{"id":"776a7852-e36c-46a7-a709-b9a3cb265660","shortId":"sGGyBx","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 75 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 rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access the resource.\n\nThe provider operates a broader platform offering dozens of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion). All endpoints share the same $0.02/request pricing model and settle on the Base L2 network using USDC. The specific endpoint listed here returns application/json content and is discoverable via the x402 challenge.\n\nBecause this is a single NFT metadata endpoint (token ID 75), its utility is narrow compared to the platform's full catalog. No OpenAPI schema, request body format, or response examples are documented in the crawled material, so the exact fields expected in the POST body and the structure of the returned metadata are unknown. The platform landing page confirms the endpoint is live and part of a larger suite, but detailed documentation was not available at the crawled pages.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","json-response"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","NFT token info","x402 NFT endpoint","Base USDC API","pay-per-request NFT","lowpaymentfee API"],"warnings":["No OpenAPI or schema documentation available — request body format and response structure are unknown","Endpoint is scoped to a single NFT token ID (75); unclear if other token IDs are available at different paths","Documentation pages (/api, /pricing, /README) returned no meaningful content beyond 'Connect wallet'","The broader platform advertises many API categories but none were verified beyond the landing page listing"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/75/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/75/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 captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documented request body format, no response examples, and the endpoint serves metadata for a single hardcoded token ID. Documentation pages returned only 'Connect wallet' with no useful 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'0.02':15,31,57,73,143 '000':67 '20':66 '6':71 '75':43,181 'Base USDC API' 'NFT metadata API' 'NFT token info' 'access':97 'ai/ml':117 'analysi':120 'analyt':116 'api':75,113 'application/json':162 'attach':84 'avail':246 'base':5,21,62,68,151 'base-network' 'bodi':197,216 'broader':104 'call':9,25,55,112 'caller':82 'catalog':192 'challeng':170 'classif':122 'compar':186 'confirm':230 'content':163 'convers':137 'cost':56 'crawl':206,249 'data':115,125 'decim':72 'detail':242 'discover':166 'document':203,243 'dozen':107 'embed':123 'endpoint':3,19,34,139,158,178,232 'estim':131 'exact':210 'exampl':201 'exchang':128 'expect':212 'feed':127 'field':211 'finance/web3':124 'format':198 'full':191 'gas':130 'gate':48 'geocod':135 'header':89 'id':42,180 'infer':118 'infrastructur':133 'json-response' 'key':76 'l2':152 'land':228 'larger':239 'limit':79 'list':159 'live':234 'lowpaymentfee API' 'lowpaymentfee.com':36 'materi':207 'maxamountrequir':64 'metadata':2,18,39,177,223 'model':146 'narrow':185 'network':63,153 'nft':1,17,38,176 'nft-metadata' 'no-api-key' 'offer':106 'openapi':194 'oper':102 'page':229,250 'part':236 'pay':7,23,110 'pay-per-cal':6,22,109 'pay-per-call' 'pay-per-request NFT' 'payment':52,88,94 'per':8,24,111 'platform':105,189,227 'post':46,215 'price':126,145 'proof':95 'protocol':53 'provid':101 'rate':78,129 'request':47,196 'requir':81 'resourc':99 'respons':200 'return':161,222 'schema':195 'sentiment':119 'serv':37 'settl':148 'share':140 'simpli':83 'singl':175 'span':114 'specif':157 'structur':219 'suit':240 'summar':121 'token':41,179 'token metadata' 'unit':69 'unknown':225 'usdc':13,29,59,155 'usdc-settlement' 'use':154 'util':134,183 'valid':92,136 'via':10,26,44,167 'x':87 'x-payment':86 'x402':11,27,51,93,169 'x402 NFT endpoint' 'x402-payment'","prices":[{"id":"c5b6c01c-c97a-47d3-afef-ce63b2e3414f","listingId":"776a7852-e36c-46a7-a709-b9a3cb265660","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/75/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":"2026-04-21T18:32:32.751Z"}],"sources":[{"listingId":"776a7852-e36c-46a7-a709-b9a3cb265660","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/75/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.751Z","lastSeenAt":"2026-04-22T05:32:23.966Z"}],"details":{"listingId":"776a7852-e36c-46a7-a709-b9a3cb265660","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/75/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 advertising USDC on Base network at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/nfts/75/metadata"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/75/metadata"}],"useCases":["Retrieve on-chain NFT metadata for token ID 75 programmatically","Integrate NFT metadata into a dApp or marketplace without managing API keys","Demonstrate x402 micropayment-gated API access patterns"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing NFT metadata with no signup or key management","Low-volume, pay-as-you-go NFT data retrieval"],"notFor":["Bulk retrieval of metadata across many NFT collections (only serves token 75)","Users who need free or subscription-based NFT metadata APIs","Production systems requiring documented request/response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.474Z"},"updatedAt":"2026-04-22T05:32:23.966Z"}}