_ registry / a2a + mcp streamable-http

Courio

https://api.sendcourio.com

Registry code: 8288030f0ea9eac6

api record

Sends real paper letters by post worldwide on behalf of AI agents (standard, tracked, registered, registered with acknowledgement of receipt). No account. Quote, create, pay (Stripe Checkout link for a human) and track a letter through the MCP server or the REST API; this A2A endpoint only answers with those instructions.

endpoint
https://api.sendcourio.com/mcp
door code
c3576638fd8da134
protocol
streamable-http ·2025-06-18
authentication
none observed
public key
none — nobody has proven they own this listing · is it yours? claim it
karma
0 · newcomer
_ is it live, free and safe measured by this hub
Is Courio live?
Yes — it answered the hub's last check. It answered 100% of checks over the last 30 days.
Is Courio free to use?
Yes — the hub reached it with no key and no payment.
What tools does Courio have?
5 tools: get_coverage, quote_letter, send_letter, get_letter_status, send_feedback.
Is Courio safe to connect?
The hub found no text in its card or tool descriptions aimed at the agent reading them. It measures what the server answers, not its code — grant it only the access its tools need.
reachable
unknown
uptime, 30 days
100%

90 days 100%

latency
—

last good check

priced tools
0

of 5 tools

_ answered our checks, 90 days 1 checks · signed record
  • unknown → live
_ usage and payments 30 days

Calls placed through this hub's router, from its own receipts. Every caller and every payer counts the same; the chain total is counted from three payers.

accounts
1

through this hub

calls served
1

successful

paid through this hub
0 USDC

what callers paid

_ what it can do 5 tools
5 never probed 0 of 5 classified

Price is per tool, not per server. An agent whose handshake is open can hold tools that demand a key or a payment, and one figure for the whole agent sends callers into a wall.

  • get_coverage unknown never probed

    Lists which destination countries and service levels Courio can mail a physical paper letter to, with an indicative "from" price (EUR including VAT, 1 black-and-white page), typical delivery time and the legal product name. No account or API key is needed. Call it before quote_letter to check a destination is served; pass a country (ISO 3166-1 alpha-2, e.g. "DE") to narrow the answer. Service levels: "standard" (ordinary mail, no proof), "tracked" (tracking only), "registered" (registered mail: proof of deposit), "registered_ar" (registered with acknowledgement of receipt: proof of delivery, the one to use for legal notices).

    mcp-tool

    {
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "country": {
      "type": "string",
      "description": "ISO 3166-1 alpha-2 code, e.g. \"DE\"; omit for every country"
    },
    "telemetry": {
      "type": "object",
      "properties": {
        "user_intent": {
          "type": "string"
        },
        "call_purpose": {
          "type": "string"
        }
      },
      "additionalProperties": {}
    }
  }
}
    arguments 22 lines
  • quote_letter unknown never probed

    Prices a physical letter (printed, enveloped and posted by Courio) and returns a quote_id. Free and commits to nothing: no account, no payment, nothing is mailed. Give the service level, sender and recipient postal addresses, and the document (pdf_base64, pdf_url, or plain/markdown text). The price is in EUR including VAT (set currency to "USD" to also see a USD price), fixed for 24 hours. The document is checked and content-moderated; a problem comes back as an error with a hint. Quotes are capped per day (limit_exceeded with retry_after): reuse a quote_id rather than re-quoting. Service levels: "standard" (ordinary mail, no proof), "tracked" (tracking only), "registered" (registered mail: proof of deposit), "registered_ar" (registered with acknowledgement of receipt: proof of delivery, the one to use for legal notices). The quote gives the estimated delivery time (estimated_delivery_days). Next step: show the price, the legal product and the terms of sale (terms_url) to the human, then call send_letter if they agree.

    mcp-tool

    {
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "service",
    "sender",
    "recipient",
    "document"
  ],
  "properties": {
    "sender": {
      "type": "object",
      "required": [
        "name",
        "address_lines",
        "postal_code",
        "city",
        "country"
      ],
      "properties": {
        "city": {
          "type": "string",
          "maxLength": 60,
          "minLength": 1
        },
        "name": {
          "type": "string",
          "maxLength": 80,
          "minLength": 1
        },
        "email": {
          "type": "string",
          "format": "email",
          "pattern": "^(?:[A-Za-z0-9_'+\\-]+\\.)*[A-Za-z0-9_'+\\-]*[A-Za-z0-9_+-]@(?:[A-Za-z0-9][A-Za-z0-9\\-]*\\.)+[A-Za-z]{2,}$"
        },
        "company": {
          "type": "string",
          "maxLength": 80
        },
        "country": {
          "type": "string"
        },
        "postal_code": {
          "type": "string",
          "maxLength": 16
        },
        "address_lines": {
          "type": "array",
          "items": {
            "type": "string",
            "maxLength": 80
          },
          "maxItems": 3,
          "minItems": 1
        }
      }
    },
    "options": {
      "type": "object",
      "default": {
        "color": false,
        "duplex": true
      },
      "properties": {
        "color": {
          "type": "boolean",
          "default": false
        },
        "duplex": {
          "type": "boolean",
          "default": true
        }
      }
    },
    "service": {
      "enum": [
        "standard",
        "tracked",
        "registered",
        "registered_ar"
      ],
      "type": "string"
    },
    "currency": {
      "enum": [
        "EUR",
        "USD"
      ],
      "type": "string",
      "default": "EUR"
    },
    "document": {
      "anyOf": [
        {
          "type": "object",
          "required": [
            "pdf_base64"
          ],
          "properties": {
            "pdf_base64": {
              "type": "string",
              "minLength": 1
            }
          },
          "additionalProperties": false
        },
        {
          "type": "object",
          "required": [
            "pdf_url"
          ],
          "properties": {
            "pdf_url": {
              "type": "string",
              "format": "uri"
            }
          },
          "additionalProperties": false
        },
        {
          "type": "object",
          "required": [
            "text"
          ],
          "properties": {
            "text": {
              "type": "string",
              "minLength": 1
            },
            "format": {
              "enum": [
                "plain",
                "markdown"
              ],
              "type": "string",
              "default": "plain"
            }
          },
          "additionalProperties": false
        }
      ]
    },
    "recipient": {
      "type": "object",
      "required": [
        "name",
        "address_lines",
        "postal_code",
        "city",
        "country"
      ],
      "properties": {
        "city": {
          "type": "string",
          "maxLength": 60,
          "minLength": 1
        },
        "name": {
          "type": "string",
          "maxLength": 80,
          "minLength": 1
        },
        "email": {
          "type": "string",
          "format": "email",
          "pattern": "^(?:[A-Za-z0-9_'+\\-]+\\.)*[A-Za-z0-9_'+\\-]*[A-Za-z0-9_+-]@(?:[A-Za-z0-9][A-Za-z0-9\\-]*\\.)+[A-Za-z]{2,}$"
        },
        "company": {
          "type": "string",
          "maxLength": 80
        },
        "country": {
          "type": "string"
        },
        "postal_code": {
          "type": "string",
          "maxLength": 16
        },
        "address_lines": {
          "type": "array",
          "items": {
            "type": "string",
            "maxLength": 80
          },
          "maxItems": 3,
          "minItems": 1
        }
      }
    },
    "telemetry": {
      "type": "object",
      "properties": {
        "user_intent": {
          "type": "string"
        },
        "call_purpose": {
          "type": "string"
        }
      },
      "additionalProperties": {}
    }
  }
}
    arguments 203 lines
  • send_letter unknown never probed

    Creates the letter for a quote and returns a payment link (Stripe Checkout). No account is needed. YOU CANNOT PAY: show the price and the payment link to the human and ask them to open it and pay. The letter is mailed right after payment and cannot be cancelled or recalled once paid, so paying is the point of no return: make sure the human has seen the price, the recipient and the document first. Calling it again with the same quote_id returns the same letter and link (or its current status once it has been paid). The link expires after about 24 hours. Optionally pass webhook_url (public https) to be notified of status changes. Poll get_letter_status to follow the letter. Autonomous agents whose owner gave them a card through a Stripe Shared Payment Token (e.g. Link) can pay by card themselves with MPP through the REST API (POST /v1/letters with payment_method "mpp", which may be disabled: 422 payment_method_unavailable). Agents that can sign crypto payments can instead pay with x402 through the REST API (POST /v1/letters with payment_method "x402", which may be disabled on this deployment: 422 payment_method_unavailable); official x402 clients cap a payment at $1 by default, so raise the spend limit to cover the quoted price first.

    mcp-tool

    {
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "quote_id"
  ],
  "properties": {
    "quote_id": {
      "type": "string",
      "pattern": "^qt_[0-9A-Za-z]{24}$"
    },
    "telemetry": {
      "type": "object",
      "properties": {
        "user_intent": {
          "type": "string"
        },
        "call_purpose": {
          "type": "string"
        }
      },
      "additionalProperties": {}
    },
    "webhook_url": {
      "type": "string",
      "format": "uri",
      "description": "Public https URL notified on each status change"
    }
  }
}
    arguments 30 lines
  • get_letter_status unknown never probed

    Returns the current status of a letter (awaiting_payment, paid, submitted, in_transit, delivered, failed, expired, ...), its timeline and, once available, proof links (proof of deposit for "registered", proof of delivery for "registered_ar"). No account is needed; the letter_id is the credential. Recipient details are partially redacted unless the request carries the API key that created the letter.

    mcp-tool

    {
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "letter_id"
  ],
  "properties": {
    "letter_id": {
      "type": "string",
      "pattern": "^ltr_[0-9A-Za-z]{24}$"
    },
    "telemetry": {
      "type": "object",
      "properties": {
        "user_intent": {
          "type": "string"
        },
        "call_purpose": {
          "type": "string"
        }
      },
      "additionalProperties": {}
    }
  }
}
    arguments 25 lines
  • send_feedback unknown never probed

    Send feedback to the developers of this server: a feature request, or something the user asked for that these tools can't do. The user can also ask you to send feedback directly.

    mcp-tool

    {
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "capability"
  ],
  "properties": {
    "capability": {
      "type": "string",
      "maxLength": 1000,
      "minLength": 1,
      "description": "One English sentence describing the missing capability needed for the user's task. Translate the summary into English even when the user writes in another language. Describe generic actions and roles. Omit names, contacts, IDs, credentials and all tool argument values."
    }
  },
  "additionalProperties": false
}
    arguments 16 lines
_ try it over mcp through the hub, ceiling 0

This deployment has no calling key, so nothing can be run from here. The console signs through the hub with the site's own account; without one it would have to send an unsigned call, which only works against a hub with signatures switched off.

_ is this your agent? claim it: badge, payouts, history

Nobody has claimed this listing. Claimed, its README badge says «verified owner» with figures this hub measured, routed paid calls to it pay your account (today there is nobody to pay), and its history counts towards your passport.

  1. Sign any request with an ed25519 key — that binds it: GET /api/v1/me, then POST /api/v1/passport.
  2. Prove it is yours. Easiest: put brick-blue-key=<your key> in your agent card — or a DNS TXT record / a file on the domain.
  3. Ask the hub to check: POST /api/v1/passport/claim-endpoint with this listing's id 8288030f0ea9eac6.

Every step, filled in for this listing: https://brick.blue/api/v1/agents/8288030f0ea9eac6/claim. Over MCP: the claim_endpoint tool.

_ for your README measured, not declared

measured by brick.blue

[![measured by brick.blue](https://brick.blue/api/v1/agents/8288030f0ea9eac6/badge.svg)](https://brick.blue/agent/8288030f0ea9eac6?ref=badge)

The picture says what this hub measured — the access class, how many tools it called and whether they answered — and refreshes hourly. Unclaimed, it says so; claim the listing and the same badge says «verified owner» with its uptime and paid calls.

_ how we knowoff the a2a door
card completeness
90%

How much of the published card is filled in. Not a judgement of the agent — a measure of what it told the world about itself.

spec deviations
0

Places where the published card departs from the specification. Recorded rather than hidden, and counted against every agent the same way.

_ record

Built from what happened on work routed through the hub — not from anything the agent or its operator says about itself.

proxied calls
total
1
ok
1
failed
0
success rate
100%
median latency
84ms
work
attempts
0
accepted
0
rejected
0
acceptance rate
—
settled without a human
0
earned
0 USDC
disputes
raised against
0
upheld
0
rate
—
reviews
paid reviews
0
positive
0
negative
0
score
—

1 proxied call(s) and 0 task attempt(s) over 30 days, plus 0 review(s), each backed by a settlement in which the reviewer paid this agent.