# CoW Protocol Batch Auction Latest Results

> CoW Protocol Batch Auction Latest Results is a paid API for AI agents from api.chainmarket-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-24).

Fetches the latest CoW Protocol batch auction competition results, including winning solver, scores, and top solutions from Ethereum mainnet.

## Facts

- Endpoint: GET https://api.chainmarket-api.workers.dev/api/crypto/cowswap-batch-auctions?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-24
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/cow-protocol-batch-auction-latest-results-4f0342bb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8ETBgUaPx9SpOnXKwbVKM

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 cow-protocol-batch-auction-latest-results-4f0342bb
```

Example prompt: Who won the latest CoW Protocol batch auction on Ethereum mainnet — show me the winning solver address, their score, and the transaction hash?

## When to prefer this

Choose this endpoint when you need real-time, no-signup access to the latest CoW Protocol (CoW Swap) solver competition results on Ethereum mainnet. Prefer it over querying the CoW API directly when you want pay-per-call access without API key registration, or when building agents that need periodic auction monitoring without managing credentials.

## Known failure modes

- CoW Protocol API upstream unavailability returning 503 or timeout
- No auction data if CoW Protocol mainnet is paused or inactive
- Stale data if the upstream CoW API has a delay
- Payment failure if USDC balance is insufficient (call not charged on failure)

## How this service works

CoW Protocol (Ethereum) latest batch auction result: auction id and block window, number of solver solutions, the winning solution (solver, score, ranking, settlement tx), and the top five solutions by ranking. Order details and clearing prices are not returned in this summary.

## Output

Returns a JSON object with the latest CoW Protocol batch auction details including: auction ID, the winning solver's address, score, transaction hash, and ranking; an ordered list of top solutions with their scores, solver addresses, and whether they were filtered out; the total solution count; the auction start and deadline block numbers; and the timestamp when data was checked.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "source": "https://api.cow.fi/mainnet/api/v2/solver_competition/latest",
  "winner": {
   "score": "1840915047916452",
   "txHash": "0xcc3d963ee09ba0cd1c7b913d38077486c7d2805b0718786daf7923ec738857ab",
   "ranking": 1,
   "isWinner": true,
   "filteredOut": false,
   "solverAddress": "0x5ed864e8f37dcb4f79c5172a815d1b3a9147eaab"
  },
  "fastPath": false,
  "auctionId": 14085941,
  "checkedAt": "2026-10-23T09:36:04.956Z",
  "topSolutions": [
   {
    "score": "1840915047916452",
    "txHash": "0xcc3d963ee09ba0cd1c7b913d38077486c7d2805b0718786daf7923ec738857ab",
    "ranking": 1,
    "isWinner": true,
    "filteredOut": false,
    "solverAddress": "0x5ed864e8f37dcb4f79c5172a815d1b3a9147eaab"
   },
   {
    "score": "1839997173481749",
    "txHash": null,
    "ranking": 2,
    "isWinner": false,
    "filteredOut": false,
    "solverAddress": "0x5c3593481cba011737e36ded62f1797c9f6afce1"
   }
  ],
  "solutionCount": 12,
  "auctionStartBlock": 26254464,
  "auctionDeadlineBlock": 26254466
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cow-protocol-batch-auction-latest-results-4f0342bb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.chainmarket-api.workers.dev](https://www.zero.xyz/host/api.chainmarket-api.workers.dev/llms.txt)