{"id":"469fe743-0af5-4cad-8b54-4bba89ff3836","shortId":"kp56hH","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 payment protocol. The specific endpoint `/api/v1/messages/48` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled on the Base network in USDC (contract 0x8335…2913) at a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All are priced at $0.02 per request.\n\nThe `/api/v1/messages/48` endpoint itself lacks detailed documentation — there is no OpenAPI schema, no example request/response payloads, and the crawled docs and pricing pages returned only a \"Connect wallet\" prompt with no additional content. The endpoint is confirmed live (returns a well-formed 402 challenge), but what the \"messages\" resource actually returns is unclear from available material. Callers should expect a JSON response (mimeType is application/json) but specific fields and behavior are undocumented.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-api","post-method","no-api-key","no-rate-limit"],"categories":["api-gateway","payments"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The purpose and expected input/output of /api/v1/messages/48 is undocumented","Docs, pricing, and README pages on the site returned only 'Connect wallet' with no substantive content","Cannot verify what data or service this specific endpoint provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/48","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/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response format, no examples, and the purpose of the 'messages/48' resource is entirely opaque. The crawled docs pages returned only 'Connect wallet' with no useful 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'/request':13,28 '0.02':12,27,85,162 '000':80 '0x8335':72 '20':79 '2913':73 '402':208 '6':90 'Base network API' 'USDC API' 'accept':59 'access':7,22,57 'across':122 'actual':215 'addit':196 'advertis':120 'ai':132 'analysi':136 'analyt':126 'api':6,21,40,56,93 'application/json':230 'attach':104 'avail':220 'base':9,24,67,81 'base-network' 'behavior':235 'broader':117 'call':4,19 'caller':102,222 'categori':124 'challeng':209 'classif':139 'collect':34 'commit':99 'confirm':201 'connect':191 'content':197 'contract':71 'convers':156 'cost':77 'crawl':183 'crypto-paid API' 'data':125,129 'decim':91 'detail':170 'doc':184 'document':171 'embed':140 'endpoint':41,50,121,167,199 'equal':84 'estim':150 'exampl':178 'exchang':145 'expect':224 'export':130 'feed':144 'field':233 'financ':141 'form':207 'four':123 'gas':149 'gate':42 'generat':157 'geocod':154 'header':109 'host':32 'infrastructur':152 'insight':131 'json':226 'json-api' 'key':94 'lack':169 'learn':134 'limit':96 'list':53 'live':202 'lowpaymentfee' 'lowpaymentfee.com':31,118 'machin':133 'materi':221 'maximum':76 'messag':213 'metric':127 'micropayment API' 'mimetyp':228 'network':68 'no-api-key' 'no-rate-limit' 'openapi':175 'page':187 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call' 'pay-per-request':36 'payload':180 'payment':46,62,108,114 'per':3,18,38,86,163 'platform':119 'post':60 'post-method' 'premium':5,20,55 'premium API access' 'price':143,160,186 'prompt':193 'proof':115 'protocol':47 'quot':148 'rate':95,146 'report':128 'request':39,61,87,164 'request/response':179 'requir':101 'resourc':214 'respons':227 'return':188,203,216 'schema':176 'sentiment':135 'settl':64 'simpli':103 'specif':49,232 'summar':138 'text':137 'token':147 'unclear':218 'undocu':237 'unit':82 'upfront':98 'usdc':15,30,70,88 'usdc-settlement' 'use':89 'util':153 'valid':112,155 'via':10,25 'wallet':192 'web3':142 'well':206 'well-form':205 'x':107 'x-payment':106 'x402':11,26,45,113 'x402 API' 'x402-payment'","prices":[{"id":"21d73184-4dd1-4e87-acec-73bb9d05a729","listingId":"469fe743-0af5-4cad-8b54-4bba89ff3836","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/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.879Z"}],"sources":[{"listingId":"469fe743-0af5-4cad-8b54-4bba89ff3836","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/48","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.879Z","lastSeenAt":"2026-04-22T02:32:07.910Z"}],"details":{"listingId":"469fe743-0af5-4cad-8b54-4bba89ff3836","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/48 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base network at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/messages/48"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/48"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium content or data behind a per-request paywall without needing an API key","Agent-driven workflows that need to pay for API calls programmatically using USDC on Base","Testing x402 payment protocol integrations with a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents with Base USDC wallets needing on-demand API access","Low-volume, pay-as-you-go API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume production workloads where $0.02/request adds up significantly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.309Z"},"updatedAt":"2026-04-22T02:32:07.910Z"}}