{"id":"85afc494-91f3-4404-b26f-34d52577a475","shortId":"VshdzW","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/76` 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 endpoint appears to serve NFT-related data (resource ID 76), though the exact response payload is not documented. Payment is settled in USDC (contract `0x8335…2913` on Base) at $0.02 per call (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 (metrics, reports, exports, insights), AI & ML (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 uniformly priced at $0.02 per request. However, this specific listing is for the `/api/v1/nfts/76` path, which is not listed on the site's landing page among the advertised APIs, so its exact functionality is unclear.\n\nThe endpoint is live and returns a proper x402 challenge (HTTP 402 with version 1 accepts array). The method is POST. No OpenAPI schema, detailed documentation, or example responses were found in the crawl. The platform's documentation, pricing, and README pages all require a wallet connection and did not yield useful content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","nft-data","pay-per-request","no-api-key","post-method"],"categories":["web3","nft"],"synonyms":["NFT API","NFT data endpoint","x402 NFT","pay-per-call NFT","Base USDC API","lowpaymentfee","micropayment API","crypto-gated API"],"warnings":["The /api/v1/nfts/76 endpoint is not listed among the provider's advertised APIs on the landing page — its purpose is unclear.","No documentation, OpenAPI spec, or example responses are available; docs/pricing/README pages require wallet connection and returned no content.","Response schema and payload structure are completely unknown — callers cannot predict what data they will receive."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/76","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/76","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 schema, no example responses, and the specific /api/v1/nfts/76 path is not even listed among the provider's advertised APIs. The actual functionality and response format are 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'0.02':10,24,90,168 '000':94 '0x8335':85 '1':214 '20':93 '2913':86 '402':211 '6':98 '76':70 'Base USDC API' 'NFT API' 'NFT data endpoint' 'accept':215 'across':128 'advertis':126,192 'ai':137 'among':190 'analysi':140 'analyt':132 'api':48,101,193 'appear':61 'array':216 'attach':110 'base':8,22,56,88,95 'base-network' 'broader':123 'call':92 'caller':108 'categori':130 'challeng':209 'classif':143 'collect':42 'connect':246 'content':252 'contract':84 'convers':160 'crawl':233 'crypto-gated API' 'data':5,19,67,131 'decim':99 'detail':224 'document':78,225,237 'embed':144 'endpoint':6,20,30,60,127,163,201 'estim':154 'exact':73,196 'exampl':227 'exchang':149 'export':135 'feed':148 'financ':145 'found':230 'function':197 'gas':153 'gate':3,17,49 'generat':161 'geocod':158 'header':115 'howev':171 'http':210 'id':69 'infrastructur':156 'insight':136 'key':102 'land':188 'limit':105 'list':174,183 'live':203 'lowpaymentfee' 'lowpaymentfee.com':37,124 'method':218 'metric':133 'micropayment API' 'ml':138 'network':57 'nft':4,18,65 'nft-data' 'nft-relat':64 'no-api-key' 'offer':40 'openapi':222 'page':189,241 'part':34 'path':179 'pay':9,23,45 'pay-per-call NFT' 'pay-per-request':44 'payload':75 'payment':79,114,120 'per':11,25,46,91,169 'platform':38,125,235 'post':220 'post-method' 'price':147,166,238 'proof':121 'proper':207 'protocol':53 'quot':152 'rate':104,150 'readm':240 'relat':66 'report':134 'request':12,26,47,170 'requir':107,243 'resourc':68 'respons':74,228 'return':205 'schema':223 'sentiment':139 'serv':63 'settl':81 'sever':129 'simpli':109 'site':186 'specif':59,173 'summar':142 'text':141 'though':71 'token':151 'unclear':199 'uniform':165 'unit':96 'usdc':14,28,83 'usdc-settlement' 'use':251 'util':157 'valid':118,159 'version':213 'via':50 'wallet':245 'web3':146 'x':113 'x-payment':112 'x402':2,16,52,119,208 'x402 NFT' 'x402-gated':1,15 'x402-payment' 'yield':250","prices":[{"id":"d6ec8ad3-0044-4f79-ada2-6b467657dc9f","listingId":"85afc494-91f3-4404-b26f-34d52577a475","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/76","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.847Z"}],"sources":[{"listingId":"85afc494-91f3-4404-b26f-34d52577a475","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/76","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.847Z","lastSeenAt":"2026-04-22T05:32:24.079Z"}],"details":{"listingId":"85afc494-91f3-4404-b26f-34d52577a475","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/76 \\\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 challenge with maxAmountRequired of 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/76"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/76"},{"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 advertises APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching NFT metadata or details for a specific token/collection via a single paid request","Integrating NFT data lookups into agent workflows without managing API keys","Programmatic access to NFT information settled on-chain via USDC on Base"],"bestFor":["Developers wanting key-less, pay-per-use NFT data access","AI agents that can settle x402 payments autonomously on Base","Prototyping Web3 data pipelines without subscription commitments"],"notFor":["High-volume NFT indexing where per-call costs add up quickly","Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone needing non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.398Z"},"updatedAt":"2026-04-22T05:32:24.079Z"}}