# Obol USDC/USD Spot Price Feed

> Obol USDC/USD Spot Price Feed is a paid API for AI agents from obol-x402.fly.dev, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).

Returns the current USDC/USD spot price aggregated from Coinbase and Kraken, with a divergence flag and cryptographic Ed25519 signature on every response.

## Facts

- Endpoint: GET https://obol-x402.fly.dev/v1/price/USDC
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/obol-usdc-usd-spot-price-feed-757b70dd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Iw2efuDJ4xp3f6J0KWbaI

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 obol-usdc-usd-spot-price-feed-757b70dd
```

Example prompt: What's the current USDC/USD spot price right now, and is there any divergence between Coinbase and Kraken? Give me a signed quote I can verify.

## When to prefer this

Choose this endpoint when you need a cryptographically signed, independently verifiable USDC/USD price that has been cross-checked between Coinbase and Kraken. It is especially useful for agents that need tamper-proof stablecoin pricing, want to detect USDC depeg events, or require exchange-level divergence signals rather than a single-source quote.

## Known failure modes

- Exchange API unavailable — one or both upstream price sources (Coinbase/Kraken) may be unreachable, resulting in an error or partial response
- Payment not received — x402 protocol requires $0.01 USDC payment per call; missing or invalid payment header returns 402
- Signature verification failure — Ed25519 signature may fail if payload was tampered in transit
- Rate limiting — repeated calls without valid payment may be throttled or rejected

## How this service works

USDC USD spot price stablecoin quote Coinbase Kraken with divergence flag. Single-asset USDC/USD for AI agents. Cryptographically signed (Ed25519) — every response is independently verifiable via /.well-known/obol-pubkey.

## Output

Returns a JSON object containing the USDC/USD spot price aggregated from Coinbase and Kraken, a boolean or flag indicating whether the two exchanges show price divergence, and an Ed25519 cryptographic signature over the response payload that can be independently verified against the public key at /.well-known/obol-pubkey.

## 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",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/obol-usdc-usd-spot-price-feed-757b70dd/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from obol-x402.fly.dev](https://www.zero.xyz/host/obol-x402.fly.dev/llms.txt)