{"id":"3ebb6a67-e579-45b2-a1de-a93f31dcdbd2","shortId":"ceNCLM","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides a collection of pay-per-call APIs gated via the x402 protocol on the Base network. The specific endpoint `/api/v1/trades/16` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base. The x402 challenge indicates a maxAmountRequired of 20000 base units, which at 6 decimals for USDC equals $0.02 per request.\n\nThe broader lowpaymentfee.com platform advertises multiple API categories including 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 at the same $0.02/request price point. The platform emphasizes no API keys, no rate limits, and instant access.\n\nHowever, the specific `/api/v1/trades/16` endpoint is not explicitly listed among the advertised API categories on the landing page. Its exact functionality is unclear — the description simply says \"Premium API Access\" with no further documentation. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no substantive content. Without an OpenAPI schema, request/response examples, or detailed documentation, the actual data returned by this endpoint remains unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["finance","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium data endpoint","crypto-paid API"],"warnings":["The specific endpoint /api/v1/trades/16 is not listed among the advertised APIs on the landing page — its exact functionality is unknown.","No OpenAPI schema, request body format, or response examples are available.","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no substantive content.","The purpose and data returned by this 'Premium API Access' endpoint cannot be verified from available materials."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/16","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/trades/16","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 there is no documentation, no OpenAPI schema, no request/response examples, and the specific functionality of /api/v1/trades/16 is undocumented. The docs pages returned only 'Connect wallet' with no 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'lowpaymentfee.com':40,104 'machin':119 'maxamountrequir':87 'metric':113 'multipl':107 'network':58 'no-api-key' 'openapi':217 'page':181,203 'pay':9,27,46 'pay-per-cal':45 'pay-per-call API' 'pay-per-request' 'payment':73 'per':11,29,47,100 'platform':105,153 'point':151 'post':71 'post-endpoint' 'premium':4,22,66,191 'premium data endpoint' 'price':129,150,200 'prompt':210 'protocol':54 'provid':41 'quot':134 'rate':132,159 'remain':231 'report':114 'request':12,30,72,101 'request/response':219 'requir':18,36 'return':205,227 'say':190 'schema':218 'sentiment':121 'settl':75 'simpli':189 'specif':60,166 'substant':213 'summar':124 'text':123 'token':133 'unclear':186 'unit':91 'unknown':232 'usdc':14,32,77,97 'usdc-settlement' 'util':139 'valid':141 'via':51 'wallet':209 'web3':128 'without':215 'x402':2,20,53,83 'x402 API' 'x402-gated':1,19 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Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:38.998Z"}],"sources":[{"listingId":"3ebb6a67-e579-45b2-a1de-a93f31dcdbd2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/16","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:38.998Z","lastSeenAt":"2026-04-26T07:03:05.481Z"}],"details":{"listingId":"3ebb6a67-e579-45b2-a1de-a93f31dcdbd2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/16 \\\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":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/16"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/16"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Multiple API categories listed: Data & Analytics, AI & ML, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium trade data or analytics behind a per-request USDC paywall","Programmatic agent-driven API consumption without managing API keys","Integrating pay-as-you-go data feeds into Web3 applications"],"bestFor":["Agents or bots that need keyless, on-demand API access settled in USDC on Base","Developers wanting to test x402 protocol integrations with low per-call costs","Applications requiring pay-per-use data without subscription commitments"],"notFor":["Users needing well-documented APIs with clear request/response schemas","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.265Z"},"updatedAt":"2026-04-26T07:03:05.481Z"}}