{"id":"8b1984ea-b0c4-4b54-8f01-5d6012605217","shortId":"WHCpUz","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 pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/messages/162` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.\n\nThe wider site lists four endpoint 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 listed endpoints share the same $0.02/request price point. Payments are routed to a single Ethereum address on Base using the canonical USDC contract (0x8335…2913).\n\nDocumentation is minimal — the /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples beyond the endpoint listing on the homepage. The specific purpose of the `/api/v1/messages/162` resource is unclear; the generic \"Premium API Access\" label does not describe what data or functionality it returns. Callers should be prepared 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","geocoding","utility-apis"],"categories":["llm","data","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","crypto api access"],"warnings":["No OpenAPI or schema documentation available — the /api, /pricing, and /README pages all return only a 'Connect wallet' prompt.","The specific purpose of /api/v1/messages/162 ('Premium API Access') is not documented; it is unclear what data or functionality this endpoint provides.","No response schema or example responses are available for any endpoint on the platform.","Cannot verify actual functionality behind any listed endpoint without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/162","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/162","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a homepage listing, and the specific function of /api/v1/messages/162 is undescribed. Effectively a stub 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'/api/v1/messages/162':69,223 '/pricing':183 '/readme':185 '/request':19,38,158 '0.02':18,37,86,157 '000':80 '0x8335':176 '20':79 '2913':177 'access':74,100,231 'address':168 'advertis':91 'ai':12,31,125 'ai-inference' 'analysi':129 'analyt':119 'api':5,24,45,73,93,230 'attach':103 'base':8,27,63,81,170 'base network api' 'beyond':211 'broad':50 'call':4,23,88 'caller':101,242 'canon':173 'catalog':51 'categori':117 'charg':76 'classif':132 'classification' 'connect':191 'contact':249 'content':197 'contract':175 'convers':149 'crypto api access' 'data':11,30,118,122,237 'data-analytics' 'describ':235 'detail':253 'document':178,206 'embed':133 'embeddings' 'enabl':44 'endpoint':16,35,57,67,116,153,213 'estim':143 'ethereum':167 'exampl':210 'exchang':138 'experi':247 'export':123 'expos':48 'feed':137 'financ':13,32,134 'finance-data' 'four':115 'function':239 'gas':142 'generat':150 'generic':228 'geocod':147 'geocoding' 'header':107 'homepag':217 'i.e':85 'infrastructur':145 'insight':124 'instant':99 'key':94 'label':71,232 'learn':127 'limit':97 'list':114,152,214 'low payment fee' 'lowpaymentfee.com':39 'machin':126 'metric':120 'micropayment api' 'minim':180 'network':64 'offer':10,29 'openapi':201 'page':186 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':106,161 'per':3,22,55,87 'platform':6,25,46,90 'point':160 'premium':72,229 'prepar':245 'price':136,159 'prompt':193 'provid':251 'purpos':220 'quot':141 'rate':96,139 'report':121 'request':56,110 'request/response':204 'resolv':188 'resourc':224 'return':241 'rout':163 'schema':205 'sentiment':128 'sentiment-analysis' 'settl':58 'share':154 'simpli':102 'singl':166 'site':113 'spec':202 'specif':66,219 'summar':131 'text':130 'text-summarization' 'token':140 'unclear':226 'unit':82 'usag':209 'usdc':9,28,60,84,174 'usdc api' 'usdc-base' 'use':171 'util':15,34,146 'utility-apis' 'valid':148 'wallet':192 'web3':135 'wider':112 'x402':43,105 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f4566421-5ab5-409e-872c-bd43a7c9fc38","listingId":"8b1984ea-b0c4-4b54-8f01-5d6012605217","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/162","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.244Z"}],"sources":[{"listingId":"8b1984ea-b0c4-4b54-8f01-5d6012605217","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/162","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.244Z","lastSeenAt":"2026-04-22T05:32:16.115Z"}],"details":{"listingId":"8b1984ea-b0c4-4b54-8f01-5d6012605217","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/162 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/messages/162","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":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"The site advertises no API keys, no rate limits, instant access, and Base network settlement.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/messages/162 specifies maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/messages/162"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.","source_url":"https://lowpaymentfee.com/api/v1/messages/162"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key registration","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates on a per-request basis","Running data analytics queries (metrics, reports, insights) with instant crypto-settled micropayments","Geocoding and data conversion via lightweight utility endpoints"],"bestFor":["Developers who want keyless, pay-as-you-go API access settled in USDC on Base","AI agents that can autonomously pay for inference or data endpoints via x402","Projects needing low-friction access to multiple API categories without subscription commitments"],"notFor":["Users who need detailed API documentation, schemas, or SLA guarantees before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.314Z"},"updatedAt":"2026-04-22T05:32:16.115Z"}}