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StableUpload File Upload Slot
x402
StableUpload File Upload Slot is a paid API for AI agents from stableupload.dev, paid per call via x402, $2/call, status unknown (last checked 2026-09-14).
Purchases a file upload slot and returns a pre-signed URL that the agent can use to upload a file for hosting
Price / call$2
Success—
StatusUnknown
How this service works
Buy an upload slot. Agent uploads file via returned URL.
Output
Returns a pre-signed upload URL that the agent uses to PUT the actual file bytes, along with an upload ID for tracking the upload and later retrieving metadata or activating the file as a site.
Example use cases
Example prompt
“Upload this file to StableUpload and give me the hosted URL — it's a PDF report I need to share online.”
Technical details
Endpoint
POSThttps://stableupload.dev/api/uploadWhen to prefer
Use this endpoint when you need to upload a single arbitrary file (not specifically a zip site) to get a hosted URL. Choose this over the Site endpoint when you are not deploying a zip-based static site but simply need file storage with a public URL. Ideal for agents that need to host documents, images, or other assets with a 6-month TTL without deploying a full website.
Side effects
- Payment failure — insufficient USDC balance or x402 payment not accepted
- Upload URL expired — pre-signed URL has a TTL and must be used promptly
- File too large — exceeds allowed size for the upload slot
- Authentication error — wallet not recognized or signature invalid
- Server error — 5xx response indicating temporary unavailability
Input
{
"tier": "short-10mb",
"filename": "test-document.pdf",
"contentType": "application/pdf",
"policyTtlSeconds": 3600
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| tier | string | Upload tier. Default 6-month tiers: 10mb ($0.02), 100mb ($0.20), 1gb ($2.00). Short-term 7-day workflow tiers: short-10mb ($0.005), short-100mb ($0.02), short-1gb ($0.10), short-5gb ($0.50, file uploads only). |
| filename | string | Name of the file to upload |
| contentType | string | MIME type of the file (e.g. image/png, video/mp4) |
| policyTtlSeconds | integer | Optional upload URL/form expiration in seconds, 60-86400. Use longer TTLs only when reserving an output slot for a downstream service. |
Output
{
"maxSize": 10485760,
"postUrl": "https://x402-upload-prod.s3.us-east-1.amazonaws.com/",
"uploadId": "sys358mcgn",
"expiresAt": "2026-06-05T23:07:08.792Z",
"publicUrl": "https://f.stableupload.dev/sys358mcgn/test-document.pdf",
"uploadUrl": "https://x402-upload-prod.s3.us-east-1.amazonaws.com/",
"postFields": {
"key": "uploads/sys358mcgn/test-document.pdf",
"policy": "eyJleHBpcmF0aW9uIjoiMjAyNi0wNS0zMFQwMDowNzowOC44NDZaIiwiY29uZGl0aW9ucyI6W3siYnVja2V0IjoieDQwMi11cGxvYWQtcHJvZCJ9LHsia2V5IjoidXBsb2Fkcy9zeXMzNThtY2duL3Rlc3QtZG9jdW1lbnQucGRmIn0seyJDb250ZW50LVR5cGUiOiJhcHBsaWNhdGlvbi9wZGYifSx7IngtYW16LWFsZ29yaXRobSI6IkFXUzQtSE1BQy1TSEEyNTYifSx7IngtYW16LWNyZWRlbnRpYWwiOiJBS0lBMkFVT083QlJERFFQV0RFVi8yMDI2MDUyOS91cy1lYXN0LTEvczMvYXdzNF9yZXF1ZXN0In0seyJ4LWFtei1kYXRlIjoiMjAyNjA1MjlUMjMwNzA4WiJ9LFsiY29udGVudC1sZW5ndGgtcmFuZ2UiLDAsMTA0ODU3NjBdXX0=",
"x-amz-date": "20260529T230708Z",
"Content-Type": "application/pdf",
"x-amz-algorithm": "AWS4-HMAC-SHA256",
"x-amz-signature": "2c73cba6b96558c5c4aed60bfb81fbb20bfb25f9f79c1517b5bc6a939b8652d3",
"x-amz-credential": "AKIA2AUOO7BRDDQPWDEV/20260529/us-east-1/s3/aws4_request"
},
"curlExample": "curl -X POST \"https://x402-upload-prod.s3.us-east-1.amazonaws.com/\" -F 'key=uploads/sys358mcgn/test-document.pdf' -F 'Content-Type=application/pdf' -F 'x-amz-algorithm=AWS4-HMAC-SHA256' -F 'x-amz-credential=AKIA2AUOO7BRDDQPWDEV/20260529/us-east-1/s3/aws4_request' -F 'x-amz-date=20260529T230708Z' -F 'policy=eyJleHBpcmF0aW9uIjoiMjAyNi0wNS0zMFQwMDowNzowOC44NDZaIiwiY29uZGl0aW9ucyI6W3siYnVja2V0IjoieDQwMi11cGxvYWQtcHJvZCJ9LHsia2V5IjoidXBsb2Fkcy9zeXMzNThtY2duL3Rlc3QtZG9jdW1lbnQucGRmIn0seyJDb250ZW50LVR5cGUiOiJhcHBsaWNhdGlvbi9wZGYifSx7IngtYW16LWFsZ29yaXRobSI6IkFXUzQtSE1BQy1TSEEyNTYifSx7IngtYW16LWNyZWRlbnRpYWwiOiJBS0lBMkFVT083QlJERFFQV0RFVi8yMDI2MDUyOS91cy1lYXN0LTEvczMvYXdzNF9yZXF1ZXN0In0seyJ4LWFtei1kYXRlIjoiMjAyNjA1MjlUMjMwNzA4WiJ9LFsiY29udGVudC1sZW5ndGgtcmFuZ2UiLDAsMTA0ODU3NjBdXX0=' -F 'x-amz-signature=2c73cba6b96558c5c4aed60bfb81fbb20bfb25f9f79c1517b5bc6a939b8652d3' -F 'file=@test-document.pdf;type=application/pdf'",
"uploadMethod": "post",
"uploadUrlExpiresAt": "2026-05-30T00:07:08.846Z"
}Schema · Response
{
"type": "json",
"example": {
"maxSize": 10485760,
"postUrl": "https://stableupload-prod.s3.us-east-1.amazonaws.com/",
"uploadId": "2s42wjsk3a",
"expiresAt": "2026-05-02T16:00:00.000Z",
"publicUrl": "https://f.stableupload.dev/2s42wjsk3a/quick-note.txt",
"uploadUrl": "https://stableupload-prod.s3.us-east-1.amazonaws.com/",
"postFields": {
"key": "uploads/2s42wjsk3a/quick-note.txt",
"policy": "base64-policy",
"x-amz-date": "20260425T160000Z",
"Content-Type": "text/plain",
"x-amz-algorithm": "AWS4-HMAC-SHA256",
"x-amz-signature": "hex-signature",
"x-amz-credential": "AKIAEXAMPLE/20260425/us-east-1/s3/aws4_request"
},
"curlExample": "curl -X POST \"https://stableupload-prod.s3.us-east-1.amazonaws.com/\" -F \"key=uploads/2s42wjsk3a/quick-note.txt\" -F \"Content-Type=text/plain\" -F \"x-amz-algorithm=AWS4-HMAC-SHA256\" -F \"x-amz-credential=AKIAEXAMPLE/20260425/us-east-1/s3/aws4_request\" -F \"x-amz-date=20260425T160000Z\" -F \"policy=base64-policy\" -F \"x-amz-signature=hex-signature\" -F \"file=@quick-note.txt;type=text/plain\"",
"uploadMethod": "post",
"uploadUrlExpiresAt": "2026-04-25T16:15:00.000Z"
}
}Tags
x402
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