# Blockscout Coin Balance History by Day

> Blockscout Coin Balance History by Day is a paid API for AI agents from api.blockscout.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-10).

Returns the daily native coin (ETH, etc.) balance history for a specific address on a given blockchain network

## Facts

- Endpoint: GET https://api.blockscout.com/%7Bchain_id%7D/api/v2/addresses/%7Baddress_hash_param%7D/coin-balance-history-by-day
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blockscout-coin-balance-history-by-day-9b335893
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_aY_Zzy9YmnfYr5dhqB-O3

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 blockscout-coin-balance-history-by-day-9b335893
```

Example prompt: Can you pull the daily native coin balance history for wallet address 0xAbCd1234... on Ethereum using Blockscout, so I can see how the balance changed over time?

## When to prefer this

Use this endpoint when you need a time-series of daily native coin (e.g. ETH, MATIC, BNB) balance snapshots for a specific wallet address on a supported chain. It is ideal for portfolio analytics, balance trend visualization, compliance audits, or detecting unusual inflow/outflow patterns over time. Prefer this over transaction list endpoints when you want aggregated daily balances rather than individual transaction records.

## Known failure modes

- Invalid or unsupported chain_id returns an error or empty response
- Malformed address hash returns a 400-level error
- Address with no transaction history may return empty items array
- Chain not supported by Blockscout returns a 404 or error
- Rate limiting or payment failure results in 402 or 429 response

## How this service works

Explore crypto activities with Blockscout's multichain search. Find transactions, addresses, tokens, and dapps across top blockchain networks — your go-to explorer for cross-chain blockchain data

## Output

Returns a JSON object containing a 'days' count and an 'items' array, where each item has a 'date' string and a 'value' string representing the native coin balance on that date for the given address on the specified chain.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "properties": {
      "chain_id": {
       "type": "string"
      },
      "address_hash_param": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "days": 0,
  "items": [
   {
    "date": "string",
    "value": "string"
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blockscout-coin-balance-history-by-day-9b335893/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.blockscout.com](https://www.zero.xyz/host/api.blockscout.com/llms.txt)