{"id":"63fb52eb-7faa-4508-addf-601e7b579042","shortId":"gaAeXV","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 marketplace that exposes a broad set 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, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/inbox/115` is listed as \"Premium API Access\" and returns a valid x402 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 `exact` scheme to the specified wallet address. No API keys or rate limits are advertised; access is instant once payment is included in the X-PAYMENT header.\n\nDocumentation is minimal — the landing page lists available endpoints and pricing, but there is no OpenAPI spec, no request/response schema documentation, and no usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a \"Connect wallet\" prompt with no additional content. Because of this, the exact functionality behind `/api/v1/inbox/115` (as opposed to the other named endpoints) is unclear. Consumers should expect to experiment or contact the provider for details.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["llm","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","cheap api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose of /api/v1/inbox/115 is unclear — 'Premium API Access' is not described anywhere","All documentation pages (/api, /pricing, /README) resolve to a 'Connect wallet' prompt with no content","No response examples or error documentation available","Cannot verify what data or functionality is actually returned by this endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/115","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/115","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/inbox/115 ('Premium API Access') is undefined. The /api, /pricing, and /README pages are empty. This is effectively a stub 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'/api/v1/inbox/115':112,226 '/pricing':204 '/readme':206 '/request':19,38 '0.02':18,37,95,135 '000':130 '20':129 '402':124 '6':140 'access':118,164 'across':54 'addit':217 'address':155 'advertis':163 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,117,157 'avail':184 'base':8,27,103,131,143 'base network api' 'behind':225 'broad':50 'call':4,23 'categori':56 'challeng':125 'cheap api' 'classif':71 'classification' 'connect':212 'consum':236 'contact':242 'content':218 'convers':88 'conversion' 'crypto-quotes' 'data':11,30,57,61 'data-analytics' 'decim':141 'detail':246 'document':177,197 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,185,233 'estim':82 'exact':149,223 'exampl':201 'exchang':77 'expect':238 'experi':240 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':224 'gas':81 'gas-estimates' 'generat':89 'geocod':86 'geocoding' 'header':176 'includ':170 'infrastructur':84 'insight':63 'instant':166 'key':158 'land':181 'learn':66 'limit':161 'list':114,183 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':65 'made':146 'marketplac':46 'metric':59 'micropayment api' 'minim':179 'name':232 'network':104 'offer':10,29 'openapi':192 'oppos':228 'page':182,207 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':144,168,175 'per':3,22,96 'platform':6,25 'premium':116 'price':75,93,187 'prompt':214 'protocol':108 'provid':244 'quot':80 'rate':78,160 'report':60 'request':97,126 'request/response':195 'resolv':209 'return':120 'schema':196 'scheme':150 'sentiment':67 'sentiment-analysis' 'set':51 'settl':98 'sinc':137 'spec':193 'specif':110 'specifi':153 'summar':70 'text':69 'text-summarization' 'token':79 'unclear':235 'unit':132 'usag':200 'usd':136 'usdc':9,28,100,134,138 'usdc api' 'usdc-base' 'use':139 'util':15,34,85 'valid':87,122 'validation' 'via':105,147 'wallet':154,213 'web3':74 'x':174 'x-payment':173 'x402':43,107,123 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"7b5a8fc0-30bd-4c01-85af-dbaa7ae67bd1","listingId":"63fb52eb-7faa-4508-addf-601e7b579042","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/115","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.208Z"}],"sources":[{"listingId":"63fb52eb-7faa-4508-addf-601e7b579042","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/115","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.208Z","lastSeenAt":"2026-04-22T12:05:15.112Z"}],"details":{"listingId":"63fb52eb-7faa-4508-addf-601e7b579042","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/115 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/inbox/115","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/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/115"},{"claim":"Available categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) on a per-call basis without API keys","Fetching real-time crypto token quotes and gas estimates via micropayment","Running geocoding or data validation requests with no subscription commitment","Exporting analytics data or generating insights reports on demand"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments in USDC on Base","Prototyping and low-volume use cases where $0.02/call is cost-effective"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without a Base-compatible USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.397Z"},"updatedAt":"2026-04-22T12:05:15.112Z"}}