# Strale

> The trust layer of the agent economy. Independently quality-scored API capabilities for AI agents.

Strale is a capability marketplace for AI agents. It provides compliance checks, company data, payment validation, regulatory intelligence, and developer tools — all with transparent per-call pricing and quality scores. For live capability and country counts see https://api.strale.io/v1/platform/facts; the dynamic version of this file lives at https://api.strale.io/llms.txt.

## x402 Pay-Per-Use (recommended for agents)

All capabilities are available via x402 — the HTTP-native payment protocol. Pay per request with USDC on Base mainnet. No signup, no API key needed.

- Catalog: GET https://api.strale.io/x402/catalog
- Discovery: GET https://api.strale.io/.well-known/x402.json
- Protocol: USDC on Base mainnet (eip155:8453)
- Pricing: $0.005 to $0.10 per call depending on capability

Example:
  GET https://api.strale.io/x402/sanctions-check?name=John+Doe
  → HTTP 402 with paymentRequirements (USDC, $0.02)
  → Retry with X-Payment header containing signed USDC transfer
  → HTTP 200 with sanctions screening result

## API Key Access (for developers)

- Base URL: https://api.strale.io/v1
- Execution: POST /v1/do
- Auth: Bearer token (sign up at strale.dev)
- Pricing: EUR wallet, prepaid via Stripe
- Trial: €2.00 free credits, no card required

### Request structure

POST /v1/do request body:

```
{
  "capability_slug": "iban-validate",   // Required: the capability to call
  "inputs": {                            // Required: capability-specific input fields
    "iban": "DE89370400440532013000"
  },
  "max_price_cents": 100                 // Optional: budget cap, in EUR cents
}
```

Headers: `Authorization: Bearer <api_key>`, `Content-Type: application/json`, optional `Idempotency-Key`.

The `inputs` field is plural (not `input`) and wraps capability-specific fields. Top-level fields like `email` are rejected — wrap them inside `inputs`.

### Response structure

POST /v1/do returns a two-tier response:

```
{
  "result": {                    // What you asked for
    "transaction_id": "...",
    "status": "completed",
    "capability_used": "iban-validate",
    "output": { ... },           // The actual capability result
    "provenance": { "source": "...", "fetched_at": "..." },
    "price_cents": 0,
    "latency_ms": 8
  },
  "meta": {                      // Trust layer metadata
    "quality": { "sqs": 85, "label": "Good", ... },
    "execution_guidance": { "usable": true, "strategy": "direct" },
    "audit": { ... }             // EU AI Act compliant audit trail
  }
}
```

Free-tier responses also include `free_tier`, `usage`, and `upgrade` at the top level.
Error responses are flat: `error_code` + `message` + `details`.

## MCP Server

- npm: strale-mcp (stdio transport)
- HTTP transport: POST https://api.strale.io/mcp (Authorization: Bearer)
- Config: claude mcp add --transport http strale https://api.strale.io/mcp --header "Authorization: Bearer YOUR_KEY"
- Works with Claude Desktop, Claude Code, ChatGPT, Cursor, Windsurf, VS Code Copilot, and any MCP client
- Full setup guides for every supported client: https://strale.dev/integrations

## Agent Framework SDKs

- TypeScript / Node: `npm install straleio`
- Python: `pip install straleio`
- LangChain: `pip install langchain-strale`
- CrewAI: `pip install crewai-strale`
- Semantic Kernel: `npm install strale-semantic-kernel`
- All five toolkits expose every Strale capability with typed input schemas, pricing, and SQS in tool descriptions.

## A2A Protocol

- Agent Card: GET https://api.strale.io/.well-known/agent-card.json
- Task endpoint: POST https://api.strale.io/a2a

## Capability categories

- Company data: Business registry lookups across the supported country set
- Compliance & KYC: Sanctions screening, PEP checks, adverse media, beneficial ownership, AML risk scoring
- Financial validation: IBAN validation, VAT verification (VIES), BIC/SWIFT lookup, exchange rates, invoice validation
- Regulatory intelligence: EU AI Act classification, GDPR website audits, data protection authority lookup
- Web intelligence: Domain reputation, WHOIS, SSL checks, tech stack detection
- Developer tools: Code conversion, API generation, schema validation
- Data processing: PII redaction, translation, summarization
- Media: C2PA Content Credentials inspection, AI-generation detection, manifest verification

## Bundled solutions

100 multi-capability workflows including:
- Nordic KYC (Sweden, Norway, Denmark, Finland)
- Web3 Counterparty KYB
- DeFi Risk Check
- B2B Payment Validation
- GDPR Compliance Audit
- Token Project Due Diligence
- Full list: GET https://api.strale.io/v1/solutions

## Quality

Every capability has a dual-profile Strale Quality Score (SQS) with grades A through E, updated continuously via automated test suites.

## Links

- Website: https://strale.dev
- API docs: https://strale.dev/docs
- Integrations (all clients + SDKs): https://strale.dev/integrations
- x402 catalog: https://api.strale.io/x402/catalog
- MCP server (stdio): https://www.npmjs.com/package/strale-mcp
- MCP server (HTTP): https://api.strale.io/mcp
- Agent Card: https://api.strale.io/.well-known/agent-card.json
- Contact: hello@strale.io