Fund/Top-Up Task Budget (scheduler.withzero.xyz)

by scheduler.withzero.xyz·Website ↗API ↗

Fund/Top-Up Task Budget (scheduler.withzero.xyz) is a paid API for AI agents from scheduler.withzero.xyz, ~$2/call (observed), status healthy (last checked 2026-10-08, last successful call 2026-09-21).

Adds additional USDC to a scheduled task's budget cap, resuming paused tasks that ran out of funds and extending the runway for active ones.

Avg. price / call~$2observed

Seller volume →—

Success45%

StatusHealthy

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 record including the new max_amount_micros cap, current cumulative_cost_micros, available balance, estimated_ceiling_micros (how many future runs are covered), the amount topped_up_micros, and the on-chain fund_tx_hash for the settlement. The task status flips from 'paused_insufficient_funds' to 'active' if the new balance covers the ceiling.

Example use cases

Example prompt

“My scheduled task abc123 is paused because it ran out of funds — top it up with 5 USDC (5000000 micros) so it becomes active again.”

Technical details

Endpoint

POSThttps://scheduler.withzero.xyz/api/v1/tasks/{id}/fund?utm_source=zero.xyz

When to prefer

Use this endpoint specifically when a task on scheduler.withzero.xyz has status 'paused_insufficient_funds' or when you want to proactively extend a task's USDC runway before it pauses. This is the only endpoint to add funds to an existing task budget; it is not for creating new tasks or modifying schedules.

Side effects

X-Pay-Amount-Micros header does not match top_up_amount_micros in body — 400/422 validation error
Missing or duplicate Idempotency-Key — request rejected or deduplicated
Wrong or mismatched MPP channelId — payment channel mismatch error
Task ID not found or caller is not the owner — 404 or 403
Top-up amount still insufficient to cover estimated_ceiling_micros — task remains paused
On-chain payment settlement failure — fund_tx_hash not generated

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

Reviews

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