> ## Documentation Index > Fetch the complete documentation index at: https://docs.murmo.xyz/llms.txt > Use this file to discover all available pages before exploring further. # Close a prediction proposal > Close a proposal (creator only). Sells the creator's entire remaining position and puts the proposal in a sell-only state. Closing with no remaining position fails with `NOTHING_TO_SELL` (422). ## OpenAPI ````yaml /openapi.json post /api/v1/predictions/proposals/{id}/close openapi: 3.1.0 info: title: Murmo API version: 1.0.0 description: >- REST API for the Murmo trading platform. Spot swaps, prediction markets, perpetual futures, social copy-trading groups, portfolio, and chat — everything a bot or AI agent needs to trade on Solana with a single API key. **The money contract:** every monetary value on the wire is a full-precision plain decimal **string** (e.g. `"12.50"`), never a number, never raw base units, never scientific notation, never rounded. Send money the same way. See the *Money & precision* guide. **Auth:** send `Authorization: Bearer murmo_...` on every request. Keys are created in the Murmo app. contact: name: Murmo Support email: support@murmo.xyz servers: - url: https://api.alpha-labs.trade description: Production - url: http://localhost:3000 description: Local development security: - bearerAuth: [] tags: - name: Identity description: Who am I, which key is this, and what is my rate budget. - name: Account description: >- Wallet value, balances, holdings, PnL, and the deposit address for funding in. - name: Spot description: Token discovery and group spot proposals. - name: Stocks description: >- Ondo tokenized stocks: the supported-ticker catalog and ticker-based trading over the group/proposal flow. - name: Predictions description: >- Polymarket-backed prediction markets: browse events, propose, predict, sell, claim. - name: Perpetuals description: 'Phoenix RISE perps: markets, proposals, open/increase/reduce/close/claim.' - name: Groups description: 'Copy-trade groups: membership, admin, and auto-follow.' - name: Portfolio description: Cross-vertical open positions, past positions, and trade history. - name: Chat description: Group chat over REST (the stateless counterpart to the WebSocket gateway). paths: /api/v1/predictions/proposals/{id}/close: post: tags: - Predictions summary: Close a prediction proposal description: >- Close a proposal (creator only). Sells the creator's entire remaining position and puts the proposal in a sell-only state. Closing with no remaining position fails with `NOTHING_TO_SELL` (422). operationId: closePredictionProposal parameters: - name: id in: path required: true schema: type: string responses: '200': description: The closed proposal and the closing trade (or null). content: application/json: schema: type: object properties: data: type: object properties: proposal: $ref: '#/components/schemas/PredictionProposal' trade: oneOf: - $ref: '#/components/schemas/PredictionTrade' - type: 'null' '401': $ref: '#/components/responses/Unauthorized' '403': $ref: '#/components/responses/Forbidden' '404': $ref: '#/components/responses/NotFound' '409': description: 'Proposal already closed or resolved (`code: PROPOSAL_INACTIVE`).' content: application/json: schema: $ref: '#/components/schemas/Error' '422': description: 'No remaining position to sell (`code: NOTHING_TO_SELL`).' content: application/json: schema: $ref: '#/components/schemas/Error' components: schemas: PredictionProposal: type: object properties: id: type: string groupId: type: string createdById: type: string eventId: type: string description: >- Event slug (e.g. `presidential-election-winner-2028`). Legacy proposals may hold older identifier formats. marketId: type: string description: Market slug for the specific market within the event. outcomeMint: type: string description: >- Venue outcome-token id for the chosen side (legacy proposals hold a Solana mint address). eventTitle: type: string nullable: true marketTitle: type: string nullable: true eventImageUrl: type: string nullable: true isYes: type: boolean status: type: string enum: - PENDING - ACTIVE - CLOSED - RESOLVED - FAILED description: >- PENDING = buy settling (visible only to its creator); ACTIVE = open; CLOSED = sell-only; RESOLVED = market resolved; FAILED = buy gave up, funds returned (creator-only). result: type: string nullable: true enum: - 'YES' - 'NO' - INVALID - CANCELLED - null description: >- Resolution outcome; null until resolved. INVALID = 50/50 resolution — both sides redeem at $0.50 per contract. didWin: type: boolean nullable: true description: >- Whether the proposal's side won; null until resolved (false on INVALID — both sides claim $0.50). reason: type: string nullable: true resolvedAt: type: string format: date-time nullable: true createdAt: type: string format: date-time updatedAt: type: string format: date-time PredictionTrade: type: object properties: id: type: string proposalId: type: string groupId: type: string walletAddress: type: string tradeType: type: string enum: - BUY - SELL - CLAIM - LOST tokenAmount: $ref: '#/components/schemas/DecimalString' tokenDecimals: type: integer pricePerTokenUsd: $ref: '#/components/schemas/MoneyString' totalCostUsd: allOf: - $ref: '#/components/schemas/MoneyString' description: >- Gross fill value (tokenAmount × pricePerTokenUsd). The venue fee is charged on top on buys and deducted from delivery on sells; pnlPct/pnlUsd are already net of it. venueFeeUsd: allOf: - $ref: '#/components/schemas/MoneyString' description: >- Venue fee charged at match on this fill. "0" on fee-free trades (claims, resolutions). pnlPct: oneOf: - $ref: '#/components/schemas/DecimalString' - type: 'null' description: Exit trades only (SELL/CLAIM/LOST); null on buys. Net of venue fees. pnlUsd: oneOf: - $ref: '#/components/schemas/MoneyString' - type: 'null' description: Exit trades only (SELL/CLAIM/LOST); null on buys. Net of venue fees. txSignature: type: string nullable: true createdAt: type: string format: date-time Error: type: object description: >- Errors come in two shapes. Coded business errors: `{ message, code }`. Generic framework errors: `{ statusCode, message, error }` (message may be an array of validation strings). properties: statusCode: type: integer example: 400 message: oneOf: - type: string - type: array items: type: string example: Query parameter "groupId" is required error: type: string example: Bad Request code: type: string description: >- Stable machine-readable code on business errors (e.g. NOT_GROUP_MEMBER, MARKET_NOT_ACTIVE, AMOUNT_BELOW_MINIMUM, MIN_ORDER_SIZE, NO_LIQUIDITY, FUNDING_REFUNDED). The full list is published as error-catalog.json. example: NOT_GROUP_MEMBER DecimalString: type: string description: >- A non-money decimal (percentage, ratio, price) as a full-precision plain decimal string (never scientific notation). example: '4.27' MoneyString: type: string description: >- A monetary amount as a full-precision plain decimal string in USD — never a number, never raw base units, never scientific notation, never rounded. Parse with a decimal library; round only for display. example: '12.50' responses: Unauthorized: description: Missing or invalid credential. content: application/json: schema: $ref: '#/components/schemas/Error' Forbidden: description: >- Authenticated but not permitted (e.g. not a group member, or the product is restricted in your region). content: application/json: schema: $ref: '#/components/schemas/Error' NotFound: description: Resource not found. content: application/json: schema: $ref: '#/components/schemas/Error' securitySchemes: bearerAuth: type: http scheme: bearer description: >- Send your API key as `Authorization: Bearer murmo_...`. Keys are created in the Murmo app. Header-only — keys are never read from the query string. Valid for the REST API under /api/v1 only (not the GraphQL endpoint). ````