@agent-score/sdk

The official TypeScript/Node.js client for AgentScore. Verify the human behind an agent (KYC, age, sanctions, jurisdiction) and gate payments, in a few lines.

Install

npm install @agent-score/sdk
# or
bun add @agent-score/sdk

Quick Start

import { AgentScore } from "@agent-score/sdk";

const client = new AgentScore({ apiKey: "as_live_..." });

// Look up cached reputation (free)
const rep = await client.getReputation("0x1234...");
console.log(rep.score.value, rep.score.grade);

// Filter to a specific chain
const baseRep = await client.getReputation("0x1234...", { chain: "base" });
console.log(baseRep.agents); // only Base agents

// Identity gate with policy (paid)
const gated = await client.assess("0x1234...", {
  policy: {
    require_kyc: true,
    require_sanctions_clear: true,
    min_age: 21,
  },
});

if (gated.decision === "deny") {
  console.log(gated.decision_reasons); // ["kyc_required"]
  console.log(gated.verify_url);       // URL for operator verification
}

// Check verification level on reputation
const verified = await client.getReputation("0x1234...");
console.log(verified.verification_level); // "none" | "wallet_claimed" | "kyc_verified"

Credential-Based Identity

Agents without wallets can use operator credentials for identity:

// Assess with an operator credential instead of a wallet address
const result = await client.assess(null, { operatorToken: "opc_..." });
console.log(result.decision); // "allow" | "deny"

Verification Sessions

Bootstrap identity for first-time agents. The success body carries structured next_steps (with action: "deliver_verify_url_and_poll") and a cross-merchant agent_memory hint. Poll responses carry next_steps.action from the typed NextStepsAction union (continue_polling, retry_merchant_request_with_operator_token, use_stored_operator_token, create_new_session, verification_failed, contact_support).

// Create a session, returns a verify_url for the user and a poll_url for the agent
const session = await client.createSession();
console.log(session.verify_url, session.poll_url, session.poll_secret);
console.log(session.next_steps.action); // "deliver_verify_url_and_poll"

// Poll until the user completes verification
const status = await client.pollSession(session.session_id, session.poll_secret);
if (status.status === "verified") {
  console.log(status.operator_token); // "opc_...", use for future requests
}

// Optional pre-association: attach the session to a known wallet or refresh KYC
// for an existing operator credential.
await client.createSession({ address: "0x..." });
await client.createSession({ operator_token: "opc_..." }); // KYC refresh

Wallet resolution

assess() responses include resolved_operator and linked_wallets[], all same-operator sibling wallets (claimed via SIWE or captured via prior associateWallet). The list may mix EVM addresses (0x... lowercased) and Solana addresses (base58, case-preserved) for cross-chain operators; merchants doing wallet-signer-match checks should accept a payment signed by any address in the list, regardless of chain. The address parameter on assess() and getReputation() accepts either format; the network is auto-detected from the address shape.

Server-side signer-match + sanctions screening

Pass signer: { address, network } on assess() to opt into server-side wallet-signer-match and OFAC SDN wallet-address screening on the same call. The response carries two new verdicts:

const result = await client.assess("0xclaimed...", {
  signer: { address: "0xsigner...", network: "evm" },
  policy: { require_sanctions_clear: true },
});

// signer_match: wallet-binding verdict
//   kind: 'pass' | 'wallet_signer_mismatch' | 'wallet_auth_requires_wallet_signing'
//   plus claimed_operator / signer_operator / expected_signer / actual_signer / linked_wallets / agent_instructions
if (result.signer_match?.kind === "wallet_signer_mismatch") {
  // signer wallet resolves to a different operator than the claimed address
}

// signer_sanctions: OFAC SDN wallet-address verdict (discriminated union)
//   { status: 'clear' } | { sanctioned: true, ofac_label, sdn_uid, listed_at } | { status: 'unavailable' }
if (result.signer_sanctions && "sanctioned" in result.signer_sanctions) {
  console.log("OFAC hit:", result.signer_sanctions.ofac_label, result.signer_sanctions.sdn_uid);
}

Wallet-OFAC SDN enforcement on the signer block is unconditional whenever a signer is supplied; no policy.require_sanctions_clear opt-in is required. The API flips decision to deny when signer_sanctions is sanctioned: true OR status: 'unavailable', with decision_reasons including sanctions_flagged or sanctions_check_unavailable respectively (fail-closed; OFAC strict-liability). policy.require_sanctions_clear is the separate NAME-based screen on the resolved operator's KYC identity.

Pass signer.address: null for rails without a wallet signer (Stripe SPT, card-only). The API responds with signer_match.kind = 'wallet_auth_requires_wallet_signing' and a parsed agent_instructions block telling the agent to switch to X-Operator-Token auth, spread the block directly into a 403 body.

Credential Management

const cred = await client.createCredential({ label: "my-agent", ttl_days: 7 });
console.log(cred.credential); // shown once

const list = await client.listCredentials();
console.log(list); // active, non-expired credentials

await client.revokeCredential(cred.id);

Report an Agent's Wallet (Cross-Merchant Attribution)

After an agent authenticated via operator_token completes a payment, report the signer wallet so AgentScore can build a cross-merchant credential↔wallet profile. Fire-and-forget, first_seen is informational only. network is the key-derivation family: "evm" for any EVM chain (Base, Tempo, Ethereum, …) or "solana" for Solana.

await client.associateWallet({
  operatorToken: "opc_...",
  walletAddress: signerFromPayment, // e.g. EIP-3009 `from` or Tempo MPP DID address
  network: "evm",
  idempotencyKey: paymentIntentId, // optional, agent retries of the same payment no-op
});

Configuration

Option	Type	Default	Description
apiKey	string	---	API key from agentscore.com
baseUrl	string	https://api.agentscore.com	API base URL
timeout	number	10000	Request timeout in ms
userAgent	string	---	Prepended to the default User-Agent as "{userAgent} (@agent-score/sdk@{version})". Use to attribute API calls to your app.

Error Handling

import { AgentScore, AgentScoreError } from "@agent-score/sdk";

try {
  await client.getReputation("0xinvalid");
} catch (err) {
  if (err instanceof AgentScoreError) {
    console.error(err.code, err.message, err.status);
  }
}

AgentScoreError.details carries the rest of the response body (verify_url, linked_wallets, claimed_operator, actual_signer, expected_signer, reasons, agent_memory) so callers can branch on granular denial codes without re-parsing.

Typed error classes

For status-code-specific recovery, the SDK throws typed subclasses of AgentScoreError. All inherit from AgentScoreError so existing catch (err) { if (err instanceof AgentScoreError) ... } still works.

Class	Triggered by	What it adds
PaymentRequiredError	HTTP 402	The endpoint is not enabled for this account
TokenExpiredError	HTTP 401 with error.code = "token_expired"	Parsed body fields exposed on the instance: verifyUrl, sessionId, pollSecret, pollUrl, nextSteps, agentMemory, recover without re-parsing details
InvalidCredentialError	HTTP 401 with error.code = "invalid_credential"	Permanent, switch tokens or restart
QuotaExceededError	HTTP 429 with error.code = "quota_exceeded"	Account-level cap reached; don't retry
RateLimitedError	HTTP 429 with error.code = "rate_limited"	Per-second sliding-window cap; retry after Retry-After
TimeoutError	Request aborted before a response arrived	Distinct from generic network errors

import {
  AgentScore, AgentScoreError, TokenExpiredError, QuotaExceededError, TimeoutError,
} from "@agent-score/sdk";

try {
  await client.assess("0xabc...", { policy: { require_kyc: true } });
} catch (err) {
  if (err instanceof TokenExpiredError) {
    console.log("Verify at:", err.verifyUrl, "poll with:", err.pollSecret);
  } else if (err instanceof QuotaExceededError) {
    console.log("Account quota reached, surface to user; don't retry.");
  } else if (err instanceof TimeoutError) {
    console.log("Network timeout, retry with backoff.");
  } else if (err instanceof AgentScoreError) {
    console.error(err.code, err.message);
  }
}

Quota observability

assess() responses include an optional quota field captured from X-Quota-Limit / X-Quota-Used / X-Quota-Reset response headers. Use it to monitor approach-to-cap proactively (warn at 80%, alert at 95%) before a 429:

const result = await client.assess("0xabc...", { policy: { require_kyc: true } });
if (result.quota && result.quota.limit && result.quota.used) {
  const pct = (result.quota.used / result.quota.limit) * 100;
  if (pct > 80) console.warn(`AgentScore quota at ${pct.toFixed(1)}%, resets ${result.quota.reset}`);
}

quota is undefined when the API doesn't emit the headers (Enterprise / unlimited tiers). On a 429 response the SDK throws QuotaExceededError / RateLimitedError instead of returning a body, so quota is only readable on successful calls; drive proactive alerting off the success-path field.

Telemetry

telemetrySignerMatch(payload) is a fire-and-forget POST to /v1/telemetry/signer-match so AgentScore can track aggregate signer-binding behavior across merchants. Used internally by @agent-score/commerce's gate; available directly for custom integrations that perform their own wallet-signer-match checks.

Documentation

• API Reference

License

MIT