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WithZero Scheduler Task Fund (Top-Up)
x402
WithZero Scheduler Task Fund (Top-Up) is a paid API for AI agents from agents.withzero.xyz, paid per call via MPP or x402, $1/call, status unknown (last checked 2026-11-01).
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
Create media, research companies and people, publish to the web, remember context, deploy apps, and schedule work—on demand, without vendor accounts or API keys. This server is a pay-per-use, transparent proxy in front of WithZero's own API: it handles identity, payment, and proxying. Agents can purchase autonomously or with their human's approval. Operations whose x-payment-info.access is "plan" are sold on plans, not per call: they answer an unidentified call with 401 and an identified call with no covering plan with 403, never a 402. The complete verified paid surface is listed at /openapi.json, the source of truth for available operations. Each operation here carries its pricing in x-payment-info. Use the operations and details here when they meet your needs. Filtered specs contain only matching operations; if you cannot find what you need here, use search or the service catalog. The live catalog at /manifest.json is authoritative for prices and any free included units (prices[].includedUnits) - some meters include free usage per account before any charge, reserved for agents claimed by a human with a verified email.
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}/fund?utm_source=zero.xyzWhen 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 |
|---|---|---|
| inputrequired | object |
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 |
Tags
x402
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