{"id":"a333aa82-7c61-4d31-8007-7f2155b895fc","shortId":"QJ82Pa","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is a collection of pay-per-call API endpoints gated by the x402 protocol, settling payments in USDC on the Base network. The specific endpoint `/api/v1/nfts/7` is listed as \"Premium API Access\" and costs up to $0.02 per request (maxAmountRequired of 20,000 base units of USDC, which has 6 decimals = $0.02). No API keys or rate limits are advertised; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform offers endpoints across four categories: 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 functionality of the `/api/v1/nfts/7` endpoint is not documented beyond the label \"Premium API Access\" and the MIME type `application/json`. There is no OpenAPI schema, no request/response examples, and the crawled documentation pages (pricing, README, API) returned only a \"Connect wallet\" prompt with no additional content. The endpoint is confirmed live via a valid 402 challenge, but the actual data it returns remains unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","json-response","nft-api"],"categories":["web3","api-gateway"],"synonyms":["x402 API","pay-per-request API","USDC micropayment API","Base network API","lowpaymentfee","NFT endpoint","crypto-gated API"],"warnings":["No documentation available for /api/v1/nfts/7 — the actual request format and response payload are unknown.","All documentation pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no useful content.","No OpenAPI or schema definition is provided for any endpoint on the platform.","The label 'Premium API Access' is generic and does not describe the endpoint's function."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/7","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/nfts/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but there is zero documentation on what the /api/v1/nfts/7 endpoint actually returns. No OpenAPI schema, no request/response examples, and all doc pages are empty beyond a wallet-connect prompt. The listing is effectively a 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'/request':16,32 '0.02':15,31,71,86,155 '000':77 '20':76 '402':213 '6':84 'Base network API' 'NFT endpoint' 'USDC micropayment API' 'access':66,173 'across':114 'actual':217 'addit':203 'advertis':94 'ai':9,25,124 'analysi':128 'analyt':8,24,118 'api':4,20,42,65,88,172,194 'application/json':178 'attach':97 'base':7,23,55,78 'base-network' 'beyond':168 'broader':110 'call':41 'caller':95 'categori':116 'challeng':214 'classif':131 'collect':36 'confirm':208 'connect':198 'content':204 'convers':148 'cost':68 'crawl':189 'crypto-gated API' 'data':117,121,218 'decim':85 'document':167,190 'embed':132 'endpoint':13,29,43,59,113,151,164,206 'estim':142 'exampl':186 'exchang':137 'export':122 'feed':136 'financ':10,26,133 'four':115 'function':160 'gas':141 'gate':3,19,44 'generat':149 'geocod':146 'header':102 'infrastructur':144 'insight':123 'json-response' 'key':89 'label':170 'learn':126 'limit':92 'list':62 'live':209 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':125 'maxamountrequir':74 'metric':119 'mime':176 'network':56 'nft-api' 'no-api-key' 'offer':112 'openapi':182 'page':191 'pay':39 'pay-per-cal':38 'pay-per-call' 'pay-per-request API' 'payment':50,101,107 'per':40,72,156 'platform':111 'premium':64,171 'price':135,153,192 'prompt':200 'proof':108 'protocol':48 'quot':140 'rate':91,138 'readm':193 'remain':221 'report':120 'request':73,157 'request/response':185 'return':195,220 'schema':183 'sentiment':127 'settl':49 'simpli':96 'specif':58,159 'suit':5,21 'summar':130 'text':129 'token':139 'type':177 'unit':79 'unknown':222 'usdc':52,81 'usdc-settlement' 'util':12,28,145 'valid':105,147,212 'via':210 'wallet':199 'web3':134 'x':100 'x-payment':99 'x402':2,18,47,106 'x402 API' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"593073a0-7f8e-4532-bcb7-b3665513f32a","listingId":"a333aa82-7c61-4d31-8007-7f2155b895fc","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/nfts/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.519Z"}],"sources":[{"listingId":"a333aa82-7c61-4d31-8007-7f2155b895fc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/7","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.519Z","lastSeenAt":"2026-04-22T05:32:23.683Z"}],"details":{"listingId":"a333aa82-7c61-4d31-8007-7f2155b895fc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/7 \\\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 endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/7"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/7"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing NFT-related data via a single micropayment without account registration","Programmatic pay-per-call access to analytics, AI, finance, or utility endpoints","Agent-driven API consumption where x402 payment headers replace API keys"],"bestFor":["Developers who want keyless, pay-as-you-go API access settled on Base","AI agents that can autonomously pay for API calls via x402","Users who need low-cost per-request pricing without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","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":"2026-02-17T23:12:50.848Z"},"updatedAt":"2026-04-22T05:32:23.683Z"}}