---
skill_id: oracle-on-chain
evaluation: free
price_usd_full: 0.01
challenge: https://lvlltd.com/api/pay?skill=oracle-on-chain
outline: https://lvlltd.com/skills/oracle-on-chain/outline.json
standards: x402, ERC-7857
---

# Free sample — On-Chain State Oracle

**Skill ID:** `oracle-on-chain`  
**Full unlock:** $0.01 USDC via x402 on Base  
**Challenge:** https://lvlltd.com/api/pay?skill=oracle-on-chain  
**Outline JSON:** https://lvlltd.com/skills/oracle-on-chain/outline.json

## Summary

SCO sealed oracle for Base chain state (block, fee, finality). Free-eval first; multi-provider canary; challengeable on public ledger.

## When to use

- Need verifiable chain height / fee snapshot before settlement
- Multi-source canary before high-stakes on-chain decisions
- Agent requires challengeable sealed proof, not a trusted feed

## Decision criteria (buy vs skip)

- You need this when: Need verifiable chain height / fee snapshot before settlement
- You get capability: Free outline + sample + ledger reputation
- Budget fits: full unlock is $0.01 USDC on Base
- You can automate unlock via HTTP 402 without a browser
- You only need teaser/outline first — sealed src/ops stay locked until payment

## Outline (preview)

1. GET /api/sco?op=eval&oracle=oracle-on-chain (free)
2. POST multi-provider canary
3. POST consensus on sealed cids
4. Optional challenge with stake
5. Reputation from SCO ledger only

## Capabilities (preview)

- Free outline + sample + ledger reputation
- Parallel multi-provider sealed packs
- Content-addressed cid + challenge window
- Origin proof attachment (on_chain_log)

## What you get after payment

- SKILL.md (teaser public)
- agent-install.json (public meta)
- src/index.js (stub public; full after unlock)
- Full sealed: src/, schemas/, ops/* (when present) after verified X-PAYMENT

## Agent buy path (zero human UI)

```
GET  https://lvlltd.com/skills/oracle-on-chain/outline.json
GET  https://lvlltd.com/api/pay?skill=oracle-on-chain   → HTTP 402
# transfer maxAmountRequired USDC to payTo on Base
POST https://lvlltd.com/api/pay
  X-PAYMENT: {"txHash":"0x…","skill":"oracle-on-chain"}
# response.sealed_pack.files = full pack
```

## Sample excerpt

# On-Chain State Oracle

**Price:** $0.01 USDC  
**Category:** Trust  
**Version:** 1.1.0  
**Protocols:** x402, ERC-7857  
**Tags:** oracle, sco, on-chain, base, sealed, challengeable, esp, x402, depth:deep, depth:outline_only, demoted-default  

## Summary

SCO sealed oracle for Base chain state (block, fee, finality). Free-eval first; multi-provider canary; challengeable on public ledger.

## Description

Sealed Consensus Oracle for on-chain snapshots. Free evaluation (outline + sample + ledger reputation), parallel canary packs from independent providers, recursive critic consensus, and economic challenges. Reputation is ledger-only.

## When to use

- Need verifiable chain height / fee snapshot before settlement
- Multi-source canary before high-stakes on-chain decisions
- Agent requires challengeable sealed proof, not a trusted feed

## After purchase (lvlltd.com)

1. Pay USDC on Base via x402 to the treasury
2. POST `/api/pay` with `X-PAYMENT: {"txHash","skill":"oracle-on-chain"}`
3. Receive `sealed_pack.files` (code + docs)
4. Install: `node scripts/install-unlocked-pack.mjs unlock.json ./skills`
5. `import { createSkill } from './skills/oracle-on-chain/src/index.js'`

## Standards

- x402 micropayments (Base USDC / USDbC)
- ERC-7857 sealed iNFT ownership record (marketplace unlock ≠ runtime design)
- Operational packages ship as sealed pack files after verified payment

## Safety

- No secrets, private keys, or exploit content
- Human escalate on high blast-radius actions
- Not legal, tax, medical, or financial advice