{"id":"7a241e12-7206-41ef-9f2d-799ec0c0515c","shortId":"4uA7W9","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 collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are pay-per-request using the x402 protocol, settling payments in USDC on the Base network. The platform advertises a flat rate of $0.02 per request across all listed endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint at `/api/v1/inbox/89` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json. However, the exact functionality of this particular `/inbox/89` route is not documented — the site's landing page lists categories like analytics, AI, finance, and utilities but does not mention an \"inbox\" path. It is unclear what data or service this specific endpoint provides.\n\nThe broader platform lists 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. Documentation beyond the landing page is sparse; the /api, /pricing, and /README pages all resolve to a minimal \"Connect wallet\" prompt with no additional technical details.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method","no-api-key"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["The specific endpoint /api/v1/inbox/89 is not listed among the documented APIs on the landing page — its purpose is unknown.","No OpenAPI spec, request schema, or response schema is available for any endpoint.","Documentation pages (/api, /pricing, /README) are effectively empty, showing only 'Connect wallet'.","The broader platform lists many endpoint categories but provides no technical details on request/response formats."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/89","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/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but the specific functionality of /api/v1/inbox/89 is undocumented. No OpenAPI spec, no request/response schema, and no examples are available. The site's documentation pages are empty beyond a wallet-connect prompt. The purpose of this particular 'inbox' endpoint is 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'/api/v1/inbox/89':113 '/inbox/89':163 '/pricing':240 '/readme':242 '/request':19,38 '0.02':18,37,90,142,228 '000':131 '0x8335':136 '20':130 '2913':137 '6':146 'Base network API' 'USDC micropayment API' 'accept':150 'access':119 'across':93 'addit':254 'advertis':85 'ai':12,31,177 'ai/ml':56 'analysi':206 'analyt':55,176 'api':5,24,45,99,118 'application/json':155 'base':8,27,81,132,139 'beyond':232 'broader':200 'call':4,23 'categori':174 'challeng':125 'classif':209 'collect':50 'commit':107 'connect':249 'convers':221 'crypto-paid API' 'data':11,30,54,59,192 'decim':147 'detail':256 'document':167,231 'embed':210 'enabl':44 'endpoint':16,35,52,65,96,111,149,197,203 'equal':141 'estim':218 'exact':158 'exchang':213 'feed':212 'financ':13,32,178 'finance/web3':58 'flat':87 'function':159 'gas':217 'general':61 'generat':223 'geocod':219 'given':143 'host':48 'howev':156 'inbox':186 'infer':57 'json-response' 'key':100 'land':171,234 'like':175 'limit':103 'list':95,115,173,202 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'maxamountrequir':128 'mention':184 'minim':248 'minimum':106 'network':82 'no-api-key' 'offer':10,29 'page':172,235,243 'particular':162 'path':187 'pay':2,21,68 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':67 'payment':76 'per':3,22,69,91 'platform':6,25,46,84,201 'point':230 'post':151 'post-method' 'premium':117 'price':211,229 'prompt':251 'protocol':74 'provid':198 'quot':216 'rate':88,102,214 'request':70,92,152 'requir':108 'resolv':245 'return':121,154 'rout':164 'sentiment':205 'servic':63,194 'settl':75 'site':169 'span':53 'spars':237 'specif':110,196 'summar':208 'technic':255 'text':207 'token':215 'unclear':190 'unit':133 'usdc':9,28,78,135,144 'usdc-base' 'use':71 'util':15,34,62,180 'valid':123,220 'wallet':250 'x402':43,73,124 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"38d74c13-a7ce-4f13-856a-904e538e7d80","listingId":"7a241e12-7206-41ef-9f2d-799ec0c0515c","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/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.628Z"}],"sources":[{"listingId":"7a241e12-7206-41ef-9f2d-799ec0c0515c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/89","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.628Z","lastSeenAt":"2026-04-22T04:02:46.039Z"}],"details":{"listingId":"7a241e12-7206-41ef-9f2d-799ec0c0515c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/89 \\\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":"Platform lists endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, no minimums, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/89"}],"useCases":["Accessing pay-per-request API services without API key management","Making micropayment-gated API calls settled in USDC on Base","Integrating x402-compatible endpoints into agent workflows"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with x402 payment capability on Base","Projects needing low-cost per-call pricing without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up versus flat-rate plans","Anyone without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.097Z"},"updatedAt":"2026-04-22T04:02:46.039Z"}}