{"id":"9dbc5445-9868-4be1-a74b-add3594a0f08","shortId":"2fz8yF","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/93` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs gated via the x402 protocol on the Base network. The specific resource appears to serve NFT-related data (resource ID 93), though the exact response payload is not documented. Payment is settled in USDC (contract `0x8335…2913` on Base) at a maximum cost of $0.02 per request (20,000 base units with 6 decimals). No API keys or rate limits are required — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises endpoints across several categories: data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point. However, the `/api/v1/nfts/93` path is not listed on the homepage, so its exact functionality is unclear — it may return metadata or ownership data for a specific NFT.\n\nThe endpoint is confirmed live: it returns a well-formed x402 version 1 challenge with a 402 status code. Documentation is minimal — there is no OpenAPI spec, no example request/response, and the crawled pages beyond the homepage only show a \"Connect wallet\" prompt. The output schema indicates the endpoint accepts HTTP POST requests and is marked as discoverable.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","nft-data","pay-per-request","no-api-key","http-post"],"categories":["web3","nft"],"synonyms":["NFT API","NFT metadata","x402 NFT endpoint","lowpaymentfee","pay-per-call NFT","Base USDC API","crypto-gated API"],"warnings":["The /api/v1/nfts/93 endpoint is not listed on the provider's homepage among available APIs — its purpose and response format are undocumented.","No OpenAPI spec, example payloads, or detailed documentation are available.","Crawled pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no useful content.","The exact nature of the NFT data returned is unknown — the listing is largely inferred from the URL path and x402 challenge."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/93","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/93","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 there is no documentation, no OpenAPI spec, no example requests or responses, and the specific /api/v1/nfts/93 path is not even listed on the provider's homepage. The actual data returned is unknown, making this effectively a stub 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'/request':170 '0.02':10,24,94,169 '000':98 '0x8335':85 '1':213 '20':97 '2913':86 '402':217 '6':102 '93':70 'Base USDC API' 'NFT API' 'NFT metadata' 'accept':250 'across':132 'advertis':130 'ai':137 'analysi':141 'analyt':136 'api':48,105 'appear':61 'attach':114 'base':8,22,56,88,99 'base-network' 'beyond':235 'broader':127 'caller':112 'categori':134 'challeng':214 'classif':143 'code':219 'collect':42 'confirm':203 'connect':241 'contract':84 'convers':160 'cost':92 'crawl':233 'crypto-gated API' 'data':5,19,67,135,195 'decim':103 'discover':258 'document':78,220 'embed':144 'endpoint':6,20,30,131,163,201,249 'estim':154 'exact':73,185 'exampl':229 'exchang':149 'feed':148 'financ':145 'form':210 'function':186 'gas':153 'gate':3,17,49 'generat':161 'geocod':158 'header':119 'homepag':182,237 'howev':173 'http':251 'http-post' 'id':69 'indic':247 'infrastructur':156 'key':106 'learn':139 'limit':109 'list':165,179 'live':204 'lowpaymentfee' 'lowpaymentfee.com':37,128 'machin':138 'mark':256 'maximum':91 'may':190 'metadata':192 'minim':222 'network':57 'nft':4,18,65,199 'nft-data' 'nft-relat':64 'no-api-key' 'offer':40 'openapi':226 'output':245 'ownership':194 'page':234 'part':34 'path':176 'pay':9,23,45 'pay-per-call NFT' 'pay-per-request':44 'payload':75 'payment':79,118,124 'per':11,25,46,95 'platform':38,129 'point':172 'post':252 'price':147,171 'prompt':243 'proof':125 'protocol':53 'quot':152 'rate':108,150 'relat':66 'request':12,26,47,96,253 'request/response':230 'requir':111 'resourc':60,68 'respons':74 'return':191,206 'schema':246 'sentiment':140 'serv':63 'settl':81 'sever':133 'show':239 'simpli':113 'spec':227 'specif':59,198 'status':218 'summar':142 'though':71 'token':151 'unclear':188 'unit':100 'usdc':14,28,83 'usdc-settlement' 'util':157 'valid':122,159 'version':212 'via':50 'wallet':242 'web3':146 'well':209 'well-form':208 'x':117 'x-payment':116 'x402':2,16,52,123,211 'x402 NFT endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"bdf330ab-5862-4e8e-98f3-72ff2662b0a2","listingId":"9dbc5445-9868-4be1-a74b-add3594a0f08","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/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.915Z"}],"sources":[{"listingId":"9dbc5445-9868-4be1-a74b-add3594a0f08","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/93","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.915Z","lastSeenAt":"2026-04-22T10:03:06.089Z"}],"details":{"listingId":"9dbc5445-9868-4be1-a74b-add3594a0f08","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/93 \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 version 1 challenge with maxAmountRequired of 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/93"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/93"},{"claim":"All listed endpoints 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":"The platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching NFT data or metadata for a specific token on a per-request payment basis","Integrating NFT lookups into agent workflows without managing API keys","Programmatic access to NFT information settled via on-chain USDC micropayments"],"bestFor":["Agents or bots that need keyless, pay-as-you-go NFT data access","Developers prototyping Web3 applications who want instant API access without signup","Micropayment-based workflows on the Base L2 network"],"notFor":["High-volume NFT data ingestion where per-request fees add up quickly","Users who need detailed API documentation or guaranteed SLAs before integrating","Non-crypto workflows that cannot produce x402 payment proofs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.936Z"},"updatedAt":"2026-04-22T10:03:06.089Z"}}