{"id":"f68aa5f7-4495-4c3d-8fd4-c124575dfac8","shortId":"aapBmc","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 44 via a pay-per-request x402 protocol on the Base network. It accepts POST requests and returns JSON. Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, with a maximum cost of $0.02 per call (20,000 base units at 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe endpoint is part of a broader platform at lowpaymentfee.com that offers dozens of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced uniformly at $0.02 per request. This specific endpoint (/api/v1/nfts/44/metadata) is focused on NFT metadata retrieval, though the platform does not document the exact schema of the returned metadata object.\n\nThe endpoint was confirmed live via a 402 challenge response. The x402 challenge specifies version 1, scheme \"exact\", a 300-second payment timeout, and outputs application/json. No OpenAPI spec, detailed documentation, or example responses were found in the crawl, so the exact structure of the metadata payload is unknown.","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","NFT info endpoint","on-chain metadata","x402 NFT","Base USDC API","pay-per-call NFT"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Response payload structure is completely undocumented","Endpoint appears to serve metadata for only a single NFT (token ID 44) — unclear if other token IDs are available at different paths","Most site pages (pricing, README, api) returned no meaningful content beyond 'Connect wallet'","The platform lists many API categories but none appear to have detailed docs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/44/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/44/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 (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation of the request body or response schema, no example responses, and the endpoint only serves a single NFT token ID. The crawl pages beyond the homepage returned only 'Connect wallet' with no useful 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'/request':16,32 '0.02':15,31,75,139 '000':79 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':67 '1':181 '20':78 '300':185 '402':173 '44':41 '6':83 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'accept':55 'ai/ml':128 'analyt':127 'api':86,124 'application/json':191 'attach':95 'base':5,21,52,69,80 'base-network' 'broader':113 'call':9,25,77 'caller':93 'challeng':174,178 'confirm':169 'contract':66 'cost':73 'crawl':204 'data':126,131 'decim':84 'detail':195 'document':157,196 'dozen':119 'endpoint':3,19,34,108,144,167 'exact':159,183,207 'exampl':198 'finance/web3':130 'focus':147 'found':201 'gate':123 'header':100 'id':40 'infer':129 'infrastructur':133 'json':60 'key':87 'limit':90 'live':170 'lowpaymentfee.com':116 'maximum':72 'metadata':2,18,37,150,164,211 'network':53 'nft':1,17,36,149 'nft-metadata' 'no-api-key' 'object':165 'offer':118 'on-chain metadata' 'openapi':193 'output':190 'part':110 'pay':7,23,45 'pay-per-cal':6,22 'pay-per-call NFT' 'pay-per-request':44 'payload':212 'payment':61,99,105,187 'per':8,24,46,76,140 'platform':114,154 'post':56 'price':136 'proof':106 'protocol':49 'rate':89 'request':47,57,141 'requir':92 'respons':175,199 'retriev':151 'return':59,163 'schema':160 'scheme':182 'second':186 'serv':35 'settl':63 'simpli':94 'span':125 'spec':194 'specif':143 'specifi':179 'structur':208 'though':152 'timeout':188 'token':39 'token metadata' 'uniform':137 'unit':81 'unknown':214 'usdc':13,29,65 'usdc-settlement' 'util':134 'valid':103 'version':180 'via':10,26,42,171 'x':98 'x-payment':97 'x402':11,27,48,104,122,177 'x402 NFT' 'x402-gated':121 'x402-payment'","prices":[{"id":"35a4bbd9-20aa-4384-9f8d-d7818a6c2081","listingId":"f68aa5f7-4495-4c3d-8fd4-c124575dfac8","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/44/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":"2026-04-21T18:32:28.286Z"}],"sources":[{"listingId":"f68aa5f7-4495-4c3d-8fd4-c124575dfac8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/44/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.286Z","lastSeenAt":"2026-04-22T15:03:11.606Z"}],"details":{"listingId":"f68aa5f7-4495-4c3d-8fd4-c124575dfac8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/44/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 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/44/metadata"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/44/metadata"}],"useCases":["Retrieving metadata for NFT token ID 44 from this provider","Integrating pay-per-call NFT data into agent workflows without API key management","Demonstrating x402 micropayment protocol usage on Base"],"bestFor":["Agents needing NFT metadata with zero signup friction","Developers experimenting with x402 payment protocol on Base","Low-volume, on-demand NFT data retrieval"],"notFor":["Bulk NFT metadata indexing across many collections (only serves token 44)","Users who need free or pre-paid API access without crypto wallets","Production systems requiring documented response schemas and SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.063Z"},"updatedAt":"2026-04-22T15:03:11.606Z"}}