{"id":"3bca8dd1-a0bb-4ac2-8dd8-7393e6144fff","shortId":"cbKPJT","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 at lowpaymentfee.com serves NFT metadata for token ID 27 via a POST request, gated by the x402 payment protocol. Each call costs $0.02 in USDC on the Base network (maxAmountRequired of 20,000 base units with 6 decimals = $0.02). No API keys, rate limits, or subscriptions are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe provider's site 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). All endpoints appear to share the same $0.02/request pricing and x402 payment model on Base. However, this specific listing covers only the `/api/v1/nfts/27/metadata` endpoint, which returns NFT metadata in JSON format.\n\nThe endpoint is live and returns a proper 402 challenge with x402 version 1. The payment asset is USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, paid to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. No OpenAPI schema or detailed documentation was found beyond the landing page listing and the 402 challenge itself, so the exact shape of the returned metadata is unknown.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-base","pay-per-call","json-response","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 — response format is unknown","Only a single NFT token ID (27) is exposed at this path; unclear if other token IDs are available at sibling paths","No crawled docs beyond a landing page listing; /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/27/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/27/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI schema, no documentation of request/response shapes, and no example payloads. The NFT metadata content is entirely unknown. Score reflects a working but poorly documented 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'/request':16,32,141 '0.02':15,31,57,73,140 '000':67 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':191 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':185 '1':178 '20':66 '27':43 '402':173,207 '6':71 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'address':190 'ai/ml':114 'analyt':113 'api':75,110 'appear':135 'asset':181 'attach':85 'base':5,21,62,68,148,187 'beyond':200 'broader':103 'call':9,25,55,109 'caller':83 'challeng':174,208 'classif':118 'contract':184 'convers':132 'cost':56 'cover':153 'data':112 'decim':72 'detail':196 'document':197 'embed':119 'endpoint':3,19,34,134,157,166 'estim':126 'exact':212 'exchang':123 'feed':122 'finance/web3':120 'format':164 'found':199 'gas':125 'gate':48 'geocod':130 'header':90 'host':101 'howev':149 'id':42 'infer':115 'infrastructur':128 'json':163 'json-response' 'key':76 'land':202 'limit':78 'list':152,204 'live':168 'lowpaymentfee.com':36 'maxamountrequir':64 'metadata':2,18,39,161,217 'model':146 'network':63 'nft':1,17,38,160 'nft-metadata' 'no-api-key' 'on-chain metadata' 'openapi':193 'page':203 'paid':188 'pay':7,23,107 'pay-per-cal':6,22,106 'pay-per-call' 'pay-per-request NFT' 'payment':52,89,95,145,180 'per':8,24,108 'post':46 'price':121,142 'proof':96 'proper':172 'protocol':53 'provid':98 'rate':77,124 'request':47 'requir':82 'return':159,170,216 'schema':194 'sentiment':116 'serv':37 'shape':213 'share':137 'simpli':84 'site':100 'span':111 'specif':151 'subscript':80 'suit':104 'summar':117 'token':41 'token metadata' 'unit':69 'unknown':219 'usdc':13,29,59,183 'usdc-base' 'util':129 'valid':93,131 'version':177 'via':10,26,44 'x':88 'x-payment':87 'x402':11,27,51,94,144,176 'x402 NFT' 'x402-payment'","prices":[{"id":"cc7713bb-fa50-4f68-8597-01e7752b11e4","listingId":"3bca8dd1-a0bb-4ac2-8dd8-7393e6144fff","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/27/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":"2026-04-21T18:32:27.855Z"}],"sources":[{"listingId":"3bca8dd1-a0bb-4ac2-8dd8-7393e6144fff","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/27/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.855Z","lastSeenAt":"2026-04-22T19:33:08.937Z"}],"details":{"listingId":"3bca8dd1-a0bb-4ac2-8dd8-7393e6144fff","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/27/metadata \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 version 1 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/nfts/27/metadata"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/nfts/27/metadata"},{"claim":"Payment asset is USDC at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/27/metadata"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving metadata for a specific NFT (token 27) programmatically","Integrating NFT display data into wallets or marketplaces","Agent-driven NFT data lookups with automatic micropayment settlement"],"bestFor":["Developers needing NFT metadata without managing API keys","Agents that can settle x402 payments on Base","Low-volume, on-demand NFT data retrieval"],"notFor":["Bulk retrieval of metadata across many NFT collections (only token 27 is exposed at this path)","Users who cannot transact in USDC on Base","Applications requiring detailed OpenAPI documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.702Z"},"updatedAt":"2026-04-22T19:33:08.937Z"}}