{"id":"c0598a64-f1b1-4a21-8c50-0716ab8ff284","shortId":"jsNhux","kind":"x402","title":"Pay-per-call messaging endpoint on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call messaging endpoint on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at `/api/v1/messages/60` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The specific endpoint probed (`/api/v1/messages/60`) is labeled \"Premium API Access\" and accepts POST requests.\n\nThe x402 challenge confirms the endpoint is live, requiring a maximum of 20,000 base units of USDC (0.02 USD) per call, paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The platform advertises no API keys, no rate limits, and instant access. There is no OpenAPI schema, no detailed documentation for request/response formats, and no examples available from the crawled pages — the `/api`, `/pricing`, and `/README` routes all returned only a \"Connect wallet\" prompt with no further content.\n\nBecause the endpoint path includes \"messages/60\" and the description is simply \"Premium API Access,\" the exact functionality behind this endpoint is unclear. It may be a messaging or content retrieval endpoint, but without documentation or response samples this cannot be confirmed. The broader site lists 16 endpoints across four categories, all priced at $0.02 per request.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","post-endpoint","no-api-key"],"categories":["api","messaging"],"synonyms":["lowpaymentfee","low payment fee API","x402 messages API","pay per call API","USDC micropayment API","Base network API","premium API access"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Exact functionality of /api/v1/messages/60 is unknown — 'Premium API Access' is the only description","All documentation pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no useful content","No example request or response bodies could be determined"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/60","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/60","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 request/response documentation, no examples, and the exact purpose of the /messages/60 endpoint is undocumented. Effectively a stub 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'/api/v1/messages/60':34,79 '/pricing':150 '/readme':152 '0.02':11,26,107,218 '000':102 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':114 '16':210 '20':101 'Base network API' 'USDC micropayment API' 'accept':86 'access':84,128,178 'across':212 'address':113 'advertis':119 'ai/ml':54 'analyt':53 'api':50,83,121,177 'avail':143 'base':8,23,73,103,116 'base-network' 'behind':182 'broader':207 'call':4,19,110 'cannot':203 'categori':214 'challeng':91 'collect':44 'confirm':92,205 'connect':158 'content':164,193 'crawl':146 'crypto':57 'data':52 'descript':173 'detail':135 'document':136,198 'endpoint':6,21,32,62,77,94,167,184,195,211 'exact':180 'exampl':142 'financ':56 'format':139 'four':213 'function':181 'includ':169 'infer':55 'instant':127 'key':122 'label':81 'limit':125 'list':209 'live':96 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'maximum':99 'may':188 'messag':5,20,191 'messages/60':170 'network':74 'no-api-key' 'offer':42 'openapi':132 'page':147 'paid':111 'part':36 'path':168 'pay':2,17,47 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':46 'payment':66 'per':3,12,18,27,48,109,219 'platform':40,118 'post':87 'post-endpoint' 'premium':82,176 'premium API access' 'price':216 'probe':78 'prompt':160 'protocol':67 'rate':124 'request':13,28,49,88,220 'request/response':138 'requir':97 'respons':200 'retriev':194 'return':155 'rout':153 'sampl':201 'schema':133 'servic':60 'settl':68 'simpli':175 'site':208 'span':51 'specif':76 'unclear':186 'unit':104 'usd':108 'usdc':15,30,70,106 'usdc-settlement' 'use':63 'util':59 'via':9,24 'wallet':159 'without':197 'x402':10,25,65,90 'x402 messages API' 'x402-payment'","prices":[{"id":"c39af2a9-3236-481a-84a7-a05f4b657774","listingId":"c0598a64-f1b1-4a21-8c50-0716ab8ff284","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/60","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.233Z"}],"sources":[{"listingId":"c0598a64-f1b1-4a21-8c50-0716ab8ff284","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/60","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.233Z","lastSeenAt":"2026-04-22T02:32:08.313Z"}],"details":{"listingId":"c0598a64-f1b1-4a21-8c50-0716ab8ff284","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/60 \\\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 20,000 base units of USDC (0.02 USD) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/60"},{"claim":"The platform advertises $0.02 per request, no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/60"},{"claim":"The site lists 16 endpoints across data/analytics, AI/ML, finance/web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per request for API access without needing an API key","Integrating x402 micropayments into agent workflows","Accessing a messaging or content endpoint with USDC on Base"],"bestFor":["Agents or developers wanting keyless, pay-per-call API access","x402-compatible wallets and clients on Base","Low-cost micropayment experimentation"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Use cases requiring known, well-documented request/response schemas","High-throughput production workloads without verified reliability"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.817Z"},"updatedAt":"2026-04-22T02:32:08.313Z"}}