{"id":"0e52b985-5de8-4c1a-9bc0-7ca090a4813d","shortId":"Lnva6v","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general-purpose utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol. There are no API keys, no rate limits, and no signup — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/43` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment timeout is 300 seconds. The broader platform also exposes endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.\n\nDocumentation beyond the landing page is sparse: the /api, /pricing, and /README routes all return only a \"Connect wallet\" prompt with no further detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The exact functionality behind `/api/v1/messages/43` is unclear — the description is simply \"Premium API Access\" with no further elaboration on what data or service it returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","data-analytics","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion","no-api-key"],"categories":["llm","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 API","pay per call API","USDC API","Base network API","micropayment API","premium API access"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The exact functionality of /api/v1/messages/43 ('Premium API Access') is undocumented — unclear what it returns","All documentation pages (/api, /pricing, /README) return only 'Connect wallet' with no content","No request body schema or response schema is published","No SLA, rate limit, or uptime guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/43","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/43","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/43 is undocumented. The /api, /pricing, and /README pages are all empty wallet-connect 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'/api/v1/messages/43':108,229 '/pricing':193 '/readme':195 '/request':18,36 '0.02':17,35,69,139,181 '000':128 '0x8335':133 '20':127 '2913':134 '300':149 '6':143 'Base network API' 'USDC API' 'accept':116 'access':114,238 'advertis':122 'ai':11,29 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':55 'also':154 'analysi':159 'analyt':12,30,54 'api':5,23,43,86,113,237 'attach':96 'avail':221 'base':8,26,77,129,136 'behind':228 'beyond':185 'broad':48 'broader':152 'call':4,22 'caller':94 'challeng':121 'classif':162 'collect':49 'connect':201 'convers':174 'conversion' 'cost':125 'cover':10,28 'crawl':224 'crypto-gas-estimates' 'data':53,58,245 'data-analytics' 'decim':144 'descript':233 'detail':207 'document':184,216 'elabor':242 'embed':163 'enabl':42 'endpoint':51,65,106,156 'equal':138 'estim':171 'everi':64 'exact':226 'exampl':220 'exchang':166 'exchange-rates' 'expos':155 'feed':165 'financ':13,31 'finance-price-feeds' 'finance/web3':57 'function':227 'gas':170 'general':61 'general-purpos':60 'generat':176 'geocod':172 'geocoding' 'given':140 'header':100 'infer':56 'key':87 'land':187 'limit':90 'list':110 'low payment fee' 'lowpaymentfee.com':37 'maximum':124 'micropayment API' 'network':78 'no-api-key' 'offer':46 'openapi':211 'page':188 'paid':72 'pay':2,20 'pay per call API' 'pay-per-cal':1,19 'pay-per-request' 'payment':99,146 'per':3,21,70 'platform':44,153 'point':183 'post':117 'premium':112,236 'premium API access' 'price':67,164,182 'prompt':203 'protocol':82 'purpos':62 'quot':169 'rate':89,167 'request':71,103,118 'request/response':214 'return':198,249 'rout':196 'schema':215 'second':150 'sentiment':158 'servic':247 'signup':93 'simpli':95,235 'span':52 'spars':190 'spec':212 'specif':105 'suit':6,24 'summar':161 'text':160 'timeout':147 'token':168 'unclear':231 'unit':130 'usag':219 'usdc':9,27,74,132,141 'usdc-base' 'util':15,33,63 'valid':173 'validation' 'via':79 'wallet':202 'x402':41,81,98,120 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"ac4527ff-f261-4e87-88a4-d94e61bb4596","listingId":"0e52b985-5de8-4c1a-9bc0-7ca090a4813d","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/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.014Z"}],"sources":[{"listingId":"0e52b985-5de8-4c1a-9bc0-7ca090a4813d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/43","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.014Z","lastSeenAt":"2026-04-22T02:32:08.080Z"}],"details":{"listingId":"0e52b985-5de8-4c1a-9bc0-7ca090a4813d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/43 \\\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":"Endpoint returns 402 with x402 challenge advertising 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/43"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/43"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven data retrieval with per-call USDC micropayments","On-demand AI inference (sentiment, summarization, classification, embeddings) without subscriptions","Fetching real-time crypto gas estimates and token quotes","Geocoding and data validation as utility microservices","Accessing analytics metrics and reports without API key management"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible agents that can settle USDC on Base","Low-volume or bursty workloads where per-call pricing beats subscriptions"],"notFor":["High-volume production workloads needing SLAs or guaranteed uptime documentation","Users who need detailed API documentation, request/response schemas, or error handling guides","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.174Z"},"updatedAt":"2026-04-22T02:32:08.080Z"}}