific functionality behind the `/api/v1/inbox/96` path is not documented on the site's landing page, which lists other named endpoints but not this one. The crawled /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no additional documentation. Without an OpenAPI spec or detailed docs, the exact request/response schema for this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","no-rate-limit","data-analytics","ai-inference","finance-data","web3-data","utility-services","geocoding","sentiment-analysis","text-summarization","embeddings"],"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","crypto api access"],"warnings":["The specific endpoint /api/v1/inbox/96 is not listed among the named endpoints on the landing page — its purpose is unclear.","No OpenAPI spec, request schema, or response schema is available for any endpoint.","The /api, /pricing, and /README pages returned no useful content (only 'Connect wallet').","The broad catalog of endpoints listed on the homepage could not be individually verified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/96","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/96","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documentation for this specific path (/api/v1/inbox/96), no request/response schema, and the crawled pages beyond the landing page returned only wallet-connect prompts. The actual functionality of this endpoint is 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'/api/v1/inbox/96':116,190 '/pricing':213 '/readme':215 '/request':19,38 '0.02':18,37,99,143 '000':132 '0x8335':137 '20':131 '2913':138 '300':158 '402 payment api' '6':147 'access':122 'across':58 'addit':226 'advertis':127 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,121,162 'attach':171 'base':8,27,107,133,140 'base network api' 'behind':188 'broad':50 'call':4,23 'caller':169 'catalog':51 'categori':60 'challeng':126 'classif':75 'connect':221 'convers':92 'crawl':211 'crypto api access' 'data':11,30,61,65 'data-analytics' 'decim':148 'detail':233 'doc':234 'document':194,227 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,115,205,241 'equal':142 'estim':86 'exact':154,236 'exchang':81 'export':66 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'function':187 'gas':85 'generat':93 'geocod':90 'geocoding' 'given':144 'header':176 'host':48 'infrastructur':88 'insight':67 'key':163 'land':199 'learn':70 'limit':166 'list':118,202 'low payment fee' 'lowpaymentfee.com':39 'machin':69 'made':151 'maxamountrequir':129 'metric':63 'micropayment api' 'name':204 'network':108 'no-api-key' 'no-rate-limit' 'note':183 'offer':10,29 'one':209 'openapi':230 'page':200,216 'path':191 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payabl':102 'payment':149,175,181 'per':3,22,55,100 'platform':6,25,46 'premium':120 'price':79,97 'prompt':223 'proof':182 'protocol':112 'quot':84 'rate':82,165 'report':64 'request':56,101 'request/response':237 'requir':168 'return':218 'schema':238 'scheme':155 'second':159 'sentiment':71 'sentiment-analysis' 'simpli':170 'site':197 'spec':231 'specif':114,186 'summar':74 'text':73 'text-summarization' 'timeout':160 'token':83 'unit':134 'unknown':243 'usdc':9,28,104,136,145 'usdc api' 'usdc-base' 'util':15,34,89 'utility-services' 'valid':91,179 'via':109,152 'wallet':222 'web3':78 'web3-data' 'without':228 'x':174 'x-payment':173 'x402':43,111,125,180 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"48943eda-7d66-4e14-ab8f-627a82f38dfc","listingId":"bb0d13e5-b60d-42c7-a653-0fce18f6dc39","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/96","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.615Z"}],"sources":[{"listingId":"bb0d13e5-b60d-42c7-a653-0fce18f6dc39","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/96","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.615Z","lastSeenAt":"2026-04-22T04:02:46.038Z"}],"details":{"listingId":"bb0d13e5-b60d-42c7-a653-0fce18f6dc39","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/96 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\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/inbox/96 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with exact scheme.","source_url":"https://lowpaymentfee.com/api/v1/inbox/96"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running geocoding, validation, or data conversion tasks with instant crypto-settled micropayments","Exporting analytics data or generating insights reports via pay-as-you-go endpoints"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost micropayment-gated endpoints without subscriptions"],"notFor":["Users who need high-volume bulk pricing or enterprise SLAs","Callers without USDC on the Base network or x402-compatible payment infrastructure","Applications requiring detailed API documentation or guaranteed uptime guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.113Z"},"updatedAt":"2026-04-22T04:02:46.038Z"}}