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WithZero Scheduler Task Fund (Top-Up)
WithZero Scheduler Task Fund (Top-Up) is a paid API for AI agents from agents.withzero.xyz, paid per call via MPP, $1/call, status unknown (last checked 2026-09-11).
Increases the maximum USDC budget for an existing scheduled task by adding funds to its escrow or raising its execution cap.
Price / call$1session · ~$1 to open
Success—
StatusUnknown
How this service works
Increase max_amount_micros. Direct endpoint: X-Pay-Amount-Micros must match top_up_amount_micros and the settled payment extends refundable escrow; no Idempotency-Key header required because replay protection is payment-bound. ZeroClick endpoint: the amount only raises the seller-local lifetime execution cap; marketplace usage remains authoritative and no seller escrow moves. 📖 Full guide: https://scheduler.withzero.xyz/llms.txt
Output
Returns the updated task object including: new max_amount_micros (raised cap), current status (may flip from paused_insufficient_funds to active), balance_available_micros, topped_up_micros, estimated_ceiling_micros (projected runs remaining), billing_rail (direct or zeroclick), and fund_tx_hash (on-chain channel ID for direct rail, null for zeroclick).
Example use cases
Resume paused task with fresh funds
“My recurring research task (ID: e3f7a1b2-...) paused because it hit its budget limit — please add 10 USDC to it so it resumes automatically.”
Add runway before funds run out
“I want to top up my scheduled data-publishing task by 3 USDC while it still has some balance, so it doesn't pause mid-cycle.”
Extend execution cap for high-frequency task
“My agent task is running more often than expected — can you add 20 USDC worth of runway to task ID 9d4c2e88-... so it doesn't get blocked?”
Technical details
Endpoint
POSThttps://agents.withzero.xyz/api/v1/scheduler/tasks/{id}/fundWhen to prefer
Use this endpoint when an existing WithZero scheduled task has paused due to insufficient funds (status: paused_insufficient_funds) or when you want to proactively add USDC runway before the task's balance is exhausted. This is the only endpoint for increasing a task's budget cap after creation — use the task-create endpoint if starting fresh. On the direct rail, funds move into on-chain refundable escrow; on the zeroclick rail, only the local execution cap is raised.
Side effects
- 400 PRICE_RESOLVER_FAILED — X-Pay-Amount-Micros header missing, non-integer, or does not exactly match top_up_amount_micros body field
- 404 — task ID not found or caller does not own the task
- 402 — payment challenge not settled; funds not transferred
- 422 — top_up_amount_micros is zero or negative (pattern requires non-zero positive integer string)
- 503 — upstream payment rail or escrow service temporarily unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| top_up_amount_microsrequired | string | Additional USDC to add to the task, in micros (1 USDC = 1_000_000 micros; string or number up to 2^53-1). Bumped onto max_amount_micros. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| idrequired | string | |
| statusrequired | string | New status — flips from 'paused_insufficient_funds' to 'active' if the top-up covers the ceiling. |
| billing_railrequired | string | |
| fund_tx_hashrequired | — | Direct rail: on-chain channel id. ZeroClick rail: null because no seller escrow moved. |
| topped_up_microsrequired | string | |
| max_amount_microsrequired | string | New cap after the top-up. |
| cumulative_cost_microsrequired | string | |
| balance_available_microsrequired | string | |
| estimated_ceiling_microsrequired | string |
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