{"passport":{"unfragile":{"@version":"1.0","version":"2026-05","artifact":{"id":"awesome-fewsats","slug":"fewsats","name":"Fewsats","type":"mcp","url":"https://github.com/Fewsats/fewsats-mcp","page_url":"https://unfragile.ai/fewsats","categories":["mcp-servers"],"tags":[],"pricing":{"model":"open_source","free":true,"starting_price":null},"status":"active","verified":false},"capabilities":[{"id":"awesome-fewsats__cap_0","uri":"capability://tool.use.integration.mcp.based.payment.tool.exposure.to.ai.agents","name":"mcp-based payment tool exposure to ai agents","description":"Exposes payment operations as standardized MCP (Model Context Protocol) tools that AI agents like Claude can discover and invoke through a FastMCP server framework. The server implements a request-response pattern where agents call tools with structured parameters, the FastMCP framework routes them to handler functions, and responses are serialized back to the agent. This enables AI agents to treat payment operations as first-class capabilities without custom integration code.","intents":["Enable Claude or other MCP-compatible AI agents to initiate payments programmatically","Expose payment capabilities through a standardized protocol that works across multiple AI platforms","Allow agents to discover available payment operations and their required parameters at runtime"],"best_for":["AI agent developers building autonomous purchasing workflows","Teams integrating payment capabilities into Claude Desktop or other MCP-compatible platforms","Builders creating multi-step agents that need to execute transactions as part of larger workflows"],"limitations":["Requires MCP-compatible AI platform (Claude Desktop, or custom MCP clients) — not compatible with standard REST API clients","Tool invocation is synchronous — no built-in support for long-polling or webhook-based async payment confirmations","No transaction batching — each payment operation requires a separate tool call"],"requires":["Python 3.10 or higher","MCP framework version 1.4.1 or higher","Valid FEWSATS_API_KEY environment variable","MCP-compatible AI platform (Claude Desktop recommended)"],"input_types":["structured JSON parameters (offer_id, l402_offer, payment_id, etc.)","environment variables (FEWSATS_API_KEY)"],"output_types":["structured JSON responses (payment status, balance info, transaction details)","error messages with HTTP status codes"],"categories":["tool-use-integration","payment-processing"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-fewsats__cap_1","uri":"capability://tool.use.integration.wallet.balance.retrieval.with.real.time.account.state","name":"wallet balance retrieval with real-time account state","description":"Implements a balance() tool that queries the Fewsats payment platform via the Fewsats client library to fetch current wallet balance and account information. The tool makes an authenticated API call using the FEWSATS_API_KEY, receives structured balance data from the backend, and returns it to the agent. This enables agents to check available funds before initiating payments or to report account status.","intents":["Check available wallet balance before attempting a payment","Verify account funding status as part of payment validation logic","Report current account balance to users or downstream systems"],"best_for":["Agents that need to validate sufficient funds before payment attempts","Workflows requiring balance checks as a precondition for other operations","Systems that need to report account status to end users"],"limitations":["No caching — each call hits the Fewsats API, introducing ~100-500ms latency per request","Returns point-in-time snapshot only — does not track balance changes over time","No support for multi-currency or multi-account balance queries in a single call"],"requires":["Python 3.10+","Valid FEWSATS_API_KEY environment variable","Active Fewsats account with API access"],"input_types":["none (no parameters required)"],"output_types":["structured JSON with balance information (amount, currency, account status)"],"categories":["tool-use-integration","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-fewsats__cap_2","uri":"capability://tool.use.integration.payment.method.discovery.and.enumeration","name":"payment method discovery and enumeration","description":"Exposes a payment_methods() tool that queries the Fewsats platform to retrieve all available payment methods supported by the user's account. The tool calls the Fewsats client library to fetch the list of payment methods, which may include credit cards, bank transfers, cryptocurrency, or other payment rails. Agents can use this to understand what payment options are available before initiating a transaction.","intents":["Discover what payment methods are available for the current account","Present payment options to users or downstream systems","Validate that a specific payment method is available before attempting to use it"],"best_for":["Multi-payment-method workflows where agents need to select the best option","User-facing systems that need to display available payment options","Agents that need to handle payment method fallbacks or retries"],"limitations":["Returns static list of available methods — does not include method-specific details like card last-4 digits or expiration dates","No filtering or sorting — returns all methods without ability to prioritize by cost, speed, or other criteria","Does not validate method availability for specific payment amounts or currencies"],"requires":["Python 3.10+","Valid FEWSATS_API_KEY environment variable","Active Fewsats account with at least one payment method configured"],"input_types":["none (no parameters required)"],"output_types":["structured JSON array of payment method objects (method type, identifier, metadata)"],"categories":["tool-use-integration","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-fewsats__cap_3","uri":"capability://tool.use.integration.offer.based.payment.execution.with.l402.protocol.support","name":"offer-based payment execution with l402 protocol support","description":"Implements a pay_offer() tool that processes payments by accepting an offer_id and optional l402_offer parameter, then calling the Fewsats client library to execute the payment. The tool supports the L402 protocol (Lightning-402 HTTP authentication), which allows agents to handle payment challenges and proofs in a standardized way. The tool returns payment status and transaction details after execution.","intents":["Execute a payment for a specific offer identified by offer_id","Handle L402 payment challenges and generate payment proofs","Complete end-to-end payment workflows initiated by external services"],"best_for":["Agents integrating with services that use L402 payment protocol","Workflows where payments are tied to specific offers or invoices","Systems requiring proof-of-payment for audit or compliance purposes"],"limitations":["Requires offer_id to be pre-generated by external service — tool does not create offers","L402 support adds complexity — agents must understand L402 protocol to use this feature effectively","No idempotency guarantees — duplicate calls may result in duplicate charges if not handled by caller","Synchronous execution only — payment must complete within tool call timeout (typically 30-60 seconds)"],"requires":["Python 3.10+","Valid FEWSATS_API_KEY environment variable","Valid offer_id from Fewsats or compatible service","Optional: L402 offer token if using L402 protocol"],"input_types":["structured JSON with offer_id (string) and optional l402_offer (string)"],"output_types":["structured JSON with payment status, transaction ID, confirmation details"],"categories":["tool-use-integration","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-fewsats__cap_4","uri":"capability://tool.use.integration.payment.status.and.transaction.detail.retrieval","name":"payment status and transaction detail retrieval","description":"Exposes a payment_info() tool that retrieves detailed information about a specific payment transaction using a payment ID (pid). The tool queries the Fewsats backend via the client library to fetch transaction status, amount, timestamp, payment method used, and other metadata. Agents can use this to verify payment completion, track transaction history, or handle payment failures.","intents":["Check the status of a previously initiated payment","Retrieve transaction details for reconciliation or audit purposes","Verify payment completion before proceeding with downstream workflows"],"best_for":["Agents that need to poll payment status after initiating a transaction","Workflows requiring transaction verification before fulfilling orders","Systems that need to track payment history and generate reports"],"limitations":["Requires valid payment_id — tool cannot search or filter payments by other criteria","No transaction history pagination — cannot retrieve multiple payments in a single call","Status information is point-in-time — does not include real-time updates or webhooks","Limited to payments initiated through the same Fewsats account"],"requires":["Python 3.10+","Valid FEWSATS_API_KEY environment variable","Valid payment_id from a previous payment operation"],"input_types":["structured JSON with pid (payment ID string)"],"output_types":["structured JSON with payment status, amount, timestamp, payment method, transaction details"],"categories":["tool-use-integration","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-fewsats__cap_5","uri":"capability://tool.use.integration.billing.information.and.account.metadata.retrieval","name":"billing information and account metadata retrieval","description":"Implements a billing_info() tool that queries the Fewsats platform to retrieve billing-related account information such as billing address, payment history summary, account status, and subscription details. The tool calls the Fewsats client library to fetch this metadata and returns it as structured JSON. Agents can use this to understand account configuration, verify billing status, or generate billing reports.","intents":["Retrieve billing address and account holder information","Check account status and subscription details","Generate billing reports or verify account configuration"],"best_for":["Agents that need to verify account billing configuration before payments","Workflows requiring billing metadata for compliance or reporting","Systems that need to display account information to users"],"limitations":["Read-only operation — tool cannot update billing information","Returns account-level billing data only — does not include per-transaction billing details","No filtering or search — returns all billing metadata without ability to query specific fields","Billing history is summary only — does not provide detailed transaction-by-transaction breakdown"],"requires":["Python 3.10+","Valid FEWSATS_API_KEY environment variable","Active Fewsats account with billing information configured"],"input_types":["none (no parameters required)"],"output_types":["structured JSON with billing address, account status, subscription details, payment history summary"],"categories":["tool-use-integration","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-fewsats__cap_6","uri":"capability://safety.moderation.secure.api.key.management.and.authentication","name":"secure api key management and authentication","description":"Manages authentication to the Fewsats payment platform through environment variable-based API key injection. The server reads FEWSATS_API_KEY from the environment at startup and passes it to the Fewsats client library, which uses it to authenticate all API requests. This approach keeps credentials out of code and tool parameters, reducing the risk of accidental exposure. The authentication is transparent to agents — they invoke tools without handling credentials directly.","intents":["Authenticate all Fewsats API calls without exposing credentials to agents","Manage API key lifecycle and rotation through environment variables","Ensure payment operations are authorized and tied to a specific Fewsats account"],"best_for":["Production deployments where API keys must be kept out of agent prompts and logs","Teams using environment-based secret management (Docker, Kubernetes, CI/CD platforms)","Systems requiring audit trails of which account initiated payments"],"limitations":["API key must be set in environment before server startup — no runtime key rotation without restart","No support for multiple Fewsats accounts in a single server instance","No built-in key expiration or rotation mechanism — relies on external secret management","Environment variable approach is less flexible than credential files or secret stores for complex deployments"],"requires":["Python 3.10+","FEWSATS_API_KEY environment variable set before server startup","Valid API key from Fewsats.com"],"input_types":["environment variables (FEWSATS_API_KEY)"],"output_types":["authenticated Fewsats client instance (internal, not exposed to agents)"],"categories":["safety-moderation","tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-fewsats__cap_7","uri":"capability://tool.use.integration.fastmcp.server.framework.integration.and.tool.registration","name":"fastmcp server framework integration and tool registration","description":"Builds on the FastMCP framework to automatically register payment tools with standardized schemas, enabling AI agents to discover tool signatures and invoke them through the MCP protocol. The server creates a FastMCP instance, decorates tool functions with MCP metadata, and exposes them through a standardized interface. FastMCP handles protocol negotiation, schema validation, and request routing automatically, abstracting away MCP protocol complexity from tool implementations.","intents":["Register payment tools with standardized schemas that agents can discover","Enable automatic schema validation of tool parameters before execution","Provide a standardized interface that works across multiple MCP-compatible AI platforms"],"best_for":["Teams building MCP servers for AI agent integration","Developers who want to expose payment capabilities without implementing MCP protocol details","Systems that need to work with multiple AI platforms through a single interface"],"limitations":["Requires MCP framework version 1.4.1+ — older versions may not support all features","Tool schemas are static — cannot be modified at runtime based on account configuration","No built-in support for tool versioning or deprecation","FastMCP adds ~50-100ms overhead per tool invocation for protocol handling"],"requires":["Python 3.10+","MCP framework version 1.4.1 or higher","FastMCP server instance (created in server.py)"],"input_types":["tool function definitions with MCP decorators"],"output_types":["MCP-compliant tool schemas and responses"],"categories":["tool-use-integration","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"awesome-fewsats__cap_8","uri":"capability://tool.use.integration.fewsats.client.library.abstraction.and.api.wrapping","name":"fewsats client library abstraction and api wrapping","description":"Wraps the Fewsats client library (version 0.0.19+) to provide a consistent interface for all payment operations. The server instantiates the Fewsats client with the API key and delegates all payment API calls to it, handling authentication, request formatting, and response parsing transparently. This abstraction allows the MCP server to focus on tool exposure while the Fewsats client handles protocol details, error handling, and API versioning.","intents":["Provide a consistent interface to Fewsats payment operations","Abstract away Fewsats API versioning and protocol details from agents","Handle authentication and error responses from the Fewsats backend"],"best_for":["Teams integrating with Fewsats payment platform","Developers who want to avoid direct Fewsats API calls in agent code","Systems that need to handle Fewsats API errors gracefully"],"limitations":["Tightly coupled to Fewsats client library version 0.0.19+ — incompatible with older versions","No support for Fewsats API features not exposed by the client library","Error handling is delegated to the Fewsats client — limited control over error responses","No caching or request batching — each tool call results in a separate API request"],"requires":["Python 3.10+","Fewsats client library version 0.0.19 or higher","Valid FEWSATS_API_KEY environment variable"],"input_types":["structured parameters matching Fewsats client method signatures"],"output_types":["structured responses from Fewsats client (payment status, balance, transaction details)"],"categories":["tool-use-integration","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0}],"trust":{"score":26,"verified":false,"data_access_risk":"high","permissions":["Python 3.10 or higher","MCP framework version 1.4.1 or higher","Valid FEWSATS_API_KEY environment variable","MCP-compatible AI platform (Claude Desktop recommended)","Python 3.10+","Active Fewsats account with API access","Active Fewsats account with at least one payment method configured","Valid offer_id from Fewsats or compatible service","Optional: L402 offer token if using L402 protocol","Valid payment_id from a previous payment operation"],"failure_modes":["Requires MCP-compatible AI platform (Claude Desktop, or custom MCP clients) — not compatible with standard REST API clients","Tool invocation is synchronous — no built-in support for long-polling or webhook-based async payment confirmations","No transaction batching — each payment operation requires a separate tool call","No caching — each call hits the Fewsats API, introducing ~100-500ms latency per request","Returns point-in-time snapshot only — does not track balance changes over time","No support for multi-currency or multi-account balance queries in a single call","Returns static list of available methods — does not include method-specific details like card last-4 digits or expiration dates","No filtering or sorting — returns all methods without ability to prioritize by cost, speed, or other criteria","Does not validate method availability for specific payment amounts or currencies","Requires offer_id to be pre-generated by external service — tool does not create offers","builder identity is not verified yet","no observed match outcomes yet"],"rank_breakdown":{"adoption":0.05,"quality":0.28,"ecosystem":0.39999999999999997,"match_graph":0.25,"freshness":0.52,"weights":{"adoption":0.25,"quality":0.25,"ecosystem":0.15,"match_graph":0.23,"freshness":0.12}},"observed_outcomes":{"matches":0,"success_rate":0,"avg_confidence":0,"top_intents":[],"last_matched_at":null},"maintenance":{"status":"active","updated_at":"2026-06-17T09:51:03.039Z","last_scraped_at":"2026-05-03T14:00:15.503Z","last_commit":null},"community":{"stars":null,"forks":null,"weekly_downloads":null,"model_downloads":null,"model_likes":null}},"distribution":{"claim_url":"https://unfragile.ai/submit?claim=fewsats","compare_url":"https://unfragile.ai/compare?artifact=fewsats"}},"signature":"c9UheE+uCVqCDP4WDxUUFju2Io7P/ljCsViV9hIAGH5/NGyuR6l3K/MTjONivkwThU14ATbCa9PnK9WadPVJCw==","signedAt":"2026-06-21T16:02:59.363Z","signedBy":"unfragile.ai","version":1},"_links":{"self":"https://unfragile.ai/api/v1/passport/fewsats","artifact":"https://unfragile.ai/fewsats","verify":"https://unfragile.ai/api/v1/verify?slug=fewsats","publicKey":"https://unfragile.ai/api/v1/trust-passport-public-key","spec":"https://unfragile.ai/trust","schema":"https://unfragile.ai/schema.json","docs":"https://unfragile.ai/docs"}}