{"id":"8278a525-2cf6-4d48-a4e0-69218e924d2c","shortId":"7QG4t7","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. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a catalog of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/payments/107` is labeled \"Premium API Access\" in the x402 challenge but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, and charges a maximum of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. The platform's landing page lists sibling endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and more — all at the same $0.02 price point.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. The exact input parameters and response format for this endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["premium API","lowpaymentfee","x402 API","pay-per-call API","USDC API access","Base network API","micropayment API"],"warnings":["No documentation available — all doc/pricing/README pages render only 'Connect wallet'","No OpenAPI or request/response schema provided","The exact functionality of this specific endpoint (/api/v1/payments/107) is unclear; 'Premium API Access' is a generic label","Cannot verify what data or service is returned after successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/107","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/payments/107","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, confirming pricing and network. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the specific functionality of '/api/v1/payments/107' beyond 'Premium API Access' is 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'/request':13,28 '0.02':12,27,81,146,191 '000':141 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':160 '20':140 '6':151 'Base network API' 'USDC API access' 'accept':132 'access':7,22,38,110 'addit':214 'address':159 'ai':68 'analysi':173 'analyt':67 'api':6,21,37,64,93,109,200 'avail':228 'base':9,24,89,142,162 'base-network' 'beyond':122 'call':4,19,154 'catalog':58 'challeng':114,127 'charg':136 'classif':176 'commit':100 'confirm':128 'connect':209 'content':215 'convers':184 'crawl':231 'data':66 'decim':152 'doc':199 'document':121,194 'embed':177 'endpoint':32,49,77,104,170,242 'exact':117,234 'exampl':227 'exchang':180 'extrem':196 'feed':179 'financ':71 'format':239 'function':118 'geocod':182 'host':56 'infrastructur':74 'input':235 'key':94 'label':107,124 'land':166 'learn':70 'limit':97 'list':168 'live':131 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'made':157 'mani':48 'materi':232 'maximum':138 'micropayment API' 'network':90 'no-api-key' 'offer':50 'one':46 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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/payments/107","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:27.531Z"}],"sources":[{"listingId":"8278a525-2cf6-4d48-a4e0-69218e924d2c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/107","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:27.531Z","lastSeenAt":"2026-04-23T17:31:47.404Z"}],"details":{"listingId":"8278a525-2cf6-4d48-a4e0-69218e924d2c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/107\n# Returns 402 with x402 payment challenge.\n# Include X-PAYMENT header with valid payment proof to access the resource.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge, maxAmountRequired 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/107"},{"claim":"Platform lists APIs at $0.02/request across data, AI, finance, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/107"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to platform services on Base"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments in USDC on Base","Users who prefer crypto-native micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","Applications requiring high-throughput with predictable flat-rate pricing","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.796Z"},"updatedAt":"2026-04-23T17:31:47.404Z"}}