{"id":"6c120e63-7816-4f3d-a1c3-dda1dba025db","shortId":"fGHEhW","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 exposes a broad catalog of endpoints across four categories: Data & Analytics (metrics, reports, 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, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint probed (/api/v1/inbox/99) is labeled \"Premium API Access\" and returned a live 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the x402 exact scheme with no API keys or rate limits required — callers simply attach an X-PAYMENT header. The payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, and the timeout is 300 seconds.\n\nDocumentation is minimal: the landing page lists available endpoints and pricing, but there is no OpenAPI spec, no request/response schema documentation, and the /api, /pricing, and /README pages all resolve to a bare \"Connect wallet\" prompt. Without schemas or example payloads it is unclear what request bodies each endpoint expects or what response formats they return. The /api/v1/inbox/99 path does not appear in the public catalog, so its specific function is unknown beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-prices","exchange-rates","crypto-gas","geocoding","validation","conversion"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The probed path /api/v1/inbox/99 does not appear in the site's public API catalog — its purpose is unclear","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no useful content","Request and response formats are entirely undocumented; example payloads cannot be provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/99","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/99","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 request/response schemas, no documentation beyond a landing page catalog, and the specific /api/v1/inbox/99 endpoint is not listed in the public catalog. The actual functionality behind this path is 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'/api/v1/inbox/99':112,234 '/pricing':201 '/readme':203 '/request':19,38 '0.02':18,37,94,133 '000':128 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':170 '20':127 '300':175 '402':122 '402 payment api' '6':138 'access':117,254 'across':54 'address':168 'ai':12,31,63 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'analysi':67 'analyt':58 'api':5,24,45,116,152,253 'appear':238 'attach':160 'avail':184 'bare':209 'base':8,27,102,129,141 'base network api' 'beyond':249 'bodi':223 'broad':50 'call':4,23 'caller':158 'catalog':51,242 'categori':56 'challeng':123 'classif':70 'connect':210 'convers':87 'conversion' 'crypto-gas' 'data':11,30,57 'data-analytics' 'decim':139 'document':177,197 'embed':71 'enabl':44 'endpoint':16,35,53,90,110,185,225 'estim':81 'exact':148 'exampl':216 'exchang':76 'exchange-rates' 'expect':226 'export':61 'expos':48 'feed':75 'financ':13,32,72 'finance-prices' 'format':230 'four':55 'function':246 'gas':80 'generat':88 'generic':251 'geocod':85 'geocoding' 'header':165 'infrastructur':83 'insight':62 'key':153 'label':114,255 'land':181 'learn':65 'limit':156 'list':183 'live':121 'low payment fee' 'lowpaymentfee.com':39 'machin':64 'made':144 'metric':59 'micropayment api' 'minim':179 'network':103 'offer':10,29 'openapi':192 'page':182,204 'path':235 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payload':217 'payment':142,164,167 'per':3,22,95 'platform':6,25,46 'premium':115,252 'price':74,92,187 'probe':111 'prompt':212 'protocol':107 'public':241 'quot':79 'rate':77,155 'report':60 'request':96,124,222 'request/response':195 'requir':157 'resolv':206 'respons':229 'return':119,232 'schema':196,214 'scheme':149 'second':176 'sentiment':66 'settl':97 'simpli':159 'sinc':135 'spec':193 'specif':109,245 'summar':69 'text':68 'timeout':173 'token':78 'unclear':220 'unit':130 'unknown':248 'usd':134 'usdc':9,28,99,132,136 'usdc api' 'usdc-base' 'use':137 'util':15,34,84 'valid':86 'validation' 'via':104,145 'wallet':211 'web3':73 'without':213 'x':163 'x-payment':162 'x402':43,106,147 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"51c9fa6d-8e18-4620-a858-b4df804009c4","listingId":"6c120e63-7816-4f3d-a1c3-dda1dba025db","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/99","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.312Z"}],"sources":[{"listingId":"6c120e63-7816-4f3d-a1c3-dda1dba025db","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/99","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.312Z","lastSeenAt":"2026-04-22T04:02:45.714Z"}],"details":{"listingId":"6c120e63-7816-4f3d-a1c3-dda1dba025db","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/99 \\\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":"All listed endpoints are priced at $0.02 per request with no minimums or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/inbox/99 requests maxAmountRequired of 20000 base units of USDC on Base (0.02 USD)","source_url":"https://lowpaymentfee.com/api/v1/inbox/99"},{"claim":"Payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/inbox/99"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data and crypto gas estimates on a per-request payment basis","Running utility operations like geocoding or data validation with no subscription commitment","Integrating pay-as-you-go data analytics into agent workflows"],"bestFor":["Agents or developers wanting zero-signup, pay-per-call API access","Low-volume or bursty workloads where subscriptions are wasteful","Crypto-native applications already operating on Base with USDC"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without USDC on Base or unfamiliar with x402 payment flows","Applications requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.537Z"},"updatedAt":"2026-04-22T04:02:45.714Z"}}