{"id":"a8dd3a9e-9fa5-4279-bfb5-4585a317fee1","shortId":"pugM2m","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 92 via a pay-per-request x402 protocol on the Base network. It accepts POST requests and returns JSON. Payment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of $0.02 per request (20,000 base units with 6 decimals). No API keys, rate limits, or subscriptions are required — each call is individually paid through the x402 payment header.\n\nThe endpoint is part of a broader platform at lowpaymentfee.com that offers a variety of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request. The specific endpoint at `/api/v1/nfts/92/metadata` appears to be an NFT metadata service, though the crawled documentation does not provide details about the schema of the returned metadata or which NFT collection it references.\n\nThe x402 challenge was successfully captured (HTTP 402 with version 1 challenge), confirming the endpoint is live. However, no OpenAPI schema, detailed documentation, or example responses were found in the crawl. The endpoint's output format and fields are unknown beyond the declared MIME type of `application/json`.","tags":[],"capabilities":["x402-payment","nft-metadata","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","NFT token info","on-chain metadata","x402 NFT endpoint","Base USDC API","pay-per-call NFT"],"warnings":["No documentation found describing the NFT metadata response schema or which collection is served","Endpoint is specific to a single token ID (92); unclear if other token IDs are available at similar paths","No OpenAPI spec, no example responses, and crawled pages beyond the homepage returned only 'Connect wallet' with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/92/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/92/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no example request/response, no documentation about what metadata fields are returned, and no information about which NFT collection token 92 belongs to. This is effectively a stub 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'/request':16,32 '0.02':15,31,76,137 '000':80 '0x8335':67 '1':183 '20':79 '2913':68 '402':180 '6':84 '92':41 'Base USDC API' 'NFT metadata API' 'NFT token info' 'accept':55 'ai/ml':127 'analyt':126 'api':87,123 'appear':145 'application/json':219 'base':5,21,52,70,81 'base-network' 'beyond':213 'broader':111 'call':9,25,96 'captur':178 'challeng':175,184 'collect':170 'confirm':185 'contract':66 'cost':74 'crawl':154,203 'data':125,130 'decim':85 'declar':215 'detail':159,194 'document':155,195 'endpoint':3,19,34,106,142,187,205 'exampl':197 'field':210 'finance/web3':129 'format':208 'found':200 'gate':122 'header':104 'howev':190 'http':179 'id':40 'individu':98 'infer':128 'infrastructur':132 'json':60 'key':88 'limit':90 'live':189 'lowpaymentfee.com':114 'maximum':73 'metadata':2,18,37,150,166 'mime':216 'network':53 'nft':1,17,36,149,169 'nft-metadata' 'no-api-key' 'offer':116 'on-chain metadata' 'openapi':192 'output':207 'paid':99 'part':108 'pay':7,23,45 'pay-per-cal':6,22 'pay-per-call NFT' 'pay-per-request':44 'payment':61,103 'per':8,24,46,77,138 'platform':112 'post':56 'price':135 'protocol':49 'provid':158 'rate':89 'refer':172 'request':47,57,78,139 'requir':94 'respons':198 'return':59,165 'schema':162,193 'serv':35 'servic':151 'settl':63 'span':124 'specif':141 'subscript':92 'success':177 'though':152 'token':39 'token metadata' 'type':217 'unit':82 'unknown':212 'usdc':13,29,65 'usdc-settlement' 'util':133 'varieti':118 'version':182 'via':10,26,42 'x402':11,27,48,102,121,174 'x402 NFT endpoint' 'x402-gated':120 'x402-payment'","prices":[{"id":"1155675e-831b-4559-823d-300ca69f7576","listingId":"a8dd3a9e-9fa5-4279-bfb5-4585a317fee1","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/92/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":"2026-04-21T18:32:32.631Z"}],"sources":[{"listingId":"a8dd3a9e-9fa5-4279-bfb5-4585a317fee1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/92/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.631Z","lastSeenAt":"2026-04-22T07:02:17.503Z"}],"details":{"listingId":"a8dd3a9e-9fa5-4279-bfb5-4585a317fee1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/92/metadata \\\n  -H \"X-PAYMENT: <x402_payment_header>\" \\\n  -H \"Content-Type: application/json\"","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/92/metadata"},{"claim":"Payment is in USDC on Base network at maxAmountRequired of 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/nfts/92/metadata"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving metadata for NFT token ID 92 programmatically","Integrating NFT metadata into wallets or marketplaces without API key management","Agent-driven NFT data retrieval with micropayment settlement"],"bestFor":["Agents or apps needing on-demand NFT metadata without subscription overhead","Developers experimenting with x402 pay-per-call patterns on Base","Low-volume or sporadic NFT metadata lookups"],"notFor":["Bulk retrieval of metadata across many NFT collections (only serves token 92)","Users who need free or pre-paid API access without crypto wallets","Applications requiring detailed documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.791Z"},"updatedAt":"2026-04-22T07:02:17.503Z"}}