{"id":"dea2e011-fae9-4a8d-b7bc-b7ec3eb5c0a7","shortId":"2V3yT6","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 returns NFT metadata for token ID 69 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; access is gated purely by the x402 payment header.\n\nThe provider's landing page lists a broad catalog of pay-per-call APIs spanning data/analytics, AI/ML (sentiment, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion). All endpoints are priced at $0.02 per request and settle on Base. However, this specific listing covers only the NFT metadata endpoint at /api/v1/nfts/69/metadata.\n\nDocumentation is minimal — no OpenAPI spec, no request/response schema, and no example payloads are provided. The endpoint is confirmed live (returns a proper 402 challenge), but the actual structure of the metadata response is unknown. Callers should expect a JSON response (mimeType is application/json) but will need to discover the exact schema experimentally.","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 info endpoint","x402 NFT","Base USDC API","pay-per-request NFT"],"warnings":["No OpenAPI or schema documentation available — request and response formats are undocumented.","Only token ID 69 is addressed by this specific endpoint path; it is unclear whether other token IDs are supported at different paths.","Landing page lists many API categories but crawled sub-pages (/api, /pricing, /README) returned no useful content beyond 'Connect wallet'."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/69/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/69/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing, but there is no OpenAPI spec, no request/response schema, no example payloads, and no documentation beyond the landing page listing. The actual content returned by this NFT metadata endpoint is entirely 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'/request':16,32 '0.02':15,31,85,147 '000':78 '0x8335':61 '20':77 '2913':62 '402':189 '6':88 '69':46 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'access':98 'actual':193 'advertis':97 'ai/ml':124 'amount':72 'api':91,121 'application/json':209 'base':5,21,56,79,153 'base-network' 'broad':114 'call':9,25,75,120 'caller':201 'catalog':115 'challeng':190 'classif':127 'confirm':184 'contract':60 'convers':141 'cover':158 'data/analytics':123 'decim':89 'discov':214 'document':166 'embed':128 'enabl':36 'endpoint':3,19,37,143,163,182 'equal':84 'estim':135 'exact':67,216 'exact-pay':66 'exampl':177 'exchang':132 'expect':203 'experiment':218 'feed':131 'finance/web3':129 'gas':134 'gate':100 'geocod':139 'header':106 'howev':154 'id':45 'infrastructur':137 'json':205 'key':92 'land':110 'limit':95 'list':112,157 'live':185 'lowpaymentfee.com':39 'maximum':71 'metadata':2,18,42,162,197 'mimetyp':207 'minim':168 'need':212 'network':57 'nft':1,17,41,161 'nft-metadata' 'no-api-key' 'openapi':170 'page':111 'pay':7,23,118 'pay-per-cal':6,22,117 'pay-per-call' 'pay-per-request NFT' 'payload':178 'payment':51,68,105 'per':8,24,74,119,148 'post':49 'price':130,145 'proper':188 'provid':108,180 'pure':101 'rate':94,133 'request':50,149 'request/response':173 'requir':73 'respons':198,206 'return':40,186 'schema':174,217 'scheme':69 'sentiment':125 'settl':53,151 'span':122 'spec':171 'specif':156 'structur':194 'summar':126 'token':44 'token metadata' 'unit':80 'unknown':200 'usdc':13,29,59,82,86 'usdc-settlement' 'use':58,87 'util':138 'valid':140 'via':10,26,47 'x402':11,27,35,65,104 'x402 NFT' 'x402-enabled':34 'x402-payment'","prices":[{"id":"7684d234-c6f2-41da-aac0-84143ce4309b","listingId":"dea2e011-fae9-4a8d-b7bc-b7ec3eb5c0a7","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/69/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":"2026-04-21T18:32:28.531Z"}],"sources":[{"listingId":"dea2e011-fae9-4a8d-b7bc-b7ec3eb5c0a7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/69/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.531Z","lastSeenAt":"2026-04-22T13:32:33.786Z"}],"details":{"listingId":"dea2e011-fae9-4a8d-b7bc-b7ec3eb5c0a7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/69/metadata \\\n  -H \"X-PAYMENT: <x402_payment_header>\" \\\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 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/69/metadata"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/nfts/69/metadata"},{"claim":"All listed APIs priced at $0.02/request with no API keys, no rate limits, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/69/metadata"}],"useCases":["Retrieve on-chain NFT metadata for token ID 69 without needing an API key","Integrate NFT metadata lookups into agent workflows with automatic micropayments","Demonstrate x402 payment protocol usage on the Base network"],"bestFor":["Developers experimenting with x402 pay-per-call protocols","Agents that need NFT metadata with no subscription or key management","Low-volume, on-demand NFT data retrieval"],"notFor":["Bulk NFT metadata retrieval across many token IDs (only token 69 is exposed at this path)","Users who need detailed documentation or guaranteed SLAs","Free-tier or non-crypto payment workflows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.547Z"},"updatedAt":"2026-04-22T13:32:33.786Z"}}