{"id":"1df9dd96-809c-42a5-af34-138fa9570c5e","shortId":"CTceBm","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 37 from the lowpaymentfee.com platform. It is part of a broader suite of pay-per-request APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/nfts/37/metadata` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the `exact` scheme with a 300-second timeout. No API keys or rate limits are advertised; access is gated entirely by the x402 micropayment.\n\nDocumentation is minimal — the provider's landing page lists available endpoints and pricing but does not provide request/response schemas, example payloads, or detailed descriptions of what the NFT metadata contains. The endpoint is live and returning a valid 402 challenge, but without further documentation it is unclear what fields the metadata response includes or whether additional input parameters are supported in the POST body.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-request","json-response"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","NFT info endpoint","x402 NFT","Base USDC API","micropayment API","on-chain metadata"],"warnings":["No request or response schema documented — POST body format and metadata fields are unknown.","Only a single NFT token ID (37) is addressed by this endpoint; unclear if other token IDs are available at similar paths.","Provider landing page offers many API categories but none have detailed documentation beyond a title and price.","No robots.txt or agents.txt found; no OpenAPI spec available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/37/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/37/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI schema, no documented request/response format, no examples, and the NFT metadata content is entirely unspecified. The listing is effectively a stub with confirmed liveness and 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'/request':16,32 '0.02':15,31,118 '000':107 '0x8335':112 '20':106 '2913':113 '300':134 '37':41 '402':191 '6':123 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'accept':92 'access':145 'addit':208 'advertis':101,144 'ai/ml':67 'analyt':66 'api':58,138 'avail':162 'base':5,21,85,108,115 'base-network' 'bodi':216 'broader':51 'call':9,25 'challeng':100,192 'contain':182 'cost':104 'data':65 'decim':124 'descript':176 'detail':175 'document':153,196 'endpoint':3,19,34,74,89,163,184 'entir':148 'equal':117 'exact':130 'exampl':172 'field':201 'finance/web3':69 'gate':147 'id':40 'includ':205 'infer':68 'input':209 'json':97 'json-response' 'key':139 'land':159 'limit':142 'list':161 'live':186 'lowpaymentfee.com':44 'made':127 'maximum':103 'metadata':2,18,37,181,203 'micropay':152 'micropayment API' 'minim':155 'network':86 'nft':1,17,36,180 'nft-metadata' 'offer':59 'on-chain metadata' 'page':160 'paramet':210 'part':48 'pay':7,23,55 'pay-per-cal':6,22 'pay-per-request':54 'payload':173 'payment':78,125 'per':8,24,56,119 'platform':45 'post':93,215 'price':165 'protocol':79 'provid':63,157,169 'rate':141 'request':57,94,120 'request/response':170 'respons':204 'return':96,188 'schema':171 'scheme':131 'second':135 'serv':35 'servic':72 'settl':80 'span':64 'specif':88 'suit':52 'support':212 'timeout':136 'token':39 'token metadata' 'unclear':199 'unit':109 'usdc':13,29,82,111,121 'usdc-settlement' 'use':75,122 'util':71 'valid':190 'via':10,26,128 'whether':207 'without':194 'x402':11,27,77,99,151 'x402 NFT' 'x402-payment'","prices":[{"id":"edd860ef-031e-4a20-9d6b-6714a1442129","listingId":"1df9dd96-809c-42a5-af34-138fa9570c5e","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/37/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":"2026-04-21T18:32:28.115Z"}],"sources":[{"listingId":"1df9dd96-809c-42a5-af34-138fa9570c5e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/37/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.115Z","lastSeenAt":"2026-04-22T16:32:58.683Z"}],"details":{"listingId":"1df9dd96-809c-42a5-af34-138fa9570c5e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/37/metadata \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base with a 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/nfts/37/metadata"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/nfts/37/metadata"},{"claim":"All 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"}],"useCases":["Retrieving metadata for NFT token #37 programmatically","Integrating NFT display data into a dApp or marketplace","Demonstrating x402 micropayment-gated API access"],"bestFor":["Developers needing on-demand NFT metadata without API key management","Agents or bots that can settle USDC micropayments on Base","Exploring x402 protocol integration patterns"],"notFor":["Bulk retrieval of metadata for large NFT collections (single-token endpoint, no batch support documented)","Users who cannot transact in USDC on Base network","Applications requiring detailed schema documentation or SLA guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.31Z"},"updatedAt":"2026-04-22T16:32:58.683Z"}}