# SYNTHORA Resolution Oracle

> SYNTHORA Resolution Oracle is a paid API for AI agents from resolution-oracle.hergertsynthora.com, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-14).

Returns probabilistic resolution assessments and risk scoring for a given query or question, with Ed25519-signed results, paid per-call via x402 USDC on Base

## Facts

- Endpoint: POST https://resolution-oracle.hergertsynthora.com/service
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synthora-resolution-oracle-24f846e9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pll7_5LbWCdYNJwIx00vm

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 synthora-resolution-oracle-24f846e9 -d '<json body>'
```

Example prompt: What's the probability that 'Will Ethereum ETF net inflows exceed $1B in Q3 2025?' resolves Yes, and what's the resolution risk level?

## When to prefer this

Choose this endpoint when an autonomous agent needs a cryptographically signed, pay-per-call probabilistic resolution assessment with no API key or signup required. It is ideal for prediction market platforms, decision-gating workflows, or any agent that needs tamper-evident risk scoring settled on-chain. Prefer it over traditional forecasting APIs when trustless authentication via USDC payment and Ed25519-signed responses are required.

## Known failure modes

- HTTP 402 with no payment header — expected first step, requires re-POST with X-PAYMENT header
- Invalid or expired EIP-3009 authorization — payment rejected, result not returned
- Malformed query/question fields — may return error or empty result
- Insufficient USDC balance on Base mainnet — payment fails
- Endpoint unavailable or service outage — connection error or 5xx response

## How this service works

Pay-per-call data and safety intelligence for autonomous agents. Every endpoint is protected by HTTP 402 (x402), settled in USDC on Base mainnet (eip155:8453). No API key, no signup, no KYC: the payment IS the authentication. Responses are Ed25519-signed.

Flow: (1) POST the endpoint with no payment header, (2) receive HTTP 402 with an `accepts` array describing price and payTo, (3) re-POST with the `X-PAYMENT` header carrying an EIP-3009 transferWithAuthorization, (4) receive the signed result.

This document describes the canonical request/response contract. The full live catalogue of 222 payable resources is published at https://pay.hergertsynthora.com/.well-known/x402.json

## Output

A JSON object containing: a boolean ok status, the niche identifier ('resolution_oracle'), a SYNTHORA Ed25519 signature with SHA256 hash for result integrity, a probability object with Yes/No probabilities, a resolution risk assessment with a level (e.g. 'bajo'/'low'), and an echo of the input consulta/query.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "query": {
   "type": "string"
  },
  "question": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "niche": "resolution_oracle",
  "result": {
   "sello": {
    "firma": "SYNTHORA",
    "sha256": "..."
   },
   "informe": {
    "probabilidades": {
     "Yes": 0.5
    },
    "riesgo_resolucion": {
     "nivel": "bajo"
    }
   },
   "consulta": "..."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synthora-resolution-oracle-24f846e9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from resolution-oracle.hergertsynthora.com](https://www.zero.xyz/host/resolution-oracle.hergertsynthora.com/llms.txt)