{"id":"a3e2b542-7509-4603-8475-893ce8ea9402","shortId":"nMtyBq","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/97` 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 settled in USDC on the Base network.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is made in USDC (contract `0x8335…2913` on Base) with a max amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). There are no API keys required, no rate limits advertised, and access is instant once payment is included in the `X-PAYMENT` header. The payment timeout is 300 seconds.\n\nThe specific functionality behind `/api/v1/messages/97` is not documented on the provider's landing page — the landing page lists analytics, AI, finance, and utility endpoints but does not mention a \"messages\" resource. This makes the exact purpose of this particular endpoint unclear. The provider's site requires a wallet connection for deeper pages (pricing, README, API docs), so no further documentation was retrievable.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key","no-rate-limit"],"categories":["api","infrastructure"],"synonyms":["premium API","pay-per-call API","x402 endpoint","USDC micropayment API","Base network API","lowpaymentfee","messages API"],"warnings":["The specific endpoint /api/v1/messages/97 is not listed on the provider's landing page — its purpose and expected request/response format are unknown.","Documentation pages (/api, /pricing, /README) all require wallet connection and returned no useful content.","No OpenAPI spec or schema is available; request and response formats must be discovered experimentally.","The 'messages' resource category does not appear in any of the provider's advertised API groups."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/97","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/97","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 the specific functionality of /api/v1/messages/97 is undocumented. No OpenAPI schema, no request/response examples, and deeper docs are gated behind wallet connection. The listing is effectively a stub with confirmed 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'/request':13,28 '0.02':12,27,76,119 '000':114 '0x8335':104 '20':113 '2913':105 '300':152 '6':122 'Base network API' 'USDC micropayment API' 'accept':95 'access':7,22,38,135 'advertis':133 'ai':65,173 'amount':111 'analyt':64,172 'api':6,21,37,127,208 'base':9,24,84,107,115 'behind':157 'broad':60 'call':4,19 'catalog':61 'challeng':88 'confirm':89 'connect':202 'contract':103 'data':63 'decim':123 'deeper':204 'doc':209 'document':161,213 'endpoint':32,52,91,177,193 'equal':118 'exact':188 'financ':68,174 'function':156 'header':147 'host':58 'includ':141 'infrastructur':71 'instant':137 'key':128 'land':166,169 'learn':67 'limit':132 'list':171 'live':93 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':66 'made':100 'make':186 'mani':51 'max':110 'mention':181 'messag':183 'messages API' 'network':85 'no-api-key' 'no-rate-limit' 'offer':53 'one':49 'page':167,170,205 'particular':192 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,98,139,146,149 'per':3,18,77 'post':96 'post-endpoint' 'premium':5,20,36 'premium API' 'price':74,206 'protocol':43 'provid':35,56,164,196 'purpos':189 'rate':131 'readm':207 'request':78,97 'requir':129,199 'resourc':46,184 'retriev':215 'second':153 'settl':79 'site':198 'span':62 'specif':45,155 'timeout':150 'unclear':194 'unit':116 'usdc':15,30,81,102,120 'usdc-base' 'use':121 'util':72,176 'via':10,25,39 'wallet':201 'web3':69 'x':145 'x-payment':144 'x402':11,26,41,87 'x402 endpoint' 'x402-payment'","prices":[{"id":"0efacac9-6847-4a45-8624-e6a8da2b3229","listingId":"a3e2b542-7509-4603-8475-893ce8ea9402","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/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.382Z"}],"sources":[{"listingId":"a3e2b542-7509-4603-8475-893ce8ea9402","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/97","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.382Z","lastSeenAt":"2026-04-22T02:32:08.488Z"}],"details":{"listingId":"a3e2b542-7509-4603-8475-893ce8ea9402","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/97 \\\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 provider lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/messages/97"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/97"}],"useCases":["Programmatic access to a premium messages endpoint with per-call USDC payment","Agent-driven API consumption without pre-registration or API keys","Integrating pay-as-you-go API calls into automated workflows on Base"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments in USDC on Base","Prototyping workflows that need instant, keyless API access"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who prefer subscription-based pricing over per-call payments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.569Z"},"updatedAt":"2026-04-22T02:32:08.488Z"}}