{"id":"bc428d9d-5ff0-4dfe-b21a-ae9648b00bad","shortId":"49YnzF","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering data, AI, 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 & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. 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/170` is listed as \"Premium API Access.\" Its x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns `application/json`. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nThe broader platform advertises additional endpoints including 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. However, no OpenAPI schema, detailed documentation, or example request/response payloads were found during the crawl; the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. The exact functionality of the `/api/v1/messages/170` endpoint is unclear from available materials.","tags":[],"capabilities":["x402-payment","per-call-pricing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["llm","data","finance","geo"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","no-auth API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The exact purpose and expected input/output of /api/v1/messages/170 is unknown — 'Premium API Access' is a generic label","All documentation pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no content","The breadth of advertised capabilities (AI, finance, geo, etc.) cannot be verified from available materials"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/170","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/170","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation, no example requests or responses, and the actual functionality of the /messages/170 endpoint is undefined. The broader site lists many endpoints but provides no detail on inputs, outputs, or 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'/api/v1/messages/170':104,227 '/pricing':207 '/readme':209 '/request':18,36 '0.02':17,35,68,131,187 '000':120 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':151 '0x8335':125 '20':119 '2913':126 '300':154 '6':135 'Base network API' 'USDC API' 'accept':139 'access':110 'addit':161 'address':150 'advertis':114,160 'ai':12,30,55 'ai-inference' 'amount':117 'analysi':165 'analyt':54 'api':5,23,43,81,109 'application/json':144 'attach':92 'avail':232 'base':8,26,76,121,128 'broad':48 'broader':158 'call':4,22 'caller':90 'challeng':113 'classif':168 'classification' 'collect':49 'commit':89 'connect':215 'content':221 'convers':180 'cover':10,28 'crawl':204 'crypto-quotes' 'data':11,29,53 'data-analytics' 'decim':136 'detail':194 'document':195 'embed':169 'embeddings' 'enabl':42 'endpoint':51,64,102,138,162,228 'equal':130 'estim':177 'everi':63 'exact':223 'exampl':197 'exchang':172 'feed':171 'financ':13,31,58 'finance-data' 'found':201 'function':224 'gas':176 'generat':182 'geocod':178 'geocoding' 'given':132 'header':96 'howev':190 'includ':163 'infrastructur':61 'key':82 'learn':57 'limit':85 'list':106 'low fee API' 'lowpaymentfee.com':37 'machin':56 'materi':233 'maximum':116 'micropayment API' 'minimum':88 'network':77 'no-auth API' 'offer':46 'openapi':192 'page':210 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'payload':199 'payment':95,146 'per':3,21,69 'per-call-pricing' 'platform':44,159 'point':189 'post':140 'premium':108 'price':66,170,188 'prompt':217 'quot':175 'rate':84,173 'request':70,99,141 'request/response':198 'return':143,212 'schema':193 'second':155 'sent':148 'sentiment':164 'sentiment-analysis' 'settl':71 'simpli':91 'span':52 'specif':101 'substant':220 'suit':6,24 'summar':167 'text':166 'text-summarization' 'timeout':156 'token':174 'unclear':230 'unit':122 'usdc':9,27,73,124,133 'usdc-base' 'util':15,33,62 'utility-apis' 'valid':179 'wallet':216 'web3':59 'x402':41,94,112 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"fd1770e7-e0f4-45e7-9ec0-049e156bcb2f","listingId":"bc428d9d-5ff0-4dfe-b21a-ae9648b00bad","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/170","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.078Z"}],"sources":[{"listingId":"bc428d9d-5ff0-4dfe-b21a-ae9648b00bad","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/170","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.078Z","lastSeenAt":"2026-04-22T05:32:15.884Z"}],"details":{"listingId":"bc428d9d-5ff0-4dfe-b21a-ae9648b00bad","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/170 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/170"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/170"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto quotes, gas estimates, or exchange rates with per-call payment","Running geocoding or data validation as a utility service from an autonomous agent","Exporting data or generating analytics reports with zero upfront commitment"],"bestFor":["AI agents needing keyless, pay-as-you-go access to diverse API endpoints","Developers prototyping with low-cost, no-commitment API calls","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-call crypto settlement adds latency overhead","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.657Z"},"updatedAt":"2026-04-22T05:32:15.884Z"}}