{"id":"4a4a7ccc-8cd9-461b-9ad6-ab2d4e35e55e","shortId":"bQezuU","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/108` is one of many endpoints offered by the provider, which hosts a broad catalog spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request, paid in USDC on the Base network.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests and settling payments in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base). The maximum amount required is 20,000 base units, which at 6 decimals equals $0.02. No API keys or rate limits are advertised; access is instant once payment is included in the `X-PAYMENT` header. The payment timeout is 300 seconds.\n\nImportant caveat: the specific functionality of `/api/v1/messages/108` is not documented on the provider's landing page, which lists other endpoint categories (analytics, AI, finance, utilities) but does not mention a \"messages\" path. There is no OpenAPI spec, no detailed request/response schema, and the crawled docs pages (pricing, README, API) all returned only a \"Connect wallet\" prompt with no further content. The actual behavior of this particular endpoint is therefore unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-method","no-api-key","no-rate-limit"],"categories":["api","infrastructure"],"synonyms":["premium API","pay-per-call API","x402 endpoint","USDC API","Base network API","lowpaymentfee","micropayment API"],"warnings":["The /api/v1/messages/108 path is not listed on the provider's landing page; its specific functionality is undocumented.","No OpenAPI spec or request/response schema is available.","Crawled documentation pages (/api, /pricing, /README) returned no useful content beyond 'Connect wallet'.","The provider's catalog lists many endpoints but details on individual endpoint behavior are absent."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/108","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/108","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation for the /messages/108 path specifically, no OpenAPI spec, no request/response schema, and the crawled doc pages are empty. The actual functionality of this endpoint is 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'/request':13,28 '0.02':12,27,76,120 '000':112 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':103 '20':111 '300':146 '6':117 'Base network API' 'USDC API' 'accept':94 'access':7,22,38,129 'actual':209 'advertis':128 'ai':65,170 'amount':108 'analyt':64,169 'api':6,21,37,122,196 'base':9,24,84,105,113 'behavior':210 'broad':60 'call':4,19 'catalog':61 'categori':168 'caveat':149 'challeng':88 'confirm':89 'connect':201 'content':207 'contract':102 'crawl':191 'data':63 'decim':118 'detail':186 'doc':192 'document':157 'endpoint':32,52,91,167,214 'equal':119 'financ':68,171 'function':152 'header':141 'host':58 'import':148 'includ':135 'infrastructur':71 'instant':131 'key':123 'land':162 'learn':67 'limit':126 'list':165 'live':93 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':66 'mani':51 'maximum':107 'mention':176 'messag':178 'micropayment API' 'network':85 'no-api-key' 'no-rate-limit' 'offer':53 'one':49 'openapi':183 'page':163,193 'paid':79 'particular':213 'path':179 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,99,133,140,143 'per':3,18,77 'post':95 'post-method' 'premium':5,20,36 'premium API' 'price':74,194 'prompt':203 'protocol':43 'provid':35,56,160 'rate':125 'readm':195 'request':78,96 'request/response':187 'requir':109 'resourc':46 'return':198 'schema':188 'second':147 'settl':98 'span':62 'spec':184 'specif':45,151 'therefor':216 'timeout':144 'unclear':217 'unit':114 'usdc':15,30,81,101 'usdc-base' 'util':72,172 'via':10,25,39 'wallet':202 'web3':69 'x':139 'x-payment':138 'x402':11,26,41,87 'x402 endpoint' 'x402-payment'","prices":[{"id":"5d2b6849-ae16-4b1e-a0d8-71f9627ba17e","listingId":"4a4a7ccc-8cd9-461b-9ad6-ab2d4e35e55e","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/108","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.828Z"}],"sources":[{"listingId":"4a4a7ccc-8cd9-461b-9ad6-ab2d4e35e55e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/108","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.828Z","lastSeenAt":"2026-04-22T02:32:05.895Z"}],"details":{"listingId":"4a4a7ccc-8cd9-461b-9ad6-ab2d4e35e55e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/108 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/108"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/108"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Provider offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a pay-per-call API without needing API keys or subscriptions","Making programmatic requests settled in USDC on Base L2","Agent-driven API consumption with per-request crypto payments"],"bestFor":["Developers wanting keyless, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone needing free or fiat-only payment options","Use cases requiring well-documented request/response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:02.011Z"},"updatedAt":"2026-04-22T02:32:05.895Z"}}