{"id":"b04cfd24-4e8d-4854-9729-c32e52f8b21a","shortId":"Xp3UgA","kind":"x402","title":"NFT metadata endpoint on Base, payable per-call via x402 with USDC.","tagline":"NFT metadata endpoint on Base, payable per-call via x402 with USDC.","description":"This endpoint at lowpaymentfee.com serves NFT metadata for token ID 17 via a POST request, gated behind the x402 payment protocol. Payment is settled in USDC on the Base network at $0.02 per request (20,000 base units of USDC 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 a suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing model and are settled on Base via USDC.\n\nThis specific endpoint (`/api/v1/nfts/17/metadata`) returns NFT metadata as JSON. The probe confirms the endpoint is live, returning a proper 402 challenge with x402 version 1. No OpenAPI schema, detailed documentation, or example responses were found in the crawl, so the exact structure of the returned metadata is unknown.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","post-endpoint"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","NFT info endpoint","x402 NFT","Base USDC API","pay-per-request NFT","on-chain metadata"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Response format and fields are undocumented — the exact metadata structure for token 17 is unknown","Only a single NFT token ID (17) is exposed at this path; generalizability to other tokens is unclear","Crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/17/metadata","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/17/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no example request/response, and no documentation beyond the landing page listing. The specific NFT metadata structure is entirely 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'/request':138 '0.02':58,137 '000':62 '1':172 '17':37 '20':61 '402':167 '6':68 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'advertis':96 'ai/ml':108 'analysi':111 'analyt':107 'api':71,104 'attach':80 'base':5,18,55,63,145 'base-network' 'behind':43 'broader':93 'call':9,22,103 'caller':78 'challeng':168 'classif':113 'confirm':159 'convers':130 'crawl':185 'data':106,116 'decim':69 'detail':176 'document':177 'embed':114 'endpoint':3,16,28,133,150,161 'estim':124 'exact':188 'exampl':179 'exchang':119 'feed':118 'finance/web3':115 'found':182 'gas':123 'gate':42 'generat':131 'geocod':128 'header':85 'id':36 'infer':109 'infrastructur':126 'json':156 'key':72 'limit':75 'live':163 'lowpaymentfee.com':30,94 'metadata':2,15,33,154,193 'model':140 'network':56 'nft':1,14,32,153 'nft-metadata' 'no-api-key' 'on-chain metadata' 'openapi':174 'pay':101 'pay-per-cal':100 'pay-per-call' 'pay-per-request NFT' 'payabl':6,19 'payment':46,48,84,90 'per':8,21,59,102 'per-cal':7,20 'platform':95 'post':40 'post-endpoint' 'price':117,139 'probe':158 'proof':91 'proper':166 'protocol':47 'quot':122 'rate':74,120 'request':41,60 'requir':77 'respons':180 'return':152,164,192 'schema':175 'sentiment':110 'serv':31 'settl':50,143 'share':134 'simpli':79 'span':105 'specif':149 'structur':189 'suit':98 'summar':112 'token':35,121 'token metadata' 'unit':64 'unknown':195 'usdc':13,26,52,66,147 'usdc-settlement' 'util':127 'valid':88,129 'version':171 'via':10,23,38,146 'x':83 'x-payment':82 'x402':11,24,45,89,170 'x402 NFT' 'x402-payment'","prices":[{"id":"1bba9cee-5c09-49a7-91fb-8f5b36694e41","listingId":"b04cfd24-4e8d-4854-9729-c32e52f8b21a","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/17/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.442Z"}],"sources":[{"listingId":"b04cfd24-4e8d-4854-9729-c32e52f8b21a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/17/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.442Z","lastSeenAt":"2026-04-22T21:32:16.145Z"}],"details":{"listingId":"b04cfd24-4e8d-4854-9729-c32e52f8b21a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/17/metadata \\\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 402 challenge with x402 version 1, accepting USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/17/metadata"},{"claim":"maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/nfts/17/metadata"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits","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":["Retrieving metadata for a specific NFT (token 17) programmatically","Integrating NFT display data into wallets or marketplaces without API key management","Agent-driven NFT data retrieval with automatic micropayment settlement"],"bestFor":["Developers needing NFT metadata without subscription overhead","AI agents that can settle x402 payments autonomously","Applications already operating on the Base network with USDC"],"notFor":["Bulk retrieval of metadata across many NFT collections (only token 17 is exposed at this path)","Users who need free or OAuth-based API access","Production use cases requiring documented response schemas and SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.448Z"},"updatedAt":"2026-04-22T21:32:16.145Z"}}