{"id":"838f2a2f-feb0-429f-8974-15f81c724bf4","shortId":"zVE7nh","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 `/api/v1/nfts/70` is part of the lowpaymentfee.com platform, a collection of x402 protocol pay-per-request APIs settled in USDC on the Base network. The specific endpoint appears to serve NFT-related data (resource ID 70) and is accessed via HTTP POST. Payment is handled inline via the x402 protocol — no API keys, accounts, or rate limits are required. Each request costs $0.02 (20,000 base units of USDC with 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises endpoints across several categories: data & analytics (metrics, reports, exports, insights), AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request. This particular NFT endpoint is not listed on the homepage catalog, so its exact response payload is unclear — the listing title is simply \"Premium API Access\" with no further documentation.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with scheme \"exact\" on the Base network, paying to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` in USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). No OpenAPI schema, request/response examples, or detailed documentation were found during crawling.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","nft-data","pay-per-request","no-api-key","http-post"],"categories":["web3","nft"],"synonyms":["NFT API","x402 NFT endpoint","pay-per-call NFT data","USDC micropayment API","Base network API","lowpaymentfee NFT","crypto-gated API"],"warnings":["No documentation or schema available for this specific endpoint (/api/v1/nfts/70)","Endpoint is not listed on the provider's own homepage API catalog — unclear if it is a production or test resource","No response examples or field definitions available; response payload is unknown","Provider's /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/70","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/70","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the NFT endpoint is not even listed on the provider's own homepage catalog. The actual data returned is entirely 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'0.02':10,24,95,152 '000':97 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':207 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':210 '20':96 '402':196 '6':103 '70':68 'Base network API' 'NFT API' 'USDC micropayment API' 'access':71,180 'account':86 'across':111 'address':206 'advertis':109 'ai':120 'analysi':124 'analyt':115 'api':48,84,179 'appear':59 'base':8,22,54,98,202 'base-network' 'broader':106 'catalog':165 'categori':113 'challeng':194 'classif':127 'collect':40 'convers':144 'cost':94 'crawl':222 'crypto-gated API' 'data':5,19,65,114 'decim':104 'detail':217 'document':184,218 'embed':128 'endpoint':6,20,30,58,110,147,158,186 'estim':138 'exact':168,199 'exampl':215 'exchang':133 'export':118 'feed':132 'financ':129 'found':220 'gas':137 'gate':3,17 'generat':145 'geocod':142 'handl':77 'homepag':164 'http':73,195 'http-post' 'id':67 'infrastructur':140 'inlin':78 'insight':119 'key':85 'learn':122 'limit':89 'list':161,174 'live':188 'lowpaymentfee NFT' 'lowpaymentfee.com':37,107 'machin':121 'metric':116 'network':55,203 'nft':4,18,63,157 'nft-data' 'nft-relat':62 'no-api-key' 'openapi':212 'part':34 'particular':156 'pay':9,23,45,204 'pay-per-call NFT data' 'pay-per-request':44 'payload':170 'payment':75 'per':11,25,46,153 'platform':38,108 'post':74 'premium':178 'price':131,150 'protocol':43,82 'quot':136 'rate':88,134 'relat':64 'report':117 'request':12,26,47,93,154 'request/response':214 'requir':91 'resourc':66 'respons':169 'return':190 'schema':213 'scheme':198 'sentiment':123 'serv':61 'settl':49 'sever':112 'simpli':177 'specif':57 'summar':126 'text':125 'titl':175 'token':135 'unclear':172 'uniform':149 'unit':99 'usdc':14,28,51,101,209 'usdc-settlement' 'util':141 'valid':143,192 'via':72,79 'web3':130 'x402':2,16,42,81,193 'x402 NFT endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"ee6bfa46-adc3-4957-9950-bb50e5792009","listingId":"838f2a2f-feb0-429f-8974-15f81c724bf4","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/70","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.574Z"}],"sources":[{"listingId":"838f2a2f-feb0-429f-8974-15f81c724bf4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/70","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.574Z","lastSeenAt":"2026-04-22T13:32:33.835Z"}],"details":{"listingId":"838f2a2f-feb0-429f-8974-15f81c724bf4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/70 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/70"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/70"}],"useCases":["Fetching NFT metadata or details on a per-request payment basis","Integrating NFT data into agent workflows without managing API keys","Programmatic access to NFT information settled via USDC on Base"],"bestFor":["Agents or bots that need keyless, on-demand NFT data access","Developers experimenting with x402 protocol micropayments","Low-volume or sporadic NFT data lookups where subscription pricing is wasteful"],"notFor":["High-volume NFT data ingestion where per-request costs add up quickly","Users who need well-documented, schema-validated NFT APIs with guaranteed response formats","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.517Z"},"updatedAt":"2026-04-22T13:32:33.835Z"}}