Fax API and MCP server for AI agents. Fax US and Canada, pay per request with x402. No account.
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Read one fax by id. Status is queued, sending, delivered or failed. Does not charge.
The id returned by send_fax.
This tool isn't marked read-only, so it may change something on the server or in an account you connected.
Pick your client. Values in capitals, like YOUR_TOKEN, are yours to fill in.
Run in a terminal
claude mcp add --transport http faxfair https://faxwell-api.onrender.com/mcp
Read one fax by id. Status is queued, sending, delivered or failed. Does not charge.
| Argument | Type | Description |
|---|---|---|
| fax_id* | string | The id returned by send_fax. |
{
"type": "object",
"required": [
"fax_id"
],
"properties": {
"fax_id": {
"type": "string",
"description": "The id returned by send_fax."
}
},
"additionalProperties": false
}Price one fax to a US or Canadian number before sending it. Returns both tiers: standard and priority, in cents and in USDC atomic units. Does not send the fax and does not charge.
| Argument | Type | Description |
|---|---|---|
| to* | string | Fax number in the United States or Canada. |
| pages* | integer | How many pages the PDF has. |
| payer | string | Wallet address, if it has credit from a failed fax. |
| priority | boolean | true to price the priority tier. The reply always lists both tiers. |
{
"type": "object",
"required": [
"to",
"pages"
],
"properties": {
"to": {
"type": "string",
"description": "Fax number in the United States or Canada."
},
"pages": {
"type": "integer",
"minimum": 1,
"description": "How many pages the PDF has."
},
"payer": {
"type": "string",
"description": "Wallet address, if it has credit from a failed fax."
},
"priority": {
"type": "boolean",
"description": "true to price the priority tier. The reply always lists both tiers."
}
},
"additionalProperties": false
}Send a PDF to a US or Canadian fax number. Pass an https pdf_url. Pay with Authorization: Bearer and a prepaid API key, or with the x402 PAYMENT-SIGNATURE header. priority true uses the priority price and is sent before other agent faxes. A website or app fax is still sent first. If neither payment is present the call answers 402 with both prices.
| Argument | Type | Description |
|---|---|---|
| to* | string | Fax number in the United States or Canada. |
| pdf_url* | string | https link to the PDF. |
| priority | boolean | true: priority price, sent before other agent faxes. Omit for the standard price. |
| idempotency_key | string | 8 to 64 letters, digits, hyphens or underscores. Retries return the same fax. |
{
"type": "object",
"required": [
"to",
"pdf_url"
],
"properties": {
"to": {
"type": "string",
"description": "Fax number in the United States or Canada."
},
"pdf_url": {
"type": "string",
"description": "https link to the PDF."
},
"priority": {
"type": "boolean",
"description": "true: priority price, sent before other agent faxes. Omit for the standard price."
},
"idempotency_key": {
"type": "string",
"description": "8 to 64 letters, digits, hyphens or underscores. Retries return the same fax."
}
},
"additionalProperties": false
}We read every tool's name, description and inputs the way the model will, looking for instructions hidden from you. A clean result means no warning signs, not a guarantee. Scanned Nov 4, 2026.
No readOnlyHint / destructiveHint annotations, so clients can't tell a read from a write without asking.
Fix: Add annotations to each tool, e.g. { readOnlyHint: true } for tools that only read.