{"id":"0cc1cd13-ceb8-4fee-93d7-a6662f964f9d","shortId":"baa2sY","kind":"x402","title":"x402-gated NFT data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated NFT data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides premium API access to NFT data via the x402 payment protocol. The specific route `/api/v1/nfts/50` appears to serve NFT-related information (likely for token ID 50 or a similar resource identifier), gated behind a per-request USDC micropayment on the Base network.\n\nThe endpoint charges a maximum of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request. Payment is made via the x402 exact-payment scheme — no API keys, subscriptions, or rate limits are required. The caller simply includes an X-PAYMENT header with a valid payment proof, and the endpoint returns JSON.\n\nThe provider (lowpaymentfee.com) hosts a broader suite of x402-gated APIs spanning data/analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per call. However, this specific listing covers only the `/api/v1/nfts/50` route. No OpenAPI schema, request body specification, or example responses are documented, so the exact input parameters and output format remain unknown. The endpoint accepts POST requests based on the x402 challenge's outputSchema.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","nft-data","per-request-billing","no-api-key","json-response"],"categories":["web3","nft","data"],"synonyms":["NFT API","NFT data endpoint","x402 NFT","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Exact request body parameters and response format are unknown","The /api/v1/nfts/50 route is not listed on the provider's landing page among advertised APIs — it may be undocumented or experimental","Crawled docs/pricing/README pages returned no content beyond 'Connect wallet'"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/50","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/50","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 challenge with clear pricing. However, there is no OpenAPI schema, no documented request/response format, no examples, and the NFT-specific functionality of this route is only inferred from the URL path. The crawled site pages beyond the landing page returned only 'Connect wallet' with no useful 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'0.02':10,24,96,160 '000':85 '0x8335':90 '20':84 '2913':91 '50':60 'Base network API' 'NFT API' 'NFT data endpoint' 'USDC pay-per-call' 'accept':195 'access':36 'ai/ml':151 'api':35,110,148 'appear':49 'base':8,22,76,86,93,198 'base-network' 'behind':67 'bodi':176 'broader':142 'call':162 'caller':119 'challeng':202 'charg':80 'cover':167 'data':5,19,39 'data/analytics':150 'document':182 'endpoint':6,20,30,79,134,194 'equal':95 'exact':106,185 'exact-pay':105 'exampl':179 'finance/web3':153 'format':190 'gate':3,17,66,147 'header':126 'host':140 'howev':163 'id':59 'identifi':65 'includ':121 'infer':152 'inform':55 'infrastructur':155 'input':186 'json':136 'json-response' 'key':111 'like':56 'limit':115 'list':166 'lowpaymentfee' 'lowpaymentfee.com':32,139 'made':101 'maximum':82 'micropay':73 'micropayment API' 'network':77 'nft':4,18,38,53 'nft-data' 'nft-relat':52 'no-api-key' 'openapi':173 'output':189 'outputschema':204 'paramet':187 'pay':9,23 'payment':43,99,107,125,130 'per':11,25,70,97,161 'per-request':69 'per-request-billing' 'post':196 'premium':34 'price':158 'proof':131 'protocol':44 'provid':33,138 'rate':114 'relat':54 'remain':191 'request':12,26,71,98,175,197 'requir':117 'resourc':64 'respons':180 'return':135 'rout':47,171 'schema':174 'scheme':108 'serv':51 'similar':63 'simpli':120 'span':149 'specif':46,165,177 'subscript':112 'suit':143 'token':58 'unit':87 'unknown':192 'usdc':14,28,72,89 'usdc-micropayment' 'util':156 'valid':129 'via':40,102 'x':124 'x-payment':123 'x402':2,16,42,104,146,201 'x402 NFT' 'x402-gated':1,15,145 'x402-payment'","prices":[{"id":"0bfb776e-ced2-4684-bf8c-42d96f4eb180","listingId":"0cc1cd13-ceb8-4fee-93d7-a6662f964f9d","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/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.323Z"}],"sources":[{"listingId":"0cc1cd13-ceb8-4fee-93d7-a6662f964f9d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/50","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.323Z","lastSeenAt":"2026-04-22T02:32:09.634Z"}],"details":{"listingId":"0cc1cd13-ceb8-4fee-93d7-a6662f964f9d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/50 \\\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 HTTP 402 with x402 version 1 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/nfts/50"},{"claim":"Max amount required is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/nfts/50"},{"claim":"Provider advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Provider lists multiple API categories (Data & Analytics, AI & ML, Finance & Web3, Infrastructure) all at $0.02","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching NFT metadata or details for a specific token via a single micropayment","Integrating pay-per-call NFT data into an AI agent workflow without managing API keys","Programmatic access to NFT information settled on Base L2 in USDC"],"bestFor":["Developers wanting keyless, pay-per-use NFT data access","AI agents that can settle x402 micropayments on Base","Prototyping Web3 data integrations without subscription commitments"],"notFor":["High-volume NFT data consumers who need bulk/batch pricing","Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone needing non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.856Z"},"updatedAt":"2026-04-22T02:32:09.634Z"}}