{"id":"b6eb3b4d-4538-43bc-85ca-9e581423f71d","shortId":"hxJjmE","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 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 minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/32` is listed as \"Premium API Access.\" 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 endpoint accepts HTTP POST and returns `application/json`. 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 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 schemas or example payloads, callers will need to experiment to discover the expected request body and response format 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":["x402 API","pay-per-call API","USDC micropayment API","Base network API","low fee API","crypto pay API","machine learning API","analytics API"],"warnings":["No OpenAPI spec or request/response schema available for any endpoint","The specific purpose and expected payload for /api/v1/messages/32 is undocumented","All non-root pages (/api, /pricing, /README) returned only 'Connect wallet' with no useful content","Cannot verify that the advertised AI, finance, and utility endpoints actually function without testing each one"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/32","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/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, and the landing page confirms pricing and lists many endpoints. However, there is no OpenAPI spec, no request/response schemas, no example payloads, and no documentation beyond the landing page. The specific purpose of /api/v1/messages/32 is unclear beyond the generic label 'Premium API Access.' This is effectively a stub 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'/api/v1/messages/32':107 '/pricing':205 '/readme':207 '/request':18,36 '0.02':17,35,67,134,178 '000':123 '0x8335':128 '20':122 '2913':129 '6':138 'Base network API' 'USDC micropayment API' 'accept':142 'access':113 'advertis':117 'ai':11,29 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':55 'also':151 'analysi':156 'analyt':12,30,54 'analytics API' 'api':5,23,43,84,112 'application/json':147 'attach':95 'avail':188 'bare':213 'base':8,26,75,124,131 'bodi':232 'broad':48 'broader':149 'call':4,22 'caller':93,222 'challeng':116 'classif':159 'collect':49 'commit':92 'connect':214 'convers':171 'conversion' 'cost':120 'cover':10,28 'crypto pay API' 'crypto-gas-estimates' 'data':53,58 'data-analytics' 'data-export' 'decim':139 'discov':228 'document':181,201 'embed':160 'enabl':42 'endpoint':51,63,105,141,153,189,238 'equal':133 'estim':168 'everi':62 'exampl':220 'exchang':163 'exchange-rates' 'expect':230 'experi':226 'expos':152 'feed':162 'financ':13,31 'finance-price-feeds' 'finance/web3':57 'format':235 'gas':167 'general':60 'generat':173 'geocod':169 'geocoding' 'given':135 'header':99 'http':143 'infer':56 'key':85 'land':185 'limit':88 'list':109,187 'low fee API' 'lowpaymentfee.com':37 'machine learning API' 'maximum':119 'minim':183 'minimum':91 'need':224 'network':76 'offer':46 'openapi':196 'page':186,208 'paid':70 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payload':221 'payment':98 'per':3,21,68 'platform':44,150 'point':180 'post':144 'premium':111 'price':65,161,179,191 'prompt':216 'protocol':80 'quot':166 'rate':87,164 'request':69,102,231 'request/response':199 'resolv':210 'respons':234 'return':146 'schema':200,218 'sentiment':155 'simpli':94 'span':52 'spec':197 'specif':104 'suit':6,24 'summar':158 'text':157 'token':165 'unit':125 'usdc':9,27,72,127,136 'usdc-base' 'util':15,33,61 'valid':170 'validation' 'via':77 'wallet':215 'without':217 'x402':41,79,97,115 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"2f6fcc3c-6d4a-4878-81c8-c4315bbc41be","listingId":"b6eb3b4d-4538-43bc-85ca-9e581423f71d","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/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.568Z"}],"sources":[{"listingId":"b6eb3b4d-4538-43bc-85ca-9e581423f71d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/32","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.568Z","lastSeenAt":"2026-04-22T02:32:07.237Z"}],"details":{"listingId":"b6eb3b4d-4538-43bc-85ca-9e581423f71d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/32 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{\"message\": \"Hello\"}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/32"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/32"}],"useCases":["Agent-driven AI inference (sentiment, summarization, classification, embeddings) without API key management","On-demand financial data retrieval (token quotes, exchange rates, gas estimates) paid per call","Geocoding and data validation utilities for automated pipelines","Data analytics and report generation with per-request billing"],"bestFor":["Agents and bots that need keyless, pay-as-you-go API access","Developers prototyping with low-cost, no-commitment endpoints","Web3-native applications already operating on Base with USDC"],"notFor":["High-volume production workloads that need SLAs, rate-limit guarantees, or dedicated support","Users who need detailed API documentation or OpenAPI specs before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.769Z"},"updatedAt":"2026-04-22T02:32:07.237Z"}}