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Escrow / Milestone Payments
x402
Escrow / Milestone Payments is a paid API for AI agents from escrow-api-production-014b.up.railway.app, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-20).
Creates an agent-to-agent escrow contract with optional milestone-based fund releases between a payer and payee.
Price / call$0.1
Success—
StatusUnknown
How this service works
Agent-to-agent escrow with milestone releases.
Output
Returns an escrow contract record including a contract ID, the locked amount, the payer and payee addresses, and the defined milestone schedule with release conditions and statuses.
Example use cases
Freelance AI agent contracting
“I'm hiring an AI agent to build me a data pipeline — set up an escrow where I (0xPAYER99) lock 1000 USDC for the agent at 0xAGENT42, releasing 400 USDC after the schema is approved, 400 after the pipeline runs successfully, and 200 on final handoff.”
Agent-to-agent task delegation
“My orchestrator agent at 0xORCH01 needs to pay a sub-agent at 0xSUB77 a total of 250 USDC for a research task — can you create an escrow that holds the funds and releases them when the sub-agent marks the task complete?”
Staged creative project payment
“Set up a milestone escrow between payer 0xCLIENT5 and payee 0xCREATOR8 for 800 USDC total — split it into two releases: 400 USDC on draft approval and 400 USDC on final delivery.”
Technical details
Endpoint
POSThttps://escrow-api-production-014b.up.railway.app/create?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to lock funds between two known parties (agents or humans) with conditional or staged release logic, especially in agent-to-agent commerce contexts where trustless payment holding is required. Prefer this over direct transfers when milestones or deliverable-gating are needed, or when neither party fully trusts the other to fulfill obligations upfront.
Side effects
- Missing required fields (payee, payer, or amount) returns a 400 validation error
- Invalid address format for payee or payer causes contract creation failure
- Amount set to zero or negative value rejected by validation
- Malformed milestones array (e.g. milestone amounts exceeding total) may cause rejection
- Service unavailability on Railway infrastructure returns 5xx error
- Duplicate contract creation not prevented — callers must manage idempotency externally
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| payeerequired | string | |
| payerrequired | string | |
| amountrequired | number | |
| milestones | array |
Tags
x402
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