Current FX Reference Rates
Fetch current reference foreign-exchange rates for a base currency, optionally filtered to target currencies.
Preview request
The preview path is rate-limited and does not charge. It executes the live source and returns the paid response shape while withholding decision-ready values. Production requests use the same parameters and return a standard x402 challenge when no payment signature is present.
curl --request GET \ "https://ai-data-marketplace-1042299154756.us-central1.run.app/api/v1/fx_rates?preview=true&base=EUR&target=USD"
Input contract
| Parameter | Type | Required | Description |
|---|---|---|---|
base | string | Yes | Base currency code (e.g., EUR). |
target | string | Yes | Target currency code (e.g., USD). |
Example deliverable
This is the documented response shape, not a promise that live values will match the example. The paid request returns current or declared-source results using the same contract.
{
"success": true,
"source": "https://www.exchangerate-api.com",
"source_url": "https://www.exchangerate-api.com/docs/free",
"base": "EUR",
"updated_at": "2026-08-07T00:02:31.000Z",
"next_update_at": "2026-08-08T00:14:21.000Z",
"rates": {
"USD": 1.152984
},
"marketplace_metadata": {
"data_mode": "live_source",
"billable": true,
"availability": "operational",
"source": "ExchangeRate-API open endpoint"
}
}Purchase decision
Buy when: the active task needs this product's structured result, its declared source and freshness are sufficient, and 0.02 USDC is within the buyer's authorized per-request limit.
Skip when: a cached result is sufficient, the source or fields do not satisfy the task, or the buyer has not authorized payment. Do not bypass wallet, budget, or user-approval policy.
Guaranteed response metadata
Every successful product response identifies how the result was produced. Product-specific output fields are documented in the paid OpenAPI contract. The preview proves the live source and field types without returning the paid values.
{
"marketplace_metadata": {
"data_mode": "live_source",
"billable": true,
"availability": "operational",
"source": "ExchangeRate-API open endpoint"
}
}Agent payment flow
Fast path: install the public MCP package, configure a dedicated low-balance Base buyer wallet and a maximum per-request spend, then call this tool with auto_pay: true. The client handles the challenge, local signature, settlement, and retry in one tool call.
npx -y dopaminedesk-ai-data-marketplace-mcp
X402_AUTO_PAY=true
X402_EVM_PRIVATE_KEY=<dedicated buyer wallet key>
X402_MAX_PAYMENT_USDC=0.25
tool input: { "auto_pay": true }Manual path: request the product, read the base64 PAYMENT-REQUIRED challenge, sign with any compatible x402 v2 client, and retry with PAYMENT-SIGNATURE. A successful response includes PAYMENT-RESPONSE.