{"id":"58c412ce-64f4-4d8a-a974-670cf6c05a95","shortId":"qwkJv2","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 upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/200` is listed as \"Premium API Access\" and follows the same x402 payment pattern. The 402 challenge confirms it accepts POST requests, charges up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals), and settles on Base to address `0x1A2B…85F3`. The broader platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point.\n\nDocumentation is minimal: the landing page lists available endpoints and pricing, but there is no OpenAPI spec, no request/response schema documentation, and the /api, /pricing, and /README pages all resolve to a bare \"Connect wallet\" prompt. Without schema details or example payloads, callers will need to experiment to discover the expected input and output formats for each endpoint.","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","data-export"],"categories":["llm","finance","geo","utilities"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","ai inference api","crypto price api"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","Ancillary pages (/api, /pricing, /README) return only 'Connect wallet' with no useful content","The specific purpose of /api/v1/messages/200 is unclear; 'Premium API Access' is a generic label","Example request JSON is speculative — no schema was provided by the endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/200","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/200","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schemas, no example payloads, and the ancillary pages (/api, /pricing, /README) are empty. The listing is essentially a stub with pricing info 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'/api/v1/messages/200':109 '/pricing':213 '/readme':215 '/request':18,36 '0.02':17,35,69,141,186 '000':135 '0x1a2b':153 '20':134 '402':124 '6':145 '85f3':154 'accept':128 'access':115 'addit':159 'address':152 'advertis':158 'ai':11,29 'ai inference api' 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':55 'analysi':163 'analyt':12,30,54 'api':5,23,43,86,114 'attach':97 'avail':196 'bare':221 'base':8,26,77,136,150 'base network api' 'broad':48 'broader':156 'call':4,22 'caller':95,231 'challeng':125 'charg':131 'classif':166 'collect':49 'commit':94 'confirm':126 'connect':222 'convers':178 'conversion' 'cover':10,28 'crypto price api' 'crypto-gas-estimates' 'data':53,58,180 'data-analytics' 'data-export' 'decim':146 'detail':227 'discov':237 'document':189,209 'embed':167 'enabl':42 'endpoint':51,65,107,160,197,246 'estim':175 'everi':64 'exampl':229 'exchang':170 'exchange-rates' 'expect':239 'experi':235 'feed':169 'financ':13,31 'finance-price-feeds' 'finance/web3':57 'follow':117 'format':243 'gas':174 'general':61 'general-purpos':60 'generat':181 'geocod':176 'geocoding' 'given':142 'header':101 'i.e':140 'infer':56 'input':240 'key':87 'land':193 'limit':90 'list':111,195 'low payment fee' 'lowpaymentfee.com':37 'micropayment api' 'minim':191 'need':233 'network':78 'offer':46 'openapi':204 'output':242 'page':194,216 'paid':72 'pattern':122 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payload':230 'payment':100,121 'per':3,21,70 'platform':44,157 'point':188 'post':129 'premium':113 'price':67,168,187,199 'prompt':224 'protocol':82 'purpos':62 'quot':173 'rate':89,171 'request':71,104,130 'request/response':207 'resolv':218 'schema':208,226 'sentiment':162 'settl':148 'simpli':96 'span':52 'spec':205 'specif':106 'suit':6,24 'summar':165 'text':164 'token':172 'unit':137 'upfront':93 'usdc':9,27,74,139,143 'usdc api' 'usdc-base' 'util':15,33,63 'valid':177 'validation' 'via':79 'wallet':223 'without':225 'x402':41,81,99,120 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"9e3afae2-8d22-4835-a74f-2a7afea75309","listingId":"58c412ce-64f4-4d8a-a974-670cf6c05a95","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/200","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.614Z"}],"sources":[{"listingId":"58c412ce-64f4-4d8a-a974-670cf6c05a95","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/200","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.614Z","lastSeenAt":"2026-04-22T02:32:07.348Z"}],"details":{"listingId":"58c412ce-64f4-4d8a-a974-670cf6c05a95","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/200 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{\"message\": \"Hello\"}'","exampleRequest":{"message":"Hello"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 challenge, confirming it is live on Base with USDC","source_url":"https://lowpaymentfee.com/api/v1/messages/200"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/messages/200"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Available endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Running one-off AI inference tasks (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto token quotes or gas estimates from an agent workflow","Geocoding or data validation as part of an automated pipeline with per-call billing","Generating text embeddings for search or RAG without a subscription"],"bestFor":["Agents that need low-friction, keyless API access with crypto micropayments","Developers prototyping across multiple API categories (AI, finance, utilities) at uniform pricing","x402-compatible wallets and agent frameworks on Base"],"notFor":["High-volume production workloads that need SLAs, rate-limit guarantees, or detailed documentation","Users who require fiat billing or cannot transact in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.769Z"},"updatedAt":"2026-04-22T02:32:07.348Z"}}