{"id":"ca4df483-5e49-4905-af28-9fea95b6737b","shortId":"nvRjR3","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 serves NFT metadata for token ID 74 at lowpaymentfee.com. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 \"exact\" 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 granted per-request upon valid x402 payment.\n\nThe provider, lowpaymentfee.com, hosts a broader catalog of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all listed at the same $0.02/request price point. However, this specific endpoint is scoped to NFT metadata retrieval.\n\nDocumentation is minimal. There is no OpenAPI spec, no request/response schema beyond the x402 challenge's outputSchema stub, and no example payloads. The endpoint is confirmed live (HTTP 402 challenge returned successfully), but the actual structure of the metadata response and any required POST body fields are unknown from the available material.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-request","json-response"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","NFT info endpoint","x402 NFT","Base USDC API","pay-per-call NFT","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","Only token ID 74 is referenced; unclear whether other token IDs are supported at similar paths","Landing page lists many API categories but no detailed docs were retrievable (pages returned only 'Connect wallet')","No examples of successful responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/74/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/74/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 (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request body schema, no response schema, and no documentation beyond the landing page listing. The actual content returned by this NFT metadata endpoint is entirely 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'0.02':15,31,86,150 '000':79 '0x8335':64 '20':78 '2913':65 '402':192 '6':89 '74':44 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'accept':48 'access':99 'actual':198 'advertis':98 'ai/ml':125 'amount':73 'analyt':124 'api':92,121 'avail':214 'base':5,21,59,80 'base-network' 'beyond':175 'bodi':208 'broader':114 'call':9,25,76,120 'catalog':115 'challeng':178,193 'classif':129 'confirm':189 'contract':63 'convers':143 'data':123 'decim':90 'document':164 'embed':130 'enabl':36 'endpoint':3,19,37,157,187 'equal':85 'estim':137 'exact':69 'exampl':184 'exchang':134 'feed':133 'field':209 'finance/web3':131 'gas':136 'generat':144 'geocod':141 'grant':101 'host':112 'howev':154 'http':191 'id':43 'infer':126 'infrastructur':139 'json':53 'json-response' 'key':93 'limit':96 'list':146 'live':190 'lowpaymentfee' 'lowpaymentfee.com':46,111 'materi':215 'maximum':72 'metadata':2,18,40,162,202 'minim':166 'network':60 'nft':1,17,39,161 'nft-metadata' 'openapi':170 'outputschema':180 'pay':7,23,118 'pay-per-cal':6,22,117 'pay-per-call NFT' 'pay-per-request' 'payload':185 'payment':54,108 'per':8,24,75,103,119 'per-request':102 'point':153 'post':49,207 'price':132,152 'provid':110 'rate':95,135 'request':50,104 'request/response':173 'requir':74,206 'respons':203 'retriev':163 'return':52,194 'schema':174 'scheme':70 'scope':159 'sentiment':127 'serv':38 'settl':56 'span':122 'spec':171 'specif':156 'structur':199 'stub':181 'success':195 'summar':128 'token':42 'token metadata' 'unit':81 'unknown':211 'upon':105 'usdc':13,29,62,83,87 'usdc-settlement' 'use':61,88 'util':140 'valid':106,142 'via':10,26 'x402':11,27,35,68,107,177 'x402 NFT' 'x402-enabled':34 'x402-payment'","prices":[{"id":"7a8a749f-4310-4526-a00f-af3021e39202","listingId":"ca4df483-5e49-4905-af28-9fea95b6737b","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/74/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":"2026-04-21T18:32:28.566Z"}],"sources":[{"listingId":"ca4df483-5e49-4905-af28-9fea95b6737b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/74/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.566Z","lastSeenAt":"2026-04-22T13:32:33.821Z"}],"details":{"listingId":"ca4df483-5e49-4905-af28-9fea95b6737b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/74/metadata \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/nfts/74/metadata"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/74/metadata"},{"claim":"All APIs listed at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieve on-chain NFT metadata for token ID 74 programmatically","Integrate NFT metadata lookups into agent workflows with micropayments","Demonstrate x402 payment protocol usage on Base"],"bestFor":["Developers experimenting with x402 pay-per-call protocols","Agents needing NFT metadata without API key provisioning","Low-volume, on-demand NFT data retrieval"],"notFor":["Bulk NFT metadata scraping across many collections","Use cases requiring detailed documentation or guaranteed SLAs","Users who need metadata for arbitrary token IDs (only token 74 is confirmed)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.545Z"},"updatedAt":"2026-04-22T13:32:33.821Z"}}