{"id":"db1180d3-f07e-48f5-bae5-d586e6581b0f","shortId":"s9rcdR","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 path `/api/v1/messages/65` appears to be one of many endpoints offered by the provider, which advertises 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 settled on-chain using USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The provider emphasizes simplicity: no API keys, no rate limits, no commitments — just attach an X-PAYMENT header with a valid x402 payment proof and receive a JSON response.\n\nThe specific functionality behind `/api/v1/messages/65` is not documented on the landing page (it does not appear in the listed catalog of endpoints). It may be a messaging or content retrieval endpoint, but without further documentation or an OpenAPI schema, the exact input/output contract is unknown. The provider's landing page lists other endpoints (analytics, AI inference, finance data, utilities) all at the same $0.02 price point, suggesting a uniform pricing model across the platform.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","post-method"],"categories":["api","infrastructure"],"synonyms":["premium API","paid API endpoint","x402 API","USDC micropayment API","Base network API","lowpaymentfee","pay-per-call API","messages API"],"warnings":["The specific endpoint /api/v1/messages/65 is not listed in the provider's public catalog — its exact functionality is unknown.","No OpenAPI schema, request body schema, or response schema is available.","The /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no useful content.","Without documentation, callers cannot know what POST body to send or what response to expect."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/65","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/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation for this specific path, no example request/response, and the purpose of /api/v1/messages/65 is not explained anywhere in the crawled material. Effectively a stub 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'/request':13,28 '0.02':12,27,78,124,222 '000':119 '0x8335':109 '20':118 '2913':110 '6':127 'Base network API' 'USDC micropayment API' 'accept':97 'access':7,22,38 'across':230 'advertis':60 'ai':67,213 'amount':116 'analyt':66,212 'api':6,21,37,134 'appear':48,174 'attach':142 'base':9,24,86,112,120 'behind':162 'broad':62 'call':4,19 'catalog':63,178 'chain':105 'challeng':90 'commit':140 'confirm':91 'content':187 'contract':108,201 'data':65,216 'decim':128 'document':166,193 'emphas':131 'endpoint':32,54,93,180,189,211 'equal':123 'exact':199 'financ':70,215 'function':161 'header':147 'infer':214 'infrastructur':73 'input/output':200 'json':157 'json-api' 'key':135 'land':169,207 'learn':69 'limit':138 'list':177,209 'live':95 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':68 'mani':53 'maximum':115 'may':182 'messag':185 'messages API' 'model':229 'network':87 'no-api-key' 'offer':55 'on-chain':103 'one':51 'openapi':196 'page':170,208 'paid API endpoint' 'path':46 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,100,146,152 'per':3,18,79 'platform':232 'point':224 'post':98 'post-method' 'premium':5,20,36 'premium API' 'price':76,223,228 'proof':153 'protocol':43 'provid':35,58,130,205 'rate':137 'receiv':155 'request':80,99 'respons':158 'retriev':188 'schema':197 'settl':81,102 'simplic':132 'span':64 'specif':45,160 'suggest':225 'uniform':227 'unit':121 'unknown':203 'usdc':15,30,83,107,125 'usdc-base' 'use':106,126 'util':74,217 'valid':150 'via':10,25,39 'web3':71 'without':191 'x':145 'x-payment':144 'x402':11,26,41,89,151 'x402 API' 'x402-payment'","prices":[{"id":"879f2d94-026b-4375-afef-f99e1e802207","listingId":"db1180d3-f07e-48f5-bae5-d586e6581b0f","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/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.281Z"}],"sources":[{"listingId":"db1180d3-f07e-48f5-bae5-d586e6581b0f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/65","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.281Z","lastSeenAt":"2026-04-22T02:32:08.364Z"}],"details":{"listingId":"db1180d3-f07e-48f5-bae5-d586e6581b0f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/65 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 confirms live status with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/65"}],"useCases":["Accessing premium content or messages behind a per-request paywall","Programmatic pay-per-call API consumption without subscription or API key management","Agent-driven workflows that need instant, keyless API access settled on-chain"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer on-chain micropayments over traditional billing"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible wallet or USDC balance"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.71Z"},"updatedAt":"2026-04-22T02:32:08.364Z"}}