{"id":"3304ffee-f0b5-4a5c-afc9-74016fcc119d","shortId":"j4HgGm","kind":"x402","title":"x402-gated premium API access on Base, paid per-request in USDC at $0.02/call.","tagline":"x402-gated premium API access on Base, paid per-request in USDC at $0.02/call.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The site hosts a broad catalog of pay-per-call APIs 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). All endpoints are priced at $0.02 per request.\n\nThe specific endpoint `/api/v1/apikeys/26` is listed as \"Premium API Access\" and returns a valid x402 challenge on POST. Payment is settled on the Base network in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) using the \"exact\" scheme. The maximum amount required is 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/apikeys/26` endpoint specifically returns. The site's landing page lists many API categories but does not clarify what this particular \"Premium API Access\" endpoint does versus the other listed endpoints. It may be an endpoint for generating or retrieving API keys, but this is speculative.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","api-key-management"],"categories":["infrastructure","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee","crypto API gateway"],"warnings":["No documentation available — docs, pricing, and README pages render only a wallet-connect prompt","No OpenAPI or schema definition for request or response payloads","The specific function of /api/v1/apikeys/26 ('Premium API Access') is unclear relative to the other listed endpoints","No request/response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/26","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/apikeys/26","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, but documentation is essentially nonexistent — docs/pricing/README pages all show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no clear description of what this specific endpoint returns. The purpose of '/api/v1/apikeys/26' is 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'may':228 'metric':63 'micropayment API' 'network':126 'openapi':186 'page':171,205 'paid':9,26 'particular':216 'pay':56 'pay-per-cal':55 'pay-per-call API' 'pay-per-request' 'payment':46,120,152 'per':11,28,57,100 'per-request':10,27 'post':119 'premium':4,21,40,109,217 'price':79,97,168 'prompt':178 'protocol':47 'provid':39 'quot':84 'rate':82 'readm':170 'render':173 'report':64 'request':12,29,101 'request/response':189 'requir':138 'retriev':235 'return':113,200 'schema':187 'scheme':134 'second':159 'sentiment':71 'settl':122 'site':49,202 'span':60 'spars':164 'specif':103,199 'specul':241 'summar':74 'text':73 'timeout':160 'token':83 'unit':143 'usdc':14,31,128,147 'usdc-settlement' 'use':131,148 'util':89 'valid':91,115 'versus':222 'via':43 'wallet':177 'web3':78 'x402':2,19,45,116 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"42d037ff-5594-4138-b307-ff34e9c0a313","listingId":"3304ffee-f0b5-4a5c-afc9-74016fcc119d","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/apikeys/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:25.299Z"}],"sources":[{"listingId":"3304ffee-f0b5-4a5c-afc9-74016fcc119d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/26","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:25.299Z","lastSeenAt":"2026-04-22T09:01:53.816Z"}],"details":{"listingId":"3304ffee-f0b5-4a5c-afc9-74016fcc119d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/26 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/26"},{"claim":"All listed APIs are priced at $0.02 per request with no minimums or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"The site offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/apikeys/26"}],"useCases":["Programmatic access to a suite of data, AI, finance, and utility APIs via x402 micropayments","Agent-driven API consumption without traditional API key signup or subscription","On-demand API key generation or retrieval paid per-call in USDC on Base"],"bestFor":["Developers wanting no-signup, pay-per-use API access","AI agents that can settle x402 payments on Base in USDC","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.41Z"},"updatedAt":"2026-04-22T09:01:53.816Z"}}