codex

Colosseum Codex: Pay.sh, Crucible, Digital Asset Accounts

Pay.sh, Crucible Fuzzing Framework, Privy Digital Asset Accounts, Financial Institution's Guide to Solana

Here's what's featured in this week's issue:

Solana Foundation Launches Pay.sh
Asymmetric Research ships Crucible Invariant Fuzzing Framework
Privy and MAJORITY bring digital asset accounts to Solana
Solana Research publishes a Financial Institution's Guide to Solana

🤖 Pay.sh

Solana Foundation launched Pay.sh in collaboration with Google Cloud, letting AI agents discover, access, and pay-per-request for APIs using stablecoins on Solana with no sign-up or accounts required.

The platform ships as a CLI that works with curl, fetch, wget, and agent frameworks, plus an MCP server for compatible LLM clients including Gemini, Claude Code, Codex, Openclaw, and Hermes.

Agents discover endpoints through a machine-readable registry of 72+ providers spanning compute, finance, messaging, AI/ML, and data enrichment, with per-call pricing ranging from $0.001 to $10.

The Google Cloud integration exposes Gemini, BigQuery, and Vertex AI alongside community providers like Quicknode, Crossmint, Agentcash, Corbits, and MoonPay. Enterprises can also turn private BigQuery datasets or Cloud Run apps into agent-payable APIs through the x402 protocol, where the facilitator handles payment so data stays secure.

Pay.sh sits between agents and providers as a gateway, treating every provider response as untrusted so a bad endpoint can't compromise the agent.

Solana Foundation Launches Pay.sh in Collaboration with Google Cloud

🧪 Crucible Fuzzing Framework

Asymmetric Research released Crucible, a coverage-guided fuzzing framework for Solana programs that explores long instruction sequences to catch bugs unit and integration tests miss. It works on any program with a standard IDL, with Anchor and Anchor v2 supported from day one.

Under the hood, Crucible uses LiteSVM's register-level tracing for sBPF edge coverage with no program instrumentation required, plus a custom mutator that targets action sequences and typed parameters rather than raw byte, roughly 5x more effective at finding bugs than the standard arbitrary crate. In stateful mode it runs 67,000 executions per second across 12 cores.

Developers write a harness, tag actions with #[fuzz_fixture], and add invariants like fuzz_assert!(delegation.stake <= lamports). The fuzzer figures out how to break them.

Introducing Crucible: An Invariant Fuzzing Framework for Solana

💳 Digital Asset Accounts

At Solana Accelerate, Privy and MAJORITY launched digital asset accounts on Solana, a single primitive that bundles wallets, custody, payments, cards, and yield behind one API instead of making developers stitch those pieces together themselves.

MAJORITY, a cross-border banking app for immigrants, is the first to ship on it. It has 1M+ users, has sent over $1B to Latin America, and is using digital asset accounts to expand into Mexico and Colombia. Users don't see Solana, stablecoins, or wallets. They just get a faster, cheaper bank.

For builders, this means skipping the integration tax of wiring up KYC, custody, on/off ramps, card issuing, and payment rails one by one. Privy hides the chain plumbing; you build the product on top. The shape fits remittance apps, freelance marketplaces, travel and expense apps, neobanks, B2B payments tools, and any product that needs to move money across borders.

Privy and MAJORITY bring digital asset accounts to Solana

📑 A Financial Institution's Guide to Solana

The Solana Research Institute published a seven-chapter report covering protocol, economics, governance, ecosystem, regulation, and live product.

It's written for FI analysts, but the data points are the same ones builders need when pitching enterprise integrations or sizing the addressable market for their apps.

The headline numbers:

Solana processed 33 billion transactions in 2025 against Ethereum's 524 million
Realized throughput of 1,055 TPS
March 2026 median fee of $0.00048
Stablecoins on Solana circulate 4.5x faster than on Ethereum

The report also names what still poses risks like no designated settlement layer, the 10/10/2025 deleveraging cascade, and the limits of bridging for RWAs.

A Financial Institution's Guide to Solana

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⚡ Quick Hits

From Bounties and Hackathons to Full-Time Offers: The Solana Playbook - @EveyNFT

Introducing Aquarium: The liquidity engine for Solana - @humidifi

Why We’re Building JTX - @jito_sol

Why Trepa Occupies a Space No Other Prediction Market Can - @Baheet_

Western Union's USDPT is live on Solana - @solana

sBPF Assembly Explained - From Zero to Hello World (video) - Perelyn

⚙️ Tools & Resources

svm-unit-test is a Rust crate that runs functions tagged #[svm_unit_test] as compiled SBPF programs inside Mollusk and reports their compute-unit usage, removing the need to write standalone example programs to benchmark or unit-test SVM libraries.

💸 Funding

MoonPay acquired DFlow in a $100M all-stock deal, adding the Solana trading aggregator that powers Coinbase, Phantom, Solflare, and Kamino. For DFlow, the deal offers MoonPay's global distribution, licensing footprint, and capital.

Exponent raised $5M in a seed round led by Multicoin Capital, and ecosystem partners including Anatoly Yakovenko and angels from companies such as Squads, Jupiter, Anza, Sphere, and more. This raise will help the v2 launch of its Solana yield exchange with an onchain interest rate order book and strategy vaults, and to put roughly $1M toward audits and a bug bounty.

💀 RIP

Amp Pay is shutting down. The app stays available through at least the end of 2026 so users can send funds out or export their wallets, and pre-ordered card payments will be refunded to Amp wallets over the next two weeks.

Carrot is winding down following fallout from the Drift exploit. Users have until May 14, 2026 to withdraw from Boost, Turbo, and CRT, after which all leverage will be reduced to zero so the remaining liquidity goes toward CRT redemption. Any future Drift recovery proceeds will still be distributed to affected users.

👩‍🔧 Get Hired

Orca is hiring a Head of Product
Sphere is hiring a Senior Software Engineer (Customer Success)
MagicBlock is hiring a Marketing Lead

🎧 Listen to This

Validated

In this episode, Austin chats with Emmett Hollyer about the evolution and future of Solana Mobile. They reflect on how the successes and missteps of the Saga phone informed the more refined Seeker, with a focus on improvements in design, pricing, and usability.

Emmett discusses scaling production to meet over 100,000 preorders, strategies for attracting developers, and the rationale behind launching a token to align incentives across the ecosystem.

The conversation also explores plans to expand beyond in-house devices through partnerships with Android manufacturers, positioning Solana Mobile as a broader crypto platform rather than just a hardware company.

Solana Mobile's Vision Beyond Seeker with Emmett Hollyer

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