{"id":"4e7ff736-1c45-4104-9c64-f12af02c1a34","shortId":"jmvqNV","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/7` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum amount 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 endpoints are uniformly priced at $0.02 per request.\n\nDocumentation is minimal — the landing page lists available endpoints and pricing but provides no request/response schemas, example payloads, or detailed descriptions of what each endpoint returns. The `/api`, `/pricing`, and `/README` pages all resolve to a \"Connect wallet\" prompt with no additional content. Without schemas or examples, it is unclear what input the `/api/v1/messages/7` endpoint expects or what it returns beyond a JSON MIME type.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","post-endpoint","json-response","no-api-key","no-rate-limit"],"categories":["general","api-gateway"],"synonyms":["premium API","pay per call API","x402 endpoint","micropayment API","USDC API access","Base network API","lowpaymentfee"],"warnings":["No request or response schema available — the purpose and expected input of /api/v1/messages/7 are unknown.","Documentation pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no content.","The endpoint name 'Premium API Access' is generic and does not describe functionality.","No OpenAPI spec, ai-plugin manifest, or agents.txt found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/7","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/7","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), but there is no documentation, no request/response schema, no examples, and the purpose of '/api/v1/messages/7' is entirely opaque. The crawled pages beyond the landing page contain no useful 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'/api/v1/messages/7':51,220 '/pricing':195 '/readme':197 '/request':13,28 '0.02':12,27,85,164 '000':80 '0x8335':72 '20':79 '2913':73 '6':90 'Base network API' 'USDC API access' 'accept':59 'access':7,22,57 'across':122 'addit':208 'advertis':120 'ai':132 'amount':77 'analysi':136 'analyt':126 'api':6,21,40,56,93 'attach':104 'avail':174 'base':9,24,67,81 'base-network' 'beyond':227 'broader':117 'call':4,19 'caller':102 'categori':124 'classif':139 'collect':34 'commit':99 'connect':203 'content':209 'contract':71 'convers':156 'data':125,129 'decim':91 'descript':187 'detail':186 'document':167 'embed':140 'endpoint':41,50,121,159,175,191,221 'equal':84 'estim':150 'exampl':183,213 'exchang':145 'expect':222 'export':130 'feed':144 'financ':141 'four':123 'gas':149 'gate':42 'generat':157 'geocod':154 'header':109 'host':32 'infrastructur':152 'input':218 'insight':131 'json':229 'json-response' 'key':94 'land':171 'learn':134 'limit':96 'list':53,173 'lowpaymentfee' 'lowpaymentfee.com':31,118 'machin':133 'maximum':76 'metric':127 'micropayment API' 'mime':230 'minim':169 'network':68 'no-api-key' 'no-rate-limit' 'page':172,198 'pay':2,17,37 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':36 'payload':184 'payment':46,62,108,114 'per':3,18,38,86,165 'platform':119 'post':60 'post-endpoint' 'premium':5,20,55 'premium API' 'price':143,162,177 'prompt':205 'proof':115 'protocol':47 'provid':179 'quot':148 'rate':95,146 'report':128 'request':39,61,87,166 'request/response':181 'requir':101 'resolv':200 'return':192,226 'schema':182,211 'sentiment':135 'settl':64 'simpli':103 'specif':49 'summar':138 'text':137 'token':147 'type':231 'unclear':216 'uniform':161 'unit':82 'upfront':98 'usdc':15,30,70,88 'usdc-settlement' 'use':69,89 'util':153 'valid':112,155 'via':10,25 'wallet':204 'web3':142 'without':210 'x':107 'x-payment':106 'x402':11,26,45,113 'x402 endpoint' 'x402-payment'","prices":[{"id":"b40eef92-747d-4bb2-8750-7a048cbe0abd","listingId":"4e7ff736-1c45-4104-9c64-f12af02c1a34","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/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.188Z"}],"sources":[{"listingId":"4e7ff736-1c45-4104-9c64-f12af02c1a34","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/7","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.188Z","lastSeenAt":"2026-04-22T02:32:08.249Z"}],"details":{"listingId":"4e7ff736-1c45-4104-9c64-f12af02c1a34","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/7 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\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 in USDC on Base network.","source_url":"https://lowpaymentfee.com/api/v1/messages/7"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, rate limits, or commitments.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.","source_url":"https://lowpaymentfee.com/api/v1/messages/7"}],"useCases":["Accessing a premium messages endpoint with per-call USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to various data, AI, finance, and utility endpoints"],"bestFor":["Agents or developers who want zero-signup, pay-per-call API access","x402-compatible clients on the Base network","Low-volume or exploratory API usage where $0.02/call is acceptable"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who need bulk pricing or subscription plans","Callers who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.829Z"},"updatedAt":"2026-04-22T02:32:08.249Z"}}