{"id":"0d8f75bd-640d-4bfa-be4d-d2087757eb01","shortId":"eH7wBE","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 85 via an x402 pay-per-call model. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with an exact-payment scheme. The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals). No API keys or rate limits are advertised; access is gated purely by the x402 payment header.\n\nThe provider, lowpaymentfee.com, hosts a broader catalog of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion). All listed endpoints share the same $0.02-per-request pricing. However, this specific listing covers only the `/api/v1/nfts/85/metadata` endpoint.\n\nThe endpoint is live and returns a proper 402 challenge with x402 version 1. No OpenAPI schema, detailed documentation, or example responses were found in the crawl. The exact structure of the returned NFT metadata is unknown, and there is no information about what NFT collection or project token 85 belongs to. The output MIME type is declared as application/json.","tags":[],"capabilities":["x402-payment","nft-metadata","base-network","usdc-settlement","pay-per-call","json-response"],"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 example request or response bodies found; response structure is unknown","Only serves metadata for a single NFT token ID (85); unclear what collection this belongs to","Provider site pages (/api, /pricing, /README) returned only 'Connect wallet' with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/85/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/85/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, but there is no OpenAPI schema, no documentation of request/response formats, no example payloads, and no information about what NFT collection token 85 belongs to. The listing is essentially a stub with only the payment challenge to go 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'/request':16,32 '0.02':15,31,92,157 '000':85 '0x8335':69 '1':184 '20':84 '2913':70 '402':179 '6':95 '85':43,220 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'accept':53 'access':105 'advertis':104 'ai/ml':130 'amount':79 'analysi':133 'analyt':129 'api':98,126 'application/json':230 'base':5,21,64,86 'base-network' 'belong':221 'broader':119 'call':9,25,50,82,125 'catalog':120 'challeng':180 'classif':135 'collect':216 'contract':68 'convers':150 'cover':166 'crawl':197 'data':128,138 'decim':96 'declar':228 'detail':188 'document':189 'embed':136 'endpoint':3,19,34,153,170,172 'equal':91 'estim':144 'exact':74,199 'exact-pay':73 'exampl':191 'exchang':141 'feed':140 'finance/web3':137 'found':194 'gas':143 'gate':107 'geocod':148 'header':113 'host':117 'howev':162 'id':42 'infer':131 'inform':212 'infrastructur':146 'json':58 'json-response' 'key':99 'limit':102 'list':152,165 'live':174 'lowpaymentfee.com':36,116 'maximum':78 'metadata':2,18,39,205 'mime':225 'model':51 'network':65 'nft':1,17,38,204,215 'nft-metadata' 'on-chain metadata' 'openapi':186 'output':224 'pay':7,23,48,123 'pay-per-cal':6,22,47,122 'pay-per-call' 'pay-per-request NFT' 'payment':59,75,112 'per':8,24,49,81,124,159 'per-request':158 'post':54 'price':139,161 'project':218 'proper':178 'provid':115 'pure':108 'rate':101,142 'request':55,160 'requir':80 'respons':192 'return':57,176,203 'schema':187 'scheme':76 'sentiment':132 'serv':37 'settl':61 'share':154 'span':127 'specif':164 'structur':200 'summar':134 'token':41,219 'token metadata' 'type':226 'unit':87 'unknown':207 'usdc':13,29,67,89,93 'usdc-settlement' 'use':66,94 'util':147 'valid':149 'version':183 'via':10,26,44 'x402':11,27,46,111,182 'x402 NFT' 'x402-payment'","prices":[{"id":"5165b462-5908-4052-8c6a-a89a0b7378ea","listingId":"0d8f75bd-640d-4bfa-be4d-d2087757eb01","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/85/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":"2026-04-21T18:32:32.571Z"}],"sources":[{"listingId":"0d8f75bd-640d-4bfa-be4d-d2087757eb01","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/85/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.571Z","lastSeenAt":"2026-04-22T07:02:17.451Z"}],"details":{"listingId":"0d8f75bd-640d-4bfa-be4d-d2087757eb01","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/85/metadata \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 version 1 challenge, maxAmountRequired 20000 USDC base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/85/metadata"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/85/metadata"},{"claim":"All listed endpoints share $0.02/request pricing with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving metadata for NFT token ID 85 from this provider","Integrating NFT metadata lookups into agent workflows with micropayments","Demonstrating x402 pay-per-call patterns for NFT data"],"bestFor":["Agents needing NFT metadata with no API key signup","Developers exploring x402 micropayment-gated APIs","Quick one-off NFT metadata lookups settled in USDC on Base"],"notFor":["Bulk NFT metadata retrieval across many collections (only one token ID served here)","Users who need free or subscription-based NFT metadata APIs","Querying NFT metadata on networks other than Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.768Z"},"updatedAt":"2026-04-22T07:02:17.451Z"}}