{"id":"03dd8994-edb2-4e83-949e-47a1ce39b152","shortId":"w4evZv","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. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/171` 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`. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nThe broader platform advertises sibling 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. Documentation beyond the landing page is sparse: the /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no further detail. Without OpenAPI specs or example request/response payloads, the exact input parameters and output formats for this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","http-post","no-api-key","no-rate-limit"],"categories":["general","api-marketplace"],"synonyms":["low payment fee","cheap API","micropayment API","x402 API","Base USDC API","pay-per-call","premium API access"],"warnings":["No OpenAPI or schema documentation available — input parameters and response format are unknown.","The specific endpoint path '/api/v1/messages/171' is not explained anywhere on the site; its function is unclear.","All documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no content.","The platform lists many endpoint categories but none have published specs or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/171","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/171","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 captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response examples, and the /api, /pricing, and /README pages are all blank beyond a wallet-connect prompt. The purpose of the specific '/messages/171' path is undocumented, making this effectively a stub 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'/api/v1/messages/171':101 '/pricing':194 '/readme':196 '/request':18,36 '0.02':17,35,68,128,182 '000':117 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':146 '0x8335':122 '20':116 '2913':123 '300':149 '6':132 'Base USDC API' 'accept':136 'access':107 'account':81 'advertis':111,155 'ai':12,30,55 'analysi':160 'analyt':54 'api':5,23,43,79,106 'application/json':141 'attach':89 'base':8,26,76,118,125 'beyond':186 'broad':48 'broader':153 'call':4,22 'caller':87 'challeng':110 'cheap API' 'classif':163 'collect':49 'connect':202 'convers':175 'cost':114 'cover':10,28 'data':11,29,53 'decim':133 'detail':208 'document':185 'embed':164 'enabl':42 'endpoint':51,64,99,135,157,225 'equal':127 'estim':172 'everi':63 'exact':217 'exampl':213 'exchang':167 'feed':166 'financ':13,31,58 'format':222 'gas':171 'generat':177 'geocod':173 'given':129 'header':93 'http':137 'http-post' 'infrastructur':61 'input':218 'json-response' 'key':80 'land':188 'learn':57 'limit':84 'list':103 'low payment fee' 'lowpaymentfee.com':37 'machin':56 'maximum':113 'micropayment API' 'network':77 'no-api-key' 'no-rate-limit' 'offer':46 'openapi':210 'output':221 'page':189,197 'paramet':219 'pay':2,20 'pay-per-cal':1,19 'pay-per-call' 'pay-per-request' 'payload':215 'payment':92,142 'per':3,21,69 'platform':44,154 'point':184 'post':138 'premium':105 'premium API access' 'price':66,165,183 'prompt':204 'quot':170 'rate':83,168 'remain':226 'request':70,96 'request/response':214 'requir':86 'resolv':199 'return':140 'second':150 'sent':144 'sentiment':159 'settl':71 'sibl':156 'simpli':88 'span':52 'spars':191 'spec':211 'specif':98 'suit':6,24 'summar':162 'text':161 'timeout':151 'token':169 'unit':119 'unknown':227 'usdc':9,27,73,121,130 'usdc-base' 'util':15,33,62 'valid':174 'wallet':203 'web3':59 'without':209 'x402':41,91,109 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"da65b430-21a1-4c96-8544-4b2dbbdbd841","listingId":"03dd8994-edb2-4e83-949e-47a1ce39b152","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/171","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.261Z"}],"sources":[{"listingId":"03dd8994-edb2-4e83-949e-47a1ce39b152","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/171","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.261Z","lastSeenAt":"2026-04-22T02:32:06.569Z"}],"details":{"listingId":"03dd8994-edb2-4e83-949e-47a1ce39b152","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/171 \\\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 network","source_url":"https://lowpaymentfee.com/api/v1/messages/171"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/171"},{"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 & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without pre-registration or API keys","Micropayment-gated data retrieval where per-call billing is preferred over subscriptions","Programmatic access to a variety of utility, AI, and finance endpoints via a single payment protocol"],"bestFor":["Developers or agents wanting frictionless, key-less API access settled on Base","Low-volume or bursty workloads where $0.02/call flat pricing is economical","x402-native agent workflows that already handle on-chain USDC payments"],"notFor":["High-volume production workloads needing documented SLAs and guaranteed uptime","Use cases requiring detailed API documentation, SDKs, or typed schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.343Z"},"updatedAt":"2026-04-22T02:32:06.569Z"}}