{"id":"f78bbe9e-30fd-4f76-bf0d-9ac016a856ee","shortId":"rWsKnH","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 28 via a POST request, gated by the x402 payment protocol. It is hosted on lowpaymentfee.com, a platform that offers a broad catalog of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all settled on the Base network using USDC.\n\nThe specific endpoint at `/api/v1/nfts/28/metadata` costs $0.02 per request (20,000 base units of USDC with 6 decimals). Payment is made inline via the X-PAYMENT header; no API keys, accounts, or rate limits are required. The x402 challenge confirms the endpoint is live, accepting the \"exact\" payment scheme on Base mainnet, paying to address 0x1A2B…85F3, with a 300-second payment timeout. The response MIME type is `application/json`.\n\nBeyond this NFT metadata endpoint, the platform advertises additional APIs at similar pricing ($0.02/request) including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, and more. However, no OpenAPI schema, request/response examples, or detailed documentation were found for any endpoint. The actual structure of the NFT metadata returned is unknown — the listing is based solely on the x402 challenge and the provider's landing page.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["nft","web3"],"synonyms":["NFT metadata API","token metadata","NFT info endpoint","x402 NFT","Base USDC API","pay-per-call NFT"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Response body structure is completely unknown — no examples or field descriptions found","Endpoint is hardcoded to NFT token ID 28; unclear if other token IDs are available at similar paths","Landing page lists many APIs but /api, /pricing, and /README pages all returned only 'Connect wallet' with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/28/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/28/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 x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request body documentation, no example responses, and no description of what the NFT metadata actually contains. The endpoint is scoped to a single token ID with no broader 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'/request':16,32,171 '0.02':15,31,93,170 '000':97 '0x1a2b':143 '20':96 '28':41 '300':147 '6':103 '85f3':144 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'accept':132 'account':118 'actual':201 'addit':165 'address':142 'advertis':164 'ai/ml':73 'analysi':174 'analyt':72 'api':69,116,166 'application/json':156 'base':5,21,83,98,138,213 'base-network' 'beyond':157 'broad':62 'call':9,25 'catalog':63 'challeng':126,218 'classif':177 'confirm':127 'cost':92 'data':71 'decim':104 'detail':193 'document':194 'embed':178 'endpoint':3,19,34,89,129,161,199 'exact':134 'exampl':191 'exchang':181 'feed':180 'finance/web3':75 'found':196 'gate':46 'geocod':183 'header':114 'host':54 'howev':186 'id':40 'includ':172 'infer':74 'infrastructur':77 'inlin':108 'key':117 'land':223 'limit':121 'list':211 'live':131 'lowpaymentfee.com':56 'made':107 'mainnet':139 'metadata':2,18,37,160,206 'mime':153 'network':84 'nft':1,17,36,159,205 'nft-metadata' 'no-api-key' 'offer':60 'openapi':188 'page':224 'pay':7,23,66,140 'pay-per-cal':6,22 'pay-per-call NFT' 'pay-per-request':65 'payment':50,105,113,135,149 'per':8,24,67,94 'platform':58,163 'post':44 'price':169,179 'protocol':51 'provid':221 'rate':120,182 'request':45,68,95 'request/response':190 'requir':123 'respons':152 'return':207 'schema':189 'scheme':136 'second':148 'sentiment':173 'serv':35 'settl':80 'similar':168 'sole':214 'span':70 'specif':88 'structur':202 'summar':176 'text':175 'timeout':150 'token':39 'token metadata' 'type':154 'unit':99 'unknown':209 'usdc':13,29,86,101 'usdc-settlement' 'use':85 'util':78 'via':10,26,42,109 'x':112 'x-payment':111 'x402':11,27,49,125,217 'x402 NFT' 'x402-payment'","prices":[{"id":"9f73525b-d042-410d-ae78-3c07b4dbc111","listingId":"f78bbe9e-30fd-4f76-bf0d-9ac016a856ee","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/28/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":"2026-04-21T18:32:28.003Z"}],"sources":[{"listingId":"f78bbe9e-30fd-4f76-bf0d-9ac016a856ee","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/28/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.003Z","lastSeenAt":"2026-04-22T18:05:11.084Z"}],"details":{"listingId":"f78bbe9e-30fd-4f76-bf0d-9ac016a856ee","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/28/metadata \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge accepting USDC on Base network at 20,000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/nfts/28/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: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/28/metadata"}],"useCases":["Fetching on-chain NFT metadata for display in wallets or marketplaces","Programmatic retrieval of NFT attributes for indexing or analytics","Agent-driven NFT data lookup without pre-registration or API keys"],"bestFor":["Agents needing NFT metadata without account setup","Low-volume, on-demand NFT data retrieval","Developers experimenting with x402 micropayments on Base"],"notFor":["Bulk or high-throughput NFT metadata indexing (no documented batch endpoint)","Users who need detailed documentation or response schema guarantees before integrating","Querying arbitrary NFT token IDs (this endpoint is scoped to token 28)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.551Z"},"updatedAt":"2026-04-22T18:05:11.084Z"}}