topics: developer tools · apis & integration
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- vibesprings Vibe Springs: pay-per-use data & intelligence APIs for agents (weather, FX, crypto, on-chain intel, watches, x402 merchant analytics). Free tools: health, search_services, get_delay_risk_demo is the cheapest paid demo ($0.002). Paid tools use x402 on Base: call once without payment_signature to get… 25 skills · free · checked 20m ago 10
- affiliate-router-menu Paid search API over a registry of x402 services, with filters for category, tag, health status and reputation score. [not the operator's words] 1 skill · free · checked 6m ago· also A2A 10
- fresh-feeds Free tools (search_mcp_registry, get_registry_highlights, verify_mcp_server, list_x402_services, feeds_status, assess_agent_risk) return data directly. Tools named get_*_snapshot / get_registry_changes / verify_mcp_server_report return x402 payment instructions for the full paid data (no account; US… 10 skills · free · checked 44m ago· also A2A 10
- vaaya Vaaya helps you find what you need and get it done: research, create, run code, and buy from supported stores. Search, scrape and crawl the web; compare products and travel; generate or edit IMAGES, VIDEO and AUDIO; parse documents; run code in sandboxes; automate browsers; enrich leads; send email… 13 skills · needs a key · checked 20m ago 10
- agentbit Every tool is pay-per-call over the x402 protocol (USDC on Base, no signup). Call a tool without _payment to receive the exact payment requirements; sign an EIP-3009 authorization (see the requirements' extra.name/version) and retry with _payment set to the base64 PAYMENT-SIGNATURE payload. Docs: ht… 93 skills · free · checked 36m ago 10
- nohumans-directory nohumans.directory is a registry of paid (x402-enabled) APIs and datasets with automated verification and reputation scoring. Use find_paid_service to discover services worth paying for, and get_service_details before actually calling one. Trust signals: status 'verified' means the endpoint has sust… 4 skills · free · checked 12m ago· also A2A 10
- apiacre Use the free recommendation resource template to select a service by task, read its free full purchase-handoff resource, inspect its free static sample, and read the free workflow catalog before composing multi-call plans. Read the free Pixel Acre inventory resource before considering an advertising… 73 skills · unprobed · checked 16m ago· also A2A 10
- x402-bazaar-rank Ranked discovery over the live x402 service market, scored by real 30-day unique payers and call volume. A free weekly report on market changes is at https://x402-bazaar-rank.x402-bazaar-rank-worker.workers.dev/join. 2 skills · free · checked 6m ago 10
- otto-x402-open-router An agent would call this router to discover the best-matched Otto and x402 services for a data need and to rate paid calls for refunds. [not the operator's words] 2 skills · unprobed · checked 26m ago 10
- x402-endpoints Paid tools wrapping official real-world APIs and crypto pre-trade data, billed per call via the x402 protocol (USDC on Base mainnet). Each tool's description states its price. With a funded Base wallet configured, calls return live data automatically; otherwise they return the exact payment terms so… 52 skills · free · checked 4m ago· also A2A 10
- relaystation Relaystation — one prepaid balance + one API key for agent infrastructure. Find tools: `search_tools`; get a schema: `describe_tool`; run a non-hot tool by name: `call_tool` (hot tools call directly). Full roster at https://api.relaystation.ai/mcp/full. Capabilities by family: • Storage (Baton): cre… 14 skills · unprobed · checked 42m ago 10
- x402-checker Disclosed AI named Nock. Contact [email protected]. Free tools: check, board, name_lookup. Paid tools: bid $0.05, name_register $0.05, report $0.05, who/md/headers/json/sanctions/domain/ssl/ens/redirect/gas/price/tx/block/token/sig/pm/fng/tsec/dex/now/find/geo/fx/wx/quote/hn/arxiv/so/cve/gh/wik… 43 skills · paid · checked 10m ago· also A2A 0
- cracked-public This is the public Cracked server: discover_tools and inspect_tool are free with no account. Your first call is your signup: run_tool or run_capability with no key creates a workspace for you with $2 of trial credit, runs the request and returns onboarding.key once; store it as CRACKED_API_KEY and c… 8 skills · free · checked 38m ago· also A2A 0
- SCRIPTMASTERLABS — SqueezeOS Resolve current product inventory with tools/list plus live capability discovery. Use agent_web_access for one-shot public HTTPS URL-to-Markdown access. Paid REST capabilities use canonical x402 v2 challenges; an unsigned 402 is PAYMENT_REQUIRED, not unavailable, and MCP never spends automatically. 15 skills · free · checked 1h ago· also A2A 0
- 402Signal Fail-closed live-endpoint x402 router. POST /route, $0.01 USDC on Base, Solana, Algorand. [not the operator's words] 3 skills · paid · checked 1h ago 0
- agentbodega-mcp Use this server to discover AgentBodega offerings, inspect accepted inputs and examples, and generate HTTP/x402 call snippets. Do not use it to execute paid calls directly. 4 skills · free · checked 1h ago· also A2A 0
- x402-micro-tollgate Pay-per-call gateway that fetches web pages as Markdown and forwards requests to an upstream API, with a mock mode for testing. 4 skills · unprobed · checked 28m ago· also A2A 0
- kortex Kortex tells an agent which x402 service actually works, from evidence: uptime measured over time, a valid 402, and settlements proven on-chain. Start by calling capabilities. If you do not have a token yet, call identity_create with your wallet address and an EIP-191 signature; it is free. Before… 10 skills · needs a key · checked 42m ago· also A2A 0
- agentresolver AgentResolver is an open-world capability procurement and verification service. When the agent's installed tools do not clearly satisfy the task, do not stop after tools/list: call `procure` first. Procure is free and fail-closed; it will not select an external capability whose required evidence is… 35 skills · unprobed · checked 19m ago· also A2A 0
- clankerceo-x402 Measured x402 ecosystem data, facilitator reliability, and live endpoint checks. [not the operator's words] 6 skills · free · checked 6m ago 0
- oromi-agent-services QUOTE-ONLY hosted endpoint: this server holds no wallet and cannot execute paid calls. Paid tools return the exact price, network and payTo plus how to pay (x402, USDC on Base). The free tools (oromi_catalog, oromi_feedback, human_result) are fully functional. For automatic per-call payment, run the… 30 skills · free · checked 34m ago 0
- Atinamos Agent Shop Discover machine services available from the Atinamos Agent Shop. Service definitions, prices, payment requirements and input schemas come from the live Atinamos service catalogue. 5 skills · free · checked 3m ago 0
- mcp-x402 SCRIPTMASTERLABS x402 Gateway: read-only discovery of x402 paid APIs and fresh payment requirements on Base. Caller controls authorization and spending. [not the operator's words] 3 skills · free · checked 16m ago· also A2A 0
- OnchainExpat x402 APIs You have access to tools that describe OnchainExpat's x402 paid API endpoints. These tools provide endpoint details, parameters, and pricing. To actually call an endpoint, make an HTTP POST to the URL with an x402 payment header. Payment is in USDC on Base or Solana. See https://x402.onchainexpat.co… 48 skills · free · checked 40m ago· also A2A 0
- statepulse-api statepulse-api exposes lookupBarcode, trackAirspace, getAirQuality, the capability an agent calls it for [not the operator's words] 56 skills · unprobed · checked 1h ago 0
- x402-trust Provides MCP tools including x402_trust_score, x402_trust_leaderboard, x402_trust_preview to query external data and execute blockchain-related operations for autonomous agents. [not the operator's words] 13 skills · free · checked 16m ago 0
- x402-trust Score up to 10 x402 endpoints in a single paid call. Each found result carries the FULL trust report — identical to POST /v1/x402-trust: score, grade, scoreRange, recommendation, confidence breakdown, the component/subscore breakdown, explanations, flags + flagsDetailed, advertised price, and 30-day on-chain stats — not just the scalar verdict. [not the operator's words] 13 skills · free · checked 16m ago 0
- ausca Use search and get to resolve an immutable offer before acting. The public MCP transport does not accept wallets or payment credentials and omits disabled paid-invocation tools. Follow the selected service SKILL.md and use the canonical HTTP invocation resource for paid execution. Browser and inbox… 14 skills · free · checked 3m ago 0
- ontario-protocol Ontario Protocol: x402 discovery and pre-payment verification for agent commerce. The default catalog supports buyers and endpoint providers: route, find, verify, decide, build a provider launch payload for free, or publish a service profile only when ontario_purchase_router returns paid_recommended… 21 skills · free · checked 48m ago 0
- Toolsmith Toolcall exposes 30 pay-per-call APIs for agents (compliance, trade, safety, web and data). Each tool costs a few cents in USDC on Base via the x402 protocol; the calling client pays automatically when it supports x402. Call a tool with no payment to receive the exact price and payment requirements. 20 skills · unprobed · checked 12m ago 0
- Toolsmith Toolcall exposes 30 pay-per-call APIs for agents (compliance, trade, safety, web and data). Each tool costs a few cents in USDC on Base via the x402 protocol; the calling client pays automatically when it supports x402. Call a tool with no payment to receive the exact price and payment requirements. 20 skills · unprobed · checked 44m ago 0
- polyform Machine-payable data endpoints. tools/list, prompts and resources are free; tools/call requires a USDC payment on Base via x402 — an unpaid call returns HTTP 402, pay and retry with the X-PAYMENT header. 67 skills · unprobed · checked 32m ago· also A2A 0
- gadgethumans-mcp GadgetHumans API Hub — 49 MCP tools + 300+ REST tools via call_api. Free tier: 100 requests/day. Use tools/list to see available tools. 46 skills · unprobed · checked 14m ago· also A2A 0
- deus-x402-catalog Every paid HTTP resource of the DEUS portfolio as a tool, priced in USDC on Base via x402 (no account, no API key). Call a tool without "payment" to read its price, sign the x402 payment, and call again with it. 9 skills · unprobed · checked 54m ago 0
- polyform Machine-payable data endpoints. tools/list, prompts and resources are free; tools/call requires a USDC payment on Base via x402 — an unpaid call returns HTTP 402, pay and retry with the X-PAYMENT header. 67 skills · unprobed · checked 48m ago· also A2A 0
- 2s.io Hosted 2s.io MCP — pay-per-call data + watchers, settled in USDC on Base via x402. Configure header `X-EVM-Private-Key: 0x…` (an EVM key funded with USDC on Base) so the server can sign each call. ⚠️ Your key transits 2s infrastructure here; for keys that never leave your machine, use the SDK / `npx… 574 skills · needs a key · checked 4m ago· also A2A 0
- riley-x402-agent-store Pay-per-call data tools. store_catalog is free. Paid tools cost $0.001-$19.00 per call settled in USDC on Base via the x402 protocol: an unpaid call returns the exact payment requirements; settle and retry with the signed payment payload in the x_payment argument. No API keys, no accounts. 92 skills · unprobed · checked 54m ago· also A2A 0
- riley-x402-agent-store Pay-per-call data tools. store_catalog is free. Paid tools cost $0.001-$19.00 per call settled in USDC on Base via the x402 protocol: an unpaid call returns the exact payment requirements; settle and retry with the signed payment payload in the x_payment argument. No API keys, no accounts. 92 skills · unprobed · checked 1h ago· also A2A 0
- gate402 Pay-per-call data and web tools for agents, settled in USDC over x402. No signup: POST /v1/free-key returns a key with free credit, then send it as X-API-Key. 8 skills · unprobed · checked 4m ago· also A2A 0
- agentpay AgentPay exposes pay-per-call AI microservices settled in USDC on Base mainnet via the x402 (HTTP 402) protocol. Each tool maps to one HTTP endpoint. Tools list their price in USD; payment is handled automatically when this server holds a funded wallet, otherwise the tool returns the payment challen… 28 skills · unprobed · checked 22m ago 0