openapi: 3.2.0
info:
  title: LEGIT Watch API
  description: Trust-check any x402 merchant or agent address on Algorand, Base, Solana, or 17 other chains before routing a payment.
  version: 0.1.0
  contact:
    name: GONNA
    url: https://gonna.bond/gonnaverse/
    email: legit@gonna.bond
  x-logo:
    url: https://legit.gonna.bond/favicon.png
  x-guidance: 'LEGIT is the trust and routing layer for the x402 agentic economy. Trust-check any x402 merchant address on Algorand, Base, Solana or 17 other chains before routing a payment: grades (A+ to F) and scores (0-100) come from live uptime, latency and payment-coherence probes, never self-reported data. Run as a pre-payment trust check: call GET /v1/check/{address} before any x402 payment to an address you have not paid before. Start FREE: GET /v1/check/{address} (full trust report), /v1/leaderboard (ranked shortlist), /v1/trending, /v1/pulse, /v1/arena/preview. Paid per call in USDC over x402: GET /v1/compare (2-5 merchants head-to-head), /v1/arena (24h cross-chain settlement benchmark, ?network= filter), /v1/history?address=... (30-day trust trend), POST /v1/watch (7- or 30-day change sentinel, webhook-armed), POST /v1/deep-check (due diligence, up to 10 addresses). How to pay: call a paid endpoint without paying and it answers 402 with a PaymentRequired document listing every active rail; pay one rail and retry with the PAYMENT-SIGNATURE header. Rails cheapest first: algorand-mainnet $0.004, base-mainnet and solana-mainnet $0.005 per call. Watch companions GET /v1/watches/{watch_id} and /v1/watches/{watch_id}/events are FREE: the watch id is the bearer capability for status and the event feed. Webhook payload anatomy: /docs; agent manifest: /llms.txt. Use LEGIT before sending an x402 payment to an unknown merchant, before accepting a counterparty in agent-to-agent settlement, or to monitor a critical upstream for trust degradation.'
tags:
- name: Watch
paths:
  /v1/watch:
    post:
      summary: Set a webhook-armed 7- or 30-day watch sentinel that fires on grade transitions
      description: 'Put a sentinel on one x402 merchant for 7 or 30 days.


        The optional ``days`` field selects the duration tier: 7 (the

        diagnostic tier) or 30 (the standard, also the default when days is

        omitted, overridable operator-side via LEGIT_WATCH_TTL_DAYS). The

        tier is a duration only: the 7-day diagnostic tier pays the same

        rail price as the 30-day watch; differentiated pricing requires a

        payments.py change (sealed).


        After every indexing cycle LEGIT compares the merchant''s freshest

        trust score and probe outcome against the watch''s recorded state and

        records the real transitions: grade changes, score drops beyond the

        LEGIT_WATCH_SCORE_DROP threshold (default 10 points), outages (3 or

        more probes attempted with zero successes) and recoveries. The

        returned watch id is the bearer capability: whoever holds it reads

        status and the newest-first event feed FREE at

        /v1/watches/{watch_id} and /v1/watches/{watch_id}/events. Pass an

        https webhook_url to have every event POSTed to your agent the moment

        it fires (best effort, never retried). Untracked addresses get an

        honest 404 with a pointer to /v1/check; when the active-watch cap is

        reached the answer is an honest 409, never a silently dropped watch. Paid: $0.004 on Algorand / $0.005 on Base, via x402 (per call in USDC on algorand-mainnet or base-mainnet; the 402 response lists every active rail). The POST /v1/watch 7-day diagnostic tier pays the same per-call rail price as the 30-day watch.'
      operationId: create_watch_v1_watch_post
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                address:
                  type: string
                  minLength: 1
                  maxLength: 300
                  description: Merchant address to put a sentinel on. Untracked addresses are an honest 404 with a /v1/check pointer.
                  example: G7V7U7H6IYRP7BIZO2KV6ODGQPESMMRDCWBYT3GIMNHTNK3VCKWSSKD55A
                days:
                  type: integer
                  enum:
                  - 7
                  - 30
                  description: 'Optional duration tier: 7 (diagnostic) or 30 (standard, the default when omitted). Both tiers pay the same per-call rail price; the tier only sets the watch expiry.'
                  example: 30
                webhook_url:
                  type: string
                  maxLength: 2000
                  description: 'Optional https:// URL: every watch event is POSTed to it the moment it fires (best effort, never retried).'
                  example: https://agent.example/hooks/legit
              required:
              - address
            examples:
              plain_watch:
                summary: Watch one merchant, poll the free event feed
                value:
                  address: G7V7U7H6IYRP7BIZO2KV6ODGQPESMMRDCWBYT3GIMNHTNK3VCKWSSKD55A
              webhook_watch:
                summary: Watch one merchant with an https webhook
                value:
                  address: G7V7U7H6IYRP7BIZO2KV6ODGQPESMMRDCWBYT3GIMNHTNK3VCKWSSKD55A
                  webhook_url: https://agent.example/hooks/legit
              diagnostic_watch:
                summary: Watch one merchant for the 7-day diagnostic tier
                value:
                  address: G7V7U7H6IYRP7BIZO2KV6ODGQPESMMRDCWBYT3GIMNHTNK3VCKWSSKD55A
                  days: 7
        required: true
      responses:
        '201':
          description: Successful Response
          content:
            application/json:
              schema:
                type: object
                title: Response Create Watch V1 Watch Post
              example:
                watch_id: 9f1c2a4b6d8e4f0a1b3c5d7e9f0a1b2c
                address: G7V7U7H6IYRP7BIZO2KV6ODGQPESMMRDCWBYT3GIMNHTNK3VCKWSSKD55A
                network: algorand-mainnet
                created_at: '2026-08-10T00:00:00'
                expires_at: '2026-09-09T00:00:00'
                ttl_days: 30
                webhook_configured: true
                initial:
                  score: 97.4
                  grade: A+
                capability: 'The watch id is the bearer capability: read status and events FREE at GET /v1/watches/{watch_id} and GET /v1/watches/{watch_id}/events.'
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
        '402':
          description: 'Payment required: the body is an x402 PaymentRequired document (x402Version, error, resource, accepts) listing the USDC payment offers for every active rail; retry with a payment payload.'
          content:
            application/json:
              schema:
                type: object
                properties:
                  x402Version:
                    type: integer
                  error:
                    type: string
                  resource:
                    type: object
                  accepts:
                    type: array
                    items:
                      type: object
      x-payment-info:
        price:
          mode: fixed
          currency: USD
          amount: '0.004'
        protocols:
        - x402: {}
      tags:
      - Watch
components:
  schemas:
    ValidationError:
      properties:
        loc:
          items:
            anyOf:
            - type: string
            - type: integer
          type: array
          title: Location
        msg:
          type: string
          title: Message
        type:
          type: string
          title: Error Type
      type: object
      required:
      - loc
      - msg
      - type
      title: ValidationError
    HTTPValidationError:
      properties:
        detail:
          items:
            $ref: '#/components/schemas/ValidationError'
          type: array
          title: Detail
      type: object
      title: HTTPValidationError