# Blockle Exchange — Non-Custodial Atomic-Swap Asset Listing

> Blockle Exchange — Non-Custodial Atomic-Swap Asset Listing is a paid API for AI agents from exchange.blockle.org, paid per call via x402, $5/call, status unknown (last checked 2026-10-22).

List a new asset or token pair on the Blockle non-custodial atomic-swap exchange by paying a self-serve listing fee in USDC via x402.

## Facts

- Endpoint: POST https://exchange.blockle.org/x402/list?utm_source=zero.xyz
- Price: $5/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-asset-listing-e7b17d1b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_IJ90gExD6wKVjrixWBDQP

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-asset-listing-e7b17d1b -d '<json body>'
```

Example prompt: List my token called MYTKN on the Blockle non-custodial exchange and add an extra MYTKN/ETH trading pair — go ahead and pay the $5 USDC listing fee.

## When to prefer this

Choose this endpoint when you need to self-serve list a new asset or token on the Blockle non-custodial atomic-swap exchange, add extra trading pairs, or settle a priced action on the Blockle platform — specifically when the listing fee payment via x402/USDC is acceptable and non-custodial atomic-swap mechanics are desired over a custodial CEX listing.

## Known failure modes

- Insufficient USDC balance to cover the $5 listing fee — payment rejected
- Asset object malformed or missing required fields — validation error
- Duplicate listing attempt for an already-listed asset — conflict error
- x402 payment header missing or invalid — 402 Payment Required
- Exchange temporarily unavailable — 5xx server error
- Extra trading pair format invalid — schema validation failure

## 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

Returns a JSON object confirming the listing submission, including any settlement details, listing status, or confirmation identifiers for the newly listed asset and trading pairs on the Blockle exchange.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "asset"
 ],
 "properties": {
  "asset": {
   "type": "object"
  },
  "extraPairs": {
   "type": "array"
  }
 }
}
```

## 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-asset-listing-e7b17d1b/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)