{"id":"a4dd10af-a1c2-44b9-948a-3157362c0e74","shortId":"bwKDKn","kind":"x402","title":"x402-gated Premium API Access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated Premium API Access on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. The specific resource path is /api/v1/charges/304, which is one of many endpoints offered by the provider. The site advertises a broad catalog spanning 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).\n\nPayment is settled on-chain via USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base. The x402 challenge advertises a maxAmountRequired of 20000 base units, which at 6 decimals equals $0.02 per request — consistent with the site's stated flat pricing of $0.02/request across all endpoints. The scheme is \"exact\", meaning the caller pays the precise amount per call. No API keys are required; access is granted purely through the x402 payment header. The provider claims no rate limits and instant access.\n\nImportant caveats: the specific endpoint /api/v1/charges/304 is not individually documented on the site's landing page, and the docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no documentation describing what this particular endpoint returns or what input it expects beyond a POST with an HTTP body. The provider's catalog is broad but entirely undocumented beyond endpoint names and one-line labels.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api-gateway","pay-per-call"],"synonyms":["premium API","x402 API","USDC API access","Base network API","pay-per-request API","lowpaymentfee","micropayment API"],"warnings":["No documentation available — docs, pricing, API, and README pages all return only 'Connect wallet' with no content","The specific endpoint /api/v1/charges/304 is not listed among the provider's advertised API catalog; its purpose is unknown","No OpenAPI schema, no request/response examples, and no error handling documentation","The broad catalog claims (AI, finance, analytics, infrastructure) are entirely unverifiable from available material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/304","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/charges/304","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 captured) and pricing is clear ($0.02/request in USDC on Base), but there is zero documentation for this specific endpoint — no OpenAPI schema, no request/response examples, and no description of what it actually returns. The docs pages are empty. The endpoint path (/api/v1/charges/304) doesn't match any of the advertised catalog endpoints, making its purpose 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'learn':77 'limit':177 'line':260 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':76 'mani':55 'maxamountrequir':118 'mean':149 'metric':70 'micropayment API' 'name':256 'network':44 'no-api-key' 'offer':57 'on-chain':104 'one':53,259 'one-lin':258 'openapi':219 'page':196,204 'particular':230 'path':48 'pay':9,23,152 'pay-per-request' 'pay-per-request API' 'payment':101,170 'paywal':40 'per':11,25,129,156 'post':240 'precis':154 'premium':4,18,34 'premium API' 'price':86,138,200 'prompt':211 'provid':33,60,173,246 'pure':166 'quot':91 'rate':89,176 'readm':203 'report':71 'request':12,26,130 'request/response':222 'requir':162 'resourc':47 'return':206,232 'schema':220 'scheme':146 'sentiment':78 'settl':103 'site':62,134,193 'span':67 'specif':46,184 'state':136 'substant':214 'summar':81 'text':80 'token':90 'undocu':253 'unit':122 'usdc':14,28,108 'usdc-settlement' 'util':96 'valid':98 'via':107 'wallet':210 'web3':85 'x402':2,16,39,114,169 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"7a18a0d5-0830-4563-aaab-4c42fb0f0ec6","listingId":"a4dd10af-a1c2-44b9-948a-3157362c0e74","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/charges/304","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:53.856Z"}],"sources":[{"listingId":"a4dd10af-a1c2-44b9-948a-3157362c0e74","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/304","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:53.856Z","lastSeenAt":"2026-04-24T01:32:05.622Z"}],"details":{"listingId":"a4dd10af-a1c2-44b9-948a-3157362c0e74","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/304 \\\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 x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/304"},{"claim":"The site advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/304"},{"claim":"The provider lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without managing API keys or subscriptions","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Testing x402 payment flows against a live endpoint with low per-call cost"],"bestFor":["Developers experimenting with x402 protocol integrations","AI agents that need keyless, pay-per-use API access on Base","Low-volume or sporadic API consumers who prefer no subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads requiring well-documented schemas and error handling","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.141Z"},"updatedAt":"2026-04-24T01:32:05.622Z"}}