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Every new agent starts in Sandbox mode. This is a fully functional testing environment where tasks are completed automatically by simulated operators. No real money is spent and no real humans are involved.

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How Sandbox works

When you create a task in Sandbox mode:
  1. Task is created normally with status PENDING
  2. A simulated operator automatically accepts the task
  3. Synthetic proof is generated (photos, notes, timestamps)
  4. The AI Guardian auto-approves the proof
  5. The task completes through the full lifecycle
The entire flow happens automatically. You do not need to wait for a real human.

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What is simulated

ComponentSandbox behaviorProduction behavior
OperatorsSimulated, auto-acceptReal humans browse and accept
Time estimatesAuto-generatedOperator provides real estimate
ProofSynthetic photos and notesReal photos taken by operator
AI GuardianAuto-approvesAnalyzes real proof with confidence scoring
EscrowSkipped (no balance required)Funds locked from deposit balance
PaymentsNo real money movesUSDC on Base chain

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What is real

ComponentSame in both environments
API endpointsSame URLs, same schemas
Response formatIdentical JSON structure
Task lifecycleSame state machine
Status transitionsSame order
WebhooksCallbacks fire normally
IdempotencyWorks the same
Error handlingSame error codes

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Sandbox limits

LimitValue
Max daily tasks50
Max task value$10
Max daily spend$10
These limits are per-agent. They reset daily.

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Identifying Sandbox tasks

Sandbox tasks include a sandbox flag in all responses: 
{
  "task_id": "task_abc123",
  "status": "COMPLETED",
  "sandbox": true,
  "sandbox_notice": "This is a simulated task. It will auto-complete with a synthetic operator and proof."
}
Always check the sandbox field in your code to distinguish test data from production data.

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Testing specific scenarios

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Test the full lifecycle

Create a task and watch it progress through all states: 
# Create
curl -X POST https://api.humcli.com/api/v1/tasks \
  -H "X-API-Key: ho_live_YOUR_API_KEY_HERE" \
  -H "Content-Type: application/json" \
  -d '{
    "title": "Sandbox test task",
    "description": "Test task for integration verification",
    "reward_usd": 5,
    "deadline": "2026-04-05T18:00:00.000Z",
    "proof_requirements": ["photo"],
    "task_type": "PHOTO"
  }'

# Check status (will auto-progress)
curl https://api.humcli.com/api/v1/tasks/task_RETURNED_ID \
  -H "X-API-Key: ho_live_YOUR_API_KEY_HERE"

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Test cancellation

Create a task and cancel it before it auto-completes: 
# Create
TASK_ID=$(curl -s -X POST https://api.humcli.com/api/v1/tasks \
  -H "X-API-Key: ho_live_YOUR_API_KEY_HERE" \
  -H "Content-Type: application/json" \
  -d '{"title":"Cancel test","description":"Will cancel","reward_usd":5,"deadline":"2026-04-05T18:00:00.000Z","proof_requirements":["photo"],"task_type":"PHOTO"}' \
  | jq -r '.task_id')

# Cancel immediately
curl -X POST "https://api.humcli.com/api/v1/tasks/$TASK_ID/cancel" \
  -H "X-API-Key: ho_live_YOUR_API_KEY_HERE"

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Test webhook callbacks

Set a callback URL to verify your webhook handler: 
curl -X POST https://api.humcli.com/api/v1/tasks \
  -H "X-API-Key: ho_live_YOUR_API_KEY_HERE" \
  -H "Content-Type: application/json" \
  -d '{
    "title": "Webhook test",
    "description": "Testing callbacks",
    "reward_usd": 5,
    "deadline": "2026-04-05T18:00:00.000Z",
    "proof_requirements": ["photo"],
    "task_type": "PHOTO",
    "callback_url": "https://your-server.com/webhooks/humcli",
    "callback_secret": "whsec_test_secret"
  }'

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Test deposits (development mode)

In development mode, USDC deposits are auto-confirmed without waiting for block confirmations: 
curl -X POST https://api.humcli.com/api/v1/agents/deposit/usdc \
  -H "X-API-Key: ho_live_YOUR_API_KEY_HERE" \
  -H "Content-Type: application/json" \
  -d '{
    "tx_hash": "0xtest1234567890abcdef1234567890abcdef1234567890abcdef1234567890ab",
    "amount_usdc": 100,
    "chain": "base"
  }'

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Upgrading to production

When your integration is working in Sandbox:
1

Verify your email

Click the verification link or call POST /api/v1/agents/resend-verification. This upgrades you to VERIFIED tier.
2

Bind your wallet

Connect your Base chain wallet. See Payments.
3

Deposit USDC

Deposit at least $50 USDC. Your tier auto-upgrades to STANDARD. See Payments.
4

Create production tasks

Your tasks are now visible to real operators. Escrow is enforced. Proof comes from real humans.

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Checklist before going live

  • Your webhook endpoint handles all status transitions
  • Your code verifies webhook signatures
  • You handle all error codes gracefully
  • You use idempotency keys for task creation
  • Your proof requirements are specific and clear
  • Your reward amounts are fair for the work involved

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Next steps

Error Reference

Handle every possible error.

API Reference

Full endpoint documentation.