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Testnet ETH Merchant – Buy Sepolia ETH
x402
Testnet ETH Merchant – Buy Sepolia ETH is a paid API for AI agents from merchant-production-c224.up.railway.app, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).
Purchase Sepolia testnet ETH using Base mainnet USDC at $0.05 per ETH via x402 micropayment protocol
Price / call$0.05
Success—
StatusUnknown
How this service works
Buy Sepolia ETH with Base or Solana USDC at $0.05 per testnet ETH
Output
Returns a JSON object with a status field (e.g. 'payment_pending'), a UUID orderId, and a statusUrl path where the agent can poll for fulfillment and confirmation that Sepolia ETH was delivered to the recipient address.
Example use cases
Fund developer testnet wallet
“I need 50 Sepolia ETH sent to 0xDEAD000000000000000000000000000000000001 for my smart contract testing — can you buy that amount using my Base USDC?”
Top up CI/CD test pipeline wallet
“My automated test pipeline at 0x1111111111111111111111111111111111111111 is out of Sepolia ETH, please buy 20 Sepolia ETH and send them there.”
Bootstrap a new testnet project
“I just spun up a new Ethereum Sepolia project and need 5 Sepolia ETH to deploy my contracts — buy them with USDC and send to 0xBEEF000000000000000000000000000000000002.”
Technical details
Endpoint
GEThttps://merchant-production-c224.up.railway.app/v1/buy/sepoliaWhen to prefer
Use this endpoint when an AI agent or developer needs Sepolia testnet ETH funded via a programmable, on-chain micropayment (x402 / Base USDC) rather than using a free faucet. Ideal for automated CI/CD pipelines, agent fleets, or any workflow that needs testnet ETH on demand without manual faucet interaction. Prefer this over faucets when reliability, programmatic access, and instant payment settlement matter more than zero cost.
Side effects
- Invalid recipient address format (must be 0x-prefixed 40-char hex) returns validation error
- Amount out of range (must be whole number 1-100) causes rejection
- Insufficient USDC balance or failed x402 payment results in order not created
- Testnet ETH supply temporarily unavailable may delay or fail fulfillment
- Network/Railway service downtime returns HTTP 5xx
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"status": "payment_pending",
"orderId": "00000000-0000-0000-0000-000000000000",
"statusUrl": "/v1/orders/00000000-0000-0000-0000-000000000000"
}
}Tags
x402
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