{"id":"72af281f-2ba4-47e9-b278-2567e49c5e5a","shortId":"jVdbcW","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 x402-enabled endpoint at lowpaymentfee.com serves NFT metadata for token ID 64 via a POST request. Payment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 exact payment scheme. The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals). No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe provider hosts a broader suite of pay-per-call APIs across categories including data/analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02-per-request pricing model on the Base network.\n\nDocumentation is minimal: there is no OpenAPI spec, no request/response schema beyond the x402 challenge's outputSchema stub, and the crawled /api, /pricing, and /README pages all resolve to a bare \"Connect wallet\" prompt. The specific structure of the NFT metadata response for token 64 is unknown. Callers should expect a JSON response (mimeType is application/json) but will need to discover the exact shape empirically.","tags":[],"capabilities":["x402-payment","nft-metadata","usdc-base","pay-per-call","no-api-key","no-rate-limit"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","x402 NFT endpoint","Base USDC API","pay-per-request NFT","lowpaymentfee","on-chain metadata"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","Crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content","Only token ID 64 is exposed at this specific path; generalizability to other token IDs is unclear","No SLA, uptime, or support information provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/64/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/64/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 spec, no request body schema, no example response, and the crawled docs pages are empty. The specific NFT metadata content is entirely unknown, making this effectively a stub 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'/pricing':187 '/readme':189 '/request':16,32 '0.02':15,31,84,155 '000':77 '0x8335':61 '20':76 '2913':62 '6':87 '64':46,209 'Base USDC API' 'NFT metadata API' 'across':123 'advertis':96 'ai/ml':127 'amount':71 'analysi':129 'api':90,122 'application/json':220 'attach':99 'bare':195 'base':5,21,56,78,163 'beyond':176 'broader':115 'call':9,25,74,121 'caller':97,212 'categori':124 'challeng':179 'classif':131 'connect':196 'contract':60 'convers':147 'crawl':185 'data/analytics':126 'decim':88 'discov':225 'document':165 'embed':132 'empir':229 'enabl':36 'endpoint':3,19,37,151 'equal':83 'estim':141 'exact':66,227 'exchang':136 'expect':214 'feed':135 'finance/web3':133 'gas':140 'generat':148 'geocod':145 'header':104 'host':113 'id':45 'includ':125 'infrastructur':143 'json':216 'key':91 'limit':94 'list':150 'lowpaymentfee' 'lowpaymentfee.com':39 'maximum':70 'metadata':2,18,42,205 'mimetyp':218 'minim':167 'model':160 'need':223 'network':57,164 'nft':1,17,41,204 'nft-metadata' 'no-api-key' 'no-rate-limit' 'on-chain metadata' 'openapi':171 'outputschema':181 'page':190 'pay':7,23,119 'pay-per-cal':6,22,118 'pay-per-call' 'pay-per-request NFT' 'payment':51,67,103,109 'per':8,24,73,120,157 'per-request':156 'post':49 'price':134,159 'prompt':198 'proof':110 'provid':112 'quot':139 'rate':93,137 'request':50,158 'request/response':174 'requir':72 'resolv':192 'respons':206,217 'schema':175 'scheme':68 'sentiment':128 'serv':40 'settl':53 'shape':228 'share':152 'simpli':98 'spec':172 'specif':200 'structur':201 'stub':182 'suit':116 'summar':130 'token':44,138,208 'token metadata' 'unit':79 'unknown':211 'usdc':13,29,59,81,85 'usdc-base' 'use':58,86 'util':144 'valid':107,146 'via':10,26,47 'wallet':197 'x':102 'x-payment':101 'x402':11,27,35,65,108,178 'x402 NFT endpoint' 'x402-enabled':34 'x402-payment'","prices":[{"id":"a148976d-85dd-4bee-9a83-8a7546001a82","listingId":"72af281f-2ba4-47e9-b278-2567e49c5e5a","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/64/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":"2026-04-21T18:32:32.832Z"}],"sources":[{"listingId":"72af281f-2ba4-47e9-b278-2567e49c5e5a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/64/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.832Z","lastSeenAt":"2026-04-22T05:32:24.061Z"}],"details":{"listingId":"72af281f-2ba4-47e9-b278-2567e49c5e5a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/64/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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/64/metadata"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/64/metadata"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching metadata for a specific NFT (token 64) programmatically","Integrating NFT metadata into a dApp or marketplace without managing API keys","Demonstrating x402 micropayment flows on the Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need on-demand NFT metadata without subscription overhead","Low-volume, pay-as-you-go NFT data retrieval"],"notFor":["Bulk NFT metadata ingestion across many collections (only token 64 is exposed at this path)","Users who need detailed API documentation or guaranteed SLAs","Non-crypto workflows that cannot settle USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.399Z"},"updatedAt":"2026-04-22T05:32:24.061Z"}}