{"id":"a9b89501-79b3-444b-87ca-65c2ddc3a993","shortId":"aXbZez","kind":"x402","title":"Purchase 5 USDC worth of x420 tokens on Base via x402 payment protocol.","tagline":"Purchase 5 USDC worth of x420 tokens on Base via x402 payment protocol.","description":"This x402-enabled endpoint allows agents and users to buy 5 USDC worth of x420 tokens (contract 0x68e284F21D04D4D62398C290EC3EF41C97F80b07) on the Base network. The endpoint accepts an x402 payment of exactly 5 USDC (5,000,000 units in 6-decimal USDC) and executes a token swap, returning the x420 tokens to the buyer.\n\nThe x420 token was created via Clanker and is associated with a dedicated x402 storefront at x420.x420.dev. The storefront reports a 100% success rate across transactions, with an average latency of approximately 2.29 seconds. The response includes the swap transaction hash, send transaction hash, the number of tokens received, and the USDC amount paid.\n\nPayment is sent to address 0x93109d14F6665a9c9675290D3cD5A6c07bBAfdbd using USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base. The endpoint uses the x402 \"exact\" payment scheme with a maximum timeout of 120 seconds. No OpenAPI spec or detailed documentation is available beyond the x402 challenge metadata and the storefront landing page.","tags":[],"capabilities":["x402-payment","token-swap","base-network","usdc-payment","erc20-purchase"],"categories":["crypto","defi"],"synonyms":["x420 token buy","x420 puff","buy x420 usdc","x402 token swap","base token purchase","clanker token","x420 swap"],"warnings":["No OpenAPI specification available","Documentation pages (docs, api, pricing, README) all return 404-equivalent pages","Response example is inferred from the outputSchema in the x402 challenge, not from an actual observed response","This endpoint involves purchasing a cryptocurrency token — regulatory considerations may apply","Fixed denomination only (5 USDC); no flexibility in purchase amount at this endpoint"],"endpointUrl":"https://x420.x420.dev/api/puff-5","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://x420.x420.dev/api/puff-5","description":"Buy 5 USDC worth of x420 tokens 0x68e284F21D04D4D62398C290EC3EF41C97F80b07","outputSchema":{"input":{"type":"http","method":"GET"},"output":{"message":"string","tokensReceived":"string","usdcAmountPaid":"string","sendTransactionHash":"string | null","swapTransactionHash":"string | null"}},"maxAmountRequired":"5000000","maxTimeoutSeconds":120}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge provides a clear output schema and payment details, but there is no OpenAPI spec, no dedicated documentation (docs/api/pricing pages all 404), and the response example is inferred from the output schema rather than observed. The endpoint is live with reported 100% success rate but information is 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'0x68e284f21d04d4d62398c290ec3ef41c97f80b07':45 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':142 '0x93109d14f6665a9c9675290d3cd5a6c07bbafdbd':139 '100':101 '120':158 '2.29':112 '5':2,15,38,58,60 '6':65 'accept':52 'across':104 'address':138 'agent':33 'allow':32 'amount':132 'approxim':111 'associ':89 'avail':167 'averag':108 'base':9,22,48,144 'base token purchase' 'base-network' 'beyond':168 'buy':37 'buy x420 usdc' 'buyer':79 'challeng':171 'clanker':86 'clanker token' 'contract':44 'creat':84 'decim':66 'dedic':92 'detail':164 'document':165 'enabl':30 'endpoint':31,51,146 'erc20-purchase' 'exact':57,150 'execut':69 'hash':120,123 'includ':116 'land':176 'latenc':109 'maximum':155 'metadata':172 'network':49 'number':125 'openapi':161 'page':177 'paid':133 'payment':12,25,55,134,151 'protocol':13,26 'purchas':1,14 'rate':103 'receiv':128 'report':99 'respons':115 'return':73 'scheme':152 'second':113,159 'send':121 'sent':136 'spec':162 'storefront':94,98,175 'success':102 'swap':72,118 'timeout':156 'token':7,20,43,71,76,82,127 'token-swap' 'transact':105,119,122 'unit':63 'usdc':3,16,39,59,67,131,141 'usdc-payment' 'use':140,147 'user':35 'via':10,23,85 'worth':4,17,40 'x402':11,24,29,54,93,149,170 'x402 token swap' 'x402-enabled':28 'x402-payment' 'x420':6,19,42,75,81 'x420 puff' 'x420 swap' 'x420 token buy' 'x420.x420.dev':96","prices":[{"id":"4a385d4c-e206-4b23-a095-4562c46a1063","listingId":"a9b89501-79b3-444b-87ca-65c2ddc3a993","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://x420.x420.dev/api/puff-5","description":"Buy 5 USDC worth of x420 tokens 0x68e284F21D04D4D62398C290EC3EF41C97F80b07","outputSchema":{"input":{"type":"http","method":"GET"},"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":"2026-04-18T18:30:33.229Z"}],"sources":[{"listingId":"a9b89501-79b3-444b-87ca-65c2ddc3a993","source":"x402_bazaar","sourceId":"https://x420.x420.dev/api/puff-5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:30:33.229Z","lastSeenAt":"2026-04-23T04:00:34.361Z"}],"details":{"listingId":"a9b89501-79b3-444b-87ca-65c2ddc3a993","quickStartSnippet":"curl -X GET https://x420.x420.dev/api/puff-5 \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":{"message":"Successfully purchased x420 tokens","tokensReceived":"1000000000000000000","usdcAmountPaid":"5000000","sendTransactionHash":"0x789abc...012def","swapTransactionHash":"0xabc123...def456"},"schema":{"input":{"type":"http","method":"GET"},"output":{"message":"string","tokensReceived":"string","usdcAmountPaid":"string","sendTransactionHash":"string | null","swapTransactionHash":"string | null"}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint accepts 5 USDC (maxAmountRequired: 5000000) on Base network using the exact payment scheme","source_url":"https://x420.x420.dev/api/puff-5"},{"claim":"The x420 token contract address is 0x68e284F21D04D4D62398C290EC3EF41C97F80b07","source_url":"https://x420.x420.dev"},{"claim":"The storefront reports 100% success rate, 2.29s average latency, and 10 total transactions","source_url":"https://x420.x420.dev"},{"claim":"The token was created via Clanker","source_url":"https://x420.x420.dev"},{"claim":"Payment is sent to 0x93109d14F6665a9c9675290D3cD5A6c07bBAfdbd using USDC asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://x420.x420.dev/api/puff-5"}],"useCases":["Programmatic purchase of x420 tokens using USDC on Base","Agent-driven token acquisition via x402 payment protocol","Automated portfolio building that includes meme/community tokens"],"bestFor":["AI agents that need to purchase tokens via x402 without manual wallet interaction","Developers experimenting with x402 payment-gated token swaps","Users wanting a fixed 5 USDC denomination token purchase"],"notFor":["Variable-amount token purchases (this endpoint is fixed at 5 USDC)","Purchasing tokens on networks other than Base","Users seeking detailed API documentation or OpenAPI specs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:31.665Z"},"updatedAt":"2026-04-23T04:00:34.361Z"}}