Approve Milestone

curl -sS -X POST https://app.opentrain.ai/api/public/v1/milestones/<MILESTONE_ID>/approve \
  -H "Authorization: Bearer $OT_API_TOKEN"

opentrain milestones approve --milestone-id <MILESTONE_ID> --json

{
  "milestoneId": "<MILESTONE_ID>"
}

{
  "approval": {
    "id": "<APPROVAL_ID>",
    "type": "milestone_approve",
    "status": "pending",
    "contractId": "<CONTRACT_ID>",
    "milestoneId": "<MILESTONE_ID>",
    "jobId": "<JOB_ID>",
    "approvalUrl": "https://app.opentrain.ai/approvals/<APPROVAL_ID>",
    "expiresAt": "2026-06-15T10:00:00.000Z",
    "resolvedAt": null,
    "result": null,
    "createdAt": "2026-06-12T10:00:00.000Z"
  },
  "message": "Release request recorded. A signed-in human must confirm this approval in the OpenTrain app before any money moves."
}

{
  "error": "Milestone must be funded before it can be approved for release",
  "code": "CONFLICT",
  "requestId": "<REQUEST_ID>",
  "details": {
    "milestoneId": "<MILESTONE_ID>",
    "status": "NOT_FUNDED",
    "reason": "milestone_not_funded"
  }
}

POST

api

public

milestones

{milestoneId}

approve

curl -sS -X POST https://app.opentrain.ai/api/public/v1/milestones/<MILESTONE_ID>/approve \
  -H "Authorization: Bearer $OT_API_TOKEN"

opentrain milestones approve --milestone-id <MILESTONE_ID> --json

{
  "milestoneId": "<MILESTONE_ID>"
}

{
  "approval": {
    "id": "<APPROVAL_ID>",
    "type": "milestone_approve",
    "status": "pending",
    "contractId": "<CONTRACT_ID>",
    "milestoneId": "<MILESTONE_ID>",
    "jobId": "<JOB_ID>",
    "approvalUrl": "https://app.opentrain.ai/approvals/<APPROVAL_ID>",
    "expiresAt": "2026-06-15T10:00:00.000Z",
    "resolvedAt": null,
    "result": null,
    "createdAt": "2026-06-12T10:00:00.000Z"
  },
  "message": "Release request recorded. A signed-in human must confirm this approval in the OpenTrain app before any money moves."
}

{
  "error": "Milestone must be funded before it can be approved for release",
  "code": "CONFLICT",
  "requestId": "<REQUEST_ID>",
  "details": {
    "milestoneId": "<MILESTONE_ID>",
    "status": "NOT_FUNDED",
    "reason": "milestone_not_funded"
  }
}

Requests payment release for an ACTIVE_FUNDED milestone — typically after the AI trainer has delivered the work. This call never releases money. It records a pending approval (type: "milestone_approve") and returns 202; a signed-in human must open approval.approvalUrl and confirm in the OpenTrain app before the escrowed funds pay out. Approvals expire after ~72 hours. Re-requesting while a pending approval exists returns the same approval (idempotent). Learn the outcome by polling GET /approvals/{id} or watching for the approval.confirmed event on GET /updates. The request has no body. Requirements: payments:write scope + the public_api_payments_write feature + a claimed account (unclaimed accounts get 403 with details.reason: "account_claim_required" and a claimUrl). The milestone must be ACTIVE_FUNDED — fund it first.

Request

string

required

The milestone to release payment for. Must be ACTIVE_FUNDED, not cancelled, on an active contract you own.

Response

Returns 202 — the request is recorded, nothing has been released yet.

object

The pending approval, in the same shape as GET /approvals/{id}:

{id, type: "milestone_approve", status: "pending", contractId, milestoneId, jobId, proposalId: null, approvalUrl, expiresAt, resolvedAt, result, createdAt}

string

Explains that a signed-in human must confirm the approval before any money moves.

Errors

Status	`code`	Meaning
`401`	`UNAUTHORIZED`	Missing or invalid token
`403`	`FORBIDDEN`	Missing `payments:write` scope, `public_api_payments_write` disabled, or account not claimed (`details.reason: "account_claim_required"`, `details.claimUrl`)
`404`	`NOT_FOUND`	No such milestone, or its contract is on another account
`409`	`CONFLICT`	See the reason catalog below

`409` reason catalog

`details.reason`	Meaning	Extra `details` fields
`milestone_not_funded`	Milestone is `NOT_FUNDED` — fund it before requesting release	`status`
`milestone_not_releasable`	Milestone is in some other non-releasable state (e.g. already completed)	`status`
`milestone_cancelled`	Milestone has been cancelled	—
`contract_ended`	The contract has ended	`contractId`

curl -sS -X POST https://app.opentrain.ai/api/public/v1/milestones/<MILESTONE_ID>/approve \
  -H "Authorization: Bearer $OT_API_TOKEN"

opentrain milestones approve --milestone-id <MILESTONE_ID> --json

{
  "milestoneId": "<MILESTONE_ID>"
}

{
  "approval": {
    "id": "<APPROVAL_ID>",
    "type": "milestone_approve",
    "status": "pending",
    "contractId": "<CONTRACT_ID>",
    "milestoneId": "<MILESTONE_ID>",
    "jobId": "<JOB_ID>",
    "approvalUrl": "https://app.opentrain.ai/approvals/<APPROVAL_ID>",
    "expiresAt": "2026-06-15T10:00:00.000Z",
    "resolvedAt": null,
    "result": null,
    "createdAt": "2026-06-12T10:00:00.000Z"
  },
  "message": "Release request recorded. A signed-in human must confirm this approval in the OpenTrain app before any money moves."
}

{
  "error": "Milestone must be funded before it can be approved for release",
  "code": "CONFLICT",
  "requestId": "<REQUEST_ID>",
  "details": {
    "milestoneId": "<MILESTONE_ID>",
    "status": "NOT_FUNDED",
    "reason": "milestone_not_funded"
  }
}

Fund Milestone

Get Approval

⌘I

Getting started

Connect your agent

Core concepts

Guides

API reference

CLI

MCP server

Annotation platforms

Request

Response

Errors

`409` reason catalog

​Request

​Response

​Errors

​409 reason catalog

Request

Response

Errors

`409` reason catalog