{"id":"a6ecafa4-c6ca-40e0-9268-c689e4d0c08b","shortId":"rMKTqm","kind":"x402","title":"x402 pay-per-call API platform on Base with $0.02 USDC requests — no keys, no rate limits.","tagline":"x402 pay-per-call API platform on Base with $0.02 USDC requests — no keys, no rate limits.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-call endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every request costs $0.02 in USDC on the Base network, settled via the x402 exact-payment scheme. There are no API keys, no rate limits, and no sign-up required — callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe specific endpoint at `/api/v1/nfts/83` is listed as \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 (USDC uses 6 decimals). The endpoint accepts POST requests and returns application/json. Beyond the generic \"Premium API Access\" label, no further documentation describes what data this particular NFT-related endpoint returns.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 per-request price point. However, no OpenAPI schema, request/response examples, or detailed documentation were found for any endpoint, including this one.","tags":[],"capabilities":["x402-payment","pay-per-call","usdc-base","no-api-key","no-rate-limit","nft-data","json-response"],"categories":["web3","data"],"synonyms":["NFT API","pay-per-request API","x402 endpoint","USDC micropayment API","Base network API","lowpaymentfee","crypto payment API"],"warnings":["No documentation found for /api/v1/nfts/83 — the endpoint's purpose and response format are unknown.","No OpenAPI spec, request schema, or response examples are available for any endpoint on the platform.","The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content.","The 'Premium API Access' description is generic and does not clarify what data is served."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/83","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/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and no documentation explaining what /api/v1/nfts/83 actually returns. The listing is effectively a stub with only the x402 challenge and a generic homepage to go 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'0.02':11,29,69,140,202 '000':130 '0x8335':135 '20':129 '6':143 'Base network API' 'NFT API' 'USDC micropayment API' 'accept':147 'access':121,158 'advertis':125,176 'ai/ml':59 'analysi':180 'analyt':58 'api':6,24,43,87,120,157 'application/json':152 'attach':100 'base':9,27,74,131,137 'beyond':153 'broad':48 'broader':174 'call':5,23,54 'caller':98 'catalog':49 'challeng':124 'classif':183 'convers':195 'cost':68 'crypto payment API' 'data':57,62,165 'decim':144 'describ':163 'detail':215 'document':162,216 'embed':184 'enabl':42 'endpoint':55,113,146,171,177,221 'equal':139 'estim':192 'everi':66 'exact':81 'exact-pay':80 'exampl':213 'exchang':187 'feed':186 'finance/web3':61 'found':218 'gas':191 'generat':197 'generic':155 'geocod':193 'header':105 'howev':208 'includ':222 'infer':60 'infrastructur':64 'json-response' 'key':15,33,88 'label':159 'limit':18,36,91 'list':117 'lowpaymentfee' 'lowpaymentfee.com':37 'maxamountrequir':127 'network':75 'nft':169 'nft-data' 'nft-relat':168 'no-api-key' 'no-rate-limit' 'offer':46 'one':224 'openapi':210 'particular':167 'pay':3,21,52 'pay-per-cal':2,20,51 'pay-per-call' 'pay-per-request API' 'payment':82,104,109 'per':4,22,53,204 'per-request':203 'platform':7,25,44,175 'point':207 'post':148 'premium':119,156 'price':185,206 'proof':110 'quot':190 'rate':17,35,90,188 'relat':170 'request':13,31,67,149,205 'request/response':212 'requir':97 'return':151,172 'schema':211 'scheme':83 'sentiment':179 'settl':76 'sign':95 'sign-up':94 'simpli':99 'span':56 'specif':112 'summar':182 'text':181 'token':189 'unit':132 'usdc':12,30,71,134,141 'usdc-base' 'use':142 'util':65 'valid':108,194 'via':77 'x':103 'x-payment':102 'x402':1,19,41,79,123 'x402 endpoint' 'x402-enabled':40 'x402-payment'","prices":[{"id":"88cd3e89-e7f0-48be-8319-f9fd6739943f","listingId":"a6ecafa4-c6ca-40e0-9268-c689e4d0c08b","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/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.480Z"}],"sources":[{"listingId":"a6ecafa4-c6ca-40e0-9268-c689e4d0c08b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/83","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.480Z","lastSeenAt":"2026-04-22T04:02:46.969Z"}],"details":{"listingId":"a6ecafa4-c6ca-40e0-9268-c689e4d0c08b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/83 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/83"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/83"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching NFT-related data without needing an API key or account","Programmatic access to premium data via automated USDC micropayments on Base","Agent-driven workflows that need frictionless, keyless API access"],"bestFor":["Developers or agents with USDC on Base who want instant, keyless API access","Micropayment-native workflows where per-call billing is preferred over subscriptions","Exploring x402 protocol integrations in agent-to-agent commerce"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Anyone without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.96Z"},"updatedAt":"2026-04-22T04:02:46.969Z"}}