{"id":"31dd0449-173f-4dd3-9d97-46c617fdde90","shortId":"RYT7CX","kind":"x402","title":"x402-payable endpoint on Base returning a simple message for USDC micropayment.","tagline":"x402-payable endpoint on Base returning a simple message for USDC micropayment.","description":"Spark x420 is an x402-enabled HTTP endpoint hosted at x420.dev that returns a JSON message in exchange for a USDC micropayment on the Base network. The endpoint uses the x402 protocol (HTTP 402 payment-required flow): a client sends a GET request, receives a 402 challenge specifying the payment terms, and after providing an X-PAYMENT header with a valid USDC payment, receives a JSON response containing a message string.\n\nThe x420.dev platform is a \"launchpad\" for deploying x402-ready tokens with dedicated subdomains and APIs. Each deployed token gets instant liquidity on Clanker, with trading fees going to the deployer. The platform also describes a complementary \"HTTP 420 Enhance Your Calm\" protocol for graceful rate limiting and throttling, allowing agents to negotiate cooldown periods. The Spark endpoint specifically accepts payments up to 1 USDC (1,000,000 units in 6-decimal USDC) on Base, paid to address 0x93109d14F6665a9c9675290D3cD5A6c07bBAfdbd.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README paths all return \"Subdomain Not Found\" errors. There is no OpenAPI spec, no detailed API documentation, and the output schema only specifies a single \"message\" field of type string. The actual content or utility of the returned message is unknown from available materials.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","http-get","json-response"],"categories":["crypto","payments"],"synonyms":["x402 endpoint","USDC paywall","micropayment API","Base network payment","HTTP 402 API","pay-per-request","x420 spark"],"warnings":["No API documentation available — /docs, /api, /pricing, /README all return 'Subdomain Not Found'","No OpenAPI or schema beyond the minimal outputSchema in the x402 challenge","Actual response content/utility of the 'message' field is unknown","Platform appears experimental; no SLA or uptime guarantees documented"],"endpointUrl":"https://x420.dev/api/spark","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.dev/api/spark","description":"Spark x420","outputSchema":{"input":{"type":"http","method":"GET"},"output":{"message":"string"}},"maxAmountRequired":"1000000","maxTimeoutSeconds":120}]},"qualityScore":"0.200","qualityRationale":"Minimal documentation exists — /docs, /api, /pricing, and /README all 404. The only concrete information comes from the x402 challenge header. No OpenAPI spec, no examples, no description of what the message contains. Effectively a stub 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x420","outputSchema":{"input":{"type":"http","method":"GET"},"output":{"message":"string"}},"maxAmountRequired":"1000000","maxTimeoutSeconds":120}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":120},"createdAt":"2026-04-18T18:30:36.837Z"}],"sources":[{"listingId":"31dd0449-173f-4dd3-9d97-46c617fdde90","source":"x402_bazaar","sourceId":"https://x420.dev/api/spark","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:30:36.837Z","lastSeenAt":"2026-04-25T03:01:18.686Z"}],"details":{"listingId":"31dd0449-173f-4dd3-9d97-46c617fdde90","quickStartSnippet":"curl -X GET https://x420.dev/api/spark \\\n  -H \"X-PAYMENT: <base-usdc-payment-token>\"","exampleRequest":null,"exampleResponse":{"message":"string"},"schema":{"input":{"type":"http","method":"GET"},"output":{"message":"string"}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint accepts USDC payments on Base network with maxAmountRequired of 1,000,000 (1 USDC)","source_url":"https://x420.dev/api/spark"},{"claim":"x420.dev is a launchpad for deploying x402-ready tokens with dedicated subdomains and x402 APIs","source_url":"https://x420.dev"},{"claim":"Each token gets instant liquidity on Clanker, earning trading fees for the deployer","source_url":"https://x420.dev"},{"claim":"The platform describes an HTTP 420 'Enhance Your Calm' protocol for rate limiting and throttling","source_url":"https://x420.dev"},{"claim":"/docs, /api, /pricing, /README paths all return 'Subdomain Not Found'","source_url":"https://x420.dev/docs"}],"useCases":["Testing x402 payment protocol integrations","Demonstrating USDC micropayments on Base to AI agents","Prototyping pay-per-call API workflows"],"bestFor":["Developers experimenting with x402 protocol","Testing agent-to-API micropayment flows on Base","Learning how HTTP 402 payment challenges work"],"notFor":["Production APIs requiring well-documented 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