{"id":"178ebde7-00a4-4bb4-a54c-78c0dcbfc22d","shortId":"Rfzm7W","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 is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Each call costs $0.02 in USDC on the Base network, settled on-chain with no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/messages/117` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requiring a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call, paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on the Base network. The timeout for payment settlement is 300 seconds.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data 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 additional content. Because of this, the exact input format and response structure for `/api/v1/messages/117` (and the other endpoints) remain unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","post-endpoint","premium-api-access"],"categories":["general","infrastructure"],"synonyms":["low payment fee API","x402 API","pay-per-call API","USDC micropayment API","Base network API","on-chain API access"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The purpose and expected input/output of /api/v1/messages/117 is unknown — 'Premium API Access' is the only descriptor","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","The broad catalog of endpoints listed on the homepage could not be independently verified for functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/117","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/117","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 confirms pricing and payment details, but there is no OpenAPI schema, no documentation, no example requests or responses, and the endpoint's actual functionality ('messages/117') is entirely opaque. Most site pages return only 'Connect wallet' with no useful 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'/api/v1/messages/117':88,217 '/pricing':191 '/readme':193 '/request':13,28 '0.02':12,27,62,116,171 '000':111 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':128 '20':110 '300':139 '6':121 'Base network API' 'USDC micropayment API' 'accept':96 'access':7,22,94 'across':50 'addit':204 'address':127 'advertis':144 'ai/ml':53 'analysi':148 'analyt':52 'api':6,21,37,75,93 'base':9,24,67,112,131 'broad':42 'broader':142 'call':4,19,60,124 'catalog':43 'chain':72 'challeng':101 'classif':151 'commit':83 'confirm':102 'connect':199 'content':205 'convers':163 'cost':61 'crawl':188 'data':51,165 'decim':122 'detail':178 'document':179 'embed':152 'enabl':36 'endpoint':49,86,145,221 'estim':160 'exact':210 'exampl':181 'exchang':155 'feed':154 'finance/web3':55 'format':212 'found':185 'gas':159 'generat':166 'geocod':161 'howev':174 'infer':54 'infrastructur':57 'input':211 'key':76 'limit':79 'list':90 'live':105 'low payment fee API' 'lowpaymentfee.com':31 'maximum':108 'network':68,132 'no-api-key' 'offer':40 'on-chain':70 'on-chain API access' 'openapi':176 'page':194 'paid':125 'pay':2,17,46 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':45 'payload':183 'payment':136 'per':3,18,47,123 'platform':38,143 'point':173 'post':97 'post-endpoint' 'premium':5,20,92 'premium-api-access' 'price':153,172 'prompt':201 'quot':158 'rate':78,156 'remain':222 'request':48,98 'request/response':182 'requir':106 'respons':214 'return':196 'schema':177 'second':140 'sentiment':147 'settl':69 'settlement':137 'sinc':118 'specif':85 'structur':215 'summar':150 'text':149 'timeout':134 'token':157 'unit':113 'unknown':223 'upfront':82 'usd':117 'usdc':15,30,64,115,119 'usdc-base' 'use':120 'util':58 'valid':162 'via':10,25 'wallet':200 'x402':11,26,35,100 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"c5bce689-04b8-4d88-b43d-55617a7df6ef","listingId":"178ebde7-00a4-4bb4-a54c-78c0dcbfc22d","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/117","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.757Z"}],"sources":[{"listingId":"178ebde7-00a4-4bb4-a54c-78c0dcbfc22d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/117","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.757Z","lastSeenAt":"2026-04-22T04:02:39.407Z"}],"details":{"listingId":"178ebde7-00a4-4bb4-a54c-78c0dcbfc22d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/117 \\\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 x402 challenge requiring 20000 base units of USDC on Base (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/messages/117"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/117"},{"claim":"Payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/messages/117"}],"useCases":["Agents that need on-demand API access without managing API keys or subscriptions","Programmatic access to premium content or services with per-call USDC micropayments","Testing x402 payment flows on the Base network"],"bestFor":["Developers or agents wanting zero-commitment, pay-as-you-go API access","x402-compatible wallets and agent frameworks on Base","Low-volume or sporadic API consumers who prefer per-call billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:02.07Z"},"updatedAt":"2026-04-22T04:02:39.407Z"}}