{"id":"e14fc7a6-da06-4aee-983a-04f64722d561","shortId":"SpQgyj","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 77 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 call (20,000 base units with 6 decimals). No API keys, rate limits, or subscriptions are required — each request is individually paid via the X-PAYMENT header.\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. The specific endpoint probed here (/api/v1/nfts/77/metadata) falls outside those listed categories and appears to serve on-chain NFT metadata. The platform advertises no minimums, no commitments, and instant access.\n\nBecause no OpenAPI schema, request/response examples, or detailed documentation were found for this specific NFT metadata endpoint, the exact request body format and response structure are unknown. The x402 challenge confirms the endpoint is live and accepting payment-gated POST requests. Users should expect a JSON response containing NFT metadata fields (likely name, description, image, attributes), but the precise schema is unverified.","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","ERC-721 metadata","NFT attributes","on-chain metadata","x402 NFT endpoint","Base USDC API"],"warnings":["No OpenAPI or schema documentation found for this endpoint","No request body or response examples available","Endpoint /api/v1/nfts/77/metadata is not listed among the provider's advertised APIs on the landing page","Exact response format is unknown — NFT metadata structure is inferred, not confirmed","Only token ID 77 is referenced; unclear if other token IDs are supported at different paths"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/77/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/77/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and network, but there is no OpenAPI schema, no request/response examples, and no documentation for this specific NFT metadata endpoint. The endpoint path is not listed on the provider's own landing page among its advertised APIs, making its purpose and output schema 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'/request':16,32 '0.02':15,31,76,138 '000':80 '0x8335':67 '20':79 '2913':68 '6':84 '77':41 'Base USDC API' 'ERC-721 metadata' 'NFT attributes' 'NFT metadata API' 'accept':55,207 'access':170 'advertis':163 'ai/ml':127 'analyt':126 'api':87,123 'appear':153 'attribut':227 'base':5,21,52,70,81 'base-network' 'bodi':191 'broader':112 'call':9,25,78 'categori':151 'chain':158 'challeng':200 'commit':167 'confirm':201 'contain':219 'contract':66 'cost':74 'data':125,130 'decim':85 'descript':225 'detail':178 'document':179 'dozen':118 'endpoint':3,19,34,107,143,187,203 'exact':189 'exampl':176 'expect':215 'fall':147 'field':222 'finance/web3':129 'format':192 'found':181 'gate':122,210 'header':105 'id':40 'imag':226 'individu':98 'infer':128 'infrastructur':132 'instant':169 'json':60,217 'key':88 'like':223 'limit':90 'list':150 'live':205 'lowpaymentfee.com':115 'maximum':73 'metadata':2,18,37,160,186,221 'minimum':165 'name':224 'network':53 'nft':1,17,36,159,185,220 'nft-metadata' 'no-api-key' 'offer':117 'on-chain':156 'on-chain metadata' 'openapi':173 'outsid':148 'paid':99 'part':109 'pay':7,23,45 'pay-per-cal':6,22 'pay-per-request':44 'payment':61,104,209 'payment-g':208 'per':8,24,46,77,139 'platform':113,162 'post':56,211 'precis':230 'price':135 'probe':144 'protocol':49 'rate':89 'request':47,57,96,140,190,212 'request/response':175 'requir':94 'respons':194,218 'return':59 'schema':174,231 'serv':35,155 'settl':63 'span':124 'specif':142,184 'structur':195 'subscript':92 'token':39 'token metadata' 'uniform':136 'unit':82 'unknown':197 'unverifi':233 'usdc':13,29,65 'usdc-settlement' 'user':213 'util':133 'via':10,26,42,100 'x':103 'x-payment':102 'x402':11,27,48,121,199 'x402 NFT endpoint' 'x402-gated':120 'x402-payment'","prices":[{"id":"c1d229db-0159-488a-890a-b4cc26baae82","listingId":"e14fc7a6-da06-4aee-983a-04f64722d561","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/77/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":"2026-04-21T18:32:28.585Z"}],"sources":[{"listingId":"e14fc7a6-da06-4aee-983a-04f64722d561","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/77/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.585Z","lastSeenAt":"2026-04-22T13:32:33.854Z"}],"details":{"listingId":"e14fc7a6-da06-4aee-983a-04f64722d561","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/77/metadata \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/77/metadata"},{"claim":"The platform advertises $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","source_url":"https://lowpaymentfee.com/api/v1/nfts/77/metadata"}],"useCases":["Retrieving metadata for a specific NFT (token 77) programmatically","Integrating NFT display data into wallets or marketplaces","Agents fetching NFT attributes for on-chain analysis","Demonstrating x402 micropayment-gated API access"],"bestFor":["Developers needing pay-per-call NFT metadata without API key management","AI agents that can settle USDC payments on Base via x402","Quick one-off metadata lookups without subscription overhead"],"notFor":["Bulk retrieval of metadata across many NFT collections (only token 77 is confirmed)","Users who cannot settle USDC on Base network","Applications requiring free or subscription-based access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.422Z"},"updatedAt":"2026-04-22T13:32:33.854Z"}}