{"id":"de8a8e9f-fcef-440e-b951-a2c8ce76d9de","shortId":"jptdvn","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 provides a broad suite 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.\n\nThe specific endpoint `/api/v1/inbox/147` is listed as \"Premium API Access\" and advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no commitments required — callers simply attach an X-PAYMENT header to each POST request.\n\nDocumentation is minimal: the landing page lists available endpoints and pricing, but 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 usage examples. The purpose of the `/api/v1/inbox/147` path specifically (as opposed to the named category endpoints) is unclear — it may be a generic or catch-all premium endpoint, but this is not documented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","validation","conversion"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","cheap api","no-auth api"],"warnings":["No OpenAPI spec or request/response schema available","The /api, /pricing, and /README pages return only a wallet-connect prompt with no documentation","The specific endpoint path /api/v1/inbox/147 ('Premium API Access') is not explained — its function relative to the named category endpoints is unclear","No examples of request bodies or response formats are provided anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/147","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/147","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 schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/inbox/147 is undocumented. Effectively a stub 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'/api/v1/inbox/147':112,220 '/pricing':187 '/readme':189 '/request':19,38 '0.02':18,37,95,136 '000':125 '0x8335':130 '20':124 '2913':131 '6':140 'access':118 'across':54 'advertis':120 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,117,152 'attach':163 'avail':180 'base':8,27,103,126,133 'base network api' 'broad':50 'call':4,23 'caller':161 'catch':239 'catch-al':238 'categori':56,228 'cheap api' 'classif':71 'classification' 'commit':159 'connect':197 'content':202 'convers':88 'conversion' 'crypto-quotes' 'data':11,30,57,61 'data-analytics' 'decim':141 'document':173,211,247 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,181,229,242 'equal':135 'estim':82 'exact':148 'exampl':215 'exchang':77 'export':62 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'gas':81 'generat':89 'generic':236 'geocod':86 'geocoding' 'given':137 'header':168 'infrastructur':84 'insight':63 'key':153 'land':177 'learn':66 'limit':156 'list':114,179 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':144 'maxamountrequir':122 'may':233 'metric':59 'micropayment api' 'minim':175 'name':227 'network':104 'no-auth api' 'offer':10,29 'openapi':206 'oppos':224 'page':178,190 'path':221 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payabl':98 'payment':142,167 'per':3,22,96 'platform':6,25,46 'post':171 'premium':116,241 'price':75,93,183 'prompt':198 'protocol':108 'provid':48 'purpos':217 'quot':80 'rate':78,155 'report':60 'request':97,172 'request/response':209 'requir':160 'resolv':192 'schema':210 'scheme':149 'sentiment':67 'sentiment-analysis' 'simpli':162 'spec':207 'specif':110,222 'suit':51 'summar':70 'text':69 'text-summarization' 'token':79 'unclear':231 'unit':127 'usag':214 'usdc':9,28,100,129,138 'usdc api' 'usdc-base' 'util':15,34,85 'valid':87 'validation' 'via':105,145 'wallet':196 'wallet-connect':195 'web3':74 'x':166 'x-payment':165 'x402':43,107,147 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"5fe6965c-8995-4058-95d9-05907e340a89","listingId":"de8a8e9f-fcef-440e-b951-a2c8ce76d9de","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/147","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.344Z"}],"sources":[{"listingId":"de8a8e9f-fcef-440e-b951-a2c8ce76d9de","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/147","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.344Z","lastSeenAt":"2026-04-22T02:31:59.197Z"}],"details":{"listingId":"de8a8e9f-fcef-440e-b951-a2c8ce76d9de","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/147 \\\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 endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/inbox/147"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time finance data (prices, exchange rates, gas estimates) on a per-call basis","Running data analytics queries and exports with micropayments","Using utility services like geocoding and validation without subscriptions"],"bestFor":["Agents or bots that need low-friction, keyless API access","Developers prototyping with pay-as-you-go pricing on Base/USDC","Use cases requiring small, infrequent API calls without rate-limit concerns"],"notFor":["High-volume production workloads needing SLAs or guaranteed uptime","Users who need detailed API documentation or OpenAPI specs before integrating","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.141Z"},"updatedAt":"2026-04-22T02:31:59.197Z"}}