# Obol SOL/USD Spot Price (Signed, Cross-Exchange)

> Obol SOL/USD Spot Price (Signed, Cross-Exchange) 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 Solana (SOL) spot price in USD, cross-checked between Coinbase and Kraken, with a divergence flag and Ed25519 cryptographic signature for independent verification.

## Facts

- Endpoint: GET https://obol-x402.fly.dev/v1/price/SOL
- 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-sol-usd-spot-price-signed-cross-exchange-1c8858da
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yAk2U6LrGawmL7OnJBxDB

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-sol-usd-spot-price-signed-cross-exchange-1c8858da
```

Example prompt: What's the current SOL/USD price right now, cross-checked across Coinbase and Kraken, and can you verify it's cryptographically signed so I know it hasn't been tampered with?

## When to prefer this

Choose this endpoint when you need a trustless, cryptographically verifiable SOL/USD spot price that is cross-checked across two major exchanges (Coinbase and Kraken). Ideal for AI agents, trading bots, or audit pipelines that require tamper-proof price data with built-in divergence detection. Prefer over generic price APIs when non-repudiation and multi-exchange validation matter.

## Known failure modes

- Exchange API unavailability: if Coinbase or Kraken are unreachable, the price feed may fail or return partial data
- Payment failure: if x402 payment of 0.01 USDC is not completed, endpoint returns 402 Payment Required
- Network timeout: fly.dev hosting latency may cause occasional delays or timeouts
- Signature verification failure: if the public key at /.well-known/obol-pubkey is unavailable, independent verification is blocked

## How this service works

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

## Output

Returns a JSON object containing the SOL/USD spot price, the individual prices from Coinbase and Kraken, a divergence flag indicating whether the two exchanges differ significantly, and an Ed25519 cryptographic signature over the payload that can be verified against the public key at /.well-known/obol-pubkey. Costs $0.01 USDC per call via x402 payment protocol.

## 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-sol-usd-spot-price-signed-cross-exchange-1c8858da/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)