{"id":"8e99bc2a-b9bd-4579-a077-8d298dbf1449","shortId":"RWkELc","kind":"x402","title":"x402-gated NFT data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated NFT data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at `/api/v1/nfts/26` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific resource appears to serve NFT-related data (inferred from the URL path `/nfts/26`), though the provider's landing page labels it generically as \"Premium API Access\" without detailing the response payload.\n\nPayment is handled via the x402 protocol on the Base network. The challenge advertises a maximum amount of 20,000 base units of USDC (contract `0x8335…2913`, 6 decimals), which equals $0.02 per request. No API keys or rate limits are advertised; callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader lowpaymentfee.com platform lists roughly 16 endpoints across four categories (Data & Analytics, AI & ML, Finance & Web3, Infrastructure), all priced at $0.02 per call. Documentation beyond the landing page is essentially absent — the `/api`, `/pricing`, and `/README` routes all return only a \"Connect wallet\" prompt with no further technical detail. Because no response schema or example payloads are provided, the exact structure and content of the NFT data returned by this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","nft-data","pay-per-request","no-api-key","json-response"],"categories":["web3","nft"],"synonyms":["NFT API","NFT metadata","x402 NFT endpoint","Base USDC API","pay-per-call NFT","lowpaymentfee NFT","402 payment NFT"],"warnings":["No documentation available — /api, /pricing, and /README pages all return only a 'Connect wallet' prompt with no technical content.","Response schema and payload structure are completely unknown; 'Premium API Access' is the only description provided.","The NFT-related nature of this endpoint is inferred solely from the URL path /api/v1/nfts/26; the provider does not list it on the landing page among its advertised endpoints.","No examples, error codes, or rate-limit information are documented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/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/nfts/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 (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no response schema, no example payloads, and the exact data returned is unknown. The landing page provides only a generic label. This is effectively a stub 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'/api/v1/nfts/26':32 '/nfts/26':74 '/pricing':191 '/readme':193 '0.02':10,24,124,178 '000':112 '0x8335':118 '16':163 '20':111 '2913':119 '402 payment NFT' '6':120 'Base USDC API' 'NFT API' 'NFT metadata' 'absent':188 'accept':151 'access':87 'across':165 'advertis':106,134 'ai':170 'ai/ml':53 'amount':109 'analyt':52,169 'api':49,86,128 'appear':62 'application/json':156 'attach':137 'base':8,22,102,113 'beyond':182 'broader':158 'call':48,180 'caller':135 'categori':167 'challeng':105 'collect':40 'connect':199 'content':220 'contract':117 'data':5,19,51,68,168,224 'decim':121 'detail':89,206 'document':181 'endpoint':6,20,30,150,164,228 'equal':123 'essenti':187 'exact':217 'exampl':212 'financ':172 'finance/web3':55 'four':166 'gate':3,17 'generic':83 'handl':95 'header':142 'infer':54,69 'infrastructur':57,174 'json-response' 'key':129 'label':81 'land':79,184 'limit':132 'list':161 'lowpaymentfee NFT' 'lowpaymentfee.com':37,159 'maximum':108 'ml':171 'network':103 'nft':4,18,66,223 'nft-data' 'nft-relat':65 'no-api-key' 'page':80,185 'part':34 'path':73 'pay':9,23,46 'pay-per-cal':45 'pay-per-call NFT' 'pay-per-request' 'payload':92,213 'payment':93,141,147 'per':11,25,47,125,179 'platform':38,160 'post':152 'premium':85 'price':176 'prompt':201 'proof':148 'protocol':44,99 'provid':77,215 'rate':131 'relat':67 'remain':229 'request':12,26,126,153 'resourc':61 'respons':91,209 'return':155,196,225 'rough':162 'rout':194 'schema':210 'serv':64 'simpli':136 'span':50 'specif':60 'structur':218 'technic':205 'though':75 'unit':114 'unknown':230 'url':72 'usdc':14,28,116 'usdc-base' 'util':58 'valid':145 'via':96 'wallet':200 'web3':173 'without':88 'x':140 'x-payment':139 'x402':2,16,43,98,146 'x402 NFT endpoint' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"6d7133c0-75ac-4ee6-b7da-81bfb1ad5edf","listingId":"8e99bc2a-b9bd-4579-a077-8d298dbf1449","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/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":"2026-04-21T18:32:27.824Z"}],"sources":[{"listingId":"8e99bc2a-b9bd-4579-a077-8d298dbf1449","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/26","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.824Z","lastSeenAt":"2026-04-22T19:33:08.818Z"}],"details":{"listingId":"8e99bc2a-b9bd-4579-a077-8d298dbf1449","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/26 \\\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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/26"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/26"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The /api, /pricing, and /README pages return only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/api"}],"useCases":["Fetching NFT data or metadata on demand without managing API keys","Programmatic agent access to NFT information with per-call USDC micropayments","Integrating NFT lookups into x402-compatible agent workflows"],"bestFor":["Developers or agents already using x402 payment flows on Base","Low-volume, on-demand NFT data retrieval without subscription commitments","Experimenting with pay-per-call crypto-settled APIs"],"notFor":["High-volume NFT indexing where bulk pricing or free tiers are needed","Users who need detailed documentation or guaranteed SLAs before integrating","Non-crypto workflows that cannot produce x402 payment headers"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.82Z"},"updatedAt":"2026-04-22T19:33:08.818Z"}}