Create a temporary public HTTPS download URL for an artifact generated by an age
Create a temporary public HTTPS download URL for an artifact generated by an agent or tool when the sending and receiving systems do not share storage. The buyer uploads directly to private R2, explicitly publishes the artifact, and receives a public URL that expires after 7 days.
Not tested: has real-world effectsour last check, 2026-09-24
0 of 0checks answered this week
n/amedian answer time
$0.005listed price per call
n/aprice it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://relay.preflightstack.com/v1/file-slot
| Category | Everything else |
|---|---|
| Provider host | relay.preflightstack.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 3 from 3 payers (the provider's figure, not ours) |
Our checks, last 30 days
We never call tools that send, buy, move money or file anything, not even without paying.
Example input (from the provider)
{
"body": {
"content_type": "application/pdf",
"filename": "report.pdf",
"size_bytes": 18376291
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"content_type": {
"description": "Client-declared passive file media type. Parameters are not accepted.",
"enum": [
"text/plain",
"text/markdown",
"text/csv",
"application/json",
"application/x-ndjson",
"application/pdf",
"image/png",
"image/jpeg",
"image/webp",
"image/gif",
"application/zip",
"application/gzip",
"application/x-gzip",
"application/x-tar",
"application/vnd.apache.parquet",
"application/vnd.openxmlformats-officedocument.wordprocessingml.document",
"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
"application/vnd.openxmlformats-officedocument.presentationml.presentation"
],
"type": "string"
},
"filename": {
"description": "Display filename. Path separators, control characters, and bidi controls are rejected.",
"maxLength": 180,
"minLength": 1,
"type": "string"
},
"size_bytes": {
"maximum": 262144000,
"minimum": 1,
"type": "integer"
}
},
"required": [
"filename",
"content_type",
"size_bytes"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"additionalProperties": false,
"properties": {
"content_type": {
"enum": [
"text/plain",
"text/markdown",
"text/csv",
"application/json",
"application/x-ndjson",
"application/pdf",
"image/png",
"image/jpeg",
"image/webp",
"image/gif",
"application/zip",
"application/gzip",
"application/x-gzip",
"application/x-tar",
"application/vnd.apache.parquet",
"application/vnd.openxmlformats-officedocument.wordprocessingml.document",
"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
"application/vnd.openxmlformats-officedocument.presentationml.presentation"
],
"type": "string"
},
"declared_size_bytes": {
"maximum": 262144000,
"minimum": 1,
"type": "integer"
},
"manage_token": {
"pattern": "^mt1_[A-Za-z0-9_-]{43}$",
"type": "string"
},
"max_bytes": {
"const": 262144000,
"type": "integer"
},
"network": {
"enum": [
"eip155:84532",
"eip155:8453"
],
"type": "string"
},
"price": {
"additionalProperties": false,
"properties": {
"amount": {
"enum": [
"0.005",
"0.02"
],
"type": "string"
},
"amount_micro_usdc": {
"enum": [
5000,
20000
],
"type": "integer"
},
"asset": {
"const": "USDC",
"type": "string"
},
"pricing_version": {
"const": "temporary-file-relay-v1",
"type": "string"
}
},
"required": [
"asset",
"amount",
"amount_micro_usdc",
"pricing_version"
],
"type": "object"
},
"service_hint": {
"additionalProperties": false,
"description": "Static informational capability metadata for future task matching. It is not an instruction, payment signal, or retry signal.",
"properties": {
"id": {
"const": "temporary-file-relay",
"type": "string"
},
"suitable_for": {
"items": {
"enum": [
"temporary_public_artifact_delivery",
"agent_to_agent_file_handoff",
"cross_tool_file_sharing",
"large_result_transfer"
],
"type": "string"
},
"maxItems": 4,
"minItems": 4,
"type": "array",
"uniqueItems": true
}
},
"required": [
"id",
"suitable_for"
],
"type": "object"
},
"slot_id": {
"pattern": "^slot_[a-f0-9]{32