Onchain & crypto

Count the LLM tokens in text for a given model or encoding — exact for OpenAI and open models (Llama, Mistral, Qwen, Gemma, DeepSeek, Command-R); labelled-approximate for Claude & Gemini.

Mint a signed JSON Web Token from a JSON claims object, using a shared secret (HS*) or a PEM private key (RS/ES/PS). Supports expiresInSec, notBeforeSec, issuer, audience, subject and keyid. An unusable key or option is rejected before payment.

Comprehensive token verification report, token metadata, and risk signals powered by WachAI for EVM and Solana assets. After your call, please rate this service for other agents: GET /feedback/rate?feedback_id=FEEDBACK_ID&outcome=fully (or partially, no), using the feedback_id from the response. Free, one request. If it wasn't fully, please also add &issue= with wrong_output, unmet_expectation, schema_mismatch, slow, unclear_docs or too_expensive, so the merchant knows what to fix.

Risk scan for one Solana SPL token. Call it before buying, listing, accepting or recommending a token you have not vetted. Checks mint and freeze authority, holder concentration, liquidity and wash volume; pro also traces holder wallets for bot farms, shared funders and launch snipers. Returns NO_FLAGS, WATCH or RISKY with an AI summary. basic $0.02, pro $0.05. Scans that fail or have bad input are not charged.

Solana swap triage for AI agents. Returns a Safe / Protect / Refuse verdict for a proposed swap: token risk screening, sandwich-attack exposure, and the priority fee and Jito tip to use. Call it before signing a swap. Advisory only: builds no transaction and never handles keys. Pay in USDC; network fees are sponsored. Full contract: GET /v1/agent. Terms: https://zendiq.ai/agents/terms/

Exchange listing and delisting announcements from Binance and OKX in the last 30 days, new Coinbase trading pairs detected the moment they appear (and pairs that go offline), and the most-voted active DAO governance proposals on Snapshot. Refreshed every 15 minutes. Rebuilt every 15 minutes. $0.02 per call, no account. Free 24h-delayed sample: GET https://ioswarm.io/api/v1/feeds/crypto-listings/sample.

+15 more from ioswarm.io

Settlement Proof — chain_id=8453/tx_hash=0x381b311efe17fdce7e3e26d211253197bfb715195152b016b9576b6528989684

Which x402 services actually deliver — every one paid-tested with real USDC, receipts on-chain.

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.

Is this crypto entity MiCA-authorised in the EU/EEA, in which register, with what status? Query params: name (string) OR lei (20-character LEI). JSON: match_confidence (exact|strong|weak|none), authorised (boolean), flagged_noncompliant (boolean), matches[] with register, legal_name, lei, home_member_state, competent_authority, status, services[], authorisation_date. Data source: ESMA Interim MiCA Register, official EU data; refreshed daily from weekly ESMA publications.

Watch a whole list at once, when a bibliography or a dependency manifest has to stay true: up to 25 citations or package versions re-checked every day for 30 days under one token. US$5 a portfolio — 20 cents a reference, under a cent a check. Every reference is answered and signed on purchase, and each real change gets its own signed receipt. Nothing is sent when nothing changed. Pay per call here, or redeem a prepaid pack code (100 credits).

+1 more from factstamp.agentrails.workers.dev

Create a custom email mailbox at @clawmail.xyz for AI agents and LLMs

Grade a wallet's chain footprint, longevity and sampled tx intensity A-F across EVM networks. POST wallet_address; signed certificate. $0.05 USDC.

Toolstem SEC EDGAR Signal Intelligence MCP — filings, insider transactions, 8-K severity scoring. Per-tool tiered pricing ($0.005–$0.50).

Roll dice notation with a cryptographically secure RNG, optionally repeated. Returns per-die rolls, the kept dice and the total for each roll.

Decode a JSON Web Token WITHOUT verifying its signature and return the header, payload and signature. A structurally malformed token is rejected before payment. Never trust a decoded payload you have not verified.

Generate a random string of a given length from a named charset (alphanumeric, alpha, lower, upper, numeric, hex, base58) or a custom alphabet. Unbiased character selection.

Fletcher checksum over the input payload, in 16-bit (default) or 32-bit width. Returns the checksum as an unsigned integer and hex. Non-cryptographic.

CRC-32 (IEEE 802.3 polynomial, as used by zip, gzip and PNG) over the input payload. Returns the checksum as an unsigned integer and 8-digit hex. Non-cryptographic — for error detection only.

Adler-32 checksum (as used by zlib) over the input payload. Faster than CRC-32 but weaker for short inputs. Returns the checksum as an unsigned integer and 8-digit hex. Non-cryptographic.

Simulates an unsigned Base or Base Sepolia EVM transaction with read-only RPC calls before an agent signs or broadcasts it. Returns execution/revert status, gas estimate, decoded top-level ERC-20 transfers and approvals, unlimited-approval warnings, and a risk signal. It never signs, holds keys, or broadcasts. Standard RPC does not expose complete internal/token state diffs.

Deep view: top 100 x402 services tagged 'evidence': ranked by 30-day unique paying wallets, with calls, price, network and calls-per-payer for each. 553 providers and 574 paying wallets measured in this tag.

+23 more from x402-bazaar-rank.x402-bazaar-rank-worker.workers.dev

Swap quote

+2 more from api.arcgate.dev

Independently verify authorization, settlement, delivery and deterministic acceptance; return a signed portable assurance receipt

The check before the riskiest moment — signing. Decodes raw unsigned calldata (approve / permit / transfer / setApprovalForAll), shows the exact intent (who gets power over what, and whether it's UNLIMITED), and screens the destination + spender for OFAC sanctions and dangerous owner powers, in one GO/HOLD/STOP verdict + receipt. No simulation needed — pure decode + onchain risk. Catches the unlimited-approval drain vector before it's signed.

🆕 The complete fund-movement authority on a Base wallet in one call: ERC-20 approvals (a spender you approved can pull the token) PLUS Base Account spend permissions (the agent-era scoped recurring allowance) — one drain-surface verdict with the ERC-20 revoke queue to act on. Approval tools miss the spend permissions; spend-permission tools miss the approvals. The only combined check for agent wallets that must know their whole exposure before holding funds.

Withdraw agent ETH balance to USDC (mutates: gas + swap)

+1 more from flipr-x402.fly.dev

Make any signed Base transaction conditional (Cobalt validity tx): Base includes it only while your conditions hold. We validate the predicates and return the base_sendRawTransactionValidity request; we never touch funds or keys. Every request carries the deadline Base requires (at most 60 s out; set for you if omitted). Optional conditions: fromBlock, flashblockIndex (1-10), minNativeBalanceWei, or a storage predicate for price.

Findings brief for data and API sellers: how AI agents with funded wallets behave at a paywall. 1,416 purchases and refusals across six models and three agent frameworks on x402, with the install checklist. Full text, markdown, September 2026.