{"id":"e2a7a267-5af6-4da4-bb01-860fad79cdc6","shortId":"HCae9z","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/messages/96` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers attach an X-PAYMENT header with a signed USDC payment on Base.\n\nThe wider platform advertises four endpoint categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02 per request price point.\n\nImportant caveat: the `/api/v1/messages/96` endpoint's actual functionality is not documented beyond the label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and the crawled docs pages (pricing, README, API) returned only a wallet-connect prompt with no additional content. Prospective callers should be aware that the concrete behavior of this endpoint is unknown from available documentation.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-platform","general"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["No OpenAPI or schema available — endpoint behavior is entirely undocumented","The specific endpoint /api/v1/messages/96 is not listed among the catalog on the homepage; its purpose is unclear","Docs, pricing, and README pages returned no useful content (only wallet-connect prompts)","No request or response examples available anywhere in crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/96","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/96","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge), but there is no OpenAPI schema, no request/response examples, and no documentation explaining what /api/v1/messages/96 actually does. The crawled pages beyond the landing page returned only wallet-connect prompts. This is effectively a stub listing with confirmed liveness but unknown 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'/request':19,38 '0.02':18,37,80,168 '000':84 '20':83 '6':90 'access':75,189 'account':102 'actual':179 'addit':215 'advertis':124 'ai':12,31,135 'analysi':139 'analyt':129 'api':5,24,45,74,100,188,205 'attach':108 'avail':232 'awar':221 'base':8,27,63,85,120 'base network api' 'base-network' 'behavior':225 'beyond':184 'broad':50 'call':4,23,82 'caller':107,218 'catalog':51 'categori':127 'caveat':174 'classif':142 'concret':224 'connect':211 'content':216 'convers':159 'cost':77 'crawl':200 'data':11,30,128,132 'decim':91 'doc':201 'document':183,233 'embed':143 'enabl':44 'endpoint':16,35,57,67,126,162,177,228 'estim':153 'exampl':197 'exchang':148 'export':133 'feed':147 'financ':13,32,144 'four':125 'function':180 'gas':152 'generat':160 'geocod':157 'handl':94 'header':113 'import':173 'infrastructur':155 'insight':134 'key':101 'label':186 'learn':137 'list':71,164 'low payment fee' 'lowpaymentfee.com':39 'machin':136 'metric':130 'micropayment api' 'network':64 'no-api-key' 'offer':10,29 'openapi':193 'page':202 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':92,112,118 'per':3,22,55,81,169 'platform':6,25,46,123 'point':172 'post-endpoint' 'premium':73,187 'premium api access' 'price':146,171,203 'prompt':212 'prospect':217 'protocol':98 'provid':48 'quot':151 'rate':149 'readm':204 'report':131 'request':56,170 'request/response':196 'requir':106 'return':206 'schema':194 'sentiment':138 'settl':58 'sign':116 'specif':66 'subscript':104 'summar':141 'text':140 'token':150 'unit':86 'unknown':230 'usdc':9,28,60,88,117 'usdc api' 'usdc-settlement' 'util':15,34,156 'valid':158 'via':95 'wallet':210 'wallet-connect':209 'web3':145 'wider':122 'x':111 'x-payment':110 'x402':43,97 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"efe1a4cb-7099-4f85-8158-81ba2c9247dc","listingId":"e2a7a267-5af6-4da4-bb01-860fad79cdc6","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/96","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.565Z"}],"sources":[{"listingId":"e2a7a267-5af6-4da4-bb01-860fad79cdc6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/96","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.565Z","lastSeenAt":"2026-04-22T02:32:08.705Z"}],"details":{"listingId":"e2a7a267-5af6-4da4-bb01-860fad79cdc6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/96 \\\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 endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/96"},{"claim":"All listed endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/96"}],"useCases":["Programmatic access to a pay-per-call API without needing an account or API key","Agent-driven workflows that settle per-request costs in USDC on Base","Exploring x402 protocol integration with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, per-call API access on Base","Low-cost micropayment API consumption without subscriptions"],"notFor":["Users who need detailed API documentation and schemas before integrating","High-throughput use cases where per-call crypto settlement adds latency","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.195Z"},"updatedAt":"2026-04-22T02:32:08.705Z"}}