{"id":"a4b4f1ab-4753-4fbf-89cc-27a621e40029","shortId":"5vbAbG","kind":"x402","title":"NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.","tagline":"NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.","description":"This endpoint serves NFT metadata for token ID 63 via an x402-gated POST request on the lowpaymentfee.com platform. Payment is settled in USDC on the Base network at a cost of $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 to access the resource.\n\nThe lowpaymentfee.com platform hosts a broader suite of pay-per-call APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (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 settle on Base via USDC.\n\nThe specific endpoint at `/api/v1/nfts/63/metadata` returns JSON (mimeType: application/json). No OpenAPI schema, request body schema, or response examples are documented, so the exact fields returned are unknown. The x402 challenge is live and well-formed, confirming the endpoint is operational.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","json-response"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","NFT token info","x402 NFT endpoint","Base USDC API","pay-per-request NFT","lowpaymentfee NFT"],"warnings":["No OpenAPI or request/response schema available — exact input and output fields are unknown","Endpoint is scoped to a single NFT (token ID 63); unclear if other token IDs are supported at different paths","No documentation pages rendered meaningful content (pricing, README, and API pages only showed 'Connect wallet')","Provider platform appears to be a generic demo or showcase site; reliability and longevity are uncertain"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/63/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/63/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works. However, there is no OpenAPI spec, no request/response schema, no documentation beyond the landing page listing, and no example payloads. The endpoint is narrowly scoped to a single NFT token ID with no explanation of what metadata is 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'/request':16,32,150 '0.02':15,31,66,149 '000':70 '20':69 '6':76 '63':41 'Base USDC API' 'NFT metadata API' 'NFT token info' 'access':101 'ai/ml':120 'analysi':123 'analyt':119 'api':79,116 'application/json':167 'attach':88 'base':5,21,60,71,156 'base-network' 'bodi':172 'broader':109 'call':9,25,115 'caller':86 'challeng':188 'classif':125 'confirm':195 'convers':142 'cost':64 'data':118 'decim':77 'document':178 'embed':126 'endpoint':3,19,34,145,161,197 'estim':136 'exact':181 'exampl':176 'exchang':131 'feed':130 'field':182 'financ':127 'form':194 'gas':135 'gate':46 'generat':143 'geocod':140 'header':93 'host':107 'id':40 'infer':121 'infrastructur':138 'json':165 'json-response' 'key':80 'limit':83 'live':190 'lowpaymentfee NFT' 'lowpaymentfee.com':51,105 'metadata':2,18,37 'mimetyp':166 'model':152 'network':61 'nft':1,17,36 'nft-metadata' 'no-api-key' 'openapi':169 'oper':199 'pay':7,23,113 'pay-per-cal':6,22,112 'pay-per-call' 'pay-per-request NFT' 'payment':53,92,98 'per':8,24,67,114 'platform':52,106 'post':47 'price':129,151 'proof':99 'quot':134 'rate':82,132 'request':48,68,171 'requir':85 'resourc':103 'respons':175 'return':164,183 'schema':170,173 'sentiment':122 'serv':35 'settl':55,154 'share':146 'simpli':87 'span':117 'specif':160 'suit':110 'summar':124 'token':39,133 'token metadata' 'unit':72 'unknown':185 'usdc':13,29,57,74,158 'usdc-settlement' 'util':139 'valid':96,141 'via':10,26,42,157 'web3':128 'well':193 'well-form':192 'x':91 'x-payment':90 'x402':11,27,45,97,187 'x402 NFT endpoint' 'x402-gated':44 'x402-payment'","prices":[{"id":"35f06541-ecb1-42e2-942e-dd15f45cdfe0","listingId":"a4b4f1ab-4753-4fbf-89cc-27a621e40029","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/63/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":"2026-04-21T18:32:28.425Z"}],"sources":[{"listingId":"a4b4f1ab-4753-4fbf-89cc-27a621e40029","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/63/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.425Z","lastSeenAt":"2026-04-22T15:03:11.879Z"}],"details":{"listingId":"a4b4f1ab-4753-4fbf-89cc-27a621e40029","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/63/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 x402 challenge returns maxAmountRequired of 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/63/metadata"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/63/metadata"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","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 on-chain NFT metadata for display in wallets or marketplaces","Programmatic access to NFT attributes for indexing or analytics","Agent-driven NFT data retrieval with automatic micropayment settlement"],"bestFor":["Developers needing NFT metadata without managing API keys","AI agents that can settle x402 payments autonomously on Base","Low-volume or on-demand NFT metadata lookups at $0.02 per call"],"notFor":["Bulk NFT metadata scraping where per-call costs would accumulate quickly","Use cases requiring detailed documentation or guaranteed SLAs","Querying metadata for arbitrary token IDs (this endpoint is scoped to token 63)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.818Z"},"updatedAt":"2026-04-22T15:03:11.879Z"}}