{"id":"6c24da54-ba95-4acc-adf9-efe6e1db64dc","shortId":"cFZPsg","kind":"x402","title":"Pay-per-request API platform on Base (USDC) via x402 — $0.02/call, no API keys required.","tagline":"Pay-per-request API platform on Base (USDC) via x402 — $0.02/call, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/inbox/172` is listed as \"Premium API Access\" and costs up to $0.02 per request (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). Payment is made inline via the X-PAYMENT header — no API keys, accounts, or rate limits are required.\n\nThe broader platform advertises multiple API categories including 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.\n\nThis particular endpoint (`/api/v1/inbox/172`) is labeled generically as \"Premium API Access\" and does not appear in the main category listings on the homepage. Its exact functionality is unclear — it accepts POST requests and returns `application/json`, but no input schema, documentation, or example responses are available. The platform's /api, /pricing, and /README pages all resolve to a minimal \"Connect wallet\" prompt with no additional documentation.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","micropayment API","x402 API","USDC pay-per-call","Base network API","paywall API","402 payment API"],"warnings":["No documentation available for this specific endpoint — its purpose and expected input/output are unknown","The endpoint path '/api/v1/inbox/172' does not appear in the platform's public API listings","All documentation pages (/api, /pricing, /README) resolve to a minimal 'Connect wallet' page with no content","No input schema or example responses are provided anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/172","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/172","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no input/output schema, no examples, and the specific purpose of /api/v1/inbox/172 is undefined. The /api, /pricing, and /README pages are all empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/inbox/172':60,157 '/call':13,30 '/pricing':203 '/readme':205 '0.02':12,29,71,85,151 '000':77 '20':76 '402 payment API' '6':83 'Base network API' 'USDC pay-per-call' 'accept':50,183 'access':66,164 'account':99 'addit':217 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':5,15,22,32,42,65,97,110,163 'appear':168 'application/json':188 'avail':198 'base':8,25,55,78 'broader':106 'categori':111,172 'classif':127 'connect':212 'convers':144 'cost':68 'data':113,117 'decim':84 'document':193,218 'embed':128 'endpoint':59,147,156 'estim':138 'exact':178 'exampl':195 'exchang':133 'export':118 'feed':132 'financ':129 'function':179 'gas':137 'generat':145 'generic':160 'geocod':142 'header':95 'homepag':176 'includ':112 'infrastructur':140 'inlin':89 'input':191 'insight':119 'json-response' 'key':16,33,98 'label':159 'learn':122 'limit':102 'list':62,173 'low payment fee' 'lowpaymentfee.com':35 'machin':121 'made':88 'main':171 'maxamountrequir':74 'metric':115 'micropayment API' 'minim':211 'multipl':109 'network':56 'no-api-key' 'page':206 'particular':155 'pay':2,19,39 'pay-per-request':1,18,38 'payment':52,86,94 'paywall API' 'per':3,20,40,72,152 'platform':6,23,43,107,200 'post':184 'post-method' 'premium':64,162 'price':131,149 'prompt':214 'protocol':48 'quot':136 'rate':101,134 'report':116 'request':4,21,41,73,153,185 'requir':17,34,104 'resolv':208 'respons':196 'return':187 'schema':192 'sentiment':123 'specif':58 'summar':126 'text':125 'token':135 'unclear':181 'unit':79 'usdc':9,26,51,81 'usdc-base-network' 'use':45 'util':141 'valid':143 'via':10,27,90 'wallet':213 'web3':130 'x':93 'x-payment':92 'x402':11,28,47 'x402 API' 'x402-payment'","prices":[{"id":"daf79271-be19-4c2d-9ea3-850ce4b0346c","listingId":"6c24da54-ba95-4acc-adf9-efe6e1db64dc","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/172","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.828Z"}],"sources":[{"listingId":"6c24da54-ba95-4acc-adf9-efe6e1db64dc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/172","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.828Z","lastSeenAt":"2026-04-22T05:32:22.895Z"}],"details":{"listingId":"6c24da54-ba95-4acc-adf9-efe6e1db64dc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/172 \\\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/172"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/172"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Multiple API categories listed: Data & Analytics, AI & ML, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to an inbox or messaging endpoint behind a payment wall"],"bestFor":["Developers who want zero-signup, pay-per-use API access","AI agents with Base USDC wallets needing on-demand endpoints","Users comfortable with x402 payment protocol on Base"],"notFor":["Users who need detailed API documentation or schemas before integrating","Anyone without a Base-compatible USDC wallet","High-volume use cases where per-request pricing at $0.02 adds up quickly"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.847Z"},"updatedAt":"2026-04-22T05:32:22.895Z"}}