# Blockle Exchange — Non-Custodial Atomic-Swap Payment

> Blockle Exchange — Non-Custodial Atomic-Swap Payment is a paid API for AI agents from exchange.blockle.org, paid per call via x402, $1/call, status unknown (last checked 2026-10-22).

Submit a USDC payment on the Blockle non-custodial exchange to buy BLOCK tokens, pay a self-serve listing fee, or settle a priced action identified by an actionId.

## Facts

- Endpoint: POST https://exchange.blockle.org/x402/pay?utm_source=zero.xyz
- Price: $1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blockle-exchange-non-custodial-atomic-swap-payment-0fad96fe
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2gCNCsSe6QhhLwx4qTOV-

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability blockle-exchange-non-custodial-atomic-swap-payment-0fad96fe -d '<json body>'
```

Example prompt: I want to buy BLOCK tokens on the Blockle exchange — pay $5 USDC and settle action ID 'buy-block-001' for me.

## When to prefer this

Choose this endpoint when you need to interact specifically with the Blockle non-custodial atomic-swap exchange — buying BLOCK tokens, paying self-serve listing fees, or settling a specific priced action identified by an actionId. Prefer this over custodial exchange APIs when non-custodial, atomic settlement is required and when the target asset is BLOCK.

## Known failure modes

- Insufficient USDC balance — payment rejected
- Invalid or unrecognized actionId — action not found or already settled
- USD amount below minimum threshold — request rejected
- x402 payment protocol error — malformed payment header
- Network or exchange downtime — service unavailable
- Double-spend or replay attempt — settlement rejected

## How this service works

Pay USDC over x402 to buy BLOCK, pay self-serve listing fees, or settle a priced action on the non-custodial Blockle exchange.

## Output

A generic JSON object confirming whether the payment or settlement was accepted, potentially including transaction details, action outcome status, or confirmation of the settled trade on the Blockle non-custodial exchange.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "usd",
  "actionId"
 ],
 "properties": {
  "usd": {
   "type": "number"
  },
  "actionId": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blockle-exchange-non-custodial-atomic-swap-payment-0fad96fe/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from exchange.blockle.org](https://www.zero.xyz/host/exchange.blockle.org/llms.txt)