{"id":"e88a64a2-8cf9-4e2d-ab5c-400194ee324f","shortId":"NCNACq","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 collection 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, payable 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/17` is listed as \"Premium API Access\" and was confirmed live via a 402 challenge. Its maxAmountRequired is 20,000 base units of USDC (6 decimals), which equals $0.02. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, with a 300-second timeout. The endpoint accepts HTTP POST and returns `application/json`.\n\nDocumentation beyond the landing page is sparse — the /api, /pricing, and /README routes all resolve to a wallet-connect prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The purpose of the `/api/v1/inbox/17` path specifically (as opposed to the named endpoints like `/api/v2/ai/sentiment`) is unclear; it may be a generic or catch-all premium access route.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","exchange-rates","gas-estimates","geocoding","validation","conversion"],"categories":["llm","data","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","ai api","data analytics api","crypto price api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific path /api/v1/inbox/17 is not listed among the named endpoints on the landing page — its purpose is unclear","All documentation pages (/api, /pricing, /README) resolve to empty wallet-connect prompts with no content","No example requests or responses are documented anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/17","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/17","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation for the specific /inbox/17 path, and the /api, /pricing, /README pages are all empty wallet-connect prompts. The purpose and expected input/output of this specific endpoint are 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'/api/v1/inbox/17':122,219 '/api/v2/ai/sentiment':229 '/pricing':181 '/readme':183 '/request':19,38 '0.02':18,37,95,150 '000':141 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':156 '20':140 '300':161 '402':135 '6':146 'accept':166 'access':128,242 'across':54 'addit':195 'address':155 'ai':12,31,64 'ai api' 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,110,127 'application/json':171 'avail':210 'base':8,27,103,142,158 'base network api' 'beyond':173 'broad':50 'call':4,23 'catch':239 'catch-al':238 'categori':56 'challeng':136 'classif':71 'classification' 'collect':51 'commit':118 'confirm':131 'connect':191 'content':196 'convers':88 'conversion' 'crawl':213 'crypto price api' 'data':11,30,57,61 'data analytics api' 'data-analytics' 'decim':147 'document':172,205 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,121,165,227 'equal':149 'estim':82 'exampl':209 'exchang':77 'exchange-rates' 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'gas':81 'gas-estimates' 'generat':89 'generic':236 'geocod':86 'geocoding' 'http':167 'infrastructur':84 'insight':63 'key':111 'land':175 'learn':66 'like':228 'limit':114 'list':124 'live':132 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':153 'materi':214 'maxamountrequir':138 'may':233 'metric':59 'micropayment api' 'name':226 'network':104 'offer':10,29 'openapi':200 'oppos':223 'page':176 'path':220 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payabl':98 'payment':151 'per':3,22,96 'platform':6,25,46 'post':168 'premium':126,241 'price':75,93 'prompt':192 'protocol':108 'purpos':216 'quot':80 'rate':78,113 'report':60 'request':97 'request/response':203 'resolv':186 'return':170 'rout':184,243 'schema':204 'second':162 'sentiment':67 'sentiment-analysis' 'spars':178 'spec':201 'specif':120,221 'summar':70 'text':69 'text-summarization' 'timeout':163 'token':79 'unclear':231 'unit':143 'upfront':117 'usag':208 'usdc':9,28,100,145 'usdc api' 'usdc-base' 'util':15,34,85 'valid':87 'validation' 'via':105,133 'wallet':190 'wallet-connect':189 'web3':74 'x402':43,107 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"1017fb7a-aa51-4c8b-b95c-4df9b56a7fbc","listingId":"e88a64a2-8cf9-4e2d-ab5c-400194ee324f","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/17","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.620Z"}],"sources":[{"listingId":"e88a64a2-8cf9-4e2d-ab5c-400194ee324f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/17","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.620Z","lastSeenAt":"2026-04-22T10:32:50.378Z"}],"details":{"listingId":"e88a64a2-8cf9-4e2d-ab5c-400194ee324f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/17 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/inbox/17","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"402 challenge confirms maxAmountRequired of 20000 base units USDC on Base network with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/inbox/17"},{"claim":"Payment asset is USDC at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/17"}],"useCases":["Querying real-time financial data (prices, exchange rates, gas estimates) without API key management","Running AI inference tasks (sentiment analysis, summarization, classification, embeddings) on a per-request payment basis","Accessing utility services like geocoding, validation, and data conversion with minimal friction","Integrating pay-per-use endpoints into autonomous AI agents via x402 protocol"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle payments autonomously via x402/USDC on Base","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume production workloads needing SLAs, guaranteed uptime, or dedicated support","Users who need detailed API documentation, request/response schemas, or SDKs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.729Z"},"updatedAt":"2026-04-22T10:32:50.378Z"}}