{"id":"4be0ed9e-564d-4f5b-ba4b-3e0871cfc0cd","shortId":"pW9nxu","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 x402-enabled endpoint at lowpaymentfee.com serves NFT metadata for token ID 4 via a POST request. Payment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 exact-payment scheme. The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD per request.\n\nThe provider's landing page advertises a broad suite of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments. However, this specific listing covers only the `/api/v1/nfts/4/metadata` endpoint, which returns NFT metadata in JSON format.\n\nThe endpoint is confirmed live — the probe received a proper HTTP 402 challenge with x402 version 1 headers. No OpenAPI schema, detailed documentation, or example responses were found in the crawl. The exact structure of the returned NFT metadata is unknown, so consumers should expect a standard JSON metadata object but verify the response shape at runtime.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata endpoint","NFT token info","on-chain metadata","x402 NFT API","Base USDC API","pay-per-call NFT"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Response structure for NFT metadata is undocumented — consumers must discover it empirically","Only token ID 4 is served at this specific path; generalizability to other token IDs is unclear","Provider site pages beyond the landing page returned only 'Connect wallet' with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/4/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/4/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 challenge with clear pricing. However, there is no OpenAPI schema, no documented request/response format, no example payloads, and no detailed documentation beyond the landing page listing. The specific NFT metadata content is entirely 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'/request':16,32 '0.02':15,31,87,138 '000':78 '0x8335':61 '1':184 '20':77 '2913':62 '4':46 '402':179 '6':83 'Base USDC API' 'NFT metadata API' 'NFT token info' 'advertis':96 'ai/ml':109 'amount':72 'analysi':112 'analyt':108 'api':105,143 'base':5,21,56,79 'base-network' 'broad':98 'call':9,25,75 'challeng':180 'classif':114 'commit':151 'confirm':171 'consum':210 'contract':60 'convers':131 'cover':156 'crawl':198 'data':107 'decim':84 'detail':189 'document':190 'embed':115 'enabl':36 'endpoint':3,19,37,134,160,169 'equal':86 'estim':125 'exact':67,200 'exact-pay':66 'exampl':192 'exchang':120 'expect':212 'feed':119 'financ':116 'format':167 'found':195 'gas':124 'generat':132 'geocod':129 'header':185 'howev':152 'http':178 'id':45 'infer':110 'infrastructur':127 'json':166,215 'key':144 'land':94 'limit':147 'list':136,155 'live':172 'lowpaymentfee.com':39 'maximum':71 'metadata':2,18,42,164,206,216 'minimum':150 'network':57 'nft':1,17,41,163,205 'nft-metadata' 'no-api-key' 'object':217 'on-chain metadata' 'openapi':187 'page':95 'pay':7,23,102 'pay-per-cal':6,22 'pay-per-call NFT' 'pay-per-request':101 'payment':51,68 'per':8,24,74,89,103,139 'post':49 'price':118 'probe':174 'proper':177 'provid':92 'quot':123 'rate':121,146 'receiv':175 'request':50,90,104,140 'requir':73 'respons':193,221 'return':162,204 'runtim':224 'schema':188 'scheme':69 'sentiment':111 'serv':40 'settl':53 'shape':222 'span':106 'specif':154 'standard':214 'structur':201 'suit':99 'summar':113 'token':44,122 'token metadata endpoint' 'unit':80 'unknown':208 'usd':88 'usdc':13,29,59,82 'usdc-settlement' 'use':58 'util':128 'valid':130 'verifi':219 'version':183 'via':10,26,47 'web3':117 'x402':11,27,35,65,182 'x402 NFT API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"1a06b60b-0b46-4691-89b3-a6dbfad2b582","listingId":"4be0ed9e-564d-4f5b-ba4b-3e0871cfc0cd","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/4/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":"2026-04-21T18:32:31.943Z"}],"sources":[{"listingId":"4be0ed9e-564d-4f5b-ba4b-3e0871cfc0cd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/4/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.943Z","lastSeenAt":"2026-04-22T10:33:05.664Z"}],"details":{"listingId":"4be0ed9e-564d-4f5b-ba4b-3e0871cfc0cd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/4/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":"The endpoint returns HTTP 402 with x402 version 1 challenge requiring USDC payment on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/4/metadata"},{"claim":"maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/nfts/4/metadata"},{"claim":"All APIs on the site are listed at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving metadata for a specific NFT (token ID 4) programmatically","Integrating NFT metadata into a dApp or marketplace without managing API keys","Demonstrating x402 micropayment-gated API access on Base"],"bestFor":["Developers needing on-demand NFT metadata without subscription overhead","Agents or bots that can settle USDC payments on Base automatically","Prototyping x402 payment flows with a low-cost endpoint"],"notFor":["Bulk retrieval of metadata across many NFT collections (only token ID 4 is exposed at this path)","Users who cannot transact USDC on the Base network","Production systems requiring documented response schemas and SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.711Z"},"updatedAt":"2026-04-22T10:33:05.664Z"}}