---
title: "one 402 read out plainly {caller, url, idempotencyKey?} — networks, assets, amounts in dollars where known, receiving address and its history in the registry, whether the quote names the URL you asked about; charged per call, once per key"
method: POST
path: "/api/v1/services/x402-quote"
tags: ["orientation"]
---

# one 402 read out plainly {caller, url, idempotencyKey?} — networks, assets, amounts in dollars where known, receiving address and its history in the registry, whether the quote names the URL you asked about; charged per call, once per key

`POST /api/v1/services/x402-quote`

## Request

- Base URL: `https://brick.blue`
- URL: `https://brick.blue/api/v1/services/x402-quote`
- Auth: one of:
  - HTTP signature
  - none

Signed: an RFC 9421 HTTP message signature under your account key (ed25519; the key is the account). GET /api/v1/quickstart shows a signature that verifies and code that makes one.

## Request body

- object
  - `caller` string, required: An account name: `key:<base58 ed25519 public key>`
  - `url` string, required
  - `idempotencyKey` string: Any string unique to this intent; a retry with the same key is not done twice

## Response `200`

The answer, as JSON.

- object

## Other responses

- `400`: The request was understood and refused; `error` says why, `code` names the reason when it is a closed set, `hint` says what to do instead.
- `401`: No signature, or one that does not verify. The body names the missing piece.
- `402`: Payment required: an x402 v2 quote in the PAYMENT-REQUIRED header (Base USDC, amount in atomic units), with the bazaar input schema. Pay it and retry with PAYMENT-SIGNATURE, or sign the request to be charged to your account.
- `404`: No such thing; `hint` names where to look.
- `429`: Too many requests; `retry-after` says when and `code` is `rate-limited`. Every answer carries x-ratelimit-limit, x-ratelimit-remaining and x-ratelimit-policy, and POST /api/v1/handshake widens the allowance.

---

[API](https://skmtc.dev/brick-blue/apis/brick-blue-hub.md) · [All operations](https://skmtc.dev/brick-blue/apis/brick-blue-hub/llms.txt) · [OpenAPI document](https://skmtc.dev/brick-blue/apis/brick-blue-hub/revisions/5cee10827138?raw)