# Strale Exchange Rate API

> Strale Exchange Rate API is a paid API for AI agents from api.strale.io, paid per call via x402, $0.0216/call, status unknown (last checked 2026-09-15).

Returns the current exchange rate between two ISO 4217 currencies with an auditable cryptographic record

## Facts

- Endpoint: GET https://api.strale.io/x402/v2/exchange-rate
- Price: $0.0216/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/strale-exchange-rate-api-d9277515
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WRcd3O-Bb4RdmiJDPloxh

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 strale-exchange-rate-api-d9277515
```

Example prompt: What's the current exchange rate from USD to EUR? I need a verified, auditable rate with a cryptographic record.

## When to prefer this

Choose this endpoint when you need a currency exchange rate with a cryptographic audit trail attached — ideal for compliance-sensitive workflows, AI agent pipelines requiring verifiable data provenance, or any context where you need proof of what rate was used and when. Less suited for high-frequency trading requiring sub-millisecond latency.

## Known failure modes

- Invalid or unsupported ISO 4217 currency code returns an error
- Rate data temporarily unavailable from upstream provider
- Payment failure (insufficient USDC balance) blocks the call
- Missing required 'from' or 'to' query parameters returns a validation error

## How this service works

The trust layer for AI agents — 250+ independently tested data capabilities across 27 countries. Execute capabilities via REST, MCP, A2A, or x402 micropayments. Every call returns an audit record with cryptographic chain hashing.

## Output

Returns the current exchange rate between the specified source and target ISO 4217 currency pair, along with a structured audit record that includes a cryptographic chain hash for provenance and verification purposes.

## 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"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "from",
      "to"
     ],
     "properties": {
      "to": {
       "type": "string",
       "description": "Target currency (ISO 4217, e.g. EUR)"
      },
      "from": {
       "type": "string",
       "description": "Source currency (ISO 4217, e.g. USD)"
      }
     }
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/strale-exchange-rate-api-d9277515/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.strale.io](https://www.zero.xyz/host/api.strale.io/llms.txt)