API Reference

Canonical HTTP reference for the Agent Passport service.

Base URL: http://localhost:3000 (default)

Conventions

src/lib/constants.ts.

{ error: string, code?: string }.

X402_ENABLED=true; the body includes the payment spec, and clients retry with a verified x-payment header.

accept the Idempotency-Key header. The HMAC auth middleware requires a signed request when HMAC_SECRET is set.

• All wallet addresses match ^[A-Z2-7]{58}$ (Algorand base32). See
• Successes are JSON. Errors are JSON with
• Every premium endpoint returns 402 Payment Required when
• Mutating endpoints (/delegate, /revoke, /reputation/record)
• All responses carry X-Request-ID (UUID).

Endpoint map

GET /score

Composite trust score (0–100) with five sub-scores.

Query parameters

Response 200 — see TrustScoreResponse (the algorithm is in concepts.md). Includes trustScore, riskLevel, breakdown, onChain, explanation.

Status codes: 200, 400, 402, 404, 429, 500

Caching: 60 s in responseCache. Invalidated on /delegate, /revoke, /reputation/record for the affected wallet.

GET /delegation

Delegation trust score from the sponsor graph BFS.

Same query / status codes as /score. Response shape: DelegationResponse — trustScore, riskLevel, breakdown (depth, sponsor quality, sponsor count, amount), delegation (depth, sponsorCount, isTrustAnchor, trustedAncestors), explanation.

POST /counterparty-check

Merchant counterparty check (60% on-chain + 40% delegation).

Request body

{ "buyer": "GD64Y..." }

Response 200 — CounterpartyCheckResponse: allow, confidence, riskLevel, trustScore, onChainScore, delegationScore, explanation[].

POST /credit-estimate

Estimate the credit capacity of a wallet.

Request body

{ "wallet": "GD64Y...", "amount": 5000 }

amount is optional. When present, the response includes assessedAmount and a risk adjusted to the requested amount.

Response 200 — CreditEstimate: estimatedLimit, risk, confidence, approved, breakdown, explanation[].

GET /sybil-check

12-signal sybil risk score.

Same query as /score. Response: sybilRisk (0–1), riskLevel, confidence, signals (12 fields — 7 wallet-history + 4 graph

• 1 sub-signal), clusterSize, flaggedWallets[], explanation[].

GET /reputation

Current reputation for a wallet.

Same query as /score. Response: reputation (0–100), riskLevel, confidence, breakdown (per-event counts and amounts), factors, explanation[].

POST /reputation/record

Record an on-chain reputation event.

Request body

{
  "wallet": "GD64Y...",
  "eventType": "payment",
  "amount": 100,
  "counterparty": "ABCDE..."
}

Idempotency: required. Idempotency-Key header.

Side effects

• Submits a transaction to reputation.teal (when REPUTATION_APP_ID>0)
• Increments totalEvents on-chain
• Invalidates passport:<wallet> and score:<wallet> in cache

GET /underwrite

Composite underwriting decision (Trust 0.35 + Delegation 0.25 + Sybil 0.20 + Reputation 0.20).

Same query as /score. Response: approved, recommendedLimit (capped by system exposure), riskLevel, confidence, compositeScore, factors[] (each {name, score, weight, contribution, status}), explanation[], sanctions?.

Side effects — increments data/system-exposure.json by the recommended limit when approved.

GET /trust-graph

Full trust-graph analytics: nodes, edges, exposure by depth, what-ifs.

Same query as /score, plus optional simulateSponsorLost=<wallet> to remove a sponsor from the graph and re-compute exposure.

Cost: 10+ indexer round-trips. Slowest endpoint in the service.

GET /passport

Full passport document.

Same query as /score. Response: wallet, generatedAt, blockRound, schemaVersion, identityStrength, trustScore, trustRiskLevel, reputation, reputationRiskLevel, totalEvents, paymentReliability, creditLimit, creditRisk, risk, sybilRisk, overallRiskLevel, onChain, delegation, capabilities, dataSources, summary, explanation, checksum.

Caching: 60 s.

GET /verify

Lightweight wallet verification — single fast account lookup.

Same query as /score. Response: valid, wallet, flags (funded, active, empty, lookup_failed).

Caching: 60 s.

GET /discovery/search

Bazaar catalog search (single self-listing). Filters by q (substring match on name/description/category/tags) and limit (1–100, default 20).

Webhook subscriptions

POST /reputation/subscribe, GET /reputation/subscribers, and DELETE /reputation/subscribe/:id require HMAC authentication when enabled and require an Idempotency-Key for mutating calls. Subscription secrets are returned only once at creation time.

POST /delegate

Submit an on-chain delegation. Requires REGISTRY_APP_ID>0 and OPERATOR_MNEMONIC set.

Request body

{ "sponsor": "SPON...", "agent": "AGEN...", "amount": 1000 }

Idempotency: required. Auth: HMAC if HMAC_SECRET is set.

Status codes: 201, 400, 401, 402, 409, 429, 500, 503

Side effects

passport:<sponsor>, passport:<agent> in cache

• Submits add_delegation to registry.teal
• Invalidates score:<sponsor>, score:<agent>,

POST /revoke

Revoke an on-chain delegation. Same auth and status codes as /delegate.

Request body

{ "sponsor": "SPON...", "agent": "AGEN..." }

amount is not used for revocation; the box is deleted entirely.

Health, readiness, metrics

None of the operational endpoints are rate-limited, none require payment, and all return JSON except /metrics (Prometheus text format).

GET /health — liveness

Always returns 200 with a static JSON body, unless the process is severely broken. Used as a Kubernetes livenessProbe.

{
  "status": "ok",
  "service": "Agent Passport",
  "version": "0.1.0",
  "network": "testnet",
  "x402": false,
  "timestamp": "2026-06-25T10:00:00.000Z"
}

GET /ready — readiness

Pings the configured algod endpoint and returns 200 if reachable, 503 if not. Used as a Kubernetes readinessProbe.

{
  "status": "ok",
  "service": "Agent Passport",
  "network": "testnet",
  "timestamp": "2026-06-25T10:00:00.000Z",
  "algorand": {
    "connected": true,
    "round": 52345678
  }
}

On failure: HTTP 503 with the same shape and algorand.connected: false.

GET /health/deep — informational

Combines /health and /ready shapes. It returns 200 when Algorand is reachable and 503 when the upstream probe is degraded. Used by operational dashboards and load balancers that need an upstream-aware health signal.

GET /registry/status

Reports whether the on-chain contracts are configured.

{ "configured": true, "appId": 12345 }

When REGISTRY_APP_ID=0: { "configured": false, "appId": 0 }.

GET /metrics

Prometheus-format metrics. Exempt from rate limiting. Returns Content-Type: text/plain; version=0.0.4 per the Prometheus spec.

The full inventory of metrics is documented in operations.md. The three families most operators look at first:

Scrape config

scrape_configs:
  - job_name: agent-passport
    metrics_path: /metrics
    scrape_interval: 30s
    scrape_timeout: 10s
    static_configs:
      - targets: ['agent-passport:3000']

Kubernetes probe example

livenessProbe:
  httpGet: { path: /health, port: 3000 }
  initialDelaySeconds: 10
  periodSeconds: 30
readinessProbe:
  httpGet: { path: /ready, port: 3000 }
  initialDelaySeconds: 5
  periodSeconds: 10

Error codes

Every error response has the shape:

{ "error": "Human-readable message", "code": "MACHINE_READABLE_CODE" }

code is optional and present only on selected errors.

400 Bad Request

Validation failure — the request was understood but a field was missing, malformed, or out of range.

401 Unauthorized

HMAC auth failed or missing. See security.md.

402 Payment Required

X402_ENABLED=true and the request did not carry a valid x-payment header. The body includes the PaymentRequirements per the x402 spec.

Enabled on every premium endpoint: /score, /delegation, /counterparty-check, /credit-estimate, /sybil-check, /reputation, /reputation/record, /underwrite, /trust-graph, /passport, /delegate, /revoke.

Never returned by /health, /ready, /health/deep, /metrics, /registry/status, /verify, /discovery/search.

404 Not Found

The wallet is not on the configured Algorand network (or is a fresh account with no history). Returned by /score, /delegation, /underwrite, /trust-graph, /passport, /sybil-check, /reputation, /credit-estimate, /verify.

{ "error": "Wallet not found on testnet" }

409 Conflict

Idempotency-Key reused with a different body. The middleware hashes the body and returns 409 if the hash differs from the cached one. Same key with the same body returns the cached response with the idempotent-replay: true header.

{ "error": "Idempotency-Key reused with different request body" }

413 Payload Too Large

Body parser cap exceeded. express.json({ limit: '100kb' }); larger bodies are rejected with a default 413 from Express.

429 Too Many Requests

Per-IP rate limit exceeded. Headers:

• X-RateLimit-Limit: 600
• X-RateLimit-Remaining: 0
• X-RateLimit-Reset: <unix-seconds>

{ "error": "Too many requests. Try again later." }

Bypassed for /health, /ready, /health/deep, /metrics, /registry/status, and IPs in RATE_LIMIT_TRUSTED_IPS.

500 Internal Server Error

Algorand RPC failure, unhandled exception, or contract submission error.

{ "error": "Internal server error" }

The full error is logged with the X-Request-ID for triage. The rate of agent_passport_http_request_errors_total{error_type="server_error"} is the canary metric.

503 Service Unavailable

code: "REGISTRY_NOT_CONFIGURED" when REGISTRY_APP_ID=0.

• /delegate and /revoke return 503 with
• /ready returns 503 when the Algorand endpoint is unreachable.

{ "error": "Delegation registry contract is not configured (REGISTRY_APP_ID=0)", "code": "REGISTRY_NOT_CONFIGURED" }

Specification files

• OpenAPI 3.0 — api/openapi.yaml
• Postman collection — api/postman-collection.json
• Bazaar metadata — bazaar-metadata.json