{"id":"30dd3058-144e-46a1-a08e-a46959103c23","shortId":"hzjtX2","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 7 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 or accounts are needed — callers attach an X-PAYMENT header with a valid x402 payment proof and receive JSON metadata in return.\n\nThe provider hosts a broader suite of pay-per-call APIs across data analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation), all uniformly priced at $0.02 per request. This specific endpoint focuses on NFT metadata retrieval. The x402 challenge confirms the endpoint is live, accepts USDC on Base (contract 0x8335…2913), and pays out to 0x1A2B…85F3 with a 300-second payment timeout.\n\nBecause there is no OpenAPI schema, no request/response body documentation, and no example payloads beyond the x402 challenge itself, the exact structure of the NFT metadata response and any required POST body fields are unknown. Callers should expect a JSON response (mimeType: application/json) but will need to experiment or contact the provider for field-level details.","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","NFT info endpoint","x402 NFT","Base USDC API","pay-per-request NFT","lowpaymentfee"],"warnings":["No OpenAPI or request/response schema available — POST body requirements are unknown","Only token ID 7 is confirmed; unclear if other IDs are supported at different paths","No documentation pages rendered useful content (pricing, README, and /api pages only show 'Connect wallet')","The provider lists many API categories but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/7/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/7/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documented request body, no example response, and no details about what metadata fields are returned. The endpoint is confirmed live via 402 but actual functionality is 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'0.02':15,31,57,73,141 '000':67 '0x1a2b':171 '0x8335':165 '20':66 '2913':166 '300':175 '6':71 '7':43 '85f3':172 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'accept':160 'account':78 'across':112 'ai/ml':115 'analyt':114 'api':75,111 'application/json':221 'attach':82 'base':5,21,62,68,163 'beyond':193 'bodi':187,210 'broader':104 'call':9,25,55,110 'caller':81,214 'challeng':154,196 'classif':119 'confirm':155 'contact':228 'contract':164 'convers':135 'cost':56 'data':113 'decim':72 'detail':235 'document':188 'embed':120 'endpoint':3,19,34,146,157 'estim':129 'exact':199 'exampl':191 'exchang':124 'expect':216 'experi':226 'feed':123 'field':211,233 'field-level':232 'finance/web3':121 'focus':147 'gas':128 'gate':48 'generat':136 'geocod':133 'header':87 'host':102 'id':42 'infer':116 'infrastructur':131 'json':96,218 'json-response' 'key':76 'level':234 'live':159 'lowpaymentfee' 'lowpaymentfee.com':36 'maxamountrequir':64 'metadata':2,18,39,97,150,204 'mimetyp':220 'need':80,224 'network':63 'nft':1,17,38,149,203 'nft-metadata' 'no-api-key' 'openapi':183 'pay':7,23,108,168 'pay-per-cal':6,22,107 'pay-per-call' 'pay-per-request NFT' 'payload':192 'payment':52,86,92,177 'per':8,24,109,142 'post':46,209 'price':122,139 'proof':93 'protocol':53 'provid':101,230 'quot':127 'rate':125 'receiv':95 'request':47,143 'request/response':186 'requir':208 'respons':205,219 'retriev':151 'return':99 'schema':184 'second':176 'sentiment':117 'serv':37 'specif':145 'structur':200 'suit':105 'summar':118 'timeout':178 'token':41,126 'token metadata' 'uniform':138 'unit':69 'unknown':213 'usdc':13,29,59,161 'usdc-base' 'util':132 'valid':90,134 'via':10,26,44 'x':85 'x-payment':84 'x402':11,27,51,91,153,195 'x402 NFT' 'x402-payment'","prices":[{"id":"d0f7dfc4-7a03-477c-a2a5-e9bb4db68071","listingId":"30dd3058-144e-46a1-a08e-a46959103c23","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/7/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":"2026-04-21T18:32:32.485Z"}],"sources":[{"listingId":"30dd3058-144e-46a1-a08e-a46959103c23","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/7/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.485Z","lastSeenAt":"2026-04-22T09:02:26.237Z"}],"details":{"listingId":"30dd3058-144e-46a1-a08e-a46959103c23","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/7/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 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/nfts/7/metadata"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/nfts/7/metadata"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/7/metadata"},{"claim":"Provider advertises uniform $0.02/request pricing with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Provider lists APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving on-chain NFT metadata for display in wallets or marketplaces","Programmatic access to NFT attributes for indexing or analytics","Agent-driven NFT data fetching without pre-registration or API keys"],"bestFor":["Developers needing quick, keyless NFT metadata lookups","AI agents that can settle micropayments via x402 on Base","Projects wanting pay-as-you-go access without subscriptions"],"notFor":["Bulk metadata retrieval across thousands of NFTs (no batch endpoint documented)","Users who need metadata for token IDs other than 7 (only ID 7 is confirmed at this URL)","Anyone requiring detailed schema documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.951Z"},"updatedAt":"2026-04-22T09:02:26.237Z"}}