{"id":"17773bfe-87db-44e7-b5ce-552bee08b90c","shortId":"AhGTFx","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, 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, paid in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint `/api/v1/inbox/60` is listed as \"Premium API Access\" and returns a 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 to the specified wallet address. The endpoint accepts HTTP POST requests and returns application/json responses. However, there is no public documentation describing what this particular inbox endpoint does — the name \"Premium API Access\" and the path `/api/v1/inbox/60` do not clearly map to any of the documented API categories on the landing page.\n\nBecause the site's /api, /pricing, and /README pages all resolve to a minimal \"Connect wallet\" prompt with no further documentation, and no OpenAPI spec or detailed endpoint descriptions are available, the actual functionality behind this specific endpoint remains unclear. The platform's landing page confirms the pricing model and general endpoint catalog, but individual endpoint behavior must be inferred or tested directly.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","json-response","no-api-key","no-rate-limit"],"categories":["api-platform","finance","llm","geo","data"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific endpoint /api/v1/inbox/60 ('Premium API Access') does not appear in the site's listed API catalog — its actual functionality is unknown","All documentation pages (/api, /pricing, /README) resolve to a minimal 'Connect wallet' page with no content","No request or response examples are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/60","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/60","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 documentation, no OpenAPI spec, no request/response examples, and the specific purpose of /api/v1/inbox/60 is unknown. The landing page lists many endpoints but provides no detail on inputs or 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'/api/v1/inbox/60':122,196 '/pricing':217 '/readme':219 '/request':19,38 '0.02':18,37,95,143 '000':138 '20':137 '402':132 '6':148 'Base network API' 'USDC API' 'accept':167 'access':128,192 'across':54 'actual':244 'address':164 'ai':12,31,64 'analysi':68 'analyt':58 'api':5,24,45,110,127,191,206 'application/json':173 'avail':242 'base':8,27,103,139,151 'behavior':268 'behind':246 'broad':50 'call':4,23 'catalog':51,264 'categori':56,207 'challeng':133 'classif':71 'clear':199 'commit':118 'confirm':257 'connect':226 'convers':88 'data':11,30,57,61 'decim':149 'describ':181 'descript':240 'detail':238 'direct':274 'document':180,205,232 'embed':72 'enabl':44 'endpoint':16,35,53,91,121,166,186,239,249,263,267 'estim':82 'exact':158 'exchang':77 'export':62 'expos':48 'feed':76 'financ':13,32,73 'four':55 'function':245 'gas':81 'general':262 'generat':89 'geocod':86 'howev':175 'http':168 'http-post' 'inbox':185 'individu':266 'infer':271 'infrastructur':84 'insight':63 'json-response' 'key':111 'land':210,255 'learn':66 'limit':114 'list':124 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':65 'made':154 'map':200 'metric':59 'micropayment API' 'minim':225 'model':260 'must':269 'name':189 'network':104 'no-api-key' 'no-rate-limit' 'offer':10,29 'openapi':235 'page':211,220,256 'paid':98 'particular':184 'path':195 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payment':152 'per':3,22,96 'platform':6,25,46,253 'post':169 'premium':126,190 'price':75,93,259 'prompt':228 'protocol':108 'public':179 'quot':80 'rate':78,113 'remain':250 'report':60 'request':97,134,170 'resolv':222 'respons':174 'return':130,172 'scheme':159 'sentiment':67 'sinc':145 'site':214 'spec':236 'specif':120,248 'specifi':162 'summar':70 'test':273 'text':69 'token':79 'unclear':251 'unit':140 'upfront':117 'usd':144 'usdc':9,28,100,142,146 'usdc-base' 'use':147 'util':15,34,85 'valid':87 'via':105,155 'wallet':163,227 'web3':74 'x402':43,107,157 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"02460e7f-ef31-40c2-94d4-57ffec54e87c","listingId":"17773bfe-87db-44e7-b5ce-552bee08b90c","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/60","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:21.918Z"}],"sources":[{"listingId":"17773bfe-87db-44e7-b5ce-552bee08b90c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/60","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:21.918Z","lastSeenAt":"2026-04-22T10:02:57.308Z"}],"details":{"listingId":"17773bfe-87db-44e7-b5ce-552bee08b90c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/60 \\\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 challenge requesting up to 20,000 base units of USDC (0.02 USD) on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/60"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/60"}],"useCases":["Agents that need on-demand access to AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Programmatic retrieval of financial data like token quotes, gas estimates, and exchange rates","Utility tasks such as geocoding, data validation, and format conversion via simple HTTP calls","Data export and analytics for dashboards or reporting pipelines"],"bestFor":["AI agents and bots that can pay per-call with USDC on Base","Developers wanting zero-signup, zero-commitment API access","Low-volume or bursty workloads where flat subscriptions are wasteful"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who cannot transact in USDC on the Base network","Anyone needing detailed SLAs, uptime guarantees, or enterprise support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.247Z"},"updatedAt":"2026-04-22T10:02:57.308Z"}}