{"id":"eec2f4a8-829a-45d4-8ddf-4362bc2e4f77","shortId":"ZXHSPK","kind":"x402","title":"NFT metadata endpoint on Base, pay-per-call via x402 with USDC (~$0.02/request).","tagline":"NFT metadata endpoint on Base, pay-per-call via x402 with USDC (~$0.02/request).","description":"This endpoint at lowpaymentfee.com serves NFT metadata for token ID 48 via a POST request, gated by the x402 payment protocol. Each call costs up to 20,000 base units of USDC on the Base network, which translates to $0.02 (USD Coin uses 6 decimals). No API keys or accounts are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe provider, lowpaymentfee.com, hosts a broader suite of pay-per-call APIs spanning data & analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints appear to share the same $0.02/request pricing and x402 payment model on Base. This specific endpoint (`/api/v1/nfts/48/metadata`) returns application/json content, presumably containing on-chain NFT metadata fields such as name, description, image URI, and attributes.\n\nThe endpoint is live and returned a proper 402 challenge when probed. However, there is no OpenAPI schema, no documentation beyond the landing page listing, and no example request/response payloads available. The actual structure of the returned NFT metadata is unknown.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-base","pay-per-call","no-api-key","json-response"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata endpoint","NFT attributes API","on-chain metadata","Base network NFT","x402 NFT","pay-per-request NFT"],"warnings":["No OpenAPI or schema documentation available for this endpoint","No example request or response payloads; actual metadata structure is unknown","Endpoint is scoped to a single NFT token ID (48); unclear if other token IDs are available","The broader lowpaymentfee.com site pages (/api, /pricing, /README) returned only 'Connect wallet' with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/48/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/48/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, confirming it is operational. However, there is no OpenAPI schema, no documentation of request/response formats, no example payloads, and the endpoint serves metadata for only a single hardcoded token ID (48). The broader site lists many endpoints but provides no detailed docs for any of 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'/request':15,30,142 '0.02':14,29,70,141 '000':58 '20':57 '402':181 '48':41 '6':74 'Base network NFT' 'NFT attributes API' 'NFT metadata API' 'account':80 'actual':205 'ai/ml':113 'analyt':112 'api':77,109 'appear':136 'application/json':155 'attach':85 'attribut':172 'avail':203 'base':5,20,59,65,149 'beyond':193 'broader':102 'call':9,24,53,108 'caller':83 'chain':161 'challeng':182 'classif':117 'coin':72 'contain':158 'content':156 'convers':132 'cost':54 'data':111 'decim':75 'descript':168 'document':192 'embed':118 'endpoint':3,18,32,135,152,174 'estim':126 'exampl':200 'exchang':123 'feed':122 'field':164 'financ':119 'gas':125 'gate':46 'generat':133 'geocod':130 'header':90 'host':100 'howev':185 'id':40 'imag':169 'infer':114 'infrastructur':128 'json-response' 'key':78 'land':195 'list':197 'live':176 'lowpaymentfee.com':34,99 'metadata':2,17,37,163,211 'model':147 'name':167 'network':66 'nft':1,16,36,162,210 'nft-metadata' 'no-api-key' 'on-chain':159 'on-chain metadata' 'openapi':189 'page':196 'pay':7,22,106 'pay-per-cal':6,21,105 'pay-per-call' 'pay-per-request NFT' 'payload':202 'payment':50,89,95,146 'per':8,23,107 'post':44 'presum':157 'price':121,143 'probe':184 'proof':96 'proper':180 'protocol':51 'provid':98 'rate':124 'request':45 'request/response':201 'requir':82 'return':154,178,209 'schema':190 'sentiment':115 'serv':35 'share':138 'simpli':84 'span':110 'specif':151 'structur':206 'suit':103 'summar':116 'token':39 'token metadata endpoint' 'translat':68 'unit':60 'unknown':213 'uri':170 'usd':71 'usdc':13,28,62 'usdc-base' 'use':73 'util':129 'valid':93,131 'via':10,25,42 'web3':120 'x':88 'x-payment':87 'x402':11,26,49,94,145 'x402 NFT' 'x402-payment'","prices":[{"id":"f381ddd9-a84e-46d8-bfdb-97037f375088","listingId":"eec2f4a8-829a-45d4-8ddf-4362bc2e4f77","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/48/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":"2026-04-21T18:32:28.153Z"}],"sources":[{"listingId":"eec2f4a8-829a-45d4-8ddf-4362bc2e4f77","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/48/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.153Z","lastSeenAt":"2026-04-22T16:32:58.717Z"}],"details":{"listingId":"eec2f4a8-829a-45d4-8ddf-4362bc2e4f77","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/48/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 endpoint returns a 402 challenge with maxAmountRequired of 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/48/metadata"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/48/metadata"},{"claim":"All listed APIs cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching NFT metadata (name, image, attributes) for token ID 48 programmatically","Integrating NFT display data into wallets, marketplaces, or galleries","Agent-driven NFT data retrieval without API key management"],"bestFor":["Developers needing quick, keyless access to specific NFT metadata","AI agents that can settle micropayments via x402 on Base","Prototyping NFT-aware applications without signing up for an API provider"],"notFor":["Bulk retrieval of metadata across many NFT collections (only one token ID served here)","Users who need free or subscription-based NFT metadata APIs","Production systems requiring documented schemas and SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.211Z"},"updatedAt":"2026-04-22T16:32:58.717Z"}}