{"id":"b67a2b8c-9b32-4f5f-94e4-73ce7941476c","shortId":"sTAwAB","kind":"x402","title":"Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.","tagline":"Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every request costs $0.02 in USDC on the Base network, settled via the x402 payment protocol with no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/inbox/40` is listed as \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json. Beyond the generic \"Premium API Access\" label, no further documentation describes what this particular endpoint does — the provider's landing page does not list it among its named API categories.\n\nThe broader platform advertises endpoints in four groups: 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 (geocoding, validation, conversion, generation). All are priced identically at $0.02 per request. No OpenAPI schema, request/response examples, or detailed documentation were found during the crawl — the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-endpoint"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","usdc api","base network api","lowpaymentfee"],"warnings":["No documentation found for /api/v1/inbox/40 — its purpose is unknown beyond the label 'Premium API Access'","No OpenAPI or schema available for any endpoint on the platform","The /api, /pricing, and /README pages returned no useful content (only 'Connect wallet')","This endpoint is not listed among the named APIs on the provider's landing page"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/40","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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no documentation for what /api/v1/inbox/40 actually does, no OpenAPI schema, no request/response examples, and the crawled docs pages are empty. The listing is essentially a stub with only the x402 challenge metadata to work 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'/api/v1/inbox/40':87 '/pricing':221 '/readme':223 '/request':11,26 '0.02':10,25,59,114,203 '000':102 '0x8335':108 '20':101 '2913':109 '6':118 'accept':122 'access':93,133 'advertis':97,161 'ai':173 'ai/ml':49 'among':153 'analysi':177 'analyt':48,167 'api':5,20,37,74,92,132,156 'application/json':127 'asset':107 'base':8,23,64,103,111 'base network api' 'beyond':128 'broad':42 'broader':159 'call':4,19 'categori':157 'challeng':96 'classif':180 'collect':43 'commit':82 'connect':229 'content':235 'convers':196 'cost':58 'crawl':218 'data':47,52,166,170 'decim':119 'describ':138 'detail':212 'document':137,213 'embed':181 'enabl':36 'endpoint':45,85,121,142,162 'equal':113 'estim':191 'everi':56 'exampl':210 'exchang':186 'export':171 'feed':185 'financ':182 'finance/web3':51 'found':215 'four':164 'gas':190 'generat':197 'generic':130 'geocod':194 'given':115 'group':165 'ident':201 'infer':50 'infrastructur':193 'insight':172 'json-api' 'key':75 'label':134 'land':147 'learn':175 'limit':78 'list':89,151 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':174 'maxamountrequir':99 'metric':168 'micropayment api' 'name':155 'network':9,24,65 'offer':40 'openapi':207 'page':148,224 'particular':141 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':15,30,70 'per':3,18,204 'platform':6,21,38,160 'post':123 'post-endpoint' 'premium':91,131 'price':184,200 'prompt':231 'protocol':71 'provid':145 'quot':189 'rate':77,187 'report':169 'request':57,124,205 'request/response':209 'return':126,226 'schema':208 'sentiment':176 'servic':55 'settl':66 'span':46 'specif':84 'substant':234 'summar':179 'text':178 'token':188 'unit':104 'upfront':81 'usdc':14,29,61,106,116 'usdc api' 'usdc-base' 'util':54 'valid':195 'via':12,27,67 'wallet':230 'web3':183 'x402':13,28,35,69,95 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"d0c59a44-3e57-412c-96fe-b95dfdd31b1b","listingId":"b67a2b8c-9b32-4f5f-94e4-73ce7941476c","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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.470Z"}],"sources":[{"listingId":"b67a2b8c-9b32-4f5f-94e4-73ce7941476c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/40","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.470Z","lastSeenAt":"2026-04-22T04:02:45.885Z"}],"details":{"listingId":"b67a2b8c-9b32-4f5f-94e4-73ce7941476c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/40 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/40"},{"claim":"All listed APIs 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 platform offers endpoints in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API access without API key registration","Programmatic access to analytics, AI inference, or financial data at micro-transaction prices","Testing x402 payment flows on Base network"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents with x402-compatible wallets on Base","Low-volume or exploratory API consumption at $0.02/call"],"notFor":["High-volume production workloads requiring SLAs and guaranteed uptime","Users who need detailed API documentation or OpenAPI schemas before integrating","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.331Z"},"updatedAt":"2026-04-22T04:02:45.885Z"}}