{"id":"9ea50375-6090-4eb3-a868-858d31fe77ca","shortId":"rV5ACC","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\" behind an x402 paywall, settling payments in USDC on the Base network. The specific resource `/api/v1/messages/68` is one of many endpoints offered by the provider, which hosts a broad catalog spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests and requiring an exact-scheme payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a maximum timeout of 300 seconds. The response MIME type is application/json.\n\nNote that the specific functionality behind `/api/v1/messages/68` is not documented beyond the generic label \"Premium API Access.\" The provider's landing page does not list a `/messages/` route among its advertised APIs, so the exact behavior of this particular endpoint is unclear. No OpenAPI schema, request/response examples, or detailed documentation were found for this route.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","no-rate-limit"],"categories":["general","api-marketplace"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","pay-per-call API","USDC API access","Base network API","micropayment API"],"warnings":["The /api/v1/messages/68 route is not listed among the provider's advertised endpoints — its specific functionality is undocumented.","No OpenAPI spec, request schema, or response examples are available.","The provider's /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no useful content.","Exact behavior and data returned by this endpoint cannot be verified without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/68","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/68","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 documentation, no OpenAPI schema, no request/response examples, and the specific /messages/68 route is not listed among the provider's advertised APIs. The actual functionality behind this endpoint is 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'/messages':195 '/request':13,28 '0.02':12,27,102,147 '000':136 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':155 '0x8335':141 '20':135 '2913':142 '300':161 '6':145 'Base network API' 'USDC API access' 'accept':124 'access':7,22,38,185 'address':154 'advertis':199 'ai':72 'among':197 'analysi':76 'analyt':71 'api':6,21,37,107,184,200 'application/json':168 'base':9,24,49,137,144 'behavior':204 'behind':39,174 'beyond':179 'broad':67 'call':4,19,149 'catalog':68 'challeng':118 'classif':78 'commit':115 'confirm':119 'convers':95 'data':70 'decim':146 'detail':217 'document':178,218 'embed':79 'endpoint':32,59,98,121,208 'estim':89 'exact':131,203 'exact-schem':130 'exampl':215 'exchang':84 'feed':83 'financ':80 'found':220 'function':173 'gas':88 'generat':96 'generic':181 'geocod':93 'host':65 'infrastructur':91 'json-response' 'key':108 'label':182 'land':189 'learn':74 'limit':111 'list':193 'live':123 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':73 'mani':58 'maximum':158 'micropayment API' 'mime':165 'minimum':114 'network':50 'no-api-key' 'no-rate-limit' 'note':169 'offer':60 'one':56 'openapi':212 'page':190 'particular':207 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':44,133,150 'paywal':42 'per':3,18,103,148 'post':125 'premium':5,20,36,183 'price':82,100 'provid':35,63,187 'quot':87 'rate':85,110 'request':104,126 'request/response':214 'requir':128 'resourc':53 'respons':164 'rout':196,223 'schema':213 'scheme':132 'second':162 'sent':152 'sentiment':75 'settl':43 'span':69 'specif':52,172 'summar':77 'timeout':159 'token':86 'type':166 'unclear':210 'unit':138 'usdc':15,30,46,140 'usdc-base' 'util':92 'valid':94 'via':10,25 'web3':81 'x402':11,26,41,117 'x402 premium API' 'x402-payment'","prices":[{"id":"48c7f2db-1eb0-4c45-a82f-93cd6ec48690","listingId":"9ea50375-6090-4eb3-a868-858d31fe77ca","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/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.205Z"}],"sources":[{"listingId":"9ea50375-6090-4eb3-a868-858d31fe77ca","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/68","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.205Z","lastSeenAt":"2026-04-22T02:32:08.277Z"}],"details":{"listingId":"9ea50375-6090-4eb3-a868-858d31fe77ca","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/68 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requires 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/messages/68"},{"claim":"The provider lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API calls","Prototyping integrations against a low-cost pay-per-use endpoint"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with Base USDC wallets needing on-demand endpoints","Testing x402 payment flows at low cost ($0.02/call)"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume production workloads where $0.02/request adds up without bulk discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.83Z"},"updatedAt":"2026-04-22T02:32:08.277Z"}}