{"id":"c7a1848f-5ad2-406b-8cd1-54d4c692cf6f","shortId":"CL3fPu","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 catalog of pay-per-request 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/messages/199` is listed as \"Premium API Access\" and carries a maximum charge of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). Payment is made by including an X-PAYMENT header with each request — no API keys, accounts, or rate limits are required. The platform advertises instant access and a pure pay-as-you-go model with no minimums or commitments.\n\nDocumentation is minimal: the landing page lists available endpoints and pricing, but the /api, /pricing, and /README pages all resolve to a bare \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The exact functionality behind the `/api/v1/messages/199` path is unclear — the name \"Premium API Access\" and the `/messages/` path segment suggest a messaging or content retrieval endpoint, but this is speculative.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","serverless api","no-auth api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The exact functionality of /api/v1/messages/199 ('Premium API Access') is unclear — the path and name are ambiguous","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no content","No response schema or example responses are available to verify endpoint behavior","The breadth of advertised endpoints (AI, finance, geo, etc.) cannot be independently verified from the sparse docs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/199","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/messages/199","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/messages/199 is undocumented. Effectively a stub 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'/api/v1/messages/199':116,232 '/messages':243 '/pricing':197 '/readme':199 '/request':19,38 '0.02':18,37,99,135 '000':130 '20':129 '6':140 'access':122,168,240 'account':158 'across':58 'advertis':166 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,121,156,239 'avail':190 'bare':205 'base':8,27,107,131 'base network api' 'behind':230 'broad':50 'call':4,23 'carri':124 'catalog':51 'categori':60 'charg':127 'classif':75 'classification' 'commit':182 'connect':206 'content':250 'convers':92 'crypto-quotes' 'data':11,30,61,65 'data-analytics' 'decim':141 'detail':213 'document':183,222 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,115,191,252 'estim':86 'exact':228 'exampl':226 'exchang':81 'export':66 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'function':229 'gas':85 'generat':93 'geocod':90 'geocoding' 'go':176 'header':151 'includ':146 'infrastructur':88 'insight':67 'instant':167 'key':157 'land':187 'learn':70 'limit':161 'list':118,189 'low payment fee' 'lowpaymentfee.com':39 'machin':69 'made':144 'maximum':126 'messag':248 'metric':63 'micropayment api' 'minim':185 'minimum':180 'model':177 'name':237 'network':108 'no-api-key' 'no-auth api' 'offer':10,29 'openapi':217 'page':188,200 'path':233,244 'pay':2,21,54,173 'pay per call api' 'pay-as-you-go':172 'pay-per-cal':1,20 'pay-per-request':53 'payabl':102 'payment':142,150 'per':3,22,55,100 'platform':6,25,46,165 'premium':120,238 'price':79,97,193 'prompt':208 'protocol':112 'provid':48 'pure':171 'quot':84 'rate':82,160 'report':64 'request':56,101,154 'request/response':220 'requir':163 'resolv':202 'retriev':251 'schema':221 'segment':245 'sentiment':71 'sentiment-analysis' 'serverless api' 'sinc':137 'spec':218 'specif':114 'specul':256 'suggest':246 'summar':74 'technic':212 'text':73 'text-summarization' 'token':83 'unclear':235 'unit':132 'usag':225 'usd':136 'usdc':9,28,104,134,138 'usdc api' 'usdc-base-network' 'use':139 'util':15,34,89 'utility-services' 'valid':91 'via':109 'wallet':207 'web3':78 'x':149 'x-payment':148 'x402':43,111 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"724fba1b-43ce-4a7d-b9c0-74ade691ff1b","listingId":"c7a1848f-5ad2-406b-8cd1-54d4c692cf6f","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/messages/199","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.468Z"}],"sources":[{"listingId":"c7a1848f-5ad2-406b-8cd1-54d4c692cf6f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/199","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.468Z","lastSeenAt":"2026-04-22T02:32:07.090Z"}],"details":{"listingId":"c7a1848f-5ad2-406b-8cd1-54d4c692cf6f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/199 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/messages/199","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 minimums or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Payment via USDC on Base network, no API keys or rate limits required","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units (0.02 USDC) for /api/v1/messages/199","source_url":"https://lowpaymentfee.com/api/v1/messages/199"},{"claim":"Available endpoint categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) on a per-call basis without managing API keys","Fetching real-time crypto quotes, gas estimates, or exchange rates with micropayments","Running geocoding or data validation utilities without subscription commitments","Integrating pay-per-use analytics and data export into agent workflows"],"bestFor":["Developers or agents needing low-friction, keyless API access","Micropayment-based workflows where per-call billing is preferred over subscriptions","Prototyping or low-volume use cases that don't justify monthly plans"],"notFor":["High-volume production workloads where per-call costs add up (no bulk discounts documented)","Users who need detailed API documentation, SDKs, or guaranteed SLAs","Applications requiring non-USDC or non-Base-network payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.886Z"},"updatedAt":"2026-04-22T02:32:07.090Z"}}