{"id":"b4100408-35a7-4d92-b8d9-6fa314dce0eb","shortId":"4Srtqf","kind":"x402","title":"Buy yaoming tokens ($yaoming) on Base with USDC via x402 payment protocol","tagline":"Buy yaoming tokens ($yaoming) on Base with USDC via x402 payment protocol","description":"This x402 endpoint allows agents and users to purchase yaoming tokens (contract 0x73DB2BE4581BcE956501eD0e2156DC31939B2b07) on the Base network by paying with USDC. The endpoint accepts a POST request with an optional `amount` field specifying how much USDC to spend (defaults to 5 USDC if omitted, up to a maximum of 5 USDC per transaction based on the x402 challenge). Payment is handled via the x402 protocol's X-PAYMENT header using USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.\n\nThe response includes the swap transaction hash, send transaction hash, the number of tokens received, and the USDC amount paid. The token was created via Clanker and is hosted on the x420.dev platform, which provides x402-enabled storefronts for Clanker-launched tokens. No separate API documentation exists beyond the x402 challenge schema and the landing page.\n\nNote that this is a speculative memecoin token swap endpoint. The yaoming token has no documented utility beyond trading. The maximum payment per call is 5 USDC (5000000 in 6-decimal USDC units). The endpoint timeout is 120 seconds, reflecting the on-chain swap execution time.","tags":[],"capabilities":["token-swap","x402-payment","base-network","usdc-payment","erc20-purchase","on-chain-transaction"],"categories":["crypto","defi"],"synonyms":["yaoming token","buy yaoming","x420 puff","clanker token swap","base token purchase","USDC swap","memecoin buy","x402 token purchase"],"warnings":["No API documentation exists — /docs, /api, /pricing all return placeholder pages","This endpoint facilitates purchase of a speculative memecoin with no documented utility","Response example is inferred from outputSchema, not from an actual observed response","Maximum transaction size is 5 USDC, limiting practical use for larger trades"],"endpointUrl":"https://yaoming.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://yaoming.x420.dev/api/puff-custom","description":"Buy custom USDC amount worth of yaoming tokens 0x73DB2BE4581BcE956501eD0e2156DC31939B2b07","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":"0.550","qualityRationale":"The x402 challenge is live and includes a well-defined outputSchema with input/output fields. However, there is no API documentation (docs/api/pricing pages all return 'doesn't exist'), no OpenAPI spec, and the response example is inferred from the schema rather than observed. The endpoint is functional but documentation is 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'0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':97 '120':195 '5':65,74,183 '5000000':185 '6':187 'USDC swap' 'accept':48 'agent':29 'allow':28 'amount':55,118 'api':146 'base':6,18,40,78,99 'base token purchase' 'base-network' 'beyond':149,175 'buy':1,13 'buy yaoming' 'call':181 'chain':201 'challeng':82,152 'clanker':125,141 'clanker token swap' 'clanker-launch':140 'contract':36 'creat':123 'decim':188 'default':63 'document':147,173 'enabl':137 'endpoint':27,47,167,192 'erc20-purchase' 'execut':203 'exist':148 'field':56 'handl':85 'hash':106,109 'header':94 'host':128 'includ':102 'land':156 'launch':142 'maximum':72,178 'memecoin':164 'memecoin buy' 'much':59 'network':41 'note':158 'number':111 'omit':68 'on-chain':199 'on-chain-transaction' 'option':54 'page':157 'paid':119 'pay':43 'payment':11,23,83,93,179 'per':76,180 'platform':132 'post':50 'protocol':12,24,89 'provid':134 'purchas':33 'receiv':114 'reflect':197 'request':51 'respons':101 'schema':153 'second':196 'send':107 'separ':145 'specifi':57 'specul':163 'spend':62 'storefront':138 'swap':104,166,202 'time':204 'timeout':193 'token':3,15,35,113,121,143,165,170 'token-swap' 'trade':176 'transact':77,105,108 'unit':190 'usdc':8,20,45,60,66,75,96,117,184,189 'usdc-payment' 'use':95 'user':31 'util':174 'via':9,21,86,124 'x':92 'x-payment':91 'x402':10,22,26,81,88,136,151 'x402 token purchase' 'x402-enabled':135 'x402-payment' 'x420 puff' 'x420.dev':131 'yaom':2,4,14,16,34,169 'yaoming token'","prices":[{"id":"746aac04-69ac-4889-b082-d3b062eabb30","listingId":"b4100408-35a7-4d92-b8d9-6fa314dce0eb","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://yaoming.x420.dev/api/puff-custom","description":"Buy custom USDC amount worth of yaoming tokens 0x73DB2BE4581BcE956501eD0e2156DC31939B2b07","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":"2026-04-18T18:31:19.699Z"}],"sources":[{"listingId":"b4100408-35a7-4d92-b8d9-6fa314dce0eb","source":"x402_bazaar","sourceId":"https://yaoming.x420.dev/api/puff-custom","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:19.699Z","lastSeenAt":"2026-04-23T02:00:15.783Z"}],"details":{"listingId":"b4100408-35a7-4d92-b8d9-6fa314dce0eb","quickStartSnippet":"curl -X POST https://yaoming.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 yaoming tokens","tokensReceived":"150000.0","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 returns a maxAmountRequired of 5000000 (5 USDC) with USDC asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://yaoming.x420.dev/api/puff-custom"},{"claim":"The token contract is 0x73DB2BE4581BcE956501eD0e2156DC31939B2b07 and was created via Clanker","source_url":"https://yaoming.x420.dev"},{"claim":"The outputSchema specifies an optional amount field defaulting to 5 USDC and returns swapTransactionHash, sendTransactionHash, tokensReceived, and usdcAmountPaid","source_url":"https://yaoming.x420.dev/api/puff-custom"},{"claim":"The endpoint timeout is 120 seconds","source_url":"https://yaoming.x420.dev/api/puff-custom"}],"useCases":["Programmatically purchasing yaoming tokens using USDC on Base","Agent-driven token accumulation or portfolio building","Automated memecoin trading via x402-compatible wallets"],"bestFor":["AI agents that need to execute on-chain token swaps via HTTP","Developers building x402-integrated trading bots","Users wanting a simple HTTP-based interface to buy a specific Clanker token"],"notFor":["Purchasing tokens on networks other than Base","Swapping tokens other than yaoming","Large trades exceeding 5 USDC per transaction"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:11.663Z"},"updatedAt":"2026-04-23T02:00:15.783Z"}}