{"id":"b0a181f5-201a-411c-82c4-eacd8bd8aaa7","shortId":"5brZpu","kind":"x402","title":"Pay-per-call MKR token data endpoint on Base via x402, $0.02/request in USDC.","tagline":"Pay-per-call MKR token data endpoint on Base via x402, $0.02/request in USDC.","description":"This x402-enabled endpoint at `/api/v1/tokens/MKR` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Each call costs $0.02 in USDC on the Base network, settled via the x402 exact-payment scheme with no API keys, no rate limits, and no subscriptions required.\n\nThe specific `/api/v1/tokens/MKR` endpoint appears to return token-related data for MKR (Maker). Based on the site's broader Finance & Web3 category (which includes price feeds, exchange rates, token quotes, and gas estimates), this endpoint likely returns market or reference data for the MKR token. However, no detailed documentation, request/response schema, or example payloads are available from the crawled material — the docs, API, pricing, and README pages all resolve to a minimal \"Connect wallet\" stub.\n\nPayment is made via the x402 protocol: callers attach an `X-PAYMENT` header with a signed USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals) to the address `0x1A2B…85F3` on Base. The endpoint accepts POST requests and returns `application/json`. The payment timeout is 300 seconds.","tags":[],"capabilities":["token-data","mkr","pay-per-request","x402-exact","usdc-base","no-api-key","json-response"],"categories":["finance","crypto"],"synonyms":["MKR token price","Maker token data","crypto token API","MKR market data","x402 token endpoint","pay-per-call crypto API"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no content.","No request or response schema provided; the exact data returned for MKR is unknown.","The /api/v1/tokens/MKR path is not listed on the site's landing page among the advertised endpoints, so it may be undocumented or experimental.","No OpenAPI spec or ai-plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/tokens/MKR","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/tokens/MKR","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, no examples, and the docs pages are empty stubs. The actual data returned by this endpoint is unknown beyond inference from the URL path and site 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'/request':14,30 '0.02':13,29,68,197 '000':193 '0x1a2b':206 '20':192 '300':222 '6':201 '85f3':207 'MKR market data' 'MKR token price' 'Maker token data' 'accept':212 'address':205 'ai/ml':59 'analyt':58 'api':55,85,157 'appear':98 'application/json':217 'attach':178 'avail':150 'base':10,26,73,108,194,209 'broader':113 'call':4,20,66 'caller':177 'categori':116 'collect':49 'connect':167 'cost':67 'crawl':153 'crypto token API' 'data':7,23,57,104,135 'decim':202 'detail':142 'doc':156 'document':143 'enabl':36 'endpoint':8,24,37,97,129,211 'estim':127 'exact':80 'exact-pay':79 'exampl':147 'exchang':121 'feed':120 'financ':114 'finance/web3':61 'gas':126 'header':183 'howev':140 'i.e':196 'includ':118 'infer':60 'infrastructur':63 'json-response' 'key':86 'like':130 'limit':89 'lowpaymentfee.com':44 'made':172 'maker':107 'market':132 'materi':154 'minim':166 'mkr':5,21,106,138 'network':74 'no-api-key' 'offer':47 'page':161 'part':41 'pay':2,18,52 'pay-per-cal':1,17 'pay-per-call crypto API' 'pay-per-request':51 'payload':148 'payment':81,170,182,188,219 'per':3,19,53 'platform':45 'post':213 'price':119,158 'protocol':176 'quot':124 'rate':88,122 'readm':160 'refer':134 'relat':103 'request':54,214 'request/response':144 'requir':93 'resolv':163 'return':100,131,216 'schema':145 'scheme':82 'second':223 'settl':75 'sign':186 'sinc':198 'site':111 'span':56 'specif':95 'stub':169 'subscript':92 'timeout':220 'token':6,22,102,123,139 'token-data' 'token-rel':101 'unit':195 'usdc':16,32,70,187,199 'usdc-base' 'use':200 'util':64 'via':11,27,76,173 'wallet':168 'web3':115 'x':181 'x-payment':180 'x402':12,28,35,78,175 'x402 token endpoint' 'x402-enabled':34 'x402-exact'","prices":[{"id":"f13c5a52-83ce-4818-8746-b26d4f94c0b8","listingId":"b0a181f5-201a-411c-82c4-eacd8bd8aaa7","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/tokens/MKR","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:39:09.943Z"}],"sources":[{"listingId":"b0a181f5-201a-411c-82c4-eacd8bd8aaa7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/tokens/MKR","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:09.943Z","lastSeenAt":"2026-04-24T03:02:52.567Z"}],"details":{"listingId":"b0a181f5-201a-411c-82c4-eacd8bd8aaa7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/tokens/MKR \\\n  -H \"X-PAYMENT: <x402-signed-payment>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Base","source_url":"https://lowpaymentfee.com/api/v1/tokens/MKR"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/tokens/MKR"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The Finance & Web3 category includes price feeds, exchange rates, token quotes, and gas estimates","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching current MKR token data or price information without an API key","Integrating MKR market data into an agent workflow with micropayments","Building dashboards that pull token data on-demand with per-request billing"],"bestFor":["Agents or bots that need on-demand MKR token data without subscription overhead","Developers who prefer crypto-native pay-per-call billing on Base","Low-volume or sporadic queries where $0.02/request is cost-effective"],"notFor":["High-frequency trading requiring sub-second latency and bulk pricing","Users who need comprehensive historical MKR data or OHLCV candles (no evidence this is supported)","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:39.665Z"},"updatedAt":"2026-04-24T03:02:52.567Z"}}