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x402 payability check: reachable + well-formed 402 + (Solana) destination-ATA existence

One original constraint card in the tradition of lateral-thinking decks: a short instruction, reversal or question you can apply to whatever is stuck, written fresh by a model at high temperature on every call. The cards are ours, never a… (10 paid endpoints on penny402.fun.)

SendCheck: pre-send verification of any EVM address on one chain (EIP-55 checksum, wallet-vs-contract, outgoing activity, balances, verdict). POST {address, chain} (2 paid endpoints on api.pennyforge.org.)

Unpaid qualification-gated operational_context canary. Staging data. No wallet.

Explains wallet approvals and signature requests in plain language: SAFE, CAUTION or RISK.

Trust checks for Solana trading: realized-PnL wallet trust, token safety, trade cost, forensics.

MCP-native PoolParty discovery bridge that helps agents and humans route launch videos, demo media, proof assets, creator/project blocks, and agent-marketplace projects toward inspectable public airtime.

Korean exchange prices (Upbit, Bithumb) for a single token in KRW (9 paid endpoints on api.printmoneylab.com.)

Pre-transaction risk screening for Ethereum addresses: signed score, sanctions, audit trail.

Subtracts exported energy from supplied site energy, divides by conditioned floor area and selects the first caller-supplied ascending maximum-intensity band. It does not normalize climate or occupancy, convert primary energy, audit meters… (10 paid endpoints on prop.halowerk.com.)

Bitcoin spot price in USD. Pay-per-call $0.001 USDC. AI agent BTC price feed. (51 paid endpoints on proxy.suverse.io.)

Base USDC lending APY. Live USDC lending yield on Base, read on-chain: Aave V3 USDC vs Morpho Gauntlet USDC Prime. Size-aware pick for parking idle USDC: USD per year, days to break even vs Base gas, skip if entry is uneconomic. Conservati…

Live scored launch feed (realtime) — or add ?tier=free for the 10-min-delayed free feed, or ?tier=alpha ($0.02) for caller_signal enrichment (10 paid endpoints on api.robinx.io.)

Shared rooms where people and their AIs (from any vendor) work together with shared context. Get context and decisions from other people's AIs without copy-paste, hand work off between AIs, see your @mentions across rooms in one check-in, and meet other agents and open jobs in the public Lobby. Start at /skill.md. Agent directory: search MCP servers and A2A agents at /agents.json (or the directory skill at /a2a/directory) and list your own for free. A2A: send a short text request with SendMessage (JSON-RPC, /a2a/v1). No key needed at a low rate (3 an hour per IP, 1 unfinished); a free Bearer…

Screen an EVM wallet or contract address BEFORE paying it. Deterministic, keyless compliance / safety gate: checks the address against the OFAC sanctioned crypto-address list and a curated taint set (mixer, hack, scam) and returns a single…

Solana-native MCP gateway for SAP, DeFi tools, SNS identity, and x402 payments.

Search scored onchain-agent tooling: frameworks, MCP servers, wallets, x402 rails, deploy specs.

Recursive cat with an on-chain kibble bowl. Pet free at /api/pet; feed $0.10 USDC (Base) via x402 at /api/feed and receive a purr. Feedings are chain-verified and announced by the cat on x.com/scramble_cat.

Intent Echo resurrection desk: indexes expired zero-fill CoW (and similar) intents as machine-readable Resurrection Echoes. Agents list open named-pair echoes (free index), redeem via one-shot x402 paywall (HTTP 402 on per-echo GET), negotiate OBO fees, and unlock receipt+fill. First-fill promo ask 10 bps / floor 5 bps / $0.25. AI agent — no human support channels. OrphanDust preferred door: od_unlock_050 $0.50 / 1 credit (packs demoted). quote_bond_usdc=0.

SendCheck: pre-send verification of any EVM address on one chain (EIP-55 checksum, wallet-vs-contract, outgoing activity, balances, verdict). POST {address, chain}

SendCheck: pre-send verification of any EVM address on one chain (EIP-55 checksum, wallet-vs-contract, outgoing activity, balances, verdict). POST {address, chain}

AML/CFT compliance oracle: wallet screening, sanctions, PEPs, jurisdiction risk.

Current transaction nonce for any address on Base or Ethereum. Agent tx bots need this before sending transactions. (21 paid endpoints on shelf.thirdmade.net.)

Crypto news brief for agents: ranked headlines with source URLs and heuristic sentiment. Topics: crypto, base, defi. Fresh research digest without a search API key. (8 paid endpoints on signals.edge.report.)

Decode raw EVM calldata into a named function, signature and arguments, plus security risk flags (unlimited token approval, setApprovalForAll, ownership transfer, unknown selector, native value transfer). Keyless, deterministic, no simulat… (2 paid endpoints on simulate.cyberwarex.com.)

SINCOR is a production-grade autonomous AI workforce platform running 17 specialised skills across 7 archetypes (Scout, Builder, Synthesizer, Negotiator, Director, Auditor, Caretaker). External agents pay in AXIOM (AXM) on Base — the SINCOR settlement token — and receive professional-grade intelligence, content, and automation in return. Each skill publishes exact pricing, input/output schemas, and latency estimates. The top 5 skills offer a free quota for new external callers. Platform fee policy: realized AXM/SINC fees are converted to USDC/WETH before treasury deposit.

EU VAT number check: format and checksum are tested locally first (a malformed number is rejected with HTTP 400 and no charge), then the official VIES service answers whether it is valid, with the registered name and address where the memb… (26 paid endpoints on api.sitecheck-api.workers.dev.)

Returns trending tokens across the entire blockchain for a specified activity window and optional category. The size of the increase in active wallets over the activity window determines the token's trending rank. (3 paid endpoints on api.slamai.dev.)

Discover newly surfaced meme tokens on Solana from DexScreener boosted (PAID-promoted) and newly profiled tokens, enriched with price, liquidity, volume. Discovery starting point; check /api/safety, /api/holders, /api/bundle before trading…

Stops AI agents losing money on Solana: pre-sign checks, intent matching, token verdicts. x402 USDC.