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The Natural API is REST-based and follows a simplified JSON:API structure. We use JSON:API to specify how our servers should respond to requests, and use a modified structure described below in order to specify how requests should be made to our servers.

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Requests

To create or update a resource, wrap your fields in data.attributes. No type, id, or relationships needed — the type is inferred from the endpoint and the ID is assigned by the server.

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Creating a resource

Send a POST request with a data object containing attributes: 
// POST /api/payments
{
  "data": {
    "attributes": {
      "amount": "500000",
      "currency": "USD",
      "counterparty": "pty_019cd1798d627ad9bc302511c4f2c115",
      "customer_party_id": "pty_019cd1798d617f65a79cb965dda9eac3",
      "description": "Payment for Q4 2025 development work"
    }
  }
}

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Updating a resource

To update a resource, send a PUT request with only the fields you want to change inside attributes. Omitted fields remain unchanged.
The Natural API uses PUT for partial updates — only the fields you include are modified.
// PUT /api/agents/{agent_id}
{
  "data": {
    "attributes": {
      "name": "Carrier Payment Agent v3.0",
      "status": "ACTIVE"
    }
  }
}

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Responses

Responses follow the JSON:API specification. Resources may be singular or be comprised of lists, and each resource in a response has:
  • type — A string identifying the kind of resource (e.g., "agent", "payment", "transaction")
  • id — A unique prefixed identifier (e.g., agt_019cd179..., pay_019cd179...)
  • attributes — The resource’s data fields
  • relationships (optional) — Links to related resources

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Single resource

Responses for a single resource wrap the resource in a data object: 
{
  "data": {
    "type": "agent",
    "id": "agt_019cd1798d637a4da75dce386343931d",
    "attributes": {
      "name": "Carrier Payment Agent v2.1",
      "description": "Autonomous agent that pays delivery carriers",
      "status": "ACTIVE",
      "created_at": "2026-01-04T15:30:00Z",
      "created_by": "usr_019cd1798d657de5b5fed4198cb9fac0",
      "updated_at": "2026-01-04T15:30:00Z",
      "updated_by": "usr_019cd1798d657de5b5fed4198cb9fac0"
    },
    "relationships": {
      "party": {
        "data": {
          "type": "party",
          "id": "pty_019cd1798d617f65a79cb965dda9eac3"
        }
      }
    }
  }
}

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List of resources

List endpoints return an array of resources in data, with pagination metadata in meta: 
{
  "data": [
    {
      "type": "transaction",
      "id": "txn_019cd1798d6672a7b828eee780291b72",
      "attributes": {
        "amount": "100000",
        "currency": "USD",
        "status": "COMPLETED",
        "transaction_type": "payment",
        "category": "sent",
        "direction": "OUTBOUND",
        "created_at": "2026-01-04T15:30:00Z"
      },
      "relationships": {
        "source_party": {
          "data": { "type": "party", "id": "pty_019cd1798d617f65a79cb965dda9eac3" }
        },
        "destination_party": {
          "data": { "type": "party", "id": "pty_019cd1798d627ad9bc302511c4f2c115" }
        }
      }
    }
  ],
  "meta": {
    "pagination": {
      "has_more": false,
      "next_cursor": null
    }
  }
}
Use the next_cursor value from meta.pagination to fetch subsequent pages.

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Relationships

Relationships connect resources to each other without nesting the full related resource. Each relationship contains a data object with the related resource’s type and id. Relationships appear only in responses. In requests, reference related resources by including their ID directly in attributes (e.g., customer_party_id).

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To-one relationships

A to-one relationship links to a single related resource: 
"customer_party": {
  "data": {
    "type": "party",
    "id": "pty_019cd1798d617f65a79cb965dda9eac3"
  }
}
A null value in data indicates the relationship is absent: 
"counterparty": {
  "data": null
}

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Common relationships

RelationshipDescriptionFound on
partyOwning partyAgents, Wallet Balances
customer_partyParty making the paymentPayments, Transactions
counterpartyParty receiving the paymentPayments
source_partyOriginating partyTransactions
destination_partyReceiving partyTransactions
source_walletOriginating walletTransactions
destination_walletReceiving walletTransactions

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Using relationship IDs

Use the type and id from a relationship to fetch the related resource. For example, if a payment response includes: 
"relationships": {
  "customer_party": {
    "data": { "type": "party", "id": "pty_019cd1798d617f65a79cb965dda9eac3" }
  }
}
You can look up the party using its ID in a subsequent request.

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Glossary

  • Resource — An entity in the Natural API, such as a payment, agent, or transaction.
  • Attribute — A piece of information about a resource (e.g., status, amount, created_at).
  • Relationship — A link from one resource to another, represented by type and id.