Common errors, debugging strategies, and frequently asked questions for SAP SDK v0.20.0.

Troubleshooting & FAQ

SDK Version: v0.20.0

Common Errors

`AgentNotActive` (error 6001)

Symptom: Agent operations fail with "Agent not found".

Cause: The wallet has never registered an agent, or the agent was closed.

Fix:

const agent = await client.agent.fetchNullable(agentPda);
if (!agent) {
  // Agent doesn't exist - register it
  await client.builder
    .agent("MyAgent")
    .description("Service agent")
    .register();
}

`EscrowInsufficientBalance` (error 6010)

Symptom: Settlement fails with insufficient balance.

Cause: The escrow does not have enough tokens for the settlement amount.

Fix:

import { BN } from "@coral-xyz/anchor";

const balance = await client.x402.getBalance(agentPda, depositorWallet);
if (balance.lt(new BN(requiredAmount))) {
  // Top up the escrow before settling
  await client.escrow.deposit(
    agentPda,
    depositorWallet,
    new BN(topUpAmount),
  );
}

`EscrowExpired` (error 6009)

Symptom: Cannot settle or withdraw from escrow.

Cause: The escrow has passed its expiresAt timestamp.

Fix:

// Close the expired escrow to recover funds
await client.escrow.close(agentPda, depositorWallet);

// Create a new escrow if needed
await client.x402.preparePayment(agentWallet, {
  pricePerCall: 10_000,
  maxCalls: 100,
  deposit: 1_000_000,
  expiresAt: Math.floor(Date.now() / 1000) + 86400, // 24 hours
});

`VaultAlreadyInitialized` (error 6015)

Symptom: initVault fails on second call.

Cause: A vault with this nonce already exists for the agent.

Fix: Check existence before initializing, or use a different nonce:

import { deriveVault } from "@oobe-protocol-labs/synapse-sap-sdk";

const [vaultPda] = deriveVault(agentPda, 0);
const vault = await client.vault.fetchNullable?.(vaultPda);
if (!vault) {
  await client.vault.initVault(0); // nonce = 0
}

`SessionClosed` (error 6017)

Symptom: Inscriptions fail with "session closed".

Cause: The session was already closed (either manually or by a delegate).

Fix: Open a new session with a different session ID:

await client.vault.openSession(vaultPda, "session-v2");

`DataExceedsMaxWriteSize` (error 6018)

Symptom: Inscribe or ledger write fails.

Cause: Data exceeds the 750-byte maximum per write.

Fix: Split the data into multiple writes:

import { sha256, hashToArray, LIMITS } from "@oobe-protocol-labs/synapse-sap-sdk";

const MAX = LIMITS.MAX_INSCRIPTION_SIZE; // 750 bytes
const chunks: Buffer[] = [];

for (let i = 0; i < data.length; i += MAX) {
  chunks.push(data.slice(i, i + MAX));
}

for (const chunk of chunks) {
  await client.vault.inscribe(
    sessionPda,
    chunk,
    hashToArray(sha256(chunk)),
  );
}

`RingBufferOverflow` (error 6019)

Symptom: Ledger write fails with "seal before writing more".

Cause: The ring buffer is full (4096 entries). Must seal the current page first.

Fix:

import { deriveLedger, LIMITS } from "@oobe-protocol-labs/synapse-sap-sdk";

const [ledgerPda] = deriveLedger(sessionPda);
const ledger = await client.ledger.fetch(ledgerPda);

if (ledger.numEntries >= LIMITS.RING_CAPACITY) {
  // Seal the current page before writing more
  await client.ledger.seal(ledgerPda, ledger.numPages);
}

// Now safe to write
await client.ledger.write(sessionPda, data, contentHash);

SAP Network Mismatch (x402 error)

Symptom: x402 payment call rejected by the agent.

Cause: Your X-Payment-Network header does not match the agent's expected network format.

Fix: Use the network normalizer:

import {
  isNetworkEquivalent,
  getNetworkGenesisHash,
} from "@oobe-protocol-labs/synapse-sap-sdk";

// If the agent requires genesis-hash form:
const network = getNetworkGenesisHash("mainnet");
// → "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"

WebSocket 400 Errors

Symptom: SPL token operations fail with HTTP 400 on WebSocket.

Cause: Authenticated RPC rejects WebSocket connections for token subscriptions.

Fix: Use the dual-connection strategy:

import { createDualConnection } from "@oobe-protocol-labs/synapse-sap-sdk";

const { primary, fallback } = createDualConnection({
  primaryUrl: "https://us-1-mainnet.oobeprotocol.ai/rpc?api_key=YOUR_KEY",
  // fallback auto-detected from cluster
});

See the RPC & Network Configuration guide for details.

"Zod is required" Error

Symptom: [SAP SDK] Zod is required for schema validation. Install it: npm install zod

Cause: You imported a Zod schema factory without installing the zod peer dependency.

Fix:

npm install zod

Zod is optional. It is only required if you import schema validation utilities from the SDK.

Quick Error Code Reference

Code	Name	Meaning
6000	`AgentAlreadyRegistered`	This wallet already has a registered agent
6001	`AgentNotFound`	No agent PDA exists for this wallet
6009	`EscrowExpired`	Escrow past its `expiresAt` timestamp
6010	`EscrowInsufficientBalance`	Balance too low for settlement
6011	`EscrowNotActive`	Escrow is closed or disputed
6015	`VaultAlreadyInitialized`	Vault with this nonce already exists
6017	`SessionClosed`	Session is closed, no further writes
6018	`DataExceedsMaxWriteSize`	Data exceeds 750-byte limit
6019	`RingBufferOverflow`	Ring buffer full, seal before writing
6020	`InvalidEpochIndex`	Epoch index doesn't match sequence / 1000
6021	`DelegateExpired`	Vault delegate has expired
6022	`DisputeAlreadyFiled`	Dispute already exists for this escrow
6023	`DisputeWindowExpired`	Dispute filing window has passed

No. The SDK requires @coral-xyz/anchor as a peer dependency. It uses Anchor providers and program interfaces under the hood. You can create a minimal provider with SapClient.from(AnchorProvider.env()).

Q: What Solana clusters are supported?

Mainnet-beta, devnet, and localnet. Custom clusters work if you provide the RPC URL.

Q: Do I need PostgreSQL?

No. PostgreSQL is optional. The pg package is a peer dependency — only install it if you want off-chain mirroring and analytics.

Q: How much SOL does registration cost?

Agent registration: ~0.018 SOL in rent (reclaimable on close)

AgentAccount: ~0.014 SOL
AgentStats: ~0.004 SOL

Tools: ~0.008 SOL each (reclaimable)

Escrows: ~0.002 SOL for the account + deposit amount

See the Cost Optimization guide for details.

Q: Can multiple wallets control one agent?

No. Each agent PDA is derived from a single wallet. Use the Vault Delegation system to grant hot-wallet access to specific operations. See the Security guide.

Q: How do I migrate from v0.19.x to v0.20.0?

v0.20.0 is backward compatible. Key changes:

Dispute module added (optional)
Enhanced ledger with better sealing
38 event parsers (up from 32)
No breaking changes to existing APIs

Q: What is the One Agent Per User constraint?

Each wallet can register exactly ONE agent. This is enforced via PDA derivation ["sap_agent", owner]. If you need to create a new agent, you must first close the existing one with client.agent.close().

Q: How do I debug a failing transaction?

Use simulation first:

try {
  await client.agent.register({ /* ... */ });
} catch (error: unknown) {
  if (error instanceof Error && error.message.includes("Simulation failed")) {
    const logs = (error as any).logs as string[] | undefined;
    if (logs) {
      console.error("Program logs:");
      for (const log of logs) {
        console.error("  ", log);
      }
    }
  }
}

Or use the CLI:

synapse-sap agent register --manifest agent.json --simulate --verbose

Debugging Strategies

1. Use `doctor run` First

synapse-sap doctor run --json

This checks Node version, SDK compatibility, environment variables, keypair validity, RPC reachability, and disk space.

2. Enable Verbose Logging

const client = SapClient.from(AnchorProvider.env(), {
  debug: true,  // Enable debug logging
});

3. Check Cluster Configuration

synapse-sap config list | grep cluster

Ensure you're on the expected cluster (mainnet/devnet/localnet).

4. Verify PDA Derivation

import { deriveAgent } from "@oobe-protocol-labs/synapse-sap-sdk/pda";

const [expectedPda] = deriveAgent(walletPublicKey);
console.log("Expected PDA:", expectedPda.toBase58());

// Compare with the PDA you're using
console.log("Using PDA:", actualPda.toBase58());
console.log("Match:", expectedPda.equals(actualPda));

Next Steps

Error Handling — Structured error patterns
Security — Security best practices
On-Chain Reference — Account types and seeds

Last Updated: June 2026
SDK Version: 0.20.0

Troubleshooting & FAQ

Troubleshooting & FAQ

Common Errors

`AgentNotActive` (error 6001)

`EscrowInsufficientBalance` (error 6010)

`EscrowExpired` (error 6009)

`VaultAlreadyInitialized` (error 6015)

`SessionClosed` (error 6017)

`DataExceedsMaxWriteSize` (error 6018)

`RingBufferOverflow` (error 6019)

SAP Network Mismatch (x402 error)

WebSocket 400 Errors

"Zod is required" Error

Quick Error Code Reference

FAQ

Q: Can I use the SDK without Anchor?

Q: What Solana clusters are supported?

Q: Do I need PostgreSQL?

Q: How much SOL does registration cost?

Q: Can multiple wallets control one agent?

Q: How do I migrate from v0.19.x to v0.20.0?

Q: What is the One Agent Per User constraint?

Q: How do I debug a failing transaction?

Debugging Strategies

1. Use `doctor run` First

2. Enable Verbose Logging

3. Check Cluster Configuration

4. Verify PDA Derivation

Next Steps

On this page