{"id":"34ea6205-4517-4aca-9355-06307c8455d3","shortId":"Mc5hv2","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 68 via the x402 payment protocol on the Base network. It accepts POST requests and returns JSON. Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, with a maximum amount of 20,000 base units — equivalent to $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required; access is granted instantly upon payment.\n\nThe endpoint is part of a broader platform at lowpaymentfee.com that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request. This specific endpoint (/api/v1/nfts/68/metadata) is not listed on the site's main catalog, but it follows the same x402 pattern and pricing as the other endpoints.\n\nThe x402 challenge was successfully captured (HTTP 402 with a well-formed accepts array), confirming the endpoint is live. However, no OpenAPI schema, request/response examples, or detailed documentation are available. The exact structure of the NFT metadata response is unknown — it is only described as application/json. The platform's docs, pricing, and README pages all resolve to a minimal \"Connect wallet\" prompt with no additional technical detail.","tags":[],"capabilities":["x402-payment","nft-metadata","usdc-settlement","base-network","pay-per-call","no-api-key"],"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","No request body or response body examples are documented anywhere","This specific NFT endpoint (/api/v1/nfts/68/metadata) is not listed on the provider's main API catalog — it may be experimental or unlisted","All documentation pages (pricing, README, /api) resolve to a minimal 'Connect wallet' page with no technical content","Only token ID 68 is addressable at this URL; generalizability to other token IDs is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/68/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/68/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 challenge, but there is no OpenAPI schema, no request/response examples, and no documentation beyond a generic landing page. The specific NFT metadata content and structure are entirely unknown. This is effectively a stub 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'/request':16,32 '0.02':15,31,78,132 '000':73 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':64 '20':72 '402':168 '6':83 '68':41 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'accept':52,174 'access':93 'addit':226 'ai/ml':122 'amount':70 'analyt':121 'api':86,118 'application/json':207 'array':175 'avail':191 'base':5,21,49,66,74 'base-network' 'broader':105 'call':9,25,117 'captur':166 'catalog':147 'challeng':163 'confirm':176 'connect':221 'contract':63 'data':120,125 'decim':84 'describ':205 'detail':188,228 'doc':211 'document':189 'endpoint':3,19,34,100,137,160,178 'equival':76 'exact':193 'exampl':186 'finance/web3':124 'follow':150 'form':173 'grant':95 'howev':181 'http':167 'id':40 'infer':123 'instant':96 'json':57 'key':87 'limit':90 'list':141 'live':180 'lowpaymentfee.com':108 'main':146 'maximum':69 'metadata':2,18,37,198 'minim':220 'network':50 'nft':1,17,36,197 'nft-metadata' 'no-api-key' 'offer':110 'on-chain metadata' 'openapi':183 'page':215 'part':102 'pattern':154 'pay':7,23,115 'pay-per-cal':6,22,114 'pay-per-call' 'pay-per-request NFT' 'payment':45,58,98 'per':8,24,79,116,133 'platform':106,209 'post':53 'price':130,156,212 'prompt':223 'protocol':46 'rate':89 'readm':214 'request':54,80,134 'request/response':185 'requir':92 'resolv':217 'respons':199 'return':56 'schema':184 'serv':35 'servic':128 'settl':60 'site':144 'span':119 'specif':136 'structur':194 'success':165 'technic':227 'token':39 'token metadata' 'unit':75 'unknown':201 'upon':97 'usdc':13,29,62,81 'usdc-settlement' 'use':82 'util':127 'varieti':112 'via':10,26,42 'wallet':222 'well':172 'well-form':171 'x402':11,27,44,153,162 'x402 NFT' 'x402-payment'","prices":[{"id":"2dcc5fbb-06f2-4f0d-a03b-e33f7ed35bd2","listingId":"34ea6205-4517-4aca-9355-06307c8455d3","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/68/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":"2026-04-21T18:32:32.606Z"}],"sources":[{"listingId":"34ea6205-4517-4aca-9355-06307c8455d3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/68/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.606Z","lastSeenAt":"2026-04-22T07:02:17.492Z"}],"details":{"listingId":"34ea6205-4517-4aca-9355-06307c8455d3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/68/metadata\n# Returns HTTP 402 with x402 payment challenge.\n# Attach an X-PAYMENT header with a valid USDC payment proof on Base to receive the metadata.","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 maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/68/metadata"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/68/metadata"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving metadata for a specific NFT (token 68) programmatically","Integrating NFT display data into wallets or marketplaces","Agent-driven NFT data lookups with micropayment settlement"],"bestFor":["Developers needing on-demand NFT metadata without API key management","AI agents that can settle x402 payments on Base","Low-volume or sporadic NFT metadata lookups at $0.02/call"],"notFor":["Bulk NFT metadata retrieval across many token IDs (only token 68 is exposed at this URL)","Users who cannot settle USDC payments on the Base network","Applications requiring detailed documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.735Z"},"updatedAt":"2026-04-22T07:02:17.492Z"}}