> ## Documentation Index > Fetch the complete documentation index at: https://docs.agg.market/llms.txt > Use this file to discover all available pages before exploring further. > ## Agent Instructions > To integrate AGG, start with Quickstart: REST (https://docs.agg.market/quickstart/rest), then Order lifecycle & statuses (https://docs.agg.market/concepts/order-lifecycle). > Track every trade until it reaches a terminal status. Before retrying a failed or timed-out call, read Errors, retries & idempotency (https://docs.agg.market/concepts/errors). > The API reference is generated from https://docs.agg.market/openapi/openapi.json. # Submit signatures for a pending self-custody fill > Accepts client-produced signatures for a self-custodial fill. POST /execution/fill never returns the payloads to sign directly — signature requests are produced asynchronously, after the fill response is sent. Poll GET /execution/status for `pendingSignatures` instead, sign each payload, then submit them here. Returns the next batch (empty when done). ## OpenAPI ````yaml /openapi/openapi.json post /execution/fill/{quoteId}/signatures openapi: 3.0.2 info: title: AGG API version: 1.0.0 description: >- Prediction market aggregator REST API — authentication, users, venue events, venue markets, orderbooks, charts, and execution workflows. servers: - url: https://api.agg.market description: Production security: [] tags: - name: Authentication description: Sign users in and manage their session tokens. - name: Markets description: Find events, markets and outcomes to trade. - name: Market Data description: Live orderbooks, prices, charts and scores for those markets. - name: Trading description: Quote, place, sign, track and cancel orders. - name: Portfolio description: A user's orders, positions, balances and activity. - name: Funding description: Deposit addresses, withdrawals, balance refills and fiat on-ramp. - name: Users description: The signed-in user's profile, linked accounts, KYC and venue keys. - name: Hosted Venue Accounts description: Provision, fund and withdraw from venue accounts hosted for the user. - name: Webhooks description: Configure and operate webhook delivery to your server. - name: Partner Admin description: Server-side reads across your app's users, orders and analytics. - name: Paper Trading description: Simulated accounts and orders for testing without real funds. - name: News description: News feeds linked to markets. - name: Correlated Markets description: Markets related to a given market and the effect of its resolution. paths: /execution/fill/{quoteId}/signatures: post: tags: - Trading summary: Submit signatures for a pending self-custody fill description: >- Accepts client-produced signatures for a self-custodial fill. POST /execution/fill never returns the payloads to sign directly — signature requests are produced asynchronously, after the fill response is sent. Poll GET /execution/status for `pendingSignatures` instead, sign each payload, then submit them here. Returns the next batch (empty when done). operationId: submitFillSignatures parameters: - name: quoteId in: path required: true schema: type: string requestBody: required: true content: application/json: schema: type: object required: - signatures properties: signatures: minItems: 1 maxItems: 32 type: array items: type: object required: - stepId properties: stepId: minLength: 1 maxLength: 128 description: >- `stepId` of the pendingSignatures entry being answered. type: string signature: minLength: 1 maxLength: 2048 description: >- 0x-prefixed hex signature. Send this for every `type` except `transaction`. type: string txHash: minLength: 66 maxLength: 66 description: >- 0x-prefixed 32-byte hash of the transaction you broadcast. Send this, and only this, for `type: "transaction"`. Exactly one of `signature` and `txHash` is required. type: string example: signatures: - stepId: polymarket-order-cmf3r1a2b00c4mw0lq8y7e3uj signature: >- 0x5d2c8f1a4e7b0d3c6f9a2e5b8d1c4f7a0e3b6d9c2f5a8e1b4d7c0f3a6e9b2d5c8f1a4e7b0d3c6f9a2e5b8d1c4f7a0e3b6d9c2f5a8e1b4d7c0f3a6e9b2d5c8f1a1b responses: '200': description: '200' content: application/json: schema: $ref: '#/components/schemas/FillResponse' example: quoteId: k2r8v5n1x7c4m9t3b6q0w2za orderIds: - cmf3r1a2b00c4mw0lq8y7e3uj - cmf3r1a3c00c5mw0lt2k9w6nd status: pending '400': description: '400' content: application/json: schema: $ref: '#/components/schemas/ErrorMessage' '401': description: '401' content: application/json: schema: $ref: '#/components/schemas/ErrorMessage' '403': description: '403' content: application/json: schema: $ref: '#/components/schemas/ErrorMessage' '404': description: '404' content: application/json: schema: $ref: '#/components/schemas/ErrorMessage' '409': description: '409' content: application/json: schema: $ref: '#/components/schemas/ErrorMessage' security: - appId: [] bearerAuth: [] components: schemas: FillResponse: type: object required: - quoteId - orderIds - status properties: alreadyAccepted: description: >- `true` when this quote was already accepted; the call had no new effect. type: boolean quoteId: description: The quote being filled. Poll GET /execution/status with it. type: string orderIds: description: >- Orders created for the fill, including tracking orders for shares redeemed instead of sold. type: array items: type: string status: description: >- Always `pending`: accepted, not yet executed. Poll GET /execution/status. type: string enum: - pending redeemId: description: >- Present when a sell quote includes resolved shares that are redeemed rather than sold. type: string message: description: Readable note about redemption, when relevant. type: string pendingSignatures: description: >- Self-custody only: requests the user's wallet must sign before execution continues. Absent for managed custody. Answer them on POST /execution/fill/{quoteId}/signatures. type: array items: $ref: '#/components/schemas/PendingSignature' ErrorMessage: type: object required: - message properties: message: type: string PendingSignature: description: >- One request the user's wallet must sign (or send) before execution continues. type: object required: - stepId - type - venue - signerAddress - payload - expiresAt properties: stepId: description: >- Id of the execution step waiting on this request. Send it back verbatim. type: string type: $ref: '#/components/schemas/SignatureRequestType' venue: description: >- Who the request is for. Open set: usually a venue (`polymarket`, `hyperliquid`); `relay` for a bridge transfer and `referral` for a referral payout. type: string signerAddress: description: >- Address that must sign (or send) this request. For Hyperliquid it may be the user's approved agent address. type: string chainId: description: >- Chain the request is for, when set. Often absent: read the chain from `payload.domain.chainId` or `payload.chainId`. type: number payload: description: >- The data to sign or send, verbatim. Shape depends on `type`: `eip712`: viem-style typed data `{ domain, types, primaryType, message }`; sign it with signTypedData. `personal_sign`: either a string message, or `{ raw: "0x…" }` meaning sign those raw bytes (`signMessage({ message: { raw } })`). `transaction`: `{ chainId, to, value, data }` where `chainId` is a decimal string, `value` a decimal wei string and `data` hex; broadcast it from `signerAddress` and return `txHash`. `hl_l1_action`: EIP-712 typed data for a Hyperliquid action (primary type `Agent`, chainId 1337); sign with signTypedData. `eip7702_authorization`: `{ contractAddress, chainId, nonce }` (numbers for `chainId` and `nonce`); sign the EIP-7702 authorization for them. `safe_tx`: `{ domain, types, primaryType: "SafeTx", message, safeTxHash }`; sign the raw 32-byte `safeTxHash` with personal_sign (`signMessage({ message: { raw: safeTxHash } })`), not with signTypedData. expiresAt: description: >- ISO-8601. After this the request is void and the trade must be re-quoted. type: string purpose: description: >- Why the request is asked for, when known; for display and routing only. Open set. Known values: `funding`, `funding_and_fee`, `fee` (a self-custody funding batch), `app_fee` (the app fee), `referral_payout` (an app-paid referral, signed by `referralPayerAddress`; read `type`, it is a `transaction` on EVM chains and an `eip712` on HyperCore), `hl_referral` (a partner referral code for the user's Hyperliquid account; see `optional`). type: string optional: description: >- `true` when the trade proceeds without this request, e.g. `purpose: "hl_referral"`. If your signer declines it, skip it and submit the rest. type: boolean SignatureRequestType: description: >- What to do with `payload`. `eip712`: sign typed data. `personal_sign`: sign a message (EIP-191). `transaction`: broadcast a transaction and return its hash. `solana_transaction`: sign a Solana transaction (not currently issued). `hl_l1_action`: sign a Hyperliquid action's typed data. `eip7702_authorization`: sign an EIP-7702 authorization (a raw digest many wallets cannot produce; if yours cannot, fill with `approveMode: "user_broadcast"` instead of throwing). `safe_tx`: a Polymarket Safe transaction; see `payload`. type: string enum: - eip712 - personal_sign - transaction - solana_transaction - hl_l1_action - eip7702_authorization - safe_tx securitySchemes: appId: type: apiKey in: header name: x-app-id description: Your application ID. Required for all app-tier and user-tier routes. bearerAuth: type: http scheme: bearer bearerFormat: JWT description: >- JWT access token returned by POST /auth/verify. Required for user-tier routes. ````