{"id":"fa3bdf11-46b4-4308-ab9d-928be39947e7","shortId":"myDfSW","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 72 via a POST request, gated behind 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 accounts are needed — callers attach an X-PAYMENT header with a valid x402 payment proof and receive JSON metadata in return.\n\nThe provider, lowpaymentfee.com, hosts a broader suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment, 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, settle in USDC on Base, and require no rate-limit management or subscription. However, this specific listing covers only the NFT metadata endpoint at /api/v1/nfts/72/metadata.\n\nThe endpoint is live and returns a proper 402 challenge with x402 version 1. No OpenAPI schema or detailed documentation was found beyond the landing page listing. The actual structure of the NFT metadata response is unknown — the outputSchema only specifies the HTTP method (POST) and discoverability flag. Callers should expect a JSON response but should verify the payload shape empirically.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","NFT token info","x402 NFT endpoint","Base USDC API","pay-per-request NFT","on-chain metadata"],"warnings":["No OpenAPI or detailed documentation available for this endpoint","Response schema for NFT metadata is unknown — outputSchema only specifies HTTP method","Only token ID 72 is referenced; unclear if other token IDs are supported at similar paths","The broader site lists many API categories but none have detailed docs beyond the landing page"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/72/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/72/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 and returns a valid x402 402 challenge, confirming it is operational. However, there is no OpenAPI schema, no documentation of request/response bodies, and the NFT metadata content is entirely unknown. The listing is effectively a stub with pricing and liveness confirmed but little 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'/request':16,32,142 '0.02':15,31,57,73,141 '000':67 '1':184 '20':66 '402':179 '6':71 '72':43 'Base USDC API' 'NFT metadata API' 'NFT token info' 'account':78 'actual':199 'ai/ml':116 'analyt':115 'api':75,112 'attach':82 'base':5,21,62,68,149 'base-network' 'behind':49 'beyond':193 'broader':105 'call':9,25,55,111 'caller':81,219 'challeng':180 'classif':120 'convers':135 'cost':56 'cover':163 'data':114,123 'decim':72 'detail':189 'discover':217 'document':190 'embed':121 'empir':231 'endpoint':3,19,34,137,168,172 'estim':129 'exchang':126 'expect':221 'feed':125 'finance/web3':122 'flag':218 'found':192 'gas':128 'gate':48 'geocod':133 'header':87 'host':103 'howev':159 'http':213 'id':42 'infer':117 'infrastructur':131 'json':96,223 'key':76 'land':195 'limit':155 'list':162,197 'live':174 'lowpaymentfee.com':36,102 'manag':156 'maxamountrequir':64 'metadata':2,18,39,97,167,204 'method':214 'model':144 'need':80 'network':63 'nft':1,17,38,166,203 'nft-metadata' 'no-api-key' 'on-chain metadata' 'openapi':186 'outputschema':209 'page':196 'pay':7,23,109 'pay-per-cal':6,22,108 'pay-per-call' 'pay-per-request NFT' 'payload':229 'payment':52,86,92 'per':8,24,110 'post':46,215 'price':124,143 'proof':93 'proper':178 'protocol':53 'provid':101 'rate':127,154 'rate-limit':153 'receiv':95 'request':47 'requir':151 'respons':205,224 'return':99,176 'schema':187 'sentiment':118 'serv':37 'settl':145 'shape':230 'share':138 'span':113 'specif':161 'specifi':211 'structur':200 'subscript':158 'suit':106 'summar':119 'token':41 'token metadata' 'unit':69 'unknown':207 'usdc':13,29,59,147 'usdc-settlement' 'util':132 'valid':90,134 'verifi':227 'version':183 'via':10,26,44 'x':85 'x-payment':84 'x402':11,27,51,91,182 'x402 NFT endpoint' 'x402-payment'","prices":[{"id":"529a0551-d5a1-48ef-ac81-e62fc48f0edc","listingId":"fa3bdf11-46b4-4308-ab9d-928be39947e7","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/72/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":"2026-04-21T18:32:32.651Z"}],"sources":[{"listingId":"fa3bdf11-46b4-4308-ab9d-928be39947e7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/72/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.651Z","lastSeenAt":"2026-04-22T07:02:17.547Z"}],"details":{"listingId":"fa3bdf11-46b4-4308-ab9d-928be39947e7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/72/metadata \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\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/72/metadata"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/nfts/72/metadata"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching metadata for NFT token #72 programmatically","Integrating NFT display data into wallets or marketplaces","Agent-driven NFT data retrieval with micropayments","Demonstrating x402 payment-gated API access"],"bestFor":["Developers needing on-demand NFT metadata without API key management","AI agents that can settle x402 payments on Base","Projects exploring micropayment-gated API patterns"],"notFor":["Bulk retrieval of metadata across many NFT collections (only token 72 is documented)","Users who cannot transact in USDC on the Base network","Applications requiring detailed OpenAPI documentation or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.623Z"},"updatedAt":"2026-04-22T07:02:17.547Z"}}