The base-swap 0x trade wrapped in a Cobalt validity transaction
The base-swap 0x trade wrapped in a Cobalt validity transaction: Base holds your signed tx dormant until your conditions hold, then includes it — a good-till-block/conditional order, no limit-order contract, nobody holding the trade. We never hold funds or keys; you sign and submit to Base's sequencer. Conditions: beforeBlock (a deadline), fromBlock, flashblockIndex, minNativeBalanceWei, or a caller-supplied storage predicate for price. At least one required.
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
GET https://402.com.tr/api/x402/base-swap-validity
| Category | Market data |
|---|---|
| Provider host | 402.com.tr |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
We never call tools that send, buy, move money or file anything, not even without paying.
Example input (from the provider)
{
"method": "GET",
"pathParams": {},
"queryParams": {
"amount": "10",
"beforeBlock": "40000000",
"buy": "ETH",
"flashblockIndex": "0",
"sell": "USDC",
"slippage": "100",
"storageOp": ">=",
"taker": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"pathParams": {
"type": "object"
},
"queryParams": {
"properties": {
"amount": {
"description": "Amount you sell",
"type": "string"
},
"beforeBlock": {
"description": "Deadline: before this block (recommended)",
"type": "string"
},
"buy": {
"description": "Token you buy",
"type": "string"
},
"flashblockIndex": {
"description": "Flashblock index (optional)",
"type": "string"
},
"fromBlock": {
"description": "Earliest block (optional)",
"type": "string"
},
"minNativeBalanceWei": {
"description": "Min taker ETH balance in wei (optional)",
"type": "string"
},
"sell": {
"description": "Token you sell",
"type": "string"
},
"slippage": {
"description": "Slippage in bps (optional, default 100)",
"type": "string"
},
"storageAddress": {
"description": "Advanced: pool/token for a storage condition",
"type": "string"
},
"storageMask": {
"description": "Advanced: mask (hex, optional)",
"type": "string"
},
"storageOp": {
"description": "Advanced: operator (< <= = != > >=)",
"type": "string"
},
"storageSlot": {
"description": "Advanced: storage slot (hex)",
"type": "string"
},
"storageValue": {
"description": "Advanced: compare value (hex)",
"type": "string"
},
"taker": {
"description": "Your wallet (signs the swap)",
"type": "string"
}
},
"required": [
"sell",
"buy",
"amount",
"taker"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}