{"id":"7743a11b-f96e-4b6c-a1d5-a697d3bbe2bd","shortId":"z8hXA4","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 5 via a POST request. Payment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 exact-payment scheme. The advertised maximum cost per call is 20,000 base units of USDC, which equals $0.02 (two cents) given USDC's 6-decimal precision.\n\nThe provider hosts a broader suite of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing model with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint listed here (/api/v1/nfts/5/metadata) returns application/json content. No OpenAPI schema, request body schema, or response examples are documented, so the exact fields returned in the NFT metadata payload are unknown. The x402 challenge was successfully captured (HTTP 402), confirming the endpoint is live and accepting payment-gated requests.","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 info endpoint","x402 NFT","pay-per-call NFT","Base USDC API","lowpaymentfee"],"warnings":["No OpenAPI or JSON schema available for request or response bodies","No documentation on what NFT metadata fields are returned","The endpoint is for a single hardcoded token ID (5); unclear if other IDs are supported","Provider landing page lists many API categories but no detailed docs were crawlable"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/5/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/5/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 details, but there is no OpenAPI spec, no documented request/response schema, and no example payloads for this NFT metadata endpoint. The endpoint's actual behavior and returned fields are entirely unknown, making this effectively a stub 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'/request':16,32,139 '0.02':15,31,85,138 '000':78 '0x8335':61 '20':77 '2913':62 '402':192 '5':46 '6':91 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'accept':199 'advertis':71 'ai/ml':109 'analysi':112 'analyt':108 'api':105,144 'application/json':160 'base':5,21,56,79 'base-network' 'bodi':166 'broader':98 'call':9,25,75 'captur':190 'cent':87 'challeng':187 'classif':114 'commit':152 'confirm':193 'content':161 'contract':60 'convers':131 'cost':73 'data':107 'decim':92 'document':172 'embed':115 'enabl':36 'endpoint':3,19,37,134,155,195 'equal':84 'estim':125 'exact':67,175 'exact-pay':66 'exampl':170 'exchang':120 'feed':119 'field':176 'financ':116 'gas':124 'gate':202 'generat':132 'geocod':129 'given':88 'host':96 'http':191 'id':45 'infer':110 'infrastructur':127 'key':145 'limit':148 'list':156 'live':197 'lowpaymentfee' 'lowpaymentfee.com':39 'maximum':72 'metadata':2,18,42,181 'minimum':151 'model':141 'network':57 'nft':1,17,41,180 'nft-metadata' 'no-api-key' 'openapi':163 'pay':7,23,102 'pay-per-cal':6,22 'pay-per-call NFT' 'pay-per-request':101 'payload':182 'payment':51,68,201 'payment-g':200 'per':8,24,74,103 'post':49 'precis':93 'price':118,140 'provid':95 'quot':123 'rate':121,147 'request':50,104,165,203 'respons':169 'return':159,177 'schema':164,167 'scheme':69 'sentiment':111 'serv':40 'settl':53 'share':135 'span':106 'specif':154 'success':189 'suit':99 'summar':113 'token':44,122 'token metadata' 'two':86 'unit':80 'unknown':184 'usdc':13,29,59,82,89 'usdc-settlement' 'use':58 'util':128 'valid':130 'via':10,26,47 'web3':117 'x402':11,27,35,65,186 'x402 NFT' 'x402-enabled':34 'x402-payment'","prices":[{"id":"678eb7b6-7227-4740-8c97-02051bd3307f","listingId":"7743a11b-f96e-4b6c-a1d5-a697d3bbe2bd","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/5/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":"2026-04-21T18:32:32.976Z"}],"sources":[{"listingId":"7743a11b-f96e-4b6c-a1d5-a697d3bbe2bd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/5/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.976Z","lastSeenAt":"2026-04-22T04:02:47.526Z"}],"details":{"listingId":"7743a11b-f96e-4b6c-a1d5-a697d3bbe2bd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/5/metadata \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns HTTP 402 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/5/metadata"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/5/metadata"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving on-chain NFT metadata without managing API keys","Agent-driven NFT data lookups with micropayment settlement","Integrating NFT metadata into wallets or dashboards via x402"],"bestFor":["Developers needing keyless, pay-per-call NFT metadata access","AI agents that can settle x402 payments on Base","Prototyping NFT-aware applications without subscription overhead"],"notFor":["Bulk retrieval of metadata across thousands of NFTs (no batch endpoint documented)","Users who need metadata for NFTs not hosted on this provider","Applications requiring free or subscription-based access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.049Z"},"updatedAt":"2026-04-22T04:02:47.526Z"}}