{"id":"31dcfdf4-1f5a-478c-b55b-f2baba96ea79","shortId":"EDksPn","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":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource `/api/v1/messages/109` is one of many endpoints offered by the platform, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests and settling payments in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base). The max amount required is 20,000 base units, which at 6 decimals for USDC equals $0.02. The payment scheme is \"exact\" with a 300-second timeout. The response MIME type is `application/json`.\n\nNote that the specific functionality behind `/api/v1/messages/109` is not documented on the landing page — the site lists analytics, AI, finance, and utility endpoints but does not describe a \"messages\" resource. This particular endpoint's behavior and response schema are unknown beyond the generic \"Premium API Access\" label. The platform itself appears to be a demonstration or marketplace of low-cost x402-gated APIs.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment API","crypto-paid API"],"warnings":["The /api/v1/messages/109 endpoint is not listed or documented on the provider's landing page — its specific functionality is unknown.","No OpenAPI spec, request schema, or response schema is available for this endpoint.","The crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content.","The platform appears to be a demonstration or early-stage project; reliability and uptime are unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/109","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/109","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 the specific endpoint /api/v1/messages/109 has no documentation, no request/response schema, and no description beyond the generic 'Premium API Access' label. The crawled site lists many other endpoints but not this one, making its actual functionality 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'/request':13,28 '0.02':12,27,76,131 '000':121 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':112 '20':120 '300':139 '402 payment API' '6':126 'Base network API' 'USDC micropayment API' 'accept':103 'access':7,22,38,193 'ai':63,166 'amount':117 'analyt':62,165 'api':6,21,37,88,192,212 'appear':198 'application/json':147 'base':9,24,84,114,122 'base-network' 'behavior':182 'behind':153 'beyond':188 'call':4,19 'categori':59 'challeng':97 'commit':93 'confirm':98 'contract':111 'cost':208 'crypto-paid API' 'data':61 'decim':127 'demonstr':202 'describ':174 'document':157 'endpoint':32,52,72,100,170,180 'equal':130 'exact':136 'financ':66,167 'function':152 'gate':211 'generic':190 'includ':60 'infrastructur':69 'json-response' 'key':89 'label':194 'land':160 'learn':65 'limit':91 'list':164 'live':102 'low':207 'low-cost':206 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':64 'mani':51 'marketplac':204 'max':116 'messag':176 'mime':144 'network':85 'no-api-key' 'note':148 'offer':53 'one':49 'page':161 'particular':179 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':79 'payment':42,108,133 'per':3,18,77 'platform':56,196 'post':104 'post-method' 'premium':5,20,36,191 'price':74 'protocol':43 'provid':35 'rate':90 'request':78,105 'requir':94,118 'resourc':46,177 'respons':143,184 'schema':185 'scheme':134 'second':140 'settl':107 'site':163 'span':58 'specif':45,151 'timeout':141 'type':145 'unit':123 'unknown':187 'usdc':15,30,81,110,129 'usdc-settlement' 'util':70,169 'via':10,25,39 'web3':67 'x402':11,26,41,96,210 'x402 API' 'x402-gated':209 'x402-payment'","prices":[{"id":"25ec5594-42d5-4d4c-a9b0-a62e6f8eac37","listingId":"31dcfdf4-1f5a-478c-b55b-f2baba96ea79","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/109","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.798Z"}],"sources":[{"listingId":"31dcfdf4-1f5a-478c-b55b-f2baba96ea79","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/109","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.798Z","lastSeenAt":"2026-04-22T02:32:05.870Z"}],"details":{"listingId":"31dcfdf4-1f5a-478c-b55b-f2baba96ea79","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/109 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/109"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/109"},{"claim":"Platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without needing API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need instant, keyless API access with crypto micropayments"],"bestFor":["Developers wanting frictionless pay-per-use API access without subscriptions","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users who need detailed documentation or guaranteed SLAs for the messages endpoint","Applications requiring non-crypto payment methods","High-volume use cases where per-request pricing at $0.02 adds up significantly"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:02.106Z"},"updatedAt":"2026-04-22T02:32:05.870Z"}}