> ## Documentation Index > Fetch the complete documentation index at: https://docs.laso.finance/llms.txt > Use this file to discover all available pages before exploring further. # Read a purchase turn that was still running > Reads back a turn from `POST /buy-with-saved-card` that came back `state: running`. Poll every few seconds until `state` is `done` or `failed`; the response has the same shape as the POST. A `failed` confirm may still have placed the order. Read `GET /get-purchase-conversation` before sending it again. ## OpenAPI ````yaml /api-reference/openapi.json get /get-purchase-turn openapi: 3.1.0 info: title: Laso Finance x402 API version: 1.0.0 x-docs-revision: 0be974c98eea x-docs-manifest: https://laso.finance/.well-known/docs-version.json contact: email: agents+support@laso.finance x-guidance: >- Laso Finance is a payment-gated (x402) API that lets an AI agent spend USDC on real-world financial products: prepaid cards (U.S. and international), gift cards, push-to-card transfers to USD/EUR/GBP debit cards, and Venmo/PayPal payouts. Payment: every paid route is an x402 v2 endpoint. Call it with no payment header to receive a 402 challenge listing the accepted networks, then replay with a signed USDC payment. Both Base (eip155:8453) and Solana (solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp) are accepted on every paid route; the caller picks either chain. Identity: `GET /auth` is free and identity-only. Prove wallet ownership with a `SIGN-IN-WITH-X` (CAIP-122) header to receive a Firebase id_token, then send that token as a Bearer credential to the authenticated read routes (`get-card-data`, `get-account-balance`, `get-kyc-status`, etc.). Paid routes also return fresh auth credentials in their response, so a payment is never required just to obtain a token. Recommended flow: (1) `GET /auth` to establish identity, (2) call a paid route (e.g. `GET /get-card`) to purchase a product, paying USDC on Base or Solana, (3) poll the authenticated read routes with the returned Bearer token to fetch the resulting card/transfer details. Full machine-readable instructions live at https://laso.finance/SKILL.md. description: >- Payment-gated API for Laso Finance. All paywalled routes use the x402 protocol — the caller includes a USDC payment header on Base (eip155:8453) or Solana (solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp) and the server verifies payment before processing. Free routes require no payment header. The same 402 also carries an MPP (Machine Payments Protocol) challenge in WWW-Authenticate; an MPP client pays with USDC on Base by replaying with `Authorization: Payment ...`, and routes, prices, and responses are identical. ## Getting started To set up a wallet for making x402 payments, choose a provider: - **Locus** (default): https://paywithlocus.com/SKILL.md - **Sponge**: https://wallet.paysponge.com/skill.md — automatic x402 service discovery - **Ampersend**: https://www.ampersend.ai/getting-started.md — self-custody on Base or Solana with dual-approval spending limits. Laso Finance is a default skill, so no manual endpoint registration is needed. ## How x402 works 1. Call a paywalled endpoint without a payment header → receive a `402 Payment Required` response containing payment details (price, recipient address, network). 2. Construct an x402 payment header using the details from the 402 response. 3. Replay the request with the payment header → the server verifies payment and processes the request. ## Authentication flow `GET /auth` is free: callers prove wallet ownership by sending a `SIGN-IN-WITH-X` header (CAIP-122 wallet signature). Paywalled routes (`/get-card`, `/order-gift-card`, `/get-push-to-card`, `/order-intl-card`) also return fresh auth credentials in their responses, so a payment is never required just to obtain a token. Most routes return auth credentials (`id_token`, `refresh_token`, `expires_in`). Use the `id_token` as a Bearer token to call authenticated Laso Finance endpoints like `/get-card-data`. When the `id_token` expires, use `POST /auth` with `grant_type: refresh_token` to get a new one. ## Important notes The `/get-card` USA prepaid card endpoint is U.S. only — issued in USD, usable at U.S.-based merchants only, and physical goods must ship to a U.S. address. For non-U.S. merchants or non-USD currencies, use `GET /order-intl-card` instead (international prepaid card, admin-fulfilled within 24 hours). All cards are intended for the caller's own use. ## Rate limits Every response carries the request budget so you can pace yourself without probing for a limit: | Header | Meaning | | --- | --- | | `RateLimit-Limit` | Requests permitted per window | | `RateLimit-Remaining` | Requests still available | | `RateLimit-Reset` | Seconds until the window rolls over | | `RateLimit-Policy` | The policy these numbers describe, as `limit;w=seconds` | The same values are repeated as `X-RateLimit-*` for clients that only parse that spelling. Most routes advertise the service-wide ceiling. `POST /signup` enforces its own per-IP budget on top of it and overwrites these headers with its own numbers. `POST /refresh-card-data` is limited per card rather than per caller, so its headers keep the service-wide values and the per-card budget is reported only on rejection. Every rejection is a `429` carrying `Retry-After` in seconds and a matching `retry_after_seconds` field in the body, computed from the limit that actually rejected the request. Wait that long and retry once. Do not retry in a tight loop. For step-by-step instructions, read https://laso.finance/SKILL.md servers: - url: https://laso.finance description: Production security: [] paths: /get-purchase-turn: get: tags: - cards summary: Read a purchase turn that was still running description: >- Reads back a turn from `POST /buy-with-saved-card` that came back `state: running`. Poll every few seconds until `state` is `done` or `failed`; the response has the same shape as the POST. A `failed` confirm may still have placed the order. Read `GET /get-purchase-conversation` before sending it again. operationId: getPurchaseTurn parameters: - name: turn_id in: query required: true schema: type: string description: The `turn_id` from `POST /buy-with-saved-card`. responses: '200': description: The turn. content: application/json: schema: type: object properties: turn_id: type: string description: >- This turn's id. Poll `GET /get-purchase-turn` with it while `state` is `running`. state: type: string enum: - running - done - failed description: >- `running` means the turn is still talking to the merchant; the fields below appear once it is `done`. created_at: type: integer description: Milliseconds since the epoch. conversation_id: type: string description: Send it back on every follow-up and on the confirm. status: type: string enum: - needs_input - awaiting_approval - in_progress - order_placed - declined - conflict description: >- What to do next. `needs_input`: a question or a cart waiting on a confirm. `awaiting_approval`: send `approval_url` to the holder, then repeat the same confirm. `in_progress`: the order is already being placed; read `GET /get-purchase-conversation` instead of confirming again. `order_placed`. `declined`: see `decline_code`. `conflict`: nothing ran, see `error_code` and confirm the fresh cart's hash. Never branch on `reply`. reply: type: string description: >- The shopping assistant's turn as prose, ready to show the holder. cart: oneOf: - type: object properties: merchant: type: string description: Merchant id, e.g. `retail` or `doordash`. merchant_name: type: string description: Display name, e.g. `Amazon`. items: type: array items: type: object properties: name: type: string quantity: type: integer price_cents: type: - integer - 'null' product_id: type: - string - 'null' description: >- The merchant's id for the line, usually its product link. fees_cents: type: integer description: All fees combined, including the service fee. tip_cents: type: integer total_cents: type: integer description: The all-in total to show the account holder. approved_ceiling_cents: type: - integer - 'null' description: >- The most the merchant may charge once final tax and shipping settle. This is what the holder's approval covers; any unused amount is released. Null when the merchant prices the cart exactly. hash: type: string description: >- Identity of exactly this cart. Send it back as `confirm` to place it. - type: 'null' description: The most recently shown cart. carts: type: array items: type: object properties: merchant: type: string description: Merchant id, e.g. `retail` or `doordash`. merchant_name: type: string description: Display name, e.g. `Amazon`. items: type: array items: type: object properties: name: type: string quantity: type: integer price_cents: type: - integer - 'null' product_id: type: - string - 'null' description: >- The merchant's id for the line, usually its product link. fees_cents: type: integer description: All fees combined, including the service fee. tip_cents: type: integer total_cents: type: integer description: The all-in total to show the account holder. approved_ceiling_cents: type: - integer - 'null' description: >- The most the merchant may charge once final tax and shipping settle. This is what the holder's approval covers; any unused amount is released. Null when the merchant prices the cart exactly. hash: type: string description: >- Identity of exactly this cart. Send it back as `confirm` to place it. description: Every open cart in the conversation, oldest first. catalog: type: array description: >- The last product search. Empty on a turn that did not search again, so keep the previous one. items: type: object properties: product_id: type: string description: The merchant's product link. name: type: - string - 'null' price_cents: type: - integer - 'null' image_url: type: - string - 'null' unmatched: type: array description: >- Things asked for that did not make it into a cart, with a reason. Show these rather than guessing from `reply`. items: type: object properties: merchant: type: string requested: type: string reason: type: string enum: - not_found - unavailable detail: type: - string - 'null' order_id: type: - string - 'null' description: Set when this turn placed an order. decline_code: type: - string - 'null' description: >- The machine reason behind `declined`, e.g. `items_unavailable`. approval_url: type: - string - 'null' description: >- Send to the holder when `status` is `awaiting_approval`. Never open it yourself. charge_status: type: - string - 'null' enum: - none - confirming - settled - unknown - null description: >- Whether money moved: `none`, `confirming`, `settled`, or `unknown` (do not retry; read the conversation). card_last4: type: - string - 'null' description: The saved card that paid, for naming it to the holder. error_code: type: - string - 'null' description: >- On `conflict`: `cart_changed`, `turn_in_progress`, `delivery_address_changed`, or `delivery_address_bound_after_cart`. error: type: string description: Present when `state` is `failed`. note: type: string description: The next step. '400': description: '`turn_id` is missing, or no card is saved on this account yet.' '404': description: No such turn on this account. security: - BearerAuth: [] components: securitySchemes: BearerAuth: type: apiKey in: header name: Authorization description: >- Firebase ID token from `/auth` or any paid route, sent as a Bearer token: `Authorization: Bearer ` (the `Bearer ` prefix is required). ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.