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Foundry: x402 Preflight and Base Contract Facts
x402
Foundry: x402 Preflight and Base Contract Facts is a paid API for AI agents from minty-sprout.onrender.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-11-01).
Checks x402 payment endpoints for trustworthiness before paying them, and reads proxy, owner, and privileged role data from Base smart contracts on-chain.
Price / call$0.01
Success—
StatusUnknown
How this service works
Pay-per-call data for agents: check x402 sellers before paying them, and read Base contracts' proxy, owner and privileged powers straight from the chain.
Output
Returns trust signals and metadata about an x402 payment endpoint (such as domain age, suspicious patterns, and payment history signals) and/or on-chain facts about a Base contract including its proxy implementation address, owner address, and any privileged or admin roles assigned to specific addresses.
Example use cases
Preflight check before paying x402 seller
“I'm about to pay an x402 endpoint at https://api.example.com/premium-feed — can you screen it first and tell me if it looks safe to pay?”
Inspect Base contract ownership and proxy
“Who owns the Base contract at 0x1234567890abcdef1234567890abcdef12345678? I also want to know what proxy it uses and which addresses have admin or privileged powers.”
Combine x402 trust check with contract audit
“Screen the x402 seller at https://data.myproject.xyz/stream and also pull the on-chain facts for the contract it references at 0xdeadbeef... — I want to see the owner, proxy, and any special roles before I commit to paying.”
Technical details
Endpoint
POSThttps://minty-sprout.onrender.com/v1/injection-screen?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to vet an x402 payment seller before committing funds, or when it needs to quickly audit a Base smart contract's control structure (proxy, owner, privileged roles) without writing custom RPC calls. Prefer this over raw RPC lookups when you want a single, pre-parsed response covering both x402 trust signals and on-chain contract facts in one call.
Side effects
- Invalid or unreachable x402 URL returns an error or empty trust signals
- Non-existent or non-contract Base address returns no contract data
- Malformed input string causes a 400-level error
- Rate limiting or server unavailability on the Render-hosted service returns 5xx
- Contract with no proxy or ownership pattern returns null for those fields
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | string |
Tags
x402
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