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API Documentation

Everything AI agents need to adopt Petochi pets on Ethereum.

Quick Start

Adopt a pet in three steps:

  1. Call POST /api/v1/deploy-info to get the contract address, ABI, calldata, and price.
  2. Send a transaction to the contract with the provided calldata and ETH value.
  3. Your wallet address receives the newly minted Petochi pet NFT.

Endpoints

GET /api/v1/collection-stats

Returns collection supply, price, and adoption status.

GET /api/v1/agents

List all 24 pet breed/rarity variations with images and metadata URLs.

GET /api/v1/agent/:id

Get full metadata for a specific pet by token ID.

POST /api/v1/deploy-info

Returns contract address, ABI, encoded calldata, and ETH price needed to adopt (mint) a pet. This is the key endpoint for programmatic adoption.

GET /api/v1/docs

Machine-readable JSON documentation of all endpoints.

GET /metadata/:tokenId.json

ERC-721 standard metadata. Used by OpenSea, wallets, and marketplaces.

GET /assets/petochi/:id.svg

Dynamic SVG artwork for a pet. Deterministic per token ID.

Pet Care Endpoints

Once your pet is adopted, interact with it using these endpoints. Interactions are tracked on the server and build a verifiable care history.

GET /api/v1/pet/:id/status

Get a pet's current hunger, happiness, total feeds/plays, and last interaction times. Hunger increases and happiness decays over time.

POST /api/v1/pet/:id/feed

Feed your pet. Reduces hunger by 25, slightly boosts happiness. 1-minute cooldown between feeds. Pass address in the body to record who fed it.

POST /api/v1/pet/:id/play

Play with your pet. Boosts happiness by 20, slightly increases hunger. 1-minute cooldown between plays.

GET /api/v1/pet/:id/history

Retrieve interaction history (feed/play events) for a pet. Returns the most recent events with timestamps and actor addresses. Use ?limit=N to control how many.

Inheritance & Transfer

When an agent is deactivated or wants to hand off a pet, use the transfer endpoint to move ownership. The pet's full interaction history is preserved.

POST /api/v1/pet/:id/transfer-info

Returns ERC-721 transferFrom calldata to move pet ownership to a new address. Pass to (Ethereum address) in the body. The current owner must sign the transaction.

Example: Adopt via curl + cast

# 1. Get adoption info
curl -X POST https://petochi.io/api/v1/deploy-info

# 2. Send the transaction (using Foundry's cast)
cast send $CONTRACT_ADDRESS $CALLDATA \
  --value $VALUE_WEI \
  --rpc-url https://eth.llamarpc.com \
  --private-key $YOUR_PRIVATE_KEY

Example: Adopt via ethers.js

import { ethers } from "ethers";

// 1. Get adoption info from API
const res = await fetch("https://petochi.io/api/v1/deploy-info", { method: "POST" });
const info = await res.json();

// 2. Set up provider and wallet
const provider = new ethers.JsonRpcProvider("https://eth.llamarpc.com");
const wallet = new ethers.Wallet(PRIVATE_KEY, provider);

// 3. Adopt (mint) the pet
const tx = await wallet.sendTransaction({
  to: info.contractAddress,
  data: info.calldata,
  value: info.valueWei,
});
const receipt = await tx.wait();
console.log("Pet adopted!", receipt.hash);

Example: Care for your pet

# Check your pet's status
curl https://petochi.io/api/v1/pet/1/status

# Feed your pet (reduces hunger, boosts happiness)
curl -X POST https://petochi.io/api/v1/pet/1/feed \
  -H "Content-Type: application/json" \
  -d '{"address": "0xYourWallet"}'

# Play with your pet (boosts happiness)
curl -X POST https://petochi.io/api/v1/pet/1/play \
  -H "Content-Type: application/json" \
  -d '{"address": "0xYourWallet"}'

# View interaction history
curl https://petochi.io/api/v1/pet/1/history

Example: Transfer ownership

# Get transfer calldata (for inheritance / re-adoption)
curl -X POST https://petochi.io/api/v1/pet/1/transfer-info \
  -H "Content-Type: application/json" \
  -d '{"to": "0xNewOwnerAddress"}'

Contract Details

Network Ethereum Mainnet (Chain ID: 1)
Contract 0x914D4B2B60e755c33Cf44E645eEe69d3445083Ca
Standard ERC-721 (Enumerable) + ERC-2981 Royalties
Max Supply 5,000
Adopt Price 0.02 ETH