{"id":"be17d1e8-c339-45cc-8909-06efdcc4d567","shortId":"kcJsAp","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, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/inbox/25` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02). Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts HTTP POST and returns application/json.\n\nDocumentation is extremely sparse — the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples available. The purpose of the `/api/v1/inbox/25` endpoint specifically is unclear; it does not map to any of the named endpoints on the landing page. Without documentation it is impossible to determine what request body it expects or what response it produces.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["llm","finance","geo","utility"],"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 path /api/v1/inbox/25 does not correspond to any named endpoint on the landing page — its function is unclear","All documentation pages (/api, /pricing, /README) return only a wallet-connect prompt with no content","No request body schema or response examples are available anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/25","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/25","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 402 challenge, confirming pricing and network. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific /api/v1/inbox/25 path is not described anywhere on the site. The purpose and expected input/output of this endpoint are 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'/api/v1/inbox/25':112,207 '/pricing':174 '/readme':176 '/request':19,38 '0.02':18,37,95,139 '000':128 '0x8335':133 '20':127 '2913':134 '402':122 '402 payment api' '6':137 'accept':162 'access':118 'across':54 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,117,150 'application/json':167 'avail':202 'base':8,27,103,129,136 'base network api' 'bodi':235 'broad':50 'call':4,23 'catalog':51 'categori':56 'challeng':123 'classif':71 'classification' 'commit':158 'connect':184 'content':189 'convers':88 'data':11,30,57,61 'data-analytics' 'decim':138 'determin':232 'document':168,198,227 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,161,208,221 'estim':82 'exact':146 'exampl':201 'exchang':77 'expect':237 'export':62 'expos':48 'extrem':170 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'gas':81 'generat':89 'geocod':86 'geocoding' 'http':163 'imposs':230 'infrastructur':84 'insight':63 'key':151 'land':224 'learn':66 'limit':154 'list':114 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':142 'map':215 'metric':59 'micropayment api' 'name':220 'network':104 'offer':10,29 'openapi':193 'page':177,225 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':140 'per':3,22,96 'platform':6,25,46 'post':164 'premium':116 'price':75,93 'produc':242 'prompt':185 'protocol':108 'purpos':204 'quot':80 'rate':78,153 'report':60 'request':97,124,234 'request/response':196 'requir':159 'resolv':179 'respons':240 'return':120,166 'schema':197 'scheme':147 'sentiment':67 'sentiment-analysis' 'settl':98 'spars':171 'spec':194 'specif':110,209 'summar':70 'text':69 'text-summarization' 'token':79 'unclear':211 'unit':130 'upfront':157 'usdc':9,28,100,132 'usdc api' 'usdc-base' 'util':15,34,85 'utility-apis' 'valid':87 'via':105,143 'wallet':183 'wallet-connect':182 'web3':74 'without':226 'x402':43,107,145 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"dc622516-8847-4eeb-8637-7fb3a7704403","listingId":"be17d1e8-c339-45cc-8909-06efdcc4d567","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/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:21.960Z"}],"sources":[{"listingId":"be17d1e8-c339-45cc-8909-06efdcc4d567","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/25","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:21.960Z","lastSeenAt":"2026-04-22T10:02:57.364Z"}],"details":{"listingId":"be17d1e8-c339-45cc-8909-06efdcc4d567","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/25 \\\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 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/25"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/inbox/25"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates with per-call billing","Geocoding or data validation as a utility service paid in USDC on Base"],"bestFor":["Developers or agents wanting zero-commitment, pay-per-use API access","Crypto-native workflows that can settle in USDC on Base","Low-volume or bursty usage patterns where subscription pricing is wasteful"],"notFor":["High-volume production workloads needing SLAs, rate-limit guarantees, or detailed documentation","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.027Z"},"updatedAt":"2026-04-22T10:02:57.364Z"}}