{"id":"03a357e9-109e-4bb1-951a-d3a446f5b707","shortId":"2FAqBm","kind":"x402","title":"Pay-per-call NFT data endpoint on Base via x402, settling in USDC at $0.02/request.","tagline":"Pay-per-call NFT data endpoint on Base via x402, settling in USDC at $0.02/request.","description":"This x402-enabled endpoint at lowpaymentfee.com provides premium API access to NFT data (specifically the `/api/v1/nfts/1` resource). It is part of a broader suite of pay-per-call APIs offered by the same provider, spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request.\n\nThe endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge advertises a `maxAmountRequired` of 20000 base units, which equals $0.02 (USDC uses 6 decimals). No API keys are required; callers authenticate purely via the x402 payment header. The provider advertises no rate limits and instant access.\n\nThe specific NFT data returned by this endpoint is not documented in detail — the provider's landing page lists many endpoints but does not include per-endpoint schema documentation or example responses. The `/api/v1/nfts/1` path suggests it returns data for a single NFT identified by ID 1, but the exact fields and structure are unknown. No OpenAPI spec or detailed docs were found during crawling.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","nft-data","pay-per-call","no-api-key","json-response"],"categories":["web3","nft","data"],"synonyms":["NFT API","NFT metadata","x402 NFT endpoint","pay-per-request NFT","Base USDC API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — response structure is unknown","The /api/v1/nfts/1 path is not listed on the provider's landing page among advertised endpoints, raising questions about whether it is a production endpoint or a demo/test resource","No crawled pages beyond the landing page returned meaningful content (wallet connect prompts only)"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/1","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/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no response schema, no example responses, and no documentation of what the NFT endpoint actually returns. The listing is essentially a stub with verified liveness and 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'/request':17,34 '0.02':16,33,85,119 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':106 '1':193 '20000':114 '6':122 'Base USDC API' 'NFT API' 'NFT metadata' 'accept':90 'access':45,145 'advertis':110,139 'ai':74 'analyt':73 'api':44,65,125 'authent':130 'base':9,26,101,115 'base-network' 'broader':58 'call':4,21,64 'caller':129 'challeng':109 'contract':105 'crawl':211 'crypto-paid API' 'data':6,23,48,72,149,185 'decim':123 'detail':158,206 'doc':207 'document':156,175 'enabl':38 'endpoint':7,24,39,89,153,166,173 'equal':118 'exact':196 'exampl':177 'field':197 'financ':77 'found':209 'header':136 'id':192 'identifi':190 'includ':170 'infrastructur':80 'instant':144 'json':95 'json-response' 'key':126 'land':162 'learn':76 'limit':142 'list':164 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':75 'mani':165 'maxamountrequir':112 'network':102 'nft':5,22,47,148,189 'nft-data' 'no-api-key' 'offer':66 'openapi':203 'page':163 'part':55 'path':181 'pay':2,19,62 'pay-per-cal':1,18,61 'pay-per-call' 'pay-per-request NFT' 'payment':96,135 'per':3,20,63,86,172 'per-endpoint':171 'post':91 'premium':43 'premium API access' 'price':83 'provid':42,70,138,160 'pure':131 'rate':141 'request':87,92 'requir':128 'resourc':52 'respons':178 'return':94,150,184 'schema':174 'settl':12,29,98 'singl':188 'span':71 'spec':204 'specif':49,147 'structur':199 'suggest':182 'suit':59 'unit':116 'unknown':201 'usdc':14,31,104,120 'usdc-settlement' 'use':103,121 'util':81 'via':10,27,132 'web3':78 'x402':11,28,37,108,134 'x402 NFT endpoint' 'x402-enabled':36 'x402-payment'","prices":[{"id":"98e00ccf-1a4a-439b-aa98-3f8ed63822f5","listingId":"03a357e9-109e-4bb1-951a-d3a446f5b707","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/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.406Z"}],"sources":[{"listingId":"03a357e9-109e-4bb1-951a-d3a446f5b707","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.406Z","lastSeenAt":"2026-04-22T02:32:08.508Z"}],"details":{"listingId":"03a357e9-109e-4bb1-951a-d3a446f5b707","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/1 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/1"},{"claim":"All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/1"}],"useCases":["Fetching NFT metadata or details without needing an API key","Agent-driven NFT data retrieval with automatic micropayment settlement","Integrating NFT information into workflows that support x402 payment protocol"],"bestFor":["Developers or agents that already support x402 payment flows","Low-volume, on-demand NFT data lookups at $0.02 per call","Scenarios where API-key-free, pay-as-you-go access is preferred"],"notFor":["High-volume NFT indexing where per-call costs would accumulate quickly","Users who need detailed, documented response schemas before integrating","Applications requiring non-USDC or non-Base-network payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.553Z"},"updatedAt":"2026-04-22T02:32:08.508Z"}}