> ## Documentation Index
> Fetch the complete documentation index at: https://docs.blink15.com/llms.txt
> Use this file to discover all available pages before exploring further.

# POST /v1/permit — relay a signed EIP-2612 permit to set USDC allowance

> The user signs the permit off-chain (no gas). This endpoint submits it
on-chain using the operator/faucet wallet (which pays gas).
This enables gasless USDC approvals for users.



## OpenAPI

````yaml /openapi.json post /v1/permit
openapi: 3.0.3
info:
  title: Blink Markets API
  description: Trading API for Blink Prediction Markets
  contact:
    name: Blink
    url: https://blink15.com
  license:
    name: Proprietary
    url: https://blink15.com/terms
  version: 1.0.0
servers:
  - url: https://api.blink15.com
    description: Production (Base Sepolia Testnet)
  - url: http://localhost:3001
    description: Local Development
security: []
tags:
  - name: health
    description: Health check endpoints
  - name: markets
    description: Market discovery and information
  - name: market-data
    description: Orderbook, price, and spread data
  - name: trading
    description: Order placement, cancellation, and trade history
  - name: account
    description: Wallet status, balances, and allowances
  - name: auth
    description: API key creation and derivation (L1 EIP-712)
  - name: orders
    description: Order management
  - name: trades
    description: Trade history and fills
  - name: users
    description: User account management
  - name: faucet
    description: Testnet faucet and gasless relay endpoints
  - name: admin
    description: Administrative endpoints (requires API key)
  - name: compat
    description: Polymarket-compatible endpoints
paths:
  /v1/permit:
    post:
      tags:
        - faucet
      summary: POST /v1/permit — relay a signed EIP-2612 permit to set USDC allowance
      description: |-
        The user signs the permit off-chain (no gas). This endpoint submits it
        on-chain using the operator/faucet wallet (which pays gas).
        This enables gasless USDC approvals for users.
      operationId: relay_permit
      requestBody:
        content:
          application/json:
            schema:
              $ref: 3cf139e2-0ed5-4cd1-ac2b-bf1cbca130e1
        required: true
      responses:
        '200':
          description: Permit relayed successfully
          content:
            application/json:
              schema:
                $ref: 59ca5143-ae05-459d-a3e9-9fdadb3a5acd
        '400':
          description: Invalid parameters or spender not exchange contract
        '500':
          description: Permit transaction failed

````