# Prysm Exchange Rate Provider

> Prysm Exchange Rate Provider is a paid API for AI agents from prysm-kappa.vercel.app, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).

Fetches the latest foreign exchange rates for currency pairs via the Prysm x402-gated exchange rate provider on Base mainnet.

## Facts

- Endpoint: POST https://prysm-kappa.vercel.app/api/v1/providers/exchangerate
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/prysm-exchange-rate-provider-0ce8d979
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_28gSgQbnPmWDM_U-wW4JH

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 prysm-exchange-rate-provider-0ce8d979 -d '<json body>'
```

Example prompt: What's the latest exchange rate from USD to EUR? Use the Prysm exchange rate provider to get the current rate.

## When to prefer this

Choose this endpoint when you need real-time or latest foreign exchange rate data within an agent workflow that supports x402 micropayments on Base mainnet with USDC, especially when building fintech automations, travel cost estimators, or multi-currency financial tools at low per-call cost ($0.05 USDC).

## Known failure modes

- Unsupported currency pair returns an error or empty data
- Invalid operation name results in a rejection
- Payment failure on Base mainnet prevents the call from completing
- Rate data temporarily unavailable due to upstream provider outage
- Malformed input object causes a 400-level error

## How this service works

Prysm sells paid, agent-ready provider capabilities over x402 on Base mainnet using USDC.

## Output

A JSON response containing the provider name ('exchangerate'), the operation used (e.g. 'latest'), and a data object with the retrieved exchange rate information including currency pair rates and potentially a timestamp or base currency.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "input": {
   "type": "object",
   "description": "Provider-specific operation parameters.",
   "additionalProperties": true
  },
  "operation": {
   "type": "string",
   "description": "Allowlisted operation for the selected provider."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {},
  "provider": "exchangerate",
  "operation": "latest"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/prysm-exchange-rate-provider-0ce8d979/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from prysm-kappa.vercel.app](https://www.zero.xyz/host/prysm-kappa.vercel.app/llms.txt)