{"id":"0566e91b-08cb-418e-bb03-097ed6fefc5b","shortId":"QUBcVp","kind":"x402","title":"Buy custom USDC amounts of $df token (0x3077c5) on Base via x402 payment","tagline":"Buy custom USDC amounts of $df token (0x3077c5) on Base via x402 payment","description":"This x402 endpoint allows agents and users to purchase a custom USDC amount worth of $df tokens (contract 0x3077c5e15F8BD67F05f73b4dC49a507543FF0b07) on the Base network. The token was created via Clanker and is hosted on the x420.dev platform, which provides x402-enabled subdomains for token interactions.\n\nThe endpoint accepts a POST request with an optional `amount` field specifying the USDC value to spend (e.g., '10', '0.5'). If no amount is provided, it defaults to 5 USDC. The maximum payment accepted per call is 5 USDC (maxAmountRequired: 5000000 in 6-decimal USDC units). Payment is made via the x402 protocol using USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, sent to address 0x93109d14F6665a9c9675290D3cD5A6c07bBAfdbd. The response includes a swap transaction hash, a send transaction hash, the number of tokens received, and the USDC amount paid.\n\nThe token's x402 stats show minimal activity: 1 total transaction, 1 unique user, 100% success rate, average latency of 2.26s, and a trust score of 82%. No dedicated documentation, pricing page, or OpenAPI spec exists beyond the landing page and the x402 challenge itself.","tags":[],"capabilities":["token-swap","x402-payment","base-network","usdc-payment","custom-amount","erc20-purchase"],"categories":["defi","crypto"],"synonyms":["buy df token","swap USDC for df","x420 token purchase","clanker token swap","base chain token buy","x402 token swap","df token puff"],"warnings":["No dedicated API documentation exists — /docs, /api, /pricing, /README all return 'doesn't exist' pages","Extremely low usage: only 1 total transaction and 1 unique user reported on the landing page","Max payment per call is 5 USDC (5000000 in 6-decimal units), limiting transaction size","Response example is inferred from outputSchema, not from an actual observed response","This involves purchasing a speculative token with no apparent utility disclosure"],"endpointUrl":"https://df.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://df.x420.dev/api/puff-custom","description":"Buy custom USDC amount worth of df tokens 0x3077c5e15F8BD67F05f73b4dC49a507543FF0b07","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":"0.450","qualityRationale":"The x402 challenge is live and includes a well-defined outputSchema with input/output fields, but there is no OpenAPI spec, no documentation page, and the token has only 1 total transaction. The response example is inferred from the outputSchema rather than observed. Very low usage and no docs beyond the landing page limit 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'0x3077c5':8,21 '0x3077c5e15f8bd67f05f73b4dc49a507543ff0b07':45 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':127 '0x93109d14f6665a9c9675290d3cd5a6c07bbafdbd':133 '1':163,166 '10':90 '100':169 '2.26':175 '5':100,109 '5000000':112 '6':114 '82':182 'accept':74,105 'activ':162 'address':132 'agent':31 'allow':30 'amount':4,17,39,81,94,153 'averag':172 'base':10,23,48,129 'base chain token buy' 'base-network' 'beyond':192 'buy':1,14 'buy df token' 'call':107 'challeng':199 'clanker':55 'clanker token swap' 'contract':44 'creat':53 'custom':2,15,37 'custom-amount' 'decim':115 'dedic':184 'default':98 'df':6,19,42 'df token puff' 'document':185 'e.g':89 'enabl':67 'endpoint':29,73 'erc20-purchase' 'exist':191 'field':82 'hash':140,144 'host':58 'includ':136 'interact':71 'land':194 'latenc':173 'made':120 'maxamountrequir':111 'maximum':103 'minim':161 'network':49 'number':146 'openapi':189 'option':80 'page':187,195 'paid':154 'payment':13,26,104,118 'per':106 'platform':62 'post':76 'price':186 'protocol':124 'provid':64,96 'purchas':35 'rate':171 'receiv':149 'request':77 'respons':135 'score':180 'send':142 'sent':130 'show':160 'spec':190 'specifi':83 'spend':88 'stat':159 'subdomain':68 'success':170 'swap':138 'swap USDC for df' 'token':7,20,43,51,70,148,156 'token-swap' 'total':164 'transact':139,143,165 'trust':179 'uniqu':167 'unit':117 'usdc':3,16,38,85,101,110,116,126,152 'usdc-payment' 'use':125 'user':33,168 'valu':86 'via':11,24,54,121 'worth':40 'x402':12,25,28,66,123,158,198 'x402 token swap' 'x402-enabled':65 'x402-payment' 'x420 token purchase' 'x420.dev':61","prices":[{"id":"81cb9a8a-72ab-49eb-a9f9-1908bab40240","listingId":"0566e91b-08cb-418e-bb03-097ed6fefc5b","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://df.x420.dev/api/puff-custom","description":"Buy custom USDC amount worth of df tokens 0x3077c5e15F8BD67F05f73b4dC49a507543FF0b07","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":"2026-04-18T18:31:23.931Z"}],"sources":[{"listingId":"0566e91b-08cb-418e-bb03-097ed6fefc5b","source":"x402_bazaar","sourceId":"https://df.x420.dev/api/puff-custom","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:23.931Z","lastSeenAt":"2026-04-23T02:00:16.040Z"}],"details":{"listingId":"0566e91b-08cb-418e-bb03-097ed6fefc5b","quickStartSnippet":"curl -X POST https://df.x420.dev/api/puff-custom \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_header>\" \\\n  -d '{\"amount\": \"2.5\"}'","exampleRequest":{"amount":"2.5"},"exampleResponse":{"message":"Successfully swapped USDC for df tokens","tokensReceived":"1250000000000000000000","usdcAmountPaid":"2.5","sendTransactionHash":"0x789ghi...jkl012","swapTransactionHash":"0xabc123...def456"},"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":"The x402 challenge is live with maxAmountRequired of 5000000 (5 USDC) on Base network","source_url":"https://df.x420.dev/api/puff-custom"},{"claim":"Token contract is 0x3077c5e15F8BD67F05f73b4dC49a507543FF0b07, created via Clanker","source_url":"https://df.x420.dev"},{"claim":"x402 stats show 1 total transaction, 1 unique user, 100% success rate, 2.26s avg latency, 82% trust score","source_url":"https://df.x420.dev"},{"claim":"Payment is in USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) to address 0x93109d14F6665a9c9675290D3cD5A6c07bBAfdbd","source_url":"https://df.x420.dev/api/puff-custom"},{"claim":"The amount field defaults to 5 USDC if not provided","source_url":"https://df.x420.dev/api/puff-custom"}],"useCases":["Agents autonomously purchasing $df tokens with USDC on Base","Programmatic token swaps triggered by on-chain or off-chain signals","Integrating pay-per-call token purchases into automated trading workflows"],"bestFor":["AI agents that need to autonomously acquire specific tokens on Base","Developers experimenting with x402 payment-gated DeFi endpoints","Automated strategies that buy small amounts of meme/community tokens"],"notFor":["Large-volume or high-frequency trading (max 5 USDC per call, minimal liquidity signals)","Users seeking tokens on networks other than Base","Anyone needing detailed API documentation or SLA guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:10.357Z"},"updatedAt":"2026-04-23T02:00:16.040Z"}}