{"id":"50c2bca9-3b3c-4ed9-b3dd-d6fc8ae15aed","shortId":"YaJMK4","kind":"x402","title":"Buy KALE tokens with a custom USDC amount via x402 payment on Base","tagline":"Buy KALE tokens with a custom USDC amount via x402 payment on Base","description":"This x402-enabled endpoint at kale.x420.dev allows callers to purchase KALE tokens (contract 0x933C483A5d0Ac4234F4FA26b9950864Ca57afb07) by specifying a custom USDC amount. KALE is a token created via Clanker on the Base network. The action is referred to as a \"Puff\" — you enter a USDC amount and the endpoint handles the token swap.\n\nThe endpoint is part of the x420.dev platform, which hosts x402-compatible token purchase endpoints. According to the landing page, the service has processed 11 total transactions across 3 unique users with a 100% success rate and an average latency of 2.69 seconds. The trust score is listed at 85%. No formal API documentation, OpenAPI schema, or pricing page exists; the /docs, /api, /pricing, and /README paths all return placeholder pages. The x402 probe returned a 405 status rather than the expected 402 challenge, so the payment negotiation flow could not be verified at probe time.\n\nBecause there is no published schema or documentation beyond the landing page UI, the exact request format, accepted parameters, and response structure are unknown. Agents intending to use this endpoint will need to rely on x402 protocol conventions and may need to discover parameters experimentally.","tags":[],"capabilities":["token-swap","usdc-payment","x402-protocol","base-network","clanker-token"],"categories":["crypto","defi"],"synonyms":["KALE token","puff KALE","buy KALE USDC","x402 token swap","x420 puff","Clanker KALE","Base token purchase","KALE Kaleidoscope"],"warnings":["x402 probe returned 405 instead of expected 402 — payment flow could not be verified","No API documentation exists; /docs, /api, /pricing, /README all return placeholder pages","Request and response schemas are completely unknown and inferred","Very low transaction volume (11 total, 3 unique users) — liquidity and reliability unverified","Token is a Clanker-launched meme token — high financial risk"],"endpointUrl":"https://kale.x420.dev/api/puff-custom","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x93109d14F6665a9c9675290D3cD5A6c07bBAfdbd","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://kale.x420.dev/api/puff-custom","description":"Buy custom USDC amount worth of KALE tokens 0x933C483A5d0Ac4234F4FA26b9950864Ca57afb07","outputSchema":{"input":{"type":"http","method":"POST","bodyType":"json","bodyFields":{"amount":{"type":"string","required":false,"description":"Optional amount in USDC (e.g., '10', '10.5', '0.5'). Defaults to 5 if not provided."}}},"output":{"message":"string","tokensReceived":"string","usdcAmountPaid":"string","sendTransactionHash":"string | null","swapTransactionHash":"string | null"}},"maxAmountRequired":"5000000","maxTimeoutSeconds":120}]},"qualityScore":"0.200","qualityRationale":"No API documentation, no OpenAPI schema, no x402 challenge returned during probing (405 instead of 402), and /docs returns a placeholder. The only information comes from the landing page UI. Request/response formats are entirely 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'/docs':141 '/pricing':143 '/readme':145 '0x933c483a5d0ac4234f4fa26b9950864ca57afb07':41 '100':113 '11':104 '2.69':121 '3':108 '402':162 '405':156 '85':129 'Base token purchase' 'Clanker KALE' 'KALE Kaleidoscope' 'KALE token' 'accept':193 'accord':95 'across':107 'action':60 'agent':200 'allow':34 'amount':8,21,47,71 'api':132 'averag':118 'base':13,26,57 'base-network' 'beyond':184 'buy':1,14 'buy KALE USDC' 'caller':35 'challeng':163 'clanker':54 'clanker-token' 'compat':91 'contract':40 'convent':213 'could':169 'creat':52 'custom':6,19,45 'discov':218 'document':133,183 'enabl':30 'endpoint':31,74,80,94,205 'enter':68 'exact':190 'exist':139 'expect':161 'experiment':220 'flow':168 'formal':131 'format':192 'handl':75 'host':88 'intend':201 'kale':2,15,38,48 'kale.x420.dev':33 'land':98,186 'latenc':119 'list':127 'may':215 'need':207,216 'negoti':167 'network':58 'openapi':134 'page':99,138,150,187 'paramet':194,219 'part':82 'path':146 'payment':11,24,166 'placehold':149 'platform':86 'price':137 'probe':153,174 'process':103 'protocol':212 'publish':180 'puff':66 'puff KALE' 'purchas':37,93 'rate':115 'rather':158 'refer':62 'reli':209 'request':191 'respons':196 'return':148,154 'schema':135,181 'score':125 'second':122 'servic':101 'specifi':43 'status':157 'structur':197 'success':114 'swap':78 'time':175 'token':3,16,39,51,77,92 'token-swap' 'total':105 'transact':106 'trust':124 'ui':188 'uniqu':109 'unknown':199 'usdc':7,20,46,70 'usdc-payment' 'use':203 'user':110 'verifi':172 'via':9,22,53 'x402':10,23,29,90,152,211 'x402 token swap' 'x402-compatible':89 'x402-enabled':28 'x402-protocol' 'x420 puff' 'x420.dev':85","prices":[{"id":"b64c6d7b-3ff0-470e-a020-234bf76edee5","listingId":"50c2bca9-3b3c-4ed9-b3dd-d6fc8ae15aed","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"5000000","chain":"base","payTo":"0x93109d14F6665a9c9675290D3cD5A6c07bBAfdbd","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x93109d14F6665a9c9675290D3cD5A6c07bBAfdbd","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://kale.x420.dev/api/puff-custom","description":"Buy custom USDC amount worth of KALE tokens 0x933C483A5d0Ac4234F4FA26b9950864Ca57afb07","outputSchema":{"input":{"type":"http","method":"POST","bodyType":"json","bodyFields":{"amount":{"type":"string","required":false,"description":"Optional amount in USDC (e.g., '10', '10.5', '0.5'). Defaults to 5 if not provided."}}},"output":{"message":"string","tokensReceived":"string","usdcAmountPaid":"string","sendTransactionHash":"string | null","swapTransactionHash":"string | null"}},"maxAmountRequired":"5000000","maxTimeoutSeconds":120}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":120},"createdAt":"2026-04-18T06:06:27.388Z"}],"sources":[{"listingId":"50c2bca9-3b3c-4ed9-b3dd-d6fc8ae15aed","source":"x402_bazaar","sourceId":"https://kale.x420.dev/api/puff-custom","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T06:06:27.388Z","lastSeenAt":"2026-04-23T05:00:32.802Z"}],"details":{"listingId":"50c2bca9-3b3c-4ed9-b3dd-d6fc8ae15aed","quickStartSnippet":"# x402 endpoints require payment headers; exact schema is undocumented.\n# Conceptual call:\ncurl -X POST https://kale.x420.dev/api/puff-custom \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"amount\": \"1.00\"}'","exampleRequest":{"amount":"1.00"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"POST","bodyType":"json","bodyFields":{"amount":{"type":"string","required":false,"description":"Optional amount in USDC (e.g., '10', '10.5', '0.5'). Defaults to 5 if not provided."}}},"output":{"message":"string","tokensReceived":"string","usdcAmountPaid":"string","sendTransactionHash":"string | null","swapTransactionHash":"string | null"}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"KALE token contract is 0x933C483A5d0Ac4234F4FA26b9950864Ca57afb07, created via Clanker","source_url":"https://kale.x420.dev"},{"claim":"11 total transactions, 3 unique users, 100% success rate, 2.69s avg latency, 85% trust score","source_url":"https://kale.x420.dev"},{"claim":"x402 probe returned 405 status instead of 402","source_url":"https://kale.x420.dev/api/puff-custom"},{"claim":"/docs, /api, /pricing, /README all return placeholder 'doesn't exist' pages","source_url":"https://kale.x420.dev/docs"}],"useCases":["Programmatically purchasing KALE tokens with USDC via an x402 payment flow","Agents acquiring meme/community tokens on Base without manual wallet interaction","Automated portfolio diversification into Clanker-launched tokens"],"bestFor":["AI agents that need to swap USDC for KALE tokens on Base","Developers experimenting with x402 payment-gated token purchases","Users who want a simple HTTP-based token buy without direct DEX interaction"],"notFor":["High-volume or institutional trading requiring deep liquidity and order books","Users needing detailed API documentation or SLA guarantees","Non-crypto use cases or fiat-only workflows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:45.919Z"},"updatedAt":"2026-04-23T05:00:32.802Z"}}