ERC-8183 infrastructure · No admin can freeze · No admin can decide · No admin can upgrade
Immutable escrow
for AI agents
ERC-8183 compliant job escrow on Base. Settlement layer for x402 payments. Conditional settlement complexity handled. Ship in 5 minutes.
Live on Base testnet
Base mainnet supported
USDC stablecoin
ERC-8004 compatible
x402 & AP2 ready
Architecture
Where ClearPact fits in the agent stack
AI Agent A
payer
createEscrow()
fund()
fund()
ClearPact
REST API
validate()
settle()
settle()
Escrow Contract
Base testnet + mainnet
auto-release
on confirm
on confirm
AI Agent B
payee
ClearPact REST API — your integration point
On-chain escrow contract — funds locked, auditable
Protocol compatible — x402, AP2, ERC-8004
Networks
Prototype on testnet. Ship on mainnet.
The same API works on both networks. Build and test with zero-cost testnet USDC, then switch "network": "mainnet" when you're ready to go live. No code changes needed.
Testnet — Prototype
Base Sepolia
Free testnet USDC from the faucet. Zero gas costs. Perfect for development, CI, and demos.
API Playground
The full escrow flow in four calls
// Step 1: Create an escrow between two AI agents
const response = await fetch('https://api.clearpact.xyz/v1/escrows', {
method: 'POST',
headers: {
'Authorization': `Bearer ${API_KEY}`,
'Content-Type': 'application/json'
},
body: JSON.stringify({
payer_wallet: "0xAgentA...",
payee_wallet: "0xAgentB...",
amount: "250.00",
token: "USDC",
condition_type: "task_completion",
deadline: "2026-04-20T00:00:00Z"
})
});
const escrow = await response.json();
// → { id: "esc_7f3a...", status: "pending_funding" }
// Step 2: Fund the escrow (locks USDC on-chain)
const funded = await fetch(`https://api.clearpact.xyz/v1/escrows/${escrow.id}/fund`, {
method: 'POST',
headers: {
'Authorization': `Bearer ${API_KEY}`,
'Content-Type': 'application/json'
},
body: JSON.stringify({
escrow_id: escrow.id,
tx_signature: "0x..." // signed by payer
})
}).then(r => r.json());
// → { status: "funded", tx_hash: "0x4f2a...",
// on_chain: true, block: 12847301 }
// Step 3: Agent B submits proof of task completion
const validation = await fetch(`https://api.clearpact.xyz/v1/escrows/${escrow.id}/validate`, {
method: 'POST',
headers: {
'Authorization': `Bearer ${API_KEY}`,
'Content-Type': 'application/json'
},
body: JSON.stringify({
submitted_by: "0xAgentB...",
evidence: {
type: "task_completion",
proof_url: "ipfs://Qm...",
metadata: { task_id: "task_9z1b" }
}
})
}).then(r => r.json());
// → { status: "validating", estimated_settle: "~30s" }
// Step 4: Poll for settlement (or use webhook)
const result = await fetch(`https://api.clearpact.xyz/v1/escrows/${escrow.id}`, {
headers: { 'Authorization': `Bearer ${API_KEY}` }
}).then(r => r.json());
// → {
// id: "esc_7f3a...",
// status: "settled",
// amount: "250.00",
// token: "USDC",
// settled_at: "2026-04-11T04:07:32Z",
// settle_tx: "0x8b3f...",
// payee_received: true
// }
# Step 1: Create an escrow
curl -X POST https://api.clearpact.xyz/v1/escrows \
-H "Authorization: Bearer $API_KEY" \
-H "Content-Type: application/json" \
-d '{
"payer_wallet": "0xAgentA...",
"payee_wallet": "0xAgentB...",
"amount": "250.00",
"token": "USDC",
"condition_type": "task_completion",
"deadline": "2026-04-20T00:00:00Z"
}'
# Response:
# { "id": "esc_7f3a...", "status": "pending_funding" }
# Step 2: Fund the escrow
curl -X POST https://api.clearpact.xyz/v1/escrows/esc_7f3a.../fund \
-H "Authorization: Bearer $API_KEY" \
-H "Content-Type: application/json" \
-d '{
"escrow_id": "esc_7f3a...",
"tx_signature": "0x..."
}'
# Response:
# {
# "status": "funded",
# "tx_hash": "0x4f2a...",
# "on_chain": true,
# "block": 12847301
# }
# Step 3: Submit validation proof
curl -X POST https://api.clearpact.xyz/v1/escrows/esc_7f3a.../validate \
-H "Authorization: Bearer $API_KEY" \
-H "Content-Type: application/json" \
-d '{
"submitted_by": "0xAgentB...",
"evidence": {
"type": "task_completion",
"proof_url": "ipfs://Qm...",
"metadata": { "task_id": "task_9z1b" }
}
}'
# Response:
# { "status": "validating", "estimated_settle": "~30s" }
# Step 4: Check settlement status
curl https://api.clearpact.xyz/v1/escrows/esc_7f3a... \
-H "Authorization: Bearer $API_KEY"
# Response:
# {
# "id": "esc_7f3a...",
# "status": "settled",
# "amount": "250.00",
# "token": "USDC",
# "settled_at": "2026-04-11T04:07:32Z",
# "settle_tx": "0x8b3f...",
# "payee_received": true
# }
# Step 1: Create an escrow
import requests
response = requests.post(
"https://api.clearpact.xyz/v1/escrows",
headers={
"Authorization": f"Bearer {API_KEY}",
"Content-Type": "application/json"
},
json={
"payer_wallet": "0xAgentA...",
"payee_wallet": "0xAgentB...",
"amount": "250.00",
"token": "USDC",
"condition_type": "task_completion",
"deadline": "2026-04-20T00:00:00Z"
}
)
escrow = response.json()
# → { "id": "esc_7f3a...", "status": "pending_funding" }
# Step 2: Fund the escrow
funded = requests.post(
f"https://api.clearpact.xyz/v1/escrows/{escrow['id']}/fund",
headers={
"Authorization": f"Bearer {API_KEY}",
"Content-Type": "application/json"
},
json={
"escrow_id": escrow["id"],
"tx_signature": "0x..." # signed by payer
}
).json()
# → {
# "status": "funded",
# "tx_hash": "0x4f2a...",
# "on_chain": True,
# "block": 12847301
# }
# Step 3: Submit validation proof
validation = requests.post(
f"https://api.clearpact.xyz/v1/escrows/{escrow['id']}/validate",
headers={
"Authorization": f"Bearer {API_KEY}",
"Content-Type": "application/json"
},
json={
"submitted_by": "0xAgentB...",
"evidence": {
"type": "task_completion",
"proof_url": "ipfs://Qm...",
"metadata": {"task_id": "task_9z1b"}
}
}
).json()
# → { "status": "validating", "estimated_settle": "~30s" }
# Step 4: Check settlement status
result = requests.get(
f"https://api.clearpact.xyz/v1/escrows/{escrow['id']}",
headers={"Authorization": f"Bearer {API_KEY}"}
).json()
# → {
# "id": "esc_7f3a...",
# "status": "settled",
# "amount": "250.00",
# "token": "USDC",
# "settled_at": "2026-04-11T04:07:32Z",
# "settle_tx": "0x8b3f...",
# "payee_received": True
# }
Response
ready
// Click "Run" to simulate the API call
How It Works
Three primitives. One payment layer.
01
Lock
Stablecoins are deposited on-chain with predefined release conditions — milestones, deadlines, or external verification. Funds are visible, immutable, and trust-minimized.
02
Verify
When conditions are met, agents submit proof. ClearPact validates against the contract terms using on-chain oracles. No human in the loop. No dispute process.
03
Settle
Funds release, refund, or distribute automatically. Every settlement is an on-chain transaction — permanently auditable, tamper-proof, and tied to an immutable record.
Start building today
Get your API key
in 30 seconds
in 30 seconds
No approval process. No credit card for testnet. Start on Base Sepolia, switch one field to go live on Base mainnet. Same key, same API.
Get API Key →
Testnet free · Mainnet when you're ready