{"id":"9cd4fbf4-c2d8-4198-adeb-b41b67f184e8","shortId":"mCGphR","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 79 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, which equals $0.02 given USDC's 6 decimals. No API keys or rate limits are required — each call is individually paid through the x402 X-PAYMENT header.\n\nThe endpoint is part of a broader platform at lowpaymentfee.com that offers dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced at $0.02 per request. The specific endpoint at /api/v1/nfts/79/metadata appears to return NFT metadata (likely conforming to a standard metadata JSON schema with fields such as name, description, image, and attributes), though the exact response schema is not documented.\n\nThe endpoint was confirmed live via a 402 challenge response. The x402 challenge specifies version 1, the \"exact\" payment scheme, a 300-second timeout, and outputs application/json. The platform advertises no minimums, no commitments, and instant access. Documentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no additional technical detail.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","ERC-721 metadata","NFT attributes","on-chain metadata","x402 NFT endpoint","Base USDC API"],"warnings":["No API documentation available — /api, /pricing, and /README pages only show a wallet-connect prompt","Response schema for NFT metadata is not documented; field structure is inferred","This endpoint is scoped to a single token ID (79); no documentation on other token IDs or collections","Platform appears to list many diverse API categories but none have visible documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/79/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/79/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","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 documented request/response format, no examples, and the broader site pages are empty beyond a wallet-connect prompt. The specific NFT metadata content is unknown. This is effectively a stub 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'/api/v1/nfts/79/metadata':143 '/pricing':220 '/readme':222 '/request':16,32 '0.02':15,31,78,136 '000':73 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':64 '1':189 '20':72 '300':195 '402':181 '6':82 '79':41 'Base USDC API' 'ERC-721 metadata' 'NFT attributes' 'NFT metadata API' 'accept':52 'access':210 'addit':234 'advertis':203 'ai/ml':126 'amount':70 'analyt':125 'api':85,122 'appear':144 'application/json':200 'attribut':165 'base':5,21,49,66,74 'base-network' 'beyond':212 'broader':110 'call':9,25,93,121 'challeng':182,186 'commit':207 'confirm':177 'conform':150 'connect':230 'contract':63 'data':124,129 'decim':83 'descript':162 'detail':236 'document':173,211 'dozen':116 'endpoint':3,19,34,105,141,175 'equal':77 'exact':168,191 'field':158 'finance/web3':128 'given':79 'header':103 'id':40 'imag':163 'individu':95 'infer':127 'infrastructur':131 'instant':209 'json':57,155 'key':86 'land':214 'like':149 'limit':89 'live':178 'lowpaymentfee.com':113 'maximum':69 'metadata':2,18,37,148,154 'minimum':205 'name':161 'network':50 'nft':1,17,36,147 'nft-metadata' 'no-api-key' 'offer':115 'on-chain metadata' 'output':199 'page':215,223 'paid':96 'part':107 'pay':7,23,119 'pay-per-cal':6,22,118 'pay-per-call' 'payment':45,58,102,192 'per':8,24,120,137 'platform':111,202 'post':53 'price':134 'prompt':231 'protocol':46 'rate':88 'request':54,138 'requir':91 'resolv':225 'respons':169,183 'return':56,146 'schema':156,170 'scheme':193 'second':196 'serv':35 'settl':60 'span':123 'spars':217 'specif':140 'specifi':187 'standard':153 'technic':235 'though':166 'timeout':197 'token':39 'token metadata' 'unit':75 'usdc':13,29,62,80 'usdc-settlement' 'util':132 'version':188 'via':10,26,42,179 'wallet':229 'wallet-connect':228 'x':101 'x-payment':100 'x402':11,27,44,99,185 'x402 NFT endpoint' 'x402-payment'","prices":[{"id":"8181b353-c86d-4616-8543-23759537c725","listingId":"9cd4fbf4-c2d8-4198-adeb-b41b67f184e8","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/79/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":"2026-04-21T18:32:32.672Z"}],"sources":[{"listingId":"9cd4fbf4-c2d8-4198-adeb-b41b67f184e8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/79/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.672Z","lastSeenAt":"2026-04-22T07:02:17.571Z"}],"details":{"listingId":"9cd4fbf4-c2d8-4198-adeb-b41b67f184e8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/79/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":"Endpoint returns 402 with x402 challenge advertising USDC payment on Base network at maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/nfts/79/metadata"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/79/metadata"}],"useCases":["Fetching NFT metadata (name, image, attributes) for token ID 79 programmatically","Integrating pay-per-call NFT data into agent workflows without managing API keys","Building NFT galleries or explorers that pull metadata on demand"],"bestFor":["Agents or apps needing on-demand NFT metadata without subscription overhead","Developers experimenting with x402 micropayment-gated APIs","Low-volume or sporadic NFT metadata lookups at $0.02 per call"],"notFor":["Bulk retrieval of metadata across many token IDs (no batch endpoint documented)","Use cases requiring free or subscription-based access to NFT metadata","Production systems needing detailed API documentation and SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.648Z"},"updatedAt":"2026-04-22T07:02:17.571Z"}}