# Obol PayAI Crypto Spot Prices

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

Returns real-time USD spot prices for BTC, ETH, SOL, USDC, and USDT in one call, aggregated from Coinbase and Kraken, with stale-price and price-divergence flags, cryptographically signed via Ed25519.

## Facts

- Endpoint: GET https://obol-payai.fly.dev/prices
- 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-payai-crypto-spot-prices-cf4060fe
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TaqhXhFwr3jBUyW8-0kTw

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-payai-crypto-spot-prices-cf4060fe
```

Example prompt: What are the current USD spot prices for BTC, ETH, SOL, USDC, and USDT right now — pulled from both Coinbase and Kraken — and flag any stale or diverging quotes?

## When to prefer this

Prefer this endpoint when you need a single low-latency call for USD spot prices across BTC, ETH, SOL, USDC, and USDT with built-in cross-exchange validation and cryptographic verifiability. Ideal for AI trading agents, portfolio tickers, and automated trade-sizing logic that require tamper-evident price data and stale/divergence detection rather than trusting a single exchange feed.

## Known failure modes

- Exchange API downstream outage causes stale-price flag to be set rather than returning an error
- Price divergence flag set when Coinbase and Kraken quotes differ beyond threshold — agent should treat prices with caution
- HTTP 402 Payment Required if x402 USDC micropayment is not included or fails
- HTTP 503 if the fly.dev host is unavailable or cold-starting
- Signature verification failure if public key at /.well-known/obol-pubkey is unreachable

## How this service works

Current USD spot price for BTC ETH SOL USDC USDT in ONE call — cross-exchange Coinbase and Kraken quotes with stale-price and price-divergence flag for trade sizing and portfolio ticks. Real-time crypto spot prices for AI trading agents. Cryptographically signed (Ed25519) — every response is independently verifiable via /.well-known/obol-pubkey.

## Output

A JSON object containing real-time USD spot prices for BTC, ETH, SOL, USDC, and USDT sourced from Coinbase and Kraken, along with a stale-price boolean flag, a price-divergence flag indicating cross-exchange spread anomalies, and an Ed25519 cryptographic signature for independent verification.

## 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-payai-crypto-spot-prices-cf4060fe/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from obol-payai.fly.dev](https://www.zero.xyz/host/obol-payai.fly.dev/llms.txt)